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samv7/spi: Allow 16-bit word size in spi_send

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Signed-off-by: Jaroslav Beran <jara.beran@gmail.com>
This commit is contained in:
Jaroslav Beran 2021-06-03 11:37:54 +02:00 committed by Xiang Xiao
parent 69b3f034a4
commit d13be4ea57
1 changed files with 22 additions and 11 deletions
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21
arch/arm/src/samv7/sam_spi.c
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@ -1420,15 +1420,13 @@ static void spi_setbits(struct spi_dev_s *dev, int nbits)
****************************************************************************/ ****************************************************************************/
static uint32_t spi_send(struct spi_dev_s *dev, uint32_t wd) static uint32_t spi_send(struct spi_dev_s *dev, uint32_t wd)
{
struct sam_spics_s *spics = (struct sam_spics_s *)dev;
if (spics->nbits <= 8)
{ {
uint8_t txbyte; uint8_t txbyte;
uint8_t rxbyte; uint8_t rxbyte;
/* spi_exchange can do this. Note: right now, this only deals with 8-bit
* words. If the SPI interface were configured for words of other sizes,
* this would fail.
*/
txbyte = (uint8_t)wd; txbyte = (uint8_t)wd;
rxbyte = (uint8_t)0; rxbyte = (uint8_t)0;
spi_exchange(dev, &txbyte, &rxbyte, 1); spi_exchange(dev, &txbyte, &rxbyte, 1);
@ -1436,6 +1434,19 @@ static uint32_t spi_send(struct spi_dev_s *dev, uint32_t wd)
spiinfo("Sent %02x received %02x\n", txbyte, rxbyte); spiinfo("Sent %02x received %02x\n", txbyte, rxbyte);
return (uint32_t)rxbyte; return (uint32_t)rxbyte;
} }
else
{
uint16_t txword;
uint16_t rxword;
txword = (uint16_t)wd;
rxword = (uint16_t)0;
spi_exchange(dev, &txword, &rxword, 1);
spiinfo("Sent %02x received %02x\n", txword, rxword);
return (uint32_t)rxword;
}
}
/**************************************************************************** /****************************************************************************
* Name: spi_exchange (and spi_exchange_nodma) * Name: spi_exchange (and spi_exchange_nodma)