/*********************************************************************//**
* @brief SPI Read write data function
* @param[in] SPIx Pointer to SPI peripheral, should be LPC_SPI
* @param[in] dataCfg Pointer to a SPI_DATA_SETUP_Type structure that
* contains specified information about transmit
* data configuration.
* @param[in] xfType Transfer type, should be:
* - SPI_TRANSFER_POLLING: Polling mode
* - SPI_TRANSFER_INTERRUPT: Interrupt mode
* @return Actual Data length has been transferred in polling mode.
* In interrupt mode, always return (0)
* Return (-1) if error.
* Note: This function can be used in both master and slave mode.
***********************************************************************/
int32_t SPI_ReadWrite (LPC_SPI_TypeDef *SPIx, SPI_DATA_SETUP_Type *dataCfg, \
SPI_TRANSFER_Type xfType)
{
uint8_t *rdata8;
uint8_t *wdata8;
uint16_t *rdata16;
uint16_t *wdata16;
uint32_t stat;
uint32_t temp;
uint8_t dataword;
//read for empty buffer
temp = SPIx->SPDR;
//dummy to clear status
temp = SPIx->SPSR;
dataCfg->counter = 0;
dataCfg->status = 0;
if(SPI_GetDataSize (SPIx) == 8)
dataword = 0;
else dataword = 1;
if (xfType == SPI_TRANSFER_POLLING){
if (dataword == 0){
rdata8 = (uint8_t *)dataCfg->rx_data;
wdata8 = (uint8_t *)dataCfg->tx_data;
} else {
rdata16 = (uint16_t *)dataCfg->rx_data;
wdata16 = (uint16_t *)dataCfg->tx_data;
}
while(dataCfg->counter < dataCfg->length)
{
// Write data to buffer
if(dataCfg->tx_data == NULL){
if (dataword == 0){
SPI_SendData(SPIx, 0xFF);
} else {
SPI_SendData(SPIx, 0xFFFF);
}
} else {
if (dataword == 0){
SPI_SendData(SPIx, *wdata8);
wdata8++;
} else {
SPI_SendData(SPIx, *wdata16);
wdata16++;
}
}
// Wait for transfer complete
while (!((stat = SPIx->SPSR) & SPI_SPSR_SPIF));
// Check for error
if (stat & (SPI_SPSR_ABRT | SPI_SPSR_MODF | SPI_SPSR_ROVR | SPI_SPSR_WCOL)){
// save status
dataCfg->status = stat | SPI_STAT_ERROR;
return (dataCfg->counter);
}
// Read data from SPI dat
temp = (uint32_t) SPI_ReceiveData(SPIx);
// Store data to destination
if (dataCfg->rx_data != NULL)
{
if (dataword == 0){
*(rdata8) = (uint8_t) temp;
rdata8++;
} else {
*(rdata16) = (uint16_t) temp;
rdata16++;
}
}
// Increase counter
if (dataword == 0){
dataCfg->counter++;
} else {
dataCfg->counter += 2;
}
}
// Return length of actual data transferred
// save status
dataCfg->status = stat | SPI_STAT_DONE;
return (dataCfg->counter);
}
// Interrupt mode
else {
// Check if interrupt flag is already set
if(SPIx->SPINT & SPI_SPINT_INTFLAG){
SPIx->SPINT = SPI_SPINT_INTFLAG;
}
if (dataCfg->counter < dataCfg->length){
// Write data to buffer
if(dataCfg->tx_data == NULL){
if (dataword == 0){
SPI_SendData(SPIx, 0xFF);
} else {
SPI_SendData(SPIx, 0xFFFF);
}
} else {
if (dataword == 0){
SPI_SendData(SPIx, (*(uint8_t *)dataCfg->tx_data));
} else {
SPI_SendData(SPIx, (*(uint16_t *)dataCfg->tx_data));
}
}
SPI_IntCmd(SPIx, ENABLE);
} else {
// Save status
dataCfg->status = SPI_STAT_DONE;
}
return (0);
}
}
/*********************************************************************//**
* @brief SPI Interrupt used for reading and writing handler
* @param None
* @return None
***********************************************************************/
void SPI_IRQHandler(void)
{
SPI_DATA_SETUP_Type *xf_setup;
uint16_t tmp;
uint8_t dataword;
xf_setup = &xferConfig;
if(SPI_GetDataSize(LPC_SPI) == 8)
dataword = 0;
else dataword = 1;
/* Dummy read to clear SPI interrupt flag */
SPI_ClearIntPending(LPC_SPI);
// save status
tmp = SPI_GetStatus(LPC_SPI);
xf_setup->status = tmp;
// Check for error
if (tmp & (SPI_SPSR_ABRT | SPI_SPSR_MODF | SPI_SPSR_ROVR | SPI_SPSR_WCOL)){
xf_setup->status |= SPI_STAT_ERROR;
// Disable Interrupt and call call-back
SPI_IntCmd(LPC_SPI, DISABLE);
// Set Complete Flag
complete = SET;
return;
}
/* Check SPI complete flag */
if (tmp & SPI_SPSR_SPIF){
// Read data from SPI data
tmp = SPI_ReceiveData(LPC_SPI);
if (xf_setup->rx_data != NULL)
{
if (dataword == 0){
*(uint8_t *)((uint8_t *)(xf_setup->rx_data) + xf_setup->counter) = (uint8_t) tmp;
} else {
*(uint16_t *)((uint8_t *)(xf_setup->rx_data) + xf_setup->counter) = (uint8_t) tmp;
}
}
// Increase counter
if (dataword == 0){
xf_setup->counter++;
} else {
xf_setup->counter += 2;
}
}
if (xf_setup->counter < xf_setup->length){
// Write data to buffer
if(xf_setup->tx_data == NULL){
if (dataword == 0){
SPI_SendData(LPC_SPI, 0xFF);
} else {
SPI_SendData(LPC_SPI, 0xFFFF);
}
} else {
if (dataword == 0){
SPI_SendData(LPC_SPI, (*(uint8_t *)((uint8_t *)(xf_setup->tx_data) + xf_setup->counter)));
} else {
SPI_SendData(LPC_SPI, (*(uint16_t *)((uint8_t *)(xf_setup->tx_data) + xf_setup->counter)));
}
}
}
// No more data to send
else {
xf_setup->status |= SPI_STAT_DONE;
// Disable Interrupt and call call-back
SPI_IntCmd(LPC_SPI, DISABLE);
// Set Complete Flag
complete = SET;
}
}
