//*****************************************************************************
//
//! Starts playback of a block of PCM audio samples.
//!
//! \param pvData is a pointer to the audio data to play.
//! \param ulLength is the length of the data in bytes.
//! \param pfnCallback is a function to call when this buffer has be played.
//!
//! This function starts the playback of a block of PCM audio samples. If
//! playback of another buffer is currently ongoing, its playback is cancelled
//! and the buffer starts playing immediately.
//!
//! \return 0 if the buffer was accepted, returns non-zero if there was no
//! space available for this buffer.
//
//*****************************************************************************
unsigned long
SoundBufferPlay(const void *pvData, unsigned long ulLength,
tBufferCallback pfnCallback)
{
unsigned long ulChannel;
unsigned long ulDMASetting;
//
// Must disable I2S interrupts during this time to prevent state problems.
//
ROM_IntDisable(INT_I2S0);
//
// Save the buffer information.
//
g_sBuffers[g_ulPlaying].pulData = (const unsigned long *)pvData;
g_sBuffers[g_ulPlaying].ulSize = ulLength;
g_sBuffers[g_ulPlaying].pfnBufferCallback = pfnCallback;
//
// Configure the I2S TX DMA channel.
// Program it to only use burst transfer. The arb size is 8 to
// match the FIFO trigger level (set above).
// The transfer size is 32 bits, from the TX buffer to the
// TX FIFO.
//
ROM_uDMAChannelAttributeEnable(UDMA_CHANNEL_I2S0TX,
(UDMA_ATTR_USEBURST |
UDMA_ATTR_HIGH_PRIORITY));
if(g_ulPlaying)
{
ulChannel = UDMA_CHANNEL_I2S0TX | UDMA_ALT_SELECT;
}
else
{
ulChannel = UDMA_CHANNEL_I2S0TX | UDMA_PRI_SELECT;
}
if(g_usChannels == 1)
{
if(g_usBitsPerSample == 8)
{
ulDMASetting = UDMA_SIZE_8 | UDMA_SRC_INC_8 |
UDMA_DST_INC_NONE | UDMA_ARB_4;
}
else
{
ulDMASetting = UDMA_SIZE_16 | UDMA_SRC_INC_16 |
UDMA_DST_INC_NONE | UDMA_ARB_4;
//
// Modify the DMA transfer is 16 bits.
//
g_sBuffers[g_ulPlaying].ulSize >>= 1;
}
}
else
{
if(g_usBitsPerSample == 8)
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);
}
//*****************************************************************************
//
// 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);
}
//*****************************************************************************
//
// 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);
}
