/**
*
* This function gets the options for the SPI device. The options control how
* the device behaves relative to the SPI bus.
*
* @param InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return
*
* Options contains the specified options to be set. This is a bit mask where a
* 1 means to turn the option on, and a 0 means to turn the option off. One or
* more bit values may be contained in the mask. See the bit definitions named
* XSP_*_OPTIONS in the file xspi.h.
*
* @note None.
*
******************************************************************************/
u32 XSpi_GetOptions(XSpi *InstancePtr)
{
u32 OptionsFlag = 0;
u32 ControlReg;
u32 Index;
Xil_AssertNonvoid(InstancePtr != NULL);
Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
/*
* Get the control register to determine which options are currently
* set.
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
/*
* Loop through the options table to determine which options are set.
*/
for (Index = 0; Index < XSP_NUM_OPTIONS; Index++) {
if (ControlReg & OptionsTable[Index].Mask) {
OptionsFlag |= OptionsTable[Index].Option;
}
}
return OptionsFlag;
}
/**
*
* This function stops the SPI device by disabling interrupts and disabling the
* device itself. Interrupts are disabled only within the device itself. If
* desired, the caller is responsible for disabling interrupts in the interrupt
* controller and disconnecting the interrupt handler from the interrupt
* controller.
*
* In interrupt mode, if the device is in progress of transferring data on the
* SPI bus, this function returns a status indicating the device is busy. The
* user will be notified via the status handler when the transfer is complete,
* and at that time can again try to stop the device. As a master, we do not
* allow the device to be stopped while a transfer is in progress because the
* slave may be left in a bad state. As a slave, we do not allow the device to be
* stopped while a transfer is in progress because the master is not done with
* its transfer yet.
*
* @param InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return
* - XST_SUCCESS if the device is successfully started.
* - XST_DEVICE_BUSY if a transfer is in progress and cannot be
* stopped.
*
* @note
*
* This function makes use of internal resources that are shared between the
* XSpi_Stop() and XSpi_SetOptions() functions. So if one task might be setting
* device options while another is trying to stop the device, the user is
* is required to provide protection of this shared data (typically using a
* semaphore).
*
******************************************************************************/
int XSpi_Stop(XSpi *InstancePtr)
{
u32 ControlReg;
Xil_AssertNonvoid(InstancePtr != NULL);
Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
/*
* Do not allow the user to stop the device while a transfer is in
* progress.
*/
if (InstancePtr->IsBusy) {
return XST_DEVICE_BUSY;
}
/*
* Disable the device. First disable the interrupts since there is
* a critical section here because this register is also modified during
* interrupt context. The device is likely disabled already since there
* is no transfer in progress, but we do it again just to be sure.
*/
XSpi_IntrGlobalDisable(InstancePtr);
ControlReg = XSpi_GetControlReg(InstancePtr);
XSpi_SetControlReg(InstancePtr, ControlReg & ~XSP_CR_ENABLE_MASK);
InstancePtr->IsStarted = 0;
return XST_SUCCESS;
}
/**
*
* This function sets the options for the SPI device driver. The options control
* how the device behaves relative to the SPI bus. The device must be idle
* rather than busy transferring data before setting these device options.
*
* @param InstancePtr is a pointer to the XSpi instance to be worked on.
* @param Options contains the specified options to be set. This is a bit
* mask where a 1 means to turn the option on, and a 0 means to
* turn the option off. One or more bit values may be contained in
* the mask.
* See the bit definitions named XSP_*_OPTIONS in the file xspi.h.
*
* @return
* -XST_SUCCESS if options are successfully set.
* - XST_DEVICE_BUSY if the device is currently transferring data.
* The transfer must complete or be aborted before setting options.
* - XST_SPI_SLAVE_ONLY if the caller attempted to configure a
* slave-only device as a master.
*
* @note
*
* This function makes use of internal resources that are shared between the
* XSpi_Stop() and XSpi_SetOptions() functions. So if one task might be setting
* device options while another is trying to stop the device, the user is
* required to provide protection of this shared data (typically using a
* semaphore).
*
******************************************************************************/
int XSpi_SetOptions(XSpi *InstancePtr, u32 Options)
{
u32 ControlReg;
u32 Index;
Xil_AssertNonvoid(InstancePtr != NULL);
Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
/*
* Do not allow the slave select to change while a transfer is in
* progress.
* No need to worry about a critical section here since even if the Isr
* changes the busy flag just after we read it, the function will return
* busy and the caller can retry when notified that their current
* transfer is done.
*/
if (InstancePtr->IsBusy) {
return XST_DEVICE_BUSY;
}
/*
* Do not allow master option to be set if the device is slave only.
*/
if ((Options & XSP_MASTER_OPTION) && (InstancePtr->SlaveOnly)) {
return XST_SPI_SLAVE_ONLY;
}
ControlReg = XSpi_GetControlReg(InstancePtr);
/*
* Loop through the options table, turning the option on or off
* depending on whether the bit is set in the incoming options flag.
*/
for (Index = 0; Index < XSP_NUM_OPTIONS; Index++) {
if (Options & OptionsTable[Index].Option) {
/*
*Turn it ON.
*/
ControlReg |= OptionsTable[Index].Mask;
}
else {
/*
*Turn it OFF.
*/
ControlReg &= ~OptionsTable[Index].Mask;
}
}
/*
* Now write the control register. Leave it to the upper layers
* to restart the device.
*/
XSpi_SetControlReg(InstancePtr, ControlReg);
return XST_SUCCESS;
}
/**
*
* This function enables interrupts for the SPI device. If the Spi driver is used
* in interrupt mode, it is up to the user to connect the SPI interrupt handler
* to the interrupt controller before this function is called. If the Spi driver
* is used in polled mode the user has to disable the Global Interrupts after
* this function is called. If the device is configured with FIFOs, the FIFOs are
* reset at this time.
*
* @param InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return
* - XST_SUCCESS if the device is successfully started
* - XST_DEVICE_IS_STARTED if the device was already started.
*
* @note None.
*
******************************************************************************/
int XSpi_Start(XSpi *InstancePtr)
{
u32 ControlReg;
Xil_AssertNonvoid(InstancePtr != NULL);
Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
/*
* If it is already started, return a status indicating so.
*/
if (InstancePtr->IsStarted == XIL_COMPONENT_IS_STARTED) {
return XST_DEVICE_IS_STARTED;
}
/*
* Enable the interrupts.
*/
XSpi_IntrEnable(InstancePtr, XSP_INTR_DFT_MASK);
/*
* Indicate that the device is started before we enable the transmitter
* or receiver or interrupts.
*/
InstancePtr->IsStarted = XIL_COMPONENT_IS_STARTED;
/*
* Reset the transmit and receive FIFOs if present. There is a critical
* section here since this register is also modified during interrupt
* context. So we wait until after the r/m/w of the control register to
* enable the Global Interrupt Enable.
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
ControlReg |= XSP_CR_TXFIFO_RESET_MASK | XSP_CR_RXFIFO_RESET_MASK |
XSP_CR_ENABLE_MASK;
XSpi_SetControlReg(InstancePtr, ControlReg);
/*
* Enable the Global Interrupt Enable just after we start.
*/
XSpi_IntrGlobalEnable(InstancePtr);
return XST_SUCCESS;
}
/*
*
* Runs an internal loopback test on the SPI device. This is done as a master
* with a enough data to fill the FIFOs if FIFOs are present. If the device is
* configured as a slave-only, this function returns successfully even though
* no loopback test is performed.
*
* This function does not restore the device context after performing the test
* as it assumes the device will be reset after the call.
*
* @param InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return
* - XST_SUCCESS if loopback was performed successfully or not
* performed at all if device is slave-only.
* - XST_LOOPBACK_ERROR if loopback failed.
*
* @note None.
*
******************************************************************************/
static int LoopbackTest(XSpi *InstancePtr)
{
u32 StatusReg;
u32 ControlReg;
u32 Index;
u32 Data;
u32 RxData;
u32 NumSent = 0;
u32 NumRecvd = 0;
u8 DataWidth;
/*
* Cannot run as a slave-only because we need to be master in order to
* initiate a transfer. Still return success, though.
*/
if (InstancePtr->SlaveOnly) {
return XST_SUCCESS;
}
/*
* Setup the control register to enable master mode and the loopback so
* that data can be sent and received.
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_LOOPBACK_MASK | XSP_CR_MASTER_MODE_MASK);
/*
* We do not need interrupts for this loopback test.
*/
XSpi_IntrGlobalDisable(InstancePtr);
DataWidth = InstancePtr->DataWidth;
/*
* Send data up to the maximum size of the transmit register, which is
* one byte without FIFOs. We send data 4 times just to exercise the
* device through more than one iteration.
*/
for (Index = 0; Index < 4; Index++) {
Data = 0;
/*
* Fill the transmit register.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
while ((StatusReg & XSP_SR_TX_FULL_MASK) == 0) {
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
Data = 0;
} else if (DataWidth == XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word (16 bit).
*/
Data = XSP_HALF_WORD_TESTBYTE;
} else if (DataWidth == XSP_DATAWIDTH_WORD){
/*
* Data Transfer Width is Word (32 bit).
*/
Data = XSP_WORD_TESTBYTE;
}
XSpi_WriteReg(InstancePtr->BaseAddr, XSP_DTR_OFFSET,
Data + Index);
NumSent += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
}
/*
* Start the transfer by not inhibiting the transmitter and
* enabling the device.
*/
ControlReg = XSpi_GetControlReg(InstancePtr) &
(~XSP_CR_TRANS_INHIBIT_MASK);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_ENABLE_MASK);
/*
* Wait for the transfer to be done by polling the transmit
* empty status bit.
*/
do {
StatusReg = XSpi_IntrGetStatus(InstancePtr);
} while ((StatusReg & XSP_INTR_TX_EMPTY_MASK) == 0);
XSpi_IntrClear(InstancePtr, XSP_INTR_TX_EMPTY_MASK);
/*
* Receive and verify the data just transmitted.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
while ((StatusReg & XSP_SR_RX_EMPTY_MASK) == 0) {
RxData = XSpi_ReadReg(InstancePtr->BaseAddr,
XSP_DRR_OFFSET);
if (DataWidth == XSP_DATAWIDTH_BYTE) {
if((u8)RxData != Index) {
return XST_LOOPBACK_ERROR;
}
} else if (DataWidth ==
XSP_DATAWIDTH_HALF_WORD) {
if((u16)RxData != (u16)(Index +
XSP_HALF_WORD_TESTBYTE)) {
return XST_LOOPBACK_ERROR;
}
} else if (DataWidth == XSP_DATAWIDTH_WORD) {
if(RxData != (u32)(Index + XSP_WORD_TESTBYTE)) {
return XST_LOOPBACK_ERROR;
}
}
NumRecvd += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
}
/*
* Stop the transfer (hold off automatic sending) by inhibiting
* the transmitter and disabling the device.
*/
ControlReg |= XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr ,
ControlReg & ~ XSP_CR_ENABLE_MASK);
}
/*
* One final check to make sure the total number of bytes sent equals
* the total number of bytes received.
*/
if (NumSent != NumRecvd) {
return XST_LOOPBACK_ERROR;
}
return XST_SUCCESS;
}
/**
*
* Runs a self-test on the driver/device. The self-test is destructive in that
* a reset of the device is performed in order to check the reset values of
* the registers and to get the device into a known state. A simple loopback
* test is also performed to verify that transmit and receive are working
* properly. The device is changed to master mode for the loopback test, since
* only a master can initiate a data transfer.
*
* Upon successful return from the self-test, the device is reset.
*
* @param InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return
* - XST_SUCCESS if successful.
* - XST_REGISTER_ERROR indicates a register did not read or write
* correctly.
* - XST_LOOPBACK_ERROR if a loopback error occurred.
*
* @note None.
*
******************************************************************************/
int XSpi_SelfTest(XSpi *InstancePtr)
{
int Result;
u32 Register;
Xil_AssertNonvoid(InstancePtr != NULL);
Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
/* Return Success if XIP Mode */
if((InstancePtr->XipMode) == 1) {
return XST_SUCCESS;
}
/*
* Reset the SPI device to leave it in a known good state.
*/
XSpi_Reset(InstancePtr);
if(InstancePtr->XipMode)
{
Register = XSpi_GetControlReg(InstancePtr);
if (Register != XSP_CR_RESET_STATE) {
return XST_REGISTER_ERROR;
}
Register = XSpi_GetStatusReg(InstancePtr);
if ((Register & XSP_SR_RESET_STATE) != XSP_SR_RESET_STATE) {
return XST_REGISTER_ERROR;
}
}
/*
* All the SPI registers should be in their default state right now.
*/
Register = XSpi_GetControlReg(InstancePtr);
if (Register != XSP_CR_RESET_STATE) {
return XST_REGISTER_ERROR;
}
Register = XSpi_GetStatusReg(InstancePtr);
if ((Register & XSP_SR_RESET_STATE) != XSP_SR_RESET_STATE) {
return XST_REGISTER_ERROR;
}
/*
* Each supported slave select bit should be set to 1.
*/
Register = XSpi_GetSlaveSelectReg(InstancePtr);
if (Register != InstancePtr->SlaveSelectMask) {
return XST_REGISTER_ERROR;
}
/*
* If configured with FIFOs, the occupancy values should be 0.
*/
if (InstancePtr->HasFifos) {
Register = XSpi_ReadReg(InstancePtr->BaseAddr,
XSP_TFO_OFFSET);
if (Register != 0) {
return XST_REGISTER_ERROR;
}
Register = XSpi_ReadReg(InstancePtr->BaseAddr,
XSP_RFO_OFFSET);
if (Register != 0) {
return XST_REGISTER_ERROR;
}
}
/*
* Run loopback test only in case of standard SPI mode.
*/
if (InstancePtr->SpiMode != XSP_STANDARD_MODE) {
return XST_SUCCESS;
}
/*
* Run an internal loopback test on the SPI.
*/
Result = LoopbackTest(InstancePtr);
if (Result != XST_SUCCESS) {
return Result;
}
/*
* Reset the SPI device to leave it in a known good state.
*/
XSpi_Reset(InstancePtr);
return XST_SUCCESS;
}
/*
* Change LO frequency in integer mode
* frequency must be multiple of 40 (MHz)
*/
int trf3795changeFreqInt(XSpi *InstancePtr, u32 freq)
{
u32 StatusReg;
u32 ControlReg;
u32 Index;
u32 Delay;
u32 Data;
u32 NumSent = 0;
u32 NumRecvd = 0;
u32 RxData[] = {0,0,0};
u32 reg1Val, reg2Val, reg6Val;
u8 DataWidth;
u8 j;
int ctr;
u8 loDivSel, loDiv;
u8 pllDiv;
u8 pllDivSel;
u8 prscSel;
u16 rDiv;
u16 nInt;
// Calculate parameter and register values
freq = freq/2; // Output frequency is doubled
if(freq>2400)
{
loDiv = 1;
loDivSel = 0;
}
else if(freq>1200)
{
loDiv = 2;
loDivSel = 1;
}
else if(freq>600)
{
loDiv = 4;
loDivSel = 2;
}
else if(freq>300)
{
loDiv = 8;
loDivSel = 3;
}
pllDiv = (u8)ceil((double)loDiv*freq/3000.0);
//xil_printf("Pll Div %d\r\n", pllDiv);
rDiv = 1;
nInt = (u16)(loDiv*freq*rDiv/(10*pllDiv));
if(pllDiv==1)
pllDivSel = 0;
else if(pllDiv==2)
pllDivSel = 1;
else if(pllDiv==4)
pllDivSel = 2;
else
{
xil_printf("Invalid PLL_DIV!\r\n");
return XST_FAILURE;
}
if(nInt>=72)
prscSel = 1;
else
prscSel = 0;
//xil_printf("NInt %d\r\n", nInt);
//xil_printf("prscSel %d\r\n", prscSel);
//xil_printf("loDiv %d\r\n", loDiv);
reg1Val = XSP_REG1_WRITE_CF + (rDiv<<5);
reg2Val = XSP_REG2_WRITE_CF + (nInt<<5) + (pllDivSel<<21) + (prscSel<<23);
reg6Val = XSP_REG6_WRITE_CF + (loDivSel<<23);
u32 write_trf_register[] = {reg1Val,reg6Val,reg2Val};
u32 reg_list = {1,2,6};
//xil_printf("reg1: %x", reg1Val);
//xil_printf("reg2: %x", reg2Val);
//xil_printf("reg6: %x", reg6Val);
/*
* Setup the control reogister to enable master mode and
* to send least significant bit 1st
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
XSpi_SetControlReg(InstancePtr, ControlReg | XSP_CR_MASTER_MODE_MASK |
XSP_CR_LSB_FIRST);
//xil_printf("ctrl reg setup done\r\n");
/*
* Set the slave select zero bit to active - low
*/
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFE);
/*
* We do not need interrupts for now
*/
XSpi_IntrGlobalDisable(InstancePtr);
DataWidth = InstancePtr->DataWidth;
/*****************************************************************************/
/*
* perform a write to a TRF3765 register
*/
for (Index = 0; Index < 3; Index++) { // for loop write to three registers
Data = 0;
xil_printf("start transfer %d\r\n", Index);
/*
* Fill the transmit register.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
//xil_printf("got status reg\r\n");
// while ((StatusReg & XSP_SR_TX_FULL_MASK) == 0) { // no loop, do just a single transfer for now
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
Data = 0;
} else if (DataWidth == XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word (16 bit).
*/
Data = XSP_HALF_WORD_TESTBYTE;
} else if (DataWidth == XSP_DATAWIDTH_WORD){
/*
* Data Transfer Width is Word (32 bit).
*/
Data = write_trf_register[Index]; // choose the register index 0 to 7 ************
//xil_printf("selected register \r\n");
}
XSpi_WriteReg(InstancePtr->BaseAddr, XSP_DTR_OFFSET, Data);
//xil_printf("wrote data \r\n");
NumSent += (DataWidth >> 3);
//xil_printf("Numsent %d\r\n", NumSent);
StatusReg = XSpi_GetStatusReg(InstancePtr);
//xil_printf("status reg %d \r\n", StatusReg);
// }
/*
* Start the transfer by not inhibiting the transmitter and
* enabling the device.
*/
ControlReg = XSpi_GetControlReg(InstancePtr) &
(~XSP_CR_TRANS_INHIBIT_MASK);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_ENABLE_MASK);
/*
* Wait for the transfer to be done by polling the transmit
* empty status bit.
*/
//xil_printf("start for loop\r\n");
//xil_printf("status reg %d\r\n", XSpi_IntrGetStatus(InstancePtr));
ctr = 0;
do {
StatusReg = XSpi_IntrGetStatus(InstancePtr);
if(ctr > SPI_TIMEOUT)
break;
ctr++;
} while ((StatusReg & XSP_INTR_TX_EMPTY_MASK) == 0);
//xil_printf("done with while loop \r\n");
XSpi_IntrClear(InstancePtr, XSP_INTR_TX_EMPTY_MASK);
/*
* To create a latch enable pulse and extra read clock pulse,
* set the slave select one SS(1) bit low
*/
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFD); // creates read pulse and clock
for (Delay = 0; Delay < 10; Delay++) // more delay makes wider pulses
{}
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFF); // removes read pulse and clock
/*
* To create a latch enable pulse,
* set the slave select one SS(0) bit low
*/
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFE); // drives the latch enable
// for (Delay = 0; Delay < 10; Delay++) // more delay makes pulse wider
// {}
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFF); // removes the latch enable
/*
* Stop the transfer (hold off automatic sending) by inhibiting
* the transmitter and disabling the device.
*/
ControlReg |= XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr ,
ControlReg & ~ XSP_CR_ENABLE_MASK);
//xil_printf("Done transfer %d\r\n", Index);
}
XSpi_Reset(InstancePtr);
return XST_SUCCESS;
}
/*
* Enables the fractional mode of the LO
* LO must be initialized first
*/
int trf3795EnableInt(XSpi *InstancePtr)
{
u32 StatusReg;
u32 ControlReg;
u32 Index;
u32 Delay;
u32 Data;
u32 NumSent = 0;
u32 NumRecvd = 0;
u32 RxData[] = {0,0,0};
u8 DataWidth;
u8 j;
int ctr;
u32 write_trf_register[] = {XSP_REG0_WRITE,XSP_REG1_WRITE,XSP_REG2_WRITE,XSP_REG3_WRITE,
XSP_REG4_WRITE,XSP_REG5_WRITE,XSP_REG6_WRITE,XSP_REG7_WRITE};
/*
* Setup the control reogister to enable master mode and
* to send least significant bit 1st
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
XSpi_SetControlReg(InstancePtr, ControlReg | XSP_CR_MASTER_MODE_MASK |
XSP_CR_LSB_FIRST);
/*
* Set the slave select zero bit to active - low
*/
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFE);
/*
* We do not need interrupts for now
*/
XSpi_IntrGlobalDisable(InstancePtr);
DataWidth = InstancePtr->DataWidth;
/*****************************************************************************/
/*
* perform a write to a TRF3765 register
*/
for (Index = 0; Index < 8; Index++) { // for loop write to all eight registers
Data = 0;
/*
* Fill the transmit register.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
// while ((StatusReg & XSP_SR_TX_FULL_MASK) == 0) { // no loop, do just a single transfer for now
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
Data = 0;
} else if (DataWidth == XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word (16 bit).
*/
Data = XSP_HALF_WORD_TESTBYTE;
} else if (DataWidth == XSP_DATAWIDTH_WORD){
/*
* Data Transfer Width is Word (32 bit).
*/
Data = write_trf_register[Index]; // choose the register index 0 to 7 ************
}
XSpi_WriteReg(InstancePtr->BaseAddr, XSP_DTR_OFFSET, Data);
NumSent += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
// }
/*
* Start the transfer by not inhibiting the transmitter and
* enabling the device.
*/
ControlReg = XSpi_GetControlReg(InstancePtr) &
(~XSP_CR_TRANS_INHIBIT_MASK);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_ENABLE_MASK);
/*
* Wait for the transfer to be done by polling the transmit
* empty status bit.
*/
do {
StatusReg = XSpi_IntrGetStatus(InstancePtr);
if(ctr > SPI_TIMEOUT)
break;
ctr++;
} while ((StatusReg & XSP_INTR_TX_EMPTY_MASK) == 0);
XSpi_IntrClear(InstancePtr, XSP_INTR_TX_EMPTY_MASK);
/*
* To create a latch enable pulse and extra read clock pulse,
* set the slave select one SS(1) bit low
*/
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFD); // creates read pulse and clock
for (Delay = 0; Delay < 10; Delay++) // more delay makes wider pulses
{}
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFF); // removes read pulse and clock
/*
* To create a latch enable pulse,
* set the slave select one SS(0) bit low
*/
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFE); // drives the latch enable
// for (Delay = 0; Delay < 10; Delay++) // more delay makes pulse wider
// {}
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFF); // removes the latch enable
/*
* Stop the transfer (hold off automatic sending) by inhibiting
* the transmitter and disabling the device.
*/
ControlReg |= XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr ,
ControlReg & ~ XSP_CR_ENABLE_MASK);
}
XSpi_Reset(InstancePtr);
return XST_SUCCESS;
}
/* Write to and read back the RF board TRF3795
*
*
******************************************************************************/
static int trf3795WriteAndRead(XSpi *InstancePtr)
{
u32 StatusReg;
u32 ControlReg;
u32 Index;
u32 Delay;
u32 Data;
u32 NumSent = 0;
u32 NumRecvd = 0;
u32 RxData[] = {0,0,0};
u8 DataWidth;
u8 j;
int ctr = 0;
u32 write_trf_register[] = {XSP_REG0_WRITE,XSP_REG1_WRITE,XSP_REG2_WRITE_ENC,XSP_REG3_WRITE,
XSP_REG4_WRITE,XSP_REG5_WRITE,XSP_REG6_WRITE, XSP_REG7_WRITE};
u32 read_trf_register[] = {XSP_REG0_READBACK,XSP_REG1_READBACK,XSP_REG2_READBACK,XSP_REG3_READBACK,
XSP_REG4_READBACK,XSP_REG5_READBACK,XSP_REG6_READBACK,XSP_REG7_READBACK,XSP_REG7_READBACK};
/*
* Setup the control register to enable master mode and
* to send least significant bit 1st
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
XSpi_SetControlReg(InstancePtr, ControlReg | XSP_CR_MASTER_MODE_MASK |
XSP_CR_LSB_FIRST);
/*
* Set the slave select zero bit to active - low
*/
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFE);
/*
* We do not need interrupts for now
*/
XSpi_IntrGlobalDisable(InstancePtr);
DataWidth = InstancePtr->DataWidth;
/*****************************************************************************/
/*
* perform a write to a TRF3765 register
*/
for (Index = 0; Index < 8; Index++) { // for loop write to all eight registers
Data = 0;
/*
* Fill the transmit register.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
// while ((StatusReg & XSP_SR_TX_FULL_MASK) == 0) { // no loop, do just a single transfer for now
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
Data = 0;
} else if (DataWidth == XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word (16 bit).
*/
Data = XSP_HALF_WORD_TESTBYTE;
} else if (DataWidth == XSP_DATAWIDTH_WORD){
/*
* Data Transfer Width is Word (32 bit).
*/
Data = write_trf_register[Index]; // choose the register index 0 to 7 ************
}
XSpi_WriteReg(InstancePtr->BaseAddr, XSP_DTR_OFFSET, Data);
NumSent += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
// }
/*
* Start the transfer by not inhibiting the transmitter and
* enabling the device.
*/
ControlReg = XSpi_GetControlReg(InstancePtr) &
(~XSP_CR_TRANS_INHIBIT_MASK);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_ENABLE_MASK);
/*
* Wait for the transfer to be done by polling the transmit
* empty status bit.
*/
//xil_printf("status reg %d \r\n", StatusReg);
//xil_printf("intr status reg %d \r\n", XSpi_IntrGetStatus(InstancePtr));
ctr = 0;
do {
StatusReg = XSpi_IntrGetStatus(InstancePtr);
if(ctr > SPI_TIMEOUT)
break;
ctr++;
} while ((StatusReg & XSP_INTR_TX_EMPTY_MASK) == 0);
XSpi_IntrClear(InstancePtr, XSP_INTR_TX_EMPTY_MASK);
/*
* To create a latch enable pulse and extra read clock pulse,
* set the slave select one SS(1) bit low
*/
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFD); // creates read pulse and clock
for (Delay = 0; Delay < 10; Delay++) // more delay makes wider pulses
{}
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFF); // removes read pulse and clock
/*
* To create a latch enable pulse,
* set the slave select one SS(0) bit low
*/
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFE); // drives the latch enable
// for (Delay = 0; Delay < 10; Delay++) // more delay makes pulse wider
// {}
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFF); // removes the latch enable
/*
* Stop the transfer (hold off automatic sending) by inhibiting
* the transmitter and disabling the device.
*/
ControlReg |= XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr ,
ControlReg & ~ XSP_CR_ENABLE_MASK);
// } // end of the for loop
/*****************************************************************************/
/*
* To Read-back from the Internal Register Banks, Register 0 must be programmed
* with a specific command that sets the TRF3765 into read-back mode and
* specifies the register to be read
*/
// for (Index = 0; Index < 1; Index++) {
// Data = 0;
/*
* Fill the transmit register.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
// while ((StatusReg & XSP_SR_TX_FULL_MASK) == 0) { // do just a single transfer for now
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
Data = 0;
} else if (DataWidth == XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word (16 bit).
*/
Data = XSP_HALF_WORD_TESTBYTE;
} else if (DataWidth == XSP_DATAWIDTH_WORD){
/*
* Data Transfer Width is Word (32 bit).
*/
Data = read_trf_register[Index]; // index of the register to readback here *********************
}
XSpi_WriteReg(InstancePtr->BaseAddr, XSP_DTR_OFFSET, Data);
NumSent += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
// }
/*
* Start the transfer by not inhibiting the transmitter and
* enabling the device.
*/
ControlReg = XSpi_GetControlReg(InstancePtr) &
(~XSP_CR_TRANS_INHIBIT_MASK);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_ENABLE_MASK); // | XSP_CR_CLK_PHASE_MASK);
/*
* Wait for the transfer to be done by polling the transmit
* empty status bit.
*/
ctr = 0;
do {
StatusReg = XSpi_IntrGetStatus(InstancePtr);
if(ctr > SPI_TIMEOUT)
break;
ctr++;
} while ((StatusReg & XSP_INTR_TX_EMPTY_MASK) == 0);
XSpi_IntrClear(InstancePtr, XSP_INTR_TX_EMPTY_MASK);
for (Delay = 0; Delay < 10; Delay++) // add delay
{}
/*
* To create a latch enable pulse and extra read clock pulse,
* set the slave select one SS(1) bit low
*/
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFD); // creates read pulse and clock
for (Delay = 0; Delay < 10; Delay++) // more delay makes wider pulses
{}
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFF); // removes read pulse and clock
for (Delay = 0; Delay < 10; Delay++) // add delay
{}
/*
* Stop the transfer (hold off automatic sending) by inhibiting
* the transmitter and disabling the device.
*/
ControlReg |= XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr ,
ControlReg & ~ XSP_CR_ENABLE_MASK);
// } // end of the for loop
/*
************* Now read-back the specific register *********************************
*/
// for (Index = 0; Index < 1; Index++) {
// Data = 0;
/*
* Fill the transmit register.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
// while ((StatusReg & XSP_SR_TX_FULL_MASK) == 0) { // do just a single transfer for now
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
Data = 0;
} else if (DataWidth == XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word (16 bit).
*/
Data = XSP_HALF_WORD_TESTBYTE;
} else if (DataWidth == XSP_DATAWIDTH_WORD){
/*
* Data Transfer Width is Word (32 bit).
*/
Data = XSP_ZERO_WRITE; // just leave the data bits at zero during read-back
}
XSpi_WriteReg(InstancePtr->BaseAddr, XSP_DTR_OFFSET,
Data + Index);
NumSent += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
// }
/*
* Start the transfer by not inhibiting the transmitter and
* enabling the device.
*/
ControlReg = XSpi_GetControlReg(InstancePtr) &
(~XSP_CR_TRANS_INHIBIT_MASK);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_ENABLE_MASK | XSP_CR_CLK_PHASE_MASK); // clock data in on the second edge (falling)
/*
* Wait for the transfer to be done by polling the transmit
* empty status bit.
*/
ctr = 0;
do {
StatusReg = XSpi_IntrGetStatus(InstancePtr);
if(ctr > SPI_TIMEOUT)
break;
ctr++;
} while ((StatusReg & XSP_INTR_TX_EMPTY_MASK) == 0);
XSpi_IntrClear(InstancePtr, XSP_INTR_TX_EMPTY_MASK);
/*
* Receive and verify the data just transmitted.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
while ((StatusReg & XSP_SR_RX_EMPTY_MASK) == 0) {
for (j = 0; j < 3; j++) {
RxData[j] = XSpi_ReadReg(InstancePtr->BaseAddr,
XSP_DRR_OFFSET);
NumRecvd += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
}
xil_printf("\r%08x\n\r", RxData[2]);
}
/*
* Stop the transfer (hold off automatic sending) by inhibiting
* the transmitter and disabling the device.
*/
ControlReg |= XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr ,
ControlReg & ~ XSP_CR_ENABLE_MASK);
} // end of the for loop
/*
* One final check to make sure the total number of bytes sent equals
* the total number of bytes received.
*/
// if (NumSent != NumRecvd) {
// return XST_LOOPBACK_ERROR;
// }
xil_printf("\n\rTRF3765 Register Access Done\n\r");
return XST_SUCCESS;
}
int trf3795ReadBackRegs(XSpi *InstancePtr)
{
u32 StatusReg;
u32 ControlReg;
u32 Index;
u32 Delay;
u32 Data;
u32 NumSent = 0;
u32 NumRecvd = 0;
u32 RxData[] = {0,0,0};
u8 DataWidth;
u8 j;
u32 read_trf_register[] = {XSP_REG0_READBACK,XSP_REG1_READBACK,XSP_REG2_READBACK,XSP_REG3_READBACK,
XSP_REG4_READBACK,XSP_REG5_READBACK,XSP_REG6_READBACK,XSP_REG7_READBACK};
ControlReg = XSpi_GetControlReg(InstancePtr);
XSpi_SetControlReg(InstancePtr, ControlReg | XSP_CR_MASTER_MODE_MASK |
XSP_CR_LSB_FIRST);
xil_printf("ctrl reg setup done\r\n");
/*
* Set the slave select zero bit to active - low
*/
// XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFE);
/*
* We do not need interrupts for now
*/
XSpi_IntrGlobalDisable(InstancePtr);
DataWidth = InstancePtr->DataWidth;
StatusReg = XSpi_GetStatusReg(InstancePtr);
for(Index=0; Index<8; Index++)
{
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
Data = 0;
} else if (DataWidth == XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word (16 bit).
*/
Data = XSP_HALF_WORD_TESTBYTE;
} else if (DataWidth == XSP_DATAWIDTH_WORD){
/*
* Data Transfer Width is Word (32 bit).
*/
Data = read_trf_register[Index]; // index of the register to readback here *********************
}
XSpi_WriteReg(InstancePtr->BaseAddr, XSP_DTR_OFFSET, Data);
NumSent += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
/*
* Start the transfer by not inhibiting the transmitter and
* enabling the device.
*/
ControlReg = XSpi_GetControlReg(InstancePtr) &
(~XSP_CR_TRANS_INHIBIT_MASK);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_ENABLE_MASK); // | XSP_CR_CLK_PHASE_MASK);
/*
* Wait for the transfer to be done by polling the transmit
* empty status bit.
*/
//xil_printf("enter first tx while loop \r\n");
do {
StatusReg = XSpi_IntrGetStatus(InstancePtr);
} while ((StatusReg & XSP_INTR_TX_EMPTY_MASK) == 0);
XSpi_IntrClear(InstancePtr, XSP_INTR_TX_EMPTY_MASK);
for (Delay = 0; Delay < 10; Delay++) // add delay
{}
/*
* To create a latch enable pulse and extra read clock pulse,
* set the slave select one SS(1) bit low
*/
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFD); // creates read pulse and clock
for (Delay = 0; Delay < 10; Delay++) // more delay makes wider pulses
{}
XSpi_SetSlaveSelectReg(InstancePtr, 0xFFFF); // removes read pulse and clock
for (Delay = 0; Delay < 10; Delay++) // add delay
{}
/*
* Stop the transfer (hold off automatic sending) by inhibiting
* the transmitter and disabling the device.
*/
ControlReg |= XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr ,
ControlReg & ~ XSP_CR_ENABLE_MASK);
// } // end of the for loop
/*
************* Now read-back the specific register *********************************
*/
// for (Index = 0; Index < 1; Index++) {
// Data = 0;
/*
* Fill the transmit register.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
// while ((StatusReg & XSP_SR_TX_FULL_MASK) == 0) { // do just a single transfer for now
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
Data = 0;
} else if (DataWidth == XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word (16 bit).
*/
Data = XSP_HALF_WORD_TESTBYTE;
} else if (DataWidth == XSP_DATAWIDTH_WORD){
/*
* Data Transfer Width is Word (32 bit).
*/
Data = XSP_ZERO_WRITE; // just leave the data bits at zero during read-back
}
XSpi_WriteReg(InstancePtr->BaseAddr, XSP_DTR_OFFSET,
Data + Index);
NumSent += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
// }
/*
* Start the transfer by not inhibiting the transmitter and
* enabling the device.
*/
ControlReg = XSpi_GetControlReg(InstancePtr) &
(~XSP_CR_TRANS_INHIBIT_MASK);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_ENABLE_MASK | XSP_CR_CLK_PHASE_MASK); // clock data in on the second edge (falling)
/*
* Wait for the transfer to be done by polling the transmit
* empty status bit.
*/
//xil_printf("Enter tx empty while loop\r\n");
do {
StatusReg = XSpi_IntrGetStatus(InstancePtr);
} while ((StatusReg & XSP_INTR_TX_EMPTY_MASK) == 0);
XSpi_IntrClear(InstancePtr, XSP_INTR_TX_EMPTY_MASK);
/*
* Receive and verify the data just transmitted.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
//xil_printf("Enter rx empty while loop\r\n");
while ((StatusReg & XSP_SR_RX_EMPTY_MASK) == 0) {
for (j = 0; j < 3; j++) {
RxData[j] = XSpi_ReadReg(InstancePtr->BaseAddr,
XSP_DRR_OFFSET);
NumRecvd += (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
}
xil_printf("\r%08x\n\r", RxData[2]);
}
/*
* Stop the transfer (hold off automatic sending) by inhibiting
* the transmitter and disabling the device.
*/
ControlReg |= XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr ,
ControlReg & ~ XSP_CR_ENABLE_MASK);
} // end of the for loop
xil_printf("\n\rTRF3765 Register Access Done\n\r");
return XST_SUCCESS;
}
/**
*
* Transfers the specified data on the SPI bus. If the SPI device is configured
* to be a master, this function initiates bus communication and sends/receives
* the data to/from the selected SPI slave. If the SPI device is configured to
* be a slave, this function prepares the data to be sent/received when selected
* by a master. For every byte sent, a byte is received.
*
* This function/driver operates in interrupt mode and polled mode.
* - In interrupt mode this function is non-blocking and the transfer is
* initiated by this function and completed by the interrupt service routine.
* - In polled mode this function is blocking and the control exits this
* function only after all the requested data is transferred.
*
* The caller has the option of providing two different buffers for send and
* receive, or one buffer for both send and receive, or no buffer for receive.
* The receive buffer must be at least as big as the send buffer to prevent
* unwanted memory writes. This implies that the byte count passed in as an
* argument must be the smaller of the two buffers if they differ in size.
* Here are some sample usages:
* <pre>
* XSpi_Transfer(InstancePtr, SendBuf, RecvBuf, ByteCount)
* The caller wishes to send and receive, and provides two different
* buffers for send and receive.
*
* XSpi_Transfer(InstancePtr, SendBuf, NULL, ByteCount)
* The caller wishes only to send and does not care about the received
* data. The driver ignores the received data in this case.
*
* XSpi_Transfer(InstancePtr, SendBuf, SendBuf, ByteCount)
* The caller wishes to send and receive, but provides the same buffer
* for doing both. The driver sends the data and overwrites the send
* buffer with received data as it transfers the data.
*
* XSpi_Transfer(InstancePtr, RecvBuf, RecvBuf, ByteCount)
* The caller wishes to only receive and does not care about sending
* data. In this case, the caller must still provide a send buffer, but
* it can be the same as the receive buffer if the caller does not care
* what it sends. The device must send N bytes of data if it wishes to
* receive N bytes of data.
* </pre>
* In interrupt mode, though this function takes a buffer as an argument, the
* driver can only transfer a limited number of bytes at time. It transfers only
* one byte at a time if there are no FIFOs, or it can transfer the number of
* bytes up to the size of the FIFO if FIFOs exist.
* - In interrupt mode a call to this function only starts the transfer, the
* subsequent transfer of the data is performed by the interrupt service
* routine until the entire buffer has been transferred.The status callback
* function is called when the entire buffer has been sent/received.
* - In polled mode this function is blocking and the control exits this
* function only after all the requested data is transferred.
*
* As a master, the SetSlaveSelect function must be called prior to this
* function.
*
* @param InstancePtr is a pointer to the XSpi instance to be worked on.
* @param SendBufPtr is a pointer to a buffer of data which is to be sent.
* This buffer must not be NULL.
* @param RecvBufPtr is a pointer to a buffer which will be filled with
* received data. This argument can be NULL if the caller does not
* wish to receive data.
* @param ByteCount contains the number of bytes to send/receive. The
* number of bytes received always equals the number of bytes sent.
*
* @return
* -XST_SUCCESS if the buffers are successfully handed off to the
* driver for transfer. Otherwise, returns:
* - XST_DEVICE_IS_STOPPED if the device must be started before
* transferring data.
* - XST_DEVICE_BUSY indicates that a data transfer is already in
* progress. This is determined by the driver.
* - XST_SPI_NO_SLAVE indicates the device is configured as a
* master and a slave has not yet been selected.
*
* @notes
*
* This function is not thread-safe. The higher layer software must ensure that
* no two threads are transferring data on the SPI bus at the same time.
*
******************************************************************************/
int XSpi_Transfer(XSpi *InstancePtr, u8 *SendBufPtr,
u8 *RecvBufPtr, unsigned int ByteCount)
{
u32 ControlReg;
u32 GlobalIntrReg;
u32 StatusReg;
u32 Data = 0;
u8 DataWidth;
/*
* The RecvBufPtr argument can be NULL.
*/
Xil_AssertNonvoid(InstancePtr != NULL);
Xil_AssertNonvoid(SendBufPtr != NULL);
Xil_AssertNonvoid(ByteCount > 0);
Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
if (InstancePtr->IsStarted != XIL_COMPONENT_IS_STARTED) {
return XST_DEVICE_IS_STOPPED;
}
/*
* Make sure there is not a transfer already in progress. No need to
* worry about a critical section here. Even if the Isr changes the bus
* flag just after we read it, a busy error is returned and the caller
* can retry when it gets the status handler callback indicating the
* transfer is done.
*/
if (InstancePtr->IsBusy) {
return XST_DEVICE_BUSY;
}
/*
* Save the Global Interrupt Enable Register.
*/
GlobalIntrReg = XSpi_IsIntrGlobalEnabled(InstancePtr);
/*
* Enter a critical section from here to the end of the function since
* state is modified, an interrupt is enabled, and the control register
* is modified (r/m/w).
*/
XSpi_IntrGlobalDisable(InstancePtr);
ControlReg = XSpi_GetControlReg(InstancePtr);
/*
* If configured as a master, be sure there is a slave select bit set
* in the slave select register. If no slaves have been selected, the
* value of the register will equal the mask. When the device is in
* loopback mode, however, no slave selects need be set.
*/
if (ControlReg & XSP_CR_MASTER_MODE_MASK) {
if ((ControlReg & XSP_CR_LOOPBACK_MASK) == 0) {
if (InstancePtr->SlaveSelectReg ==
InstancePtr->SlaveSelectMask) {
if (GlobalIntrReg == TRUE) {
/* Interrupt Mode of operation */
XSpi_IntrGlobalEnable(InstancePtr);
}
return XST_SPI_NO_SLAVE;
}
}
}
/*
* Set the slave select register to select the device on the SPI before
* starting the transfer of data.
*/
XSpi_SetSlaveSelectReg(InstancePtr,
InstancePtr->SlaveSelectReg);
/*
* Set the busy flag, which will be cleared when the transfer
* is completely done.
*/
InstancePtr->IsBusy = TRUE;
/*
* Set up buffer pointers.
*/
InstancePtr->SendBufferPtr = SendBufPtr;
InstancePtr->RecvBufferPtr = RecvBufPtr;
InstancePtr->RequestedBytes = ByteCount;
InstancePtr->RemainingBytes = ByteCount;
DataWidth = InstancePtr->DataWidth;
/*
* Fill the DTR/FIFO with as many bytes as it will take (or as many as
* we have to send). We use the tx full status bit to know if the device
* can take more data. By doing this, the driver does not need to know
* the size of the FIFO or that there even is a FIFO. The downside is
* that the status register must be read each loop iteration.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
while (((StatusReg & XSP_SR_TX_FULL_MASK) == 0) &&
(InstancePtr->RemainingBytes > 0)) {
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
Data = *InstancePtr->SendBufferPtr;
} else if (DataWidth == XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word (16 bit).
*/
Data = *(u16 *)InstancePtr->SendBufferPtr;
} else if (DataWidth == XSP_DATAWIDTH_WORD){
/*
* Data Transfer Width is Word (32 bit).
*/
Data = *(u32 *)InstancePtr->SendBufferPtr;
}
XSpi_WriteReg(InstancePtr->BaseAddr, XSP_DTR_OFFSET, Data);
InstancePtr->SendBufferPtr += (DataWidth >> 3);
InstancePtr->RemainingBytes -= (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
}
/*
* Start the transfer by no longer inhibiting the transmitter and
* enabling the device. For a master, this will in fact start the
* transfer, but for a slave it only prepares the device for a transfer
* that must be initiated by a master.
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
ControlReg &= ~XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr, ControlReg);
/*
* If the interrupts are enabled as indicated by Global Interrupt
* Enable Register, then enable the transmit empty interrupt to operate
* in Interrupt mode of operation.
*/
if (GlobalIntrReg == TRUE) { /* Interrupt Mode of operation */
/*
* Enable the transmit empty interrupt, which we use to
* determine progress on the transmission.
*/
XSpi_IntrEnable(InstancePtr, XSP_INTR_TX_EMPTY_MASK);
/*
* End critical section.
*/
XSpi_IntrGlobalEnable(InstancePtr);
} else { /* Polled mode of operation */
/*
* If interrupts are not enabled, poll the status register to
* Transmit/Receive SPI data.
*/
while(ByteCount > 0) {
/*
* Wait for the transfer to be done by polling the
* Transmit empty status bit
*/
do {
StatusReg = XSpi_GetStatusReg(InstancePtr);
} while ((StatusReg & XSP_SR_TX_EMPTY_MASK) == 0);
/*
* A transmit has just completed. Process received data
* and check for more data to transmit. Always inhibit
* the transmitter while the transmit register/FIFO is
* being filled, or make sure it is stopped if we're
* done.
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
XSpi_SetControlReg(InstancePtr, ControlReg |
XSP_CR_TRANS_INHIBIT_MASK);
/*
* First get the data received as a result of the
* transmit that just completed. We get all the data
* available by reading the status register to determine
* when the Receive register/FIFO is empty. Always get
* the received data, but only fill the receive
* buffer if it points to something (the upper layer
* software may not care to receive data).
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
while ((StatusReg & XSP_SR_RX_EMPTY_MASK) == 0) {
Data = XSpi_ReadReg(InstancePtr->BaseAddr,
XSP_DRR_OFFSET);
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte (8 bit).
*/
if(InstancePtr->RecvBufferPtr != NULL) {
*InstancePtr->RecvBufferPtr++ =
(u8)Data;
}
} else if (DataWidth ==
XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half Word
* (16 bit).
*/
if (InstancePtr->RecvBufferPtr != NULL){
*(u16 *)InstancePtr->RecvBufferPtr =
(u16)Data;
InstancePtr->RecvBufferPtr += 2;
}
} else if (DataWidth == XSP_DATAWIDTH_WORD) {
/*
* Data Transfer Width is Word (32 bit).
*/
if (InstancePtr->RecvBufferPtr != NULL){
*(u32 *)InstancePtr->RecvBufferPtr =
Data;
InstancePtr->RecvBufferPtr += 4;
}
}
InstancePtr->Stats.BytesTransferred +=
(DataWidth >> 3);
ByteCount -= (DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(InstancePtr);
}
if (InstancePtr->RemainingBytes > 0) {
/*
* Fill the DTR/FIFO with as many bytes as it
* will take (or as many as we have to send).
* We use the Tx full status bit to know if the
* device can take more data.
* By doing this, the driver does not need to
* know the size of the FIFO or that there even
* is a FIFO.
* The downside is that the status must be read
* each loop iteration.
*/
StatusReg = XSpi_GetStatusReg(InstancePtr);
while(((StatusReg & XSP_SR_TX_FULL_MASK)== 0) &&
(InstancePtr->RemainingBytes > 0)) {
if (DataWidth == XSP_DATAWIDTH_BYTE) {
/*
* Data Transfer Width is Byte
* (8 bit).
*/
Data = *InstancePtr->
SendBufferPtr;
} else if (DataWidth ==
XSP_DATAWIDTH_HALF_WORD) {
/*
* Data Transfer Width is Half
* Word (16 bit).
*/
Data = *(u16 *)InstancePtr->
SendBufferPtr;
} else if (DataWidth ==
XSP_DATAWIDTH_WORD) {
/*
* Data Transfer Width is Word
* (32 bit).
*/
Data = *(u32 *)InstancePtr->
SendBufferPtr;
}
XSpi_WriteReg(InstancePtr->BaseAddr,
XSP_DTR_OFFSET, Data);
InstancePtr->SendBufferPtr +=
(DataWidth >> 3);
InstancePtr->RemainingBytes -=
(DataWidth >> 3);
StatusReg = XSpi_GetStatusReg(
InstancePtr);
}
/*
* Start the transfer by not inhibiting the
* transmitter any longer.
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
ControlReg &= ~XSP_CR_TRANS_INHIBIT_MASK;
XSpi_SetControlReg(InstancePtr, ControlReg);
}
}
/*
* Stop the transfer (hold off automatic sending) by inhibiting
* the transmitter.
*/
ControlReg = XSpi_GetControlReg(InstancePtr);
XSpi_SetControlReg(InstancePtr,
ControlReg | XSP_CR_TRANS_INHIBIT_MASK);
/*
* Select the slave on the SPI bus when the transfer is
* complete, this is necessary for some SPI devices,
* such as serial EEPROMs work correctly as chip enable
* may be connected to slave select
*/
XSpi_SetSlaveSelectReg(InstancePtr,
InstancePtr->SlaveSelectMask);
InstancePtr->IsBusy = FALSE;
}