/*FUNCTION****************************************************************
*
* Function Name : _dspi_isr
* Returned Value : SPI interrupt routine
* Comments :
* State machine transferring data between buffers and DSPI FIFO.
*
*END*********************************************************************/
static void _dspi_isr
(
/* [IN] The address of the device specific information */
void *parameter
)
{
DSPI_INFO_STRUCT_PTR dspi_info_ptr = parameter;
VDSPI_REG_STRUCT_PTR dspi_ptr = dspi_info_ptr->DSPI_PTR;
uint32_t data;
/* drain RX FIFO */
if (DSPI_CTAR_FMSZ_GET(dspi_ptr->CTAR[0]) > 7)
{
/* frame is larger than a single byte */
while (dspi_ptr->SR & DSPI_SR_RFDF_MASK)
{
data = DSPI_POPR_RXDATA_GET(dspi_ptr->POPR);
dspi_ptr->SR = DSPI_SR_RFDF_MASK;
if (dspi_info_ptr->RX_LEN)
{
dspi_info_ptr->RX_LEN--;
if (dspi_info_ptr->RX_BUF)
{
dspi_info_ptr->RX_BUF[0] = data>>8;
dspi_info_ptr->RX_BUF[1] = data&0xff;
dspi_info_ptr->RX_BUF += 2;
}
}
}
/*FUNCTION****************************************************************
*
* Function Name : _dspi_polled_tx_rx_master
* Returned Value : number of frames transferred
* Comments :
* Actual transmit and receive function.
* Overrun prevention used, no need to update statistics in this function
*
*END*********************************************************************/
static uint_32 _dspi_polled_tx_rx_master
(
/* [IN] Device specific context structure */
DSPI_INFO_STRUCT_PTR io_info_ptr,
/* [IN] Data to transmit */
uint_8_ptr output,
/* [OUT] Received data */
uint_8_ptr input,
/* [IN] Length of transfer in bytes */
uint_32 len
)
{
VDSPI_REG_STRUCT_PTR dspi_ptr = io_info_ptr->DSPI_PTR;
uint_32 out_len;
uint_32 in_len;
uint_32 frames;
uint_32 command;
uint_32 data;
in_len = out_len = len;
command = DSPI_PUSHR_CONT_MASK | DSPI_PUSHR_PCS(io_info_ptr->CS) | DSPI_PUSHR_CTAS(0);
data = 0; /* dummy patern to send in rx only mode */
/* Is frame larger than a single byte? */
if (DSPI_CTAR_FMSZ_GET(dspi_ptr->CTAR[0]) > 7)
{
while (in_len)
{
if ((dspi_ptr->SR & DSPI_SR_TFFF_MASK) && ((in_len-out_len)<DSPI_POLLED_FIFO_DEPTH) && out_len)
{
if (output)
data = *output++;
out_len--;
if (out_len)
{
if (output)
data = (data << 8) | *output++;
out_len--;
}
dspi_ptr->PUSHR = command | DSPI_PUSHR_TXDATA(data);
dspi_ptr->SR |= DSPI_SR_TFFF_MASK;
}
if (dspi_ptr->SR & DSPI_SR_RFDF_MASK)
{
data = DSPI_POPR_RXDATA_GET(dspi_ptr->POPR);
dspi_ptr->SR |= DSPI_SR_RFDF_MASK;
if (input)
*input++ = data >> 8;
in_len--;
if (in_len)
{
if (input)
*input++ = data & 0xff;
in_len--;
}
}
}
frames = (len+1)/2;
}
