//*****************************************************************************
//
// Initializes the uDMA software channel to perform a memory to memory uDMA
// transfer.
//
//*****************************************************************************
void
InitSWTransfer(void)
{
unsigned int uIdx;
//
// Fill the source memory buffer with a simple incrementing pattern.
//
for(uIdx = 0; uIdx < MEM_BUFFER_SIZE; uIdx++)
{
g_ulSrcBuf[uIdx] = uIdx;
}
//
// Enable interrupts from the uDMA software channel.
//
ROM_IntEnable(INT_UDMA);
//
// Put the attributes in a known state for the uDMA software channel.
// These should already be disabled by default.
//
ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_SW,
UDMA_ATTR_USEBURST | UDMA_ATTR_ALTSELECT |
(UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK));
//
// Configure the control parameters for the SW channel. The SW channel
// will be used to transfer between two memory buffers, 32 bits at a time.
// Therefore the data size is 32 bits, and the address increment is 32 bits
// for both source and destination. The arbitration size will be set to 8,
// which causes the uDMA controller to rearbitrate after 8 items are
// transferred. This keeps this channel from hogging the uDMA controller
// once the transfer is started, and allows other channels cycles if they
// are higher priority.
//
ROM_uDMAChannelControlSet(UDMA_CHANNEL_SW | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 | UDMA_DST_INC_32 |
UDMA_ARB_8);
//
// Set up the transfer parameters for the software channel. This will
// configure the transfer buffers and the transfer size. Auto mode must be
// used for software transfers.
//
ROM_uDMAChannelTransferSet(UDMA_CHANNEL_SW | UDMA_PRI_SELECT,
UDMA_MODE_AUTO, g_ulSrcBuf, g_ulDstBuf,
MEM_BUFFER_SIZE);
//
// Now the software channel is primed to start a transfer. The channel
// must be enabled. For software based transfers, a request must be
// issued. After this, the uDMA memory transfer begins.
//
ROM_uDMAChannelEnable(UDMA_CHANNEL_SW);
ROM_uDMAChannelRequest(UDMA_CHANNEL_SW);
}
void WIZ610Transfer(void)
{
ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_UART1TX,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelAttributeEnable(UDMA_CHANNEL_UART1TX, UDMA_ATTR_USEBURST);
ROM_uDMAChannelControlSet(UDMA_CHANNEL_UART1TX | UDMA_PRI_SELECT,
UDMA_SIZE_8 | UDMA_SRC_INC_8 | UDMA_DST_INC_NONE |
UDMA_ARB_4);
}
//*****************************************************************************
//
// This example application demonstrates the use of a periodic timer to
// request DMA transfers.
//
// Timer0 is used as the periodic timer that requests DMA transfers.
// Timer1 is a free running counter that is used as the source data for
// DMA transfers. The captured counter values from Timer1 are copied by
// uDMA into a buffer.
//
//*****************************************************************************
int
main(void)
{
unsigned long ulIdx;
unsigned long ulThisTimerVal;
unsigned long ulPrevTimerVal;
unsigned long ulTimerElapsed;
unsigned long ulTimerErr;
//
// Set the clocking to run directly from the crystal.
//
ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);
//
// Initialize the UART and write status.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
UARTStdioInit(0);
UARTprintf("\033[2JuDMA periodic timer example\n\n");
//
// Enable the timers used by this example.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);
//
// Enable the uDMA peripheral
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UDMA);
//
// Enable the uDMA controller error interrupt. This interrupt will occur
// if there is a bus error during a transfer.
//
ROM_IntEnable(INT_UDMAERR);
//
// Enable the uDMA controller.
//
ROM_uDMAEnable();
//
// Point at the control table to use for channel control structures.
//
ROM_uDMAControlBaseSet(ucControlTable);
//
// Enable processor interrupts.
//
ROM_IntMasterEnable();
//
// Configure one of the timers as free running 32-bit counter. Its
// value will be used as a time reference.
//
ROM_TimerConfigure(TIMER1_BASE, TIMER_CFG_PERIODIC);
ROM_TimerLoadSet(TIMER1_BASE, TIMER_A, ~0);
ROM_TimerEnable(TIMER1_BASE, TIMER_A);
//
// Configure the 32-bit periodic timer.
//
ROM_TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
ROM_TimerLoadSet(TIMER0_BASE, TIMER_A, TIMEOUT_VAL - 1);
//
// Enable the timer master interrupt. The timer interrupt will actually
// be generated by the uDMA controller when the timer channel transfer is
// complete. The interrupts on the timer (TimerIntEnable) do not need
// to be configured.
//
ROM_IntEnable(INT_TIMER0A);
//
// Put the attributes in a known state for the uDMA Timer0A channel. These
// should already be disabled by default.
//
ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_TMR0A,
UDMA_ATTR_ALTSELECT | UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
//
// Set up the DMA channel for Timer 0A. Set it up to transfer single
// 32-bit words at a time. The source is non-incrementing, the
// destination is incrementing.
//
ROM_uDMAChannelControlSet(UDMA_CHANNEL_TMR0A | UDMA_PRI_SELECT,
UDMA_SIZE_32 |
UDMA_SRC_INC_NONE | UDMA_DST_INC_32 |
UDMA_ARB_1);
//
// Set up the transfer for Timer 0A DMA channel. Basic mode is used,
// which means that one transfer will occur per timer request (timeout).
// The amount transferred per timeout is determined by the arbitration
// size (see function above). The source will be the value of free running
// Timer1, and the destination is a memory buffer. Thus, the value of the
// free running Timer1 will be stored in a buffer every time the periodic
// Timer0 times out.
//
ROM_uDMAChannelTransferSet(UDMA_CHANNEL_TMR0A | UDMA_PRI_SELECT,
UDMA_MODE_BASIC,
(void *)(TIMER1_BASE + TIMER_O_TAV),
g_ulTimerBuf, MAX_TIMER_EVENTS);
//
// Enable the timers and the DMA channel.
//
UARTprintf("Using timeout value of %u\n", TIMEOUT_VAL);
UARTprintf("Starting timer and uDMA\n");
TimerEnable(TIMER0_BASE, TIMER_A);
uDMAChannelEnable(UDMA_CHANNEL_TMR0A);
//
// Wait for the transfer to complete.
//
UARTprintf("Waiting for transfers to complete\n");
while(!g_bDoneFlag)
{
}
//
// Check for the expected number of occurrences of the interrupt handler,
// and that there are no DMA errors
//
if(g_uluDMAErrCount != 0)
{
UARTprintf("\nuDMA errors were detected!!!\n\n");
}
if(g_ulTimer0AIntCount != 1)
{
UARTprintf("\nUnexpected number of interrupts occurrred (%d)!!!\n\n",
g_ulTimer0AIntCount);
}
//
// Display the timer values that were transferred using timer triggered
// uDMA. Compare the difference between stored values to the timer
// period and make sure they match. This verifies that the periodic
// DMA transfers were occuring with the correct timing.
//
UARTprintf("\n Captured\n");
UARTprintf("Event Value Difference Status\n");
UARTprintf("----- ---------- ---------- ------\n");
for(ulIdx = 1; ulIdx < MAX_TIMER_EVENTS; ulIdx++)
{
//
// Compute the difference between adjacent captured values, and then
// compare that to the expected timeout period.
//
ulThisTimerVal = g_ulTimerBuf[ulIdx];
ulPrevTimerVal = g_ulTimerBuf[ulIdx - 1];
ulTimerElapsed = ulThisTimerVal > ulPrevTimerVal ?
ulThisTimerVal - ulPrevTimerVal :
ulPrevTimerVal - ulThisTimerVal;
ulTimerErr = ulTimerElapsed > TIMEOUT_VAL ?
ulTimerElapsed - TIMEOUT_VAL :
TIMEOUT_VAL - ulTimerElapsed;
//
// Print the captured value and the difference from the previous
//
UARTprintf(" %2u 0x%08X %8u ", ulIdx, ulThisTimerVal,
ulTimerElapsed);
//
// Print error status based on the deviation from expected difference
// between samples (calculated above). Allow for a difference of up
// to 1 cycle. Any more than that is considered an error.
//
if(ulTimerErr > 1)
{
UARTprintf(" ERROR\n");
}
else
{
UARTprintf(" OK\n");
}
}
//
// End of application
//
while(1)
{
}
}
//*****************************************************************************
//
// Perform an CCM decryption operation.
//
//*****************************************************************************
bool
AES128CCMDecrypt(uint32_t *pui32Key, uint32_t *pui32Src, uint32_t *pui32Dst,
uint32_t ui32DataLength, uint32_t *pui32Nonce,
uint32_t ui32NonceLength, uint32_t *pui32AuthData,
uint32_t ui32AuthDataLength, uint32_t *pui32Tag,
uint32_t ui32TagLength, bool bUseDMA)
{
uint32_t pui32IV[4], ui32Idx;
uint32_t ui32M, ui32L;
uint8_t *pui8Nonce, *pui8IV;
//
// Determine the value of M. It is determined using
// the tag length.
//
if(ui32TagLength == 4)
{
ui32M = AES_CFG_CCM_M_4;
}
else if(ui32TagLength == 6)
{
ui32M = AES_CFG_CCM_M_6;
}
else if(ui32TagLength == 8)
{
ui32M = AES_CFG_CCM_M_8;
}
else if(ui32TagLength == 10)
{
ui32M = AES_CFG_CCM_M_10;
}
else if(ui32TagLength == 12)
{
ui32M = AES_CFG_CCM_M_12;
}
else if(ui32TagLength == 14)
{
ui32M = AES_CFG_CCM_M_14;
}
else if(ui32TagLength == 16)
{
ui32M = AES_CFG_CCM_M_16;
}
else
{
UARTprintf("Unexpected tag length.\n");
return(false);
}
//
// Determine the value of L. This is determined by using
// the value of q from the NIST document: n + q = 15
//
if(ui32NonceLength == 7)
{
ui32L = AES_CFG_CCM_L_8;
}
else if(ui32NonceLength == 8)
{
ui32L = AES_CFG_CCM_L_7;
}
else if(ui32NonceLength == 9)
{
ui32L = AES_CFG_CCM_L_6;
}
else if(ui32NonceLength == 10)
{
ui32L = AES_CFG_CCM_L_5;
}
else if(ui32NonceLength == 11)
{
ui32L = AES_CFG_CCM_L_4;
}
else if(ui32NonceLength == 12)
{
ui32L = AES_CFG_CCM_L_3;
}
else if(ui32NonceLength == 13)
{
ui32L = AES_CFG_CCM_L_2;
}
else if(ui32NonceLength == 14)
{
ui32L = AES_CFG_CCM_L_1;
}
else
{
UARTprintf("Unexpected nonce length.\n");
return(false);
}
//
// Perform a soft reset.
//
ROM_AESReset(AES_BASE);
//
// Clear the interrupt flags.
//
g_bContextInIntFlag = false;
g_bDataInIntFlag = false;
g_bContextOutIntFlag = false;
g_bDataOutIntFlag = false;
g_bContextInDMADoneIntFlag = false;
g_bDataInDMADoneIntFlag = false;
g_bContextOutDMADoneIntFlag = false;
g_bDataOutDMADoneIntFlag = false;
//
// Enable all interrupts.
//
ROM_AESIntEnable(AES_BASE, (AES_INT_CONTEXT_IN | AES_INT_CONTEXT_OUT |
AES_INT_DATA_IN | AES_INT_DATA_OUT));
//
// Configure the AES module.
//
ROM_AESConfigSet(AES_BASE, (AES_CFG_KEY_SIZE_128BIT | AES_CFG_DIR_DECRYPT |
AES_CFG_CTR_WIDTH_128 |
AES_CFG_MODE_CCM | ui32L | ui32M));
//
// Determine the value to be written in the initial value registers. It is
// the concatenation of 5 bits of zero, 3 bits of L, nonce, and the counter
// value. First, clear the contents of the IV.
//
for(ui32Idx = 0; ui32Idx < 4; ui32Idx++)
{
pui32IV[ui32Idx] = 0;
}
//
// Now find the binary value of L.
//
if(ui32L == AES_CFG_CCM_L_8)
{
pui32IV[0] = 0x7;
}
else if(ui32L == AES_CFG_CCM_L_7)
{
pui32IV[0] = 0x6;
}
else if(ui32L == AES_CFG_CCM_L_6)
{
pui32IV[0] = 0x5;
}
else if(ui32L == AES_CFG_CCM_L_5)
{
pui32IV[0] = 0x4;
}
else if(ui32L == AES_CFG_CCM_L_4)
{
pui32IV[0] = 0x3;
}
else if(ui32L == AES_CFG_CCM_L_3)
{
pui32IV[0] = 0x2;
}
else if(ui32L == AES_CFG_CCM_L_2)
{
pui32IV[0] = 0x1;
}
//
// Finally copy the contents of the nonce into the IV. Convert
// the pointers to simplify the copying.
//
pui8Nonce = (uint8_t *)pui32Nonce;
pui8IV = (uint8_t *)pui32IV;
for(ui32Idx = 0; ui32Idx < ui32NonceLength; ui32Idx++)
{
pui8IV[ui32Idx + 1] = pui8Nonce[ui32Idx];
}
//
// Write the initial value.
//
ROM_AESIVSet(AES_BASE, pui32IV);
//
// Write the key.
//
ROM_AESKey1Set(AES_BASE, pui32Key, AES_CFG_KEY_SIZE_128BIT);
//
// Depending on the argument, perform the decryption
// with or without uDMA.
//
if(bUseDMA)
{
//
// Enable DMA interrupts.
//
ROM_AESIntEnable(AES_BASE, (AES_INT_DMA_CONTEXT_IN |
AES_INT_DMA_DATA_IN |
AES_INT_DMA_CONTEXT_OUT |
AES_INT_DMA_DATA_OUT));
//
// Setup the DMA module to copy auth data in.
//
ROM_uDMAChannelAssign(UDMA_CH14_AES0DIN);
ROM_uDMAChannelAttributeDisable(UDMA_CH14_AES0DIN,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH14_AES0DIN | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 |
UDMA_DST_INC_NONE | UDMA_ARB_4 |
UDMA_DST_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH14_AES0DIN | UDMA_PRI_SELECT,
UDMA_MODE_BASIC, (void *)pui32AuthData,
(void *)(AES_BASE + AES_O_DATA_IN_0),
LengthRoundUp(ui32AuthDataLength) / 4);
UARTprintf("Data in DMA request enabled.\n");
//
// Setup the DMA module to copy the data out.
//
ROM_uDMAChannelAssign(UDMA_CH15_AES0DOUT);
ROM_uDMAChannelAttributeDisable(UDMA_CH15_AES0DOUT,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH15_AES0DOUT | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_NONE |
UDMA_DST_INC_32 | UDMA_ARB_4 |
UDMA_SRC_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH15_AES0DOUT | UDMA_PRI_SELECT,
UDMA_MODE_BASIC,
(void *)(AES_BASE + AES_O_DATA_IN_0),
(void *)pui32Dst,
LengthRoundUp(ui32DataLength) / 4);
UARTprintf("Data out DMA request enabled.\n");
//
// Write the length registers.
//
ROM_AESLengthSet(AES_BASE, (uint64_t)ui32DataLength);
//
// Write the auth length registers to start the process.
//
ROM_AESAuthLengthSet(AES_BASE, ui32AuthDataLength);
//
// Enable the DMA channels to start the transfers. This must be done after
// writing the length to prevent data from copying before the context is
// truly ready.
//
ROM_uDMAChannelEnable(UDMA_CH14_AES0DIN);
ROM_uDMAChannelEnable(UDMA_CH15_AES0DOUT);
//
// Enable DMA requests.
//
ROM_AESDMAEnable(AES_BASE, AES_DMA_DATA_IN | AES_DMA_DATA_OUT);
//
// Wait for the data in DMA done interrupt.
//
while(!g_bDataInDMADoneIntFlag)
{
}
//
// Setup the uDMA to copy the plaintext data.
//
ROM_uDMAChannelAssign(UDMA_CH14_AES0DIN);
ROM_uDMAChannelAttributeDisable(UDMA_CH14_AES0DIN,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH14_AES0DIN | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 |
UDMA_DST_INC_NONE | UDMA_ARB_4 |
UDMA_DST_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH14_AES0DIN | UDMA_PRI_SELECT,
UDMA_MODE_BASIC, (void *)pui32Src,
(void *)(AES_BASE + AES_O_DATA_IN_0),
LengthRoundUp(ui32DataLength) / 4);
ROM_uDMAChannelEnable(UDMA_CH14_AES0DIN);
UARTprintf("Data in DMA request enabled.\n");
//
// Wait for the data out DMA done interrupt.
//
while(!g_bDataOutDMADoneIntFlag)
{
}
//
// Read the tag out.
//
ROM_AESTagRead(AES_BASE, pui32Tag);
}
else
{
//
// Perform the decryption.
//
ROM_AESDataProcessAuth(AES_BASE, pui32Src, pui32Dst, ui32DataLength,
pui32AuthData, ui32AuthDataLength, pui32Tag);
}
return(true);
}
void SSI3DMASlaveClass::configureDMA() {
//Enable uDMA
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UDMA);
ROM_SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_UDMA);
//Register DMA interrupt to handler
IntRegister(INT_UDMAERR, uDMAErrorHandler);
//Enable interrupt
ROM_IntEnable(INT_UDMAERR);
// Enable the uDMA controller.
ROM_uDMAEnable();
// Point at the control table to use for channel control structures.
ROM_uDMAControlBaseSet(pui8ControlTable);
//Assign DMA channels to SSI3
ROM_uDMAChannelAssign(UDMA_CH14_SSI3RX);
ROM_uDMAChannelAssign(UDMA_CH15_SSI3TX);
// Put the attributes in a known state for the uDMA SSI0RX channel. These
// should already be disabled by default.
ROM_uDMAChannelAttributeDisable(UDMA_CH14_SSI3RX, UDMA_ATTR_USEBURST | UDMA_ATTR_ALTSELECT |
(UDMA_ATTR_HIGH_PRIORITY | UDMA_ATTR_REQMASK));
// Configure the control parameters for the primary control structure for
// the SSIORX channel.
ROM_uDMAChannelControlSet(UDMA_CH14_SSI3RX | UDMA_PRI_SELECT,
UDMA_SIZE_8 | UDMA_SRC_INC_NONE | UDMA_DST_INC_8 |
UDMA_ARB_4);
//Enable DMA channel to write in the next buffer position
ROM_uDMAChannelTransferSet(UDMA_CH14_SSI3RX | UDMA_PRI_SELECT,
UDMA_MODE_BASIC,
(void *)(SSI3_BASE + SSI_O_DR),
g_ui8SSIRxBuf[g_ui8RxWriteIndex], sizeof(g_ui8SSIRxBuf[g_ui8RxWriteIndex]));
// Configure TX
//
// Put the attributes in a known state for the uDMA SSI0TX channel. These
// should already be disabled by default.
//
ROM_uDMAChannelAttributeDisable(UDMA_CH15_SSI3TX,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
// //
// // Configure the control parameters for the primary control structure for
// // the SSIORX channel.
// //
// ROM_uDMAChannelControlSet(UDMA_CH15_SSI3TX | UDMA_PRI_SELECT,
// UDMA_SIZE_8 | UDMA_SRC_INC_NONE | UDMA_DST_INC_NONE |
// UDMA_ARB_4);
//
// //Configure TX to always write 0xFF?
// g_ui8SSITxBuf[0] = 0xFF;
//
// //Enable DMA channel to write in the next buffer position
// ROM_uDMAChannelTransferSet(UDMA_CH15_SSI3TX | UDMA_PRI_SELECT,
// UDMA_MODE_BASIC, g_ui8SSITxBuf,
// (void *)(SSI3_BASE + SSI_O_DR),
// sizeof(g_ui8SSITxBuf));
ROM_uDMAChannelEnable(UDMA_CH14_SSI3RX);
// ROM_uDMAChannelEnable(UDMA_CH15_SSI3TX);
// //
// // Enable the SSI3 DMA TX/RX interrupts.
// //
// ROM_SSIIntEnable(SSI3_BASE, SSI_DMARX);
//
// //
// // Enable the SSI3 peripheral interrupts.
// //
// ROM_IntEnable(INT_SSI3);
}
//*****************************************************************************
//
// Initializes the UART0 peripheral and sets up the TX and RX uDMA channels.
// The UART is configured for loopback mode so that any data sent on TX will be
// received on RX. The uDMA channels are configured so that the TX channel
// will copy data from a buffer to the UART TX output. And the uDMA RX channel
// will receive any incoming data into a pair of buffers in ping-pong mode.
//
//*****************************************************************************
void
InitUART0Transfer(void)
{
unsigned int uIdx;
//
// Fill the TX buffer with a simple data pattern.
//
for(uIdx = 0; uIdx < UART_TXBUF_SIZE; uIdx++)
{
g_ucTxBuf[uIdx] = uIdx;
}
//
// Enable the UART peripheral, and configure it to operate even if the CPU
// is in sleep.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
ROM_SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_UART0);
//
// Configure the UART communication parameters.
//
ROM_UARTConfigSetExpClk(UART0_BASE, ROM_SysCtlClockGet(), 115200,
UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
UART_CONFIG_PAR_NONE);
//
// Set both the TX and RX trigger thresholds to 4. This will be used by
// the uDMA controller to signal when more data should be transferred. The
// uDMA TX and RX channels will be configured so that it can transfer 4
// bytes in a burst when the UART is ready to transfer more data.
//
ROM_UARTFIFOLevelSet(UART0_BASE, UART_FIFO_TX4_8, UART_FIFO_RX4_8);
//
// Enable the UART for operation, and enable the uDMA interface for both TX
// and RX channels.
//
ROM_UARTEnable(UART0_BASE);
ROM_UARTDMAEnable(UART0_BASE, UART_DMA_RX | UART_DMA_TX);
//
// This register write will set the UART to operate in loopback mode. Any
// data sent on the TX output will be received on the RX input.
//
HWREG(UART0_BASE + UART_O_CTL) |= UART_CTL_LBE;
//
// Enable the UART peripheral interrupts. Note that no UART interrupts
// were enabled, but the uDMA controller will cause an interrupt on the
// UART interrupt signal when a uDMA transfer is complete.
//
ROM_IntEnable(INT_UART0);
//
// Put the attributes in a known state for the uDMA UART0RX channel. These
// should already be disabled by default.
//
ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_UART0RX,
UDMA_ATTR_ALTSELECT | UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
//
// Configure the control parameters for the primary control structure for
// the UART RX channel. The primary contol structure is used for the "A"
// part of the ping-pong receive. The transfer data size is 8 bits, the
// source address does not increment since it will be reading from a
// register. The destination address increment is byte 8-bit bytes. The
// arbitration size is set to 4 to match the RX FIFO trigger threshold.
// The uDMA controller will use a 4 byte burst transfer if possible. This
// will be somewhat more effecient that single byte transfers.
//
ROM_uDMAChannelControlSet(UDMA_CHANNEL_UART0RX | UDMA_PRI_SELECT,
UDMA_SIZE_8 | UDMA_SRC_INC_NONE | UDMA_DST_INC_8 |
UDMA_ARB_4);
//
// Configure the control parameters for the alternate control structure for
// the UART RX channel. The alternate contol structure is used for the "B"
// part of the ping-pong receive. The configuration is identical to the
// primary/A control structure.
//
ROM_uDMAChannelControlSet(UDMA_CHANNEL_UART0RX | UDMA_ALT_SELECT,
UDMA_SIZE_8 | UDMA_SRC_INC_NONE | UDMA_DST_INC_8 |
UDMA_ARB_4);
//
// Set up the transfer parameters for the UART RX primary control
// structure. The mode is set to ping-pong, the transfer source is the
// UART data register, and the destination is the receive "A" buffer. The
// transfer size is set to match the size of the buffer.
//
ROM_uDMAChannelTransferSet(UDMA_CHANNEL_UART0RX | UDMA_PRI_SELECT,
UDMA_MODE_PINGPONG,
(void *)(UART0_BASE + UART_O_DR),
g_ucRxBufA, sizeof(g_ucRxBufA));
//
// Set up the transfer parameters for the UART RX alternate control
// structure. The mode is set to ping-pong, the transfer source is the
// UART data register, and the destination is the receive "B" buffer. The
// transfer size is set to match the size of the buffer.
//
ROM_uDMAChannelTransferSet(UDMA_CHANNEL_UART0RX | UDMA_ALT_SELECT,
UDMA_MODE_PINGPONG,
(void *)(UART0_BASE + UART_O_DR),
g_ucRxBufB, sizeof(g_ucRxBufB));
//
// Put the attributes in a known state for the uDMA UART0TX channel. These
// should already be disabled by default.
//
ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_UART0TX,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
//
// Set the USEBURST attribute for the uDMA UART TX channel. This will
// force the controller to always use a burst when transferring data from
// the TX buffer to the UART. This is somewhat more effecient bus usage
// than the default which allows single or burst transfers.
//
ROM_uDMAChannelAttributeEnable(UDMA_CHANNEL_UART0TX, UDMA_ATTR_USEBURST);
//
// Configure the control parameters for the UART TX. The uDMA UART TX
// channel is used to transfer a block of data from a buffer to the UART.
// The data size is 8 bits. The source address increment is 8-bit bytes
// since the data is coming from a buffer. The destination increment is
// none since the data is to be written to the UART data register. The
// arbitration size is set to 4, which matches the UART TX FIFO trigger
// threshold.
//
ROM_uDMAChannelControlSet(UDMA_CHANNEL_UART0TX | UDMA_PRI_SELECT,
UDMA_SIZE_8 | UDMA_SRC_INC_8 | UDMA_DST_INC_NONE |
UDMA_ARB_4);
//
// Set up the transfer parameters for the uDMA UART TX channel. This will
// configure the transfer source and destination and the transfer size.
// Basic mode is used because the peripheral is making the uDMA transfer
// request. The source is the TX buffer and the destination is the UART
// data register.
//
ROM_uDMAChannelTransferSet(UDMA_CHANNEL_UART0TX | UDMA_PRI_SELECT,
UDMA_MODE_BASIC, g_ucTxBuf,
(void *)(UART0_BASE + UART_O_DR),
sizeof(g_ucTxBuf));
//
// Now both the uDMA UART TX and RX channels are primed to start a
// transfer. As soon as the channels are enabled, the peripheral will
// issue a transfer request and the data transfers will begin.
//
ROM_uDMAChannelEnable(UDMA_CHANNEL_UART0RX);
ROM_uDMAChannelEnable(UDMA_CHANNEL_UART0TX);
}
//*****************************************************************************
//
// Perform an encryption operation.
//
//*****************************************************************************
bool
TDESCBCEncrypt(uint32_t *pui32Src, uint32_t *pui32Dst, uint32_t *pui32Key,
uint32_t ui32Length, uint32_t *pui32IV, bool bUseDMA)
{
//
// Perform a soft reset.
//
ROM_DESReset(DES_BASE);
//
// Clear the interrupt flags.
//
g_bContextInIntFlag = false;
g_bDataInIntFlag = false;
g_bDataOutIntFlag = false;
g_bContextInDMADoneIntFlag = false;
g_bDataInDMADoneIntFlag = false;
g_bDataOutDMADoneIntFlag = false;
//
// Enable all interrupts.
//
ROM_DESIntEnable(DES_BASE, (DES_INT_CONTEXT_IN |
DES_INT_DATA_IN | DES_INT_DATA_OUT));
//
// Configure the DES module.
//
ROM_DESConfigSet(DES_BASE, (DES_CFG_DIR_ENCRYPT | DES_CFG_TRIPLE |
DES_CFG_MODE_CBC));
//
// Write the key.
//
ROM_DESKeySet(DES_BASE, pui32Key);
//
// Write the IV.
//
ROM_DESIVSet(DES_BASE, pui32IV);
//
// Depending on the argument, perform the encryption
// with or without uDMA.
//
if(bUseDMA)
{
//
// Enable DMA interrupts.
//
ROM_DESIntEnable(DES_BASE, (DES_INT_DMA_CONTEXT_IN |
DES_INT_DMA_DATA_IN |
DES_INT_DMA_DATA_OUT));
//
// Setup the DMA module to copy data in.
//
ROM_uDMAChannelAssign(UDMA_CH21_DES0DIN);
ROM_uDMAChannelAttributeDisable(UDMA_CH21_DES0DIN,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH21_DES0DIN | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 |
UDMA_DST_INC_NONE | UDMA_ARB_2 |
UDMA_DST_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH21_DES0DIN | UDMA_PRI_SELECT,
UDMA_MODE_BASIC, (void *)pui32Src,
(void *)(DES_BASE + DES_O_DATA_L),
LengthRoundUp(ui32Length) / 4);
UARTprintf("Data in DMA request enabled.\n");
//
// Setup the DMA module to copy the data out.
//
ROM_uDMAChannelAssign(UDMA_CH22_DES0DOUT);
ROM_uDMAChannelAttributeDisable(UDMA_CH22_DES0DOUT,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH22_DES0DOUT | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_NONE |
UDMA_DST_INC_32 | UDMA_ARB_2 |
UDMA_SRC_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH22_DES0DOUT | UDMA_PRI_SELECT,
UDMA_MODE_BASIC,
(void *)(DES_BASE + DES_O_DATA_L),
(void *)pui32Dst,
LengthRoundUp(ui32Length) / 4);
UARTprintf("Data out DMA request enabled.\n");
//
// Enable DMA requests
//
ROM_DESDMAEnable(DES_BASE, DES_DMA_DATA_IN | DES_DMA_DATA_OUT);
//
// Write the length registers to start the process.
//
ROM_DESLengthSet(DES_BASE, ui32Length);
//
// Enable the DMA channels to start the transfers. This must be done after
// writing the length to prevent data from copying before the context is
// truly ready.
//
ROM_uDMAChannelEnable(UDMA_CH21_DES0DIN);
ROM_uDMAChannelEnable(UDMA_CH22_DES0DOUT);
//
// Wait for the data in DMA done interrupt.
//
while(!g_bDataInDMADoneIntFlag)
{
}
//
// Wait for the data out DMA done interrupt.
//
while(!g_bDataOutDMADoneIntFlag)
{
}
}
else
{
//
// Perform the encryption.
//
ROM_DESDataProcess(DES_BASE, pui32Src, pui32Dst, ui32Length);
}
return(true);
}
//*****************************************************************************
//
// Perform an GCM decryption operation.
//
//*****************************************************************************
bool
AESGCMDecrypt(uint32_t ui32Keysize, uint32_t *pui32Src, uint32_t *pui32Dst,
uint32_t ui32Length, uint32_t *pui32Key, uint32_t *pui32IV,
uint32_t *pui32AAD, uint32_t ui32AADLength, uint32_t *pui32Tag,
bool bUseDMA)
{
//
// Perform a soft reset.
//
ROM_AESReset(AES_BASE);
//
// Clear the interrupt flags.
//
g_bContextInIntFlag = false;
g_bDataInIntFlag = false;
g_bContextOutIntFlag = false;
g_bDataOutIntFlag = false;
g_bContextInDMADoneIntFlag = false;
g_bDataInDMADoneIntFlag = false;
g_bContextOutDMADoneIntFlag = false;
g_bDataOutDMADoneIntFlag = false;
//
// Enable all interrupts.
//
ROM_AESIntEnable(AES_BASE, (AES_INT_CONTEXT_IN | AES_INT_CONTEXT_OUT |
AES_INT_DATA_IN | AES_INT_DATA_OUT));
//
// Wait for the context in flag.
//
while(!g_bContextInIntFlag)
{
}
//
// Configure the AES module.
//
ROM_AESConfigSet(AES_BASE, (ui32Keysize | AES_CFG_DIR_DECRYPT |
AES_CFG_MODE_GCM_HY0CALC));
//
// Write the initialization value
//
ROM_AESIVSet(AES_BASE, pui32IV);
//
// Write the keys.
//
ROM_AESKey1Set(AES_BASE, pui32Key, ui32Keysize);
//
// Depending on the argument, perform the decryption
// with or without uDMA.
//
if(bUseDMA)
{
//
// Enable DMA interrupts.
//
ROM_AESIntEnable(AES_BASE, (AES_INT_DMA_CONTEXT_IN |
AES_INT_DMA_DATA_IN |
AES_INT_DMA_CONTEXT_OUT |
AES_INT_DMA_DATA_OUT));
if(ui32AADLength != 0)
{
//
// Setup the DMA module to copy auth data in.
//
ROM_uDMAChannelAssign(UDMA_CH14_AES0DIN);
ROM_uDMAChannelAttributeDisable(UDMA_CH14_AES0DIN,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH14_AES0DIN | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 |
UDMA_DST_INC_NONE | UDMA_ARB_4 |
UDMA_DST_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH14_AES0DIN | UDMA_PRI_SELECT,
UDMA_MODE_BASIC, (void *)pui32AAD,
(void *)(AES_BASE + AES_O_DATA_IN_0),
LengthRoundUp(ui32AADLength) / 4);
UARTprintf("Data in DMA request enabled.\n");
}
//
// Setup the DMA module to copy the data out.
//
ROM_uDMAChannelAssign(UDMA_CH15_AES0DOUT);
ROM_uDMAChannelAttributeDisable(UDMA_CH15_AES0DOUT,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH15_AES0DOUT | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_NONE |
UDMA_DST_INC_32 | UDMA_ARB_4 |
UDMA_SRC_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH15_AES0DOUT | UDMA_PRI_SELECT,
UDMA_MODE_BASIC,
(void *)(AES_BASE + AES_O_DATA_IN_0),
(void *)pui32Dst,
LengthRoundUp(ui32Length) / 4);
UARTprintf("Data out DMA request enabled.\n");
//
// Write the plaintext length
//
ROM_AESLengthSet(AES_BASE, (uint64_t)ui32Length);
//
// Write the auth length registers to start the process.
//
ROM_AESAuthLengthSet(AES_BASE, ui32AADLength);
//
// Enable the DMA channels to start the transfers. This must be done after
// writing the length to prevent data from copying before the context is
// truly ready.
//
if(ui32AADLength != 0)
{
ROM_uDMAChannelEnable(UDMA_CH14_AES0DIN);
}
ROM_uDMAChannelEnable(UDMA_CH15_AES0DOUT);
//
// Enable DMA requests
//
ROM_AESDMAEnable(AES_BASE, AES_DMA_DATA_IN | AES_DMA_DATA_OUT);
if(ui32AADLength != 0)
{
//
// Wait for the data in DMA done interrupt.
//
while(!g_bDataInDMADoneIntFlag)
{
}
}
if(ui32Length != 0)
{
//
// Setup the uDMA to copy the plaintext data.
//
ROM_uDMAChannelAssign(UDMA_CH14_AES0DIN);
ROM_uDMAChannelAttributeDisable(UDMA_CH14_AES0DIN,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH14_AES0DIN | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 |
UDMA_DST_INC_NONE | UDMA_ARB_4 |
UDMA_DST_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH14_AES0DIN | UDMA_PRI_SELECT,
UDMA_MODE_BASIC, (void *)pui32Src,
(void *)(AES_BASE + AES_O_DATA_IN_0),
LengthRoundUp(ui32Length) / 4);
ROM_uDMAChannelEnable(UDMA_CH14_AES0DIN);
UARTprintf("Data in DMA request enabled.\n");
//
// Wait for the data out DMA done interrupt.
//
while(!g_bDataOutDMADoneIntFlag)
{
}
}
//
// Read out the tag.
//
AESTagRead(AES_BASE, pui32Tag);
}
else
{
//
// Perform the decryption.
//
ROM_AESDataProcessAuth(AES_BASE, pui32Src, pui32Dst, ui32Length,
pui32AAD, ui32AADLength, pui32Tag);
}
return(true);
}
//*****************************************************************************
//
// Generate a hash for the given data.
//
//*****************************************************************************
void
SHA1HashGenerate(uint32_t *pui32Data, uint32_t ui32DataLength,
uint32_t *pui32HashResult, bool bUseDMA)
{
//
// Perform a soft reset of the SHA module.
//
ROM_SHAMD5Reset(SHAMD5_BASE);
//
// Clear the flags
//
g_bContextReadyFlag = false;
g_bInputReadyFlag = false;
g_bDataInDMADoneFlag = false;
g_bContextOutDMADoneFlag = false;
//
// Enable interrupts.
//
ROM_SHAMD5IntEnable(SHAMD5_BASE, (SHAMD5_INT_CONTEXT_READY |
SHAMD5_INT_PARTHASH_READY |
SHAMD5_INT_INPUT_READY |
SHAMD5_INT_OUTPUT_READY));
//
// Wait for the context ready flag.
//
while(!g_bContextReadyFlag)
{
}
//
// Configure the SHA/MD5 module.
//
ROM_SHAMD5ConfigSet(SHAMD5_BASE, SHAMD5_ALGO_SHA1);
//
// Use DMA to write the data into the SHA/MD5 module.
//
if(bUseDMA)
{
//
// Enable DMA done interrupts.
//
ROM_SHAMD5IntEnable(SHAMD5_BASE, (SHAMD5_INT_DMA_CONTEXT_IN |
SHAMD5_INT_DMA_DATA_IN |
SHAMD5_INT_DMA_CONTEXT_OUT));
if(ui32DataLength != 0)
{
//
// Setup the DMA module to copy data in.
//
ROM_uDMAChannelAssign(UDMA_CH5_SHAMD50DIN);
ROM_uDMAChannelAttributeDisable(UDMA_CH5_SHAMD50DIN,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH5_SHAMD50DIN | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 |
UDMA_DST_INC_NONE | UDMA_ARB_16 |
UDMA_DST_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH5_SHAMD50DIN | UDMA_PRI_SELECT,
UDMA_MODE_BASIC, (void *)pui32Data,
(void *)(SHAMD5_BASE +
SHAMD5_O_DATA_0_IN),
ui32DataLength / 4);
ROM_uDMAChannelEnable(UDMA_CH5_SHAMD50DIN);
UARTprintf("Data in DMA request enabled.\n");
}
//
// Setup the DMA module to copy the hash out.
//
ROM_uDMAChannelAssign(UDMA_CH6_SHAMD50COUT);
ROM_uDMAChannelAttributeDisable(UDMA_CH6_SHAMD50COUT,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH6_SHAMD50COUT | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 |
UDMA_DST_INC_32 | UDMA_ARB_8 |
UDMA_SRC_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH6_SHAMD50COUT | UDMA_PRI_SELECT,
UDMA_MODE_BASIC,
(void *)(SHAMD5_BASE + SHAMD5_O_IDIGEST_A),
(void *)pui32HashResult, 5);
ROM_uDMAChannelEnable(UDMA_CH6_SHAMD50COUT);
UARTprintf("Context out DMA request enabled.\n");
//
// Enable DMA in the SHA/MD5 module.
//
ROM_SHAMD5DMAEnable(SHAMD5_BASE);
//
// Write the length.
//
ROM_SHAMD5HashLengthSet(SHAMD5_BASE, ui32DataLength);
if(ui32DataLength != 0)
{
//
// Wait for the DMA done interrupt.
//
while(!g_bDataInDMADoneFlag)
{
}
}
//
// Wait for the next DMA done interrupt.
//
while(!g_bContextOutDMADoneFlag)
{
}
//
// Disable DMA requests.
//
ROM_SHAMD5DMADisable(SHAMD5_BASE);
}
//
// Perform hash computation by copying the data with the CPU.
//
else
{
//
// Perform the hashing operation
//
ROM_SHAMD5DataProcess(SHAMD5_BASE, pui32Data, ui32DataLength,
pui32HashResult);
}
}
// After a certain number of edges are captured, the application prints out
// the results and compares the elapsed time between edges to the expected
// value.
//
// Note that the "B" timer is used because on some devices the "A" timer does
// not work correctly with the uDMA controller. Refer to the chip errata for
// details.
//
//*****************************************************************************
int
main(void)
{
unsigned long ulIdx;
unsigned short usTimerElapsed;
//unsigned short usTimerErr;
//
// Set the clocking to run directly from the crystal.
//
ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);
//
// Initialize the UART and write a status message.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
ROM_UARTConfigSetExpClk(UART0_BASE, ROM_SysCtlClockGet(), 115200,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
UART_CONFIG_PAR_EVEN));
//UARTStdioInit(0);
//UARTprintf("\033[2JuDMA edge capture timer example\n\n");
//UARTprintf("This example requires that PD0 and PD7 be jumpered together"
// "\n\n");
//
// Create a signal source that can be used as an input for the CCP1 pin.
//
SetupSignalSource();
//
// Enable the GPIO port used for the CCP1 input.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
//
// Configure the Timer0 CCP1 function to use PD7
//
GPIOPinConfigure(GPIO_PB2_CCP3);
GPIOPinTypeTimer(GPIO_PORTB_BASE, GPIO_PIN_2);
//
// Set up Timer0B for edge-timer mode, positive edge
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);
TimerConfigure(TIMER1_BASE, TIMER_CFG_16_BIT_PAIR | TIMER_CFG_B_CAP_TIME);
TimerControlEvent(TIMER1_BASE, TIMER_B, TIMER_EVENT_BOTH_EDGES);
TimerLoadSet(TIMER1_BASE, TIMER_B, 0xffff);
//
// Enable the uDMA peripheral
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UDMA);
//
// Enable the uDMA controller error interrupt. This interrupt will occur
// if there is a bus error during a transfer.
//
ROM_IntEnable(INT_UDMAERR);
//
// Enable the uDMA controller.
//
ROM_uDMAEnable();
//
// Point at the control table to use for channel control structures.
//
ROM_uDMAControlBaseSet(ucControlTable);
//
// Put the attributes in a known state for the uDMA Timer0B channel. These
// should already be disabled by default.
//
ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_TMR1B,
UDMA_ATTR_ALTSELECT | UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
//
// Configure DMA channel for Timer0B to transfer 16-bit values, 1 at a
// time. The source is fixed and the destination increments by 16-bits
// (2 bytes) at a time.
//
ROM_uDMAChannelControlSet(UDMA_CHANNEL_TMR1B | UDMA_PRI_SELECT,
UDMA_SIZE_16 | UDMA_SRC_INC_NONE |
UDMA_DST_INC_16 | UDMA_ARB_1);
//
// Set up the transfer parameters for the Timer0B primary control
// structure. The mode is set to basic, the transfer source is the
// Timer0B register, and the destination is a memory buffer. The
// transfer size is set to a fixed number of capture events.
//
ROM_uDMAChannelTransferSet(UDMA_CHANNEL_TMR1B | UDMA_PRI_SELECT,
UDMA_MODE_BASIC,
(void *)(TIMER1_BASE + TIMER_O_TBR),
g_usTimerBuf, MAX_TIMER_EVENTS);
//
// Enable the timer capture event interrupt. Note that this signal is
// used to trigger the DMA request and not an actual interrupt.
// Start the capture timer running and enable its interrupt channel.
// The timer interrupt channel is used by the uDMA controller.
//
//UARTprintf("Starting timer and uDMA\n");
TimerIntEnable(TIMER1_BASE, TIMER_CAPB_EVENT);
TimerEnable(TIMER1_BASE, TIMER_B);
IntEnable(INT_TIMER1B);
//
// Now enable the DMA channel for Timer0B. It should now start performing
// transfers whenever there is a rising edge detected on the CCP1 pin.
//
ROM_uDMAChannelEnable(UDMA_CHANNEL_TMR1B);
//
// Enable processor interrupts.
//
ROM_IntMasterEnable();
//
// Wait for the transfer to complete.
//
//UARTprintf("Waiting for transfers to complete\n");
while(!g_bDoneFlag)
{
}
//
// Check for the expected number of occurrences of the interrupt handler,
// and that there are no DMA errors
//
if(g_uluDMAErrCount != 0)
{
//UARTprintf("\nuDMA errors were detected!!!\n\n");
}
if(g_ulTimer0BIntCount != 1)
{
//UARTprintf("\nUnexpected number of interrupts occurrred (%d)!!!\n\n",
// g_ulTimer0BIntCount);
}
//
// Display the timer values that were captured using the edge capture timer
// with uDMA. Compare the difference between stored values to the PWM
// period and make sure they match. This verifies that the edge capture
// DMA transfers were occurring with the correct timing.
//
//UARTprintf("\n Captured\n");
//UARTprintf("Event Value Difference Status\n");
//UARTprintf("----- -------- ---------- ------\n");
const unsigned char nbColonnes = '1';
UARTSend(&nbColonnes,1);
for(ulIdx = 1; ulIdx < MAX_TIMER_EVENTS; ulIdx++)
{
//
// Due to timer erratum, when the timer rolls past 0 as it counts
// down, it will trigger an additional DMA transfer even though there
// was not an edge capture. This will appear in the data buffer as
// a duplicate value - the value will be the same as the prior capture
// value. Therefore, in this example we skip past the duplicated
// value.
//
if(g_usTimerBuf[ulIdx] == g_usTimerBuf[ulIdx - 1])
{
const unsigned char dup = '$';
UARTSend(&dup,1);
//UARTprintf(" %2u 0x%04X skipped duplicate\n", ulIdx,
// g_usTimerBuf[ulIdx]);
continue;
}
//
// Compute the difference between adjacent captured values, and then
// compare that to the expected timeout period.
//
usTimerElapsed = g_usTimerBuf[ulIdx - 1] - g_usTimerBuf[ulIdx];
//usTimerErr = usTimerElapsed > TIMEOUT_VAL ?
// usTimerElapsed - TIMEOUT_VAL :
// TIMEOUT_VAL - usTimerElapsed;
//
// Print the captured value and the difference from the previous
//
unsigned char data[10];
itoa(usTimerElapsed,data);
UARTSend(data,10);
//UARTprintf(" %2u 0x%04X %8u ", ulIdx, g_usTimerBuf[ulIdx],
// usTimerElapsed);
//
// Print error status based on the deviation from expected difference
// between samples (calculated above). Allow for a difference of up
// to 1 cycle. Any more than that is considered an error.
//
//if(usTimerErr > 1)
//{
// UARTprintf(" ERROR\n");
//}
//else
//{
// UARTprintf(" OK\n");
//}
}
const unsigned char fin = '\n';
UARTSend(&fin,1);
//
// End of application
//
while(1)
{
}
}
//*****************************************************************************
//
// Process data to produce a CRC-32 checksum.
//
//*****************************************************************************
uint32_t
CRC32DataProcess(uint32_t *pui32Data, uint32_t ui32Length, uint32_t ui32Seed,
bool bUseDMA)
{
uint32_t ui32Result;
//
// Perform a soft reset.
//
ROM_SysCtlPeripheralReset(SYSCTL_PERIPH_CCM0);
while(!ROM_SysCtlPeripheralReady(SYSCTL_PERIPH_CCM0))
{
}
//
// Configure the CRC engine.
//
ROM_CRCConfigSet(CCM0_BASE, (CRC_CFG_INIT_SEED | CRC_CFG_TYPE_P4C11DB7 |
CRC_CFG_SIZE_32BIT));
//
// Write the seed.
//
ROM_CRCSeedSet(CCM0_BASE, ui32Seed);
//
// Generate CRC using uDMA to copy data.
//
if(bUseDMA)
{
//
// Setup the DMA module to copy data in.
//
ROM_uDMAChannelAssign(UDMA_CH30_SW);
ROM_uDMAChannelAttributeDisable(UDMA_CH30_SW,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelControlSet(UDMA_CH30_SW | UDMA_PRI_SELECT,
UDMA_SIZE_32 | UDMA_SRC_INC_32 |
UDMA_DST_INC_NONE | UDMA_ARB_1 |
UDMA_DST_PROT_PRIV);
ROM_uDMAChannelTransferSet(UDMA_CH30_SW | UDMA_PRI_SELECT,
UDMA_MODE_AUTO, (void *)g_pui32RandomData,
(void *)(CCM0_BASE + CCM_O_CRCDIN),
ui32Length);
ROM_uDMAChannelEnable(UDMA_CH30_SW);
UARTprintf(" Data in DMA request enabled.\n");
//
// Start the uDMA.
//
ROM_uDMAChannelRequest(UDMA_CH30_SW | UDMA_PRI_SELECT);
//
// Wait for the transfer to finish.
//
while(ROM_uDMAChannelIsEnabled(UDMA_CH30_SW))
{
}
//
// Read the result.
//
ui32Result = ROM_CRCResultRead(CCM0_BASE, false);
}
//
// Generate CRC using CPU to copy data.
//
else
{
ui32Result = ROM_CRCDataProcess(CCM0_BASE, g_pui32RandomData,
ui32Length, false);
}
return(ui32Result);
}
//*****************************************************************************
//
// Initializes the SSI1 peripheral and sets up the TX and RX uDMA channels.
// The SSI is configured for loopback mode so that any data sent on TX will be
// received on RX. The uDMA channels are configured so that the TX channel
// will copy data from a buffer to the SSI TX output. And the uDMA RX channel
// will receive any incoming data into a pair of buffers in ping-pong mode.
//
//*****************************************************************************
void
InitSSI2Transfer(void)
{
unsigned long SysClock=ROM_SysCtlClockGet();
//
// Enable the SSI peripheral, and configure it to operate even if the CPU
// is in sleep.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI2);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
ROM_SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_SSI2);
UARTprintf("%u\n",SysClock);
GPIOPinConfigure(GPIO_PB4_SSI2CLK);
GPIOPinWrite(GPIO_PORTE_BASE, GPIO_PIN_3, GPIO_PIN_3);
GPIOPinConfigure(GPIO_PB5_SSI2FSS);
GPIOPinConfigure(GPIO_PB6_SSI2RX);
GPIOPinConfigure(GPIO_PB7_SSI2TX);
GPIOPinTypeSSI(GPIO_PORTB_BASE, GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7);
//
// Configure the SSI communication parameters.
//
//UARTprintf("%u\n",SysClock);
ROM_SSIConfigSetExpClk(SSI2_BASE, SysClock,
SSI_FRF_MOTO_MODE_1,
SSI_MODE_SLAVE,
1000000,
16);
//
// Set both the TX and RX trigger thresholds to 4. This will be used by
// the uDMA controller to signal when more data should be transferred. The
// uDMA TX and RX channels will be configured so that it can transfer 4
// bytes in a burst when the SSI is ready to transfer more data.
//
//ROM_SSIFIFOLevelSet(SSI2_BASE, SSI_FIFO_TX4_8, SSI_FIFO_RX4_8);
HWREG(SSI2_BASE + SSI_O_CR1) |= 0x00000020; // set Slave Bypass mode
//
// Enable the SSI for operation, and enable the uDMA interface for both TX
// and RX channels.
//
ROM_SSIEnable(SSI2_BASE);
ROM_SSIDMAEnable(SSI2_BASE, SSI_DMA_RX | SSI_DMA_TX);
//
// This register write will set the SSI to operate in loopback mode. Any
// data sent on the TX output will be received on the RX input.
//
//
// Enable the SSI peripheral interrupts. Note that no SSI interrupts
// were enabled, but the uDMA controller will cause an interrupt on the
// SSI interrupt signal when a uDMA transfer is complete.
//
ROM_IntEnable(INT_SSI2);
//
// Put the attributes in a known state for the uDMA SSI2RX channel. These
// should already be disabled by default.
//
ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_SSI2TX,
UDMA_ATTR_ALTSELECT | UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelAssign(UDMA_CH13_SSI2TX);
//
// Configure the control parameters for the primary control structure for
// the SSI RX channel. The primary contol structure is used for the "A"
// part of the ping-pong receive. The transfer data size is 8 bits, the
// source address does not increment since it will be reading from a
// register. The destination address increment is byte 8-bit bytes. The
// arbitration size is set to 4 to match the RX FIFO trigger threshold.
// The uDMA controller will use a 4 byte burst transfer if possible. This
// will be somewhat more effecient that single byte transfers.
//
ROM_uDMAChannelControlSet(UDMA_CHANNEL_SSI2TX | UDMA_PRI_SELECT,
UDMA_SIZE_16 | UDMA_SRC_INC_16 | UDMA_DST_INC_NONE |
UDMA_ARB_4);
//
// Configure the control parameters for the alternate control structure for
// the SSI RX channel. The alternate contol structure is used for the "B"
// part of the ping-pong receive. The configuration is identical to the
// primary/A control structure.
//
ROM_uDMAChannelControlSet(UDMA_CHANNEL_SSI2TX | UDMA_ALT_SELECT,
UDMA_SIZE_16 | UDMA_SRC_INC_16 | UDMA_DST_INC_NONE |
UDMA_ARB_4);
//
// Set up the transfer parameters for the SSI RX primary control
// structure. The mode is set to ping-pong, the transfer source is the
// SSI data register, and the destination is the receive "A" buffer. The
// transfer size is set to match the size of the buffer.
//
ROM_uDMAChannelTransferSet(UDMA_CHANNEL_SSI2TX | UDMA_PRI_SELECT,
UDMA_MODE_PINGPONG,
(void *)g_uiSsiTxBufA,
(void *)(SSI2_BASE + SSI_O_DR),
SSI_TXBUF_SIZE);
//
// Set up the transfer parameters for the SSI RX alternate control
// structure. The mode is set to ping-pong, the transfer source is the
// SSI data register, and the destination is the receive "B" buffer. The
// transfer size is set to match the size of the buffer.
//
ROM_uDMAChannelTransferSet(UDMA_CHANNEL_SSI2TX | UDMA_ALT_SELECT,
UDMA_MODE_PINGPONG,
(void *)g_uiSsiTxBufB,
(void *)(SSI2_BASE + SSI_O_DR),
SSI_TXBUF_SIZE);
ROM_uDMAChannelAttributeEnable(UDMA_CHANNEL_SSI2TX, UDMA_ATTR_USEBURST);
UARTprintf("A_base: %X \n",(void *)g_uiSsiTxBufA);
UARTprintf("B_base: %X \n",(void *)(g_uiSsiTxBufB));
//
// Put the attributes in a known state for the uDMA SSI2TX channel. These
// should already be disabled by default.
//
ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_SSI2RX,
UDMA_ATTR_ALTSELECT |
UDMA_ATTR_HIGH_PRIORITY |
UDMA_ATTR_REQMASK);
ROM_uDMAChannelAssign(UDMA_CH12_SSI2RX);
//
// Set the USEBURST attribute for the uDMA SSI RX channel. This will
// force the controller to always use a burst when transferring data from
// the TX buffer to the SSI. This is somewhat more effecient bus usage
// than the default which allows single or burst transfers.
//
ROM_uDMAChannelAttributeEnable(UDMA_CHANNEL_SSI2RX, UDMA_ATTR_USEBURST);
//
// Configure the control parameters for the SSI TX. The uDMA SSI TX
// channel is used to transfer a block of data from a buffer to the SSI.
// The data size is 8 bits. The source address increment is 8-bit bytes
// since the data is coming from a buffer. The destination increment is
// none since the data is to be written to the SSI data register. The
// arbitration size is set to 4, which matches the SSI TX FIFO trigger
// threshold.
//
ROM_uDMAChannelControlSet(UDMA_CHANNEL_SSI2RX | UDMA_PRI_SELECT,
UDMA_SIZE_16 | UDMA_SRC_INC_NONE | UDMA_DST_INC_16 |
UDMA_ARB_4);
//
// Set up the transfer parameters for the uDMA SSI TX channel. This will
// configure the transfer source and destination and the transfer size.
// Basic mode is used because the peripheral is making the uDMA transfer
// request. The source is the TX buffer and the destination is the SSI
// data register.
//
ROM_uDMAChannelTransferSet(UDMA_CHANNEL_SSI2RX | UDMA_PRI_SELECT,
UDMA_MODE_BASIC,
(void *)(SSI2_BASE + SSI_O_DR),
(void *)g_uiSsiRxBuf,
SSI_RXBUF_SIZE);
//
// Now both the uDMA SSI TX and RX channels are primed to start a
// transfer. As soon as the channels are enabled, the peripheral will
// issue a transfer request and the data transfers will begin.
//
ROM_uDMAChannelEnable(UDMA_CHANNEL_SSI2TX);
ROM_uDMAChannelEnable(UDMA_CHANNEL_SSI2RX);
GPIOPinWrite(GPIO_PORTE_BASE, GPIO_PIN_3, 0);
}