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Fix dropped bytes on spi write 

The cyhal_spi_send api was changed to read and discard a byte on every
send operation (at the protocol level all SPI transfers are bidirectional).
This means that to achieve a truly bidirectional transfer, the
cyhal_spi_transfer API must be called (as opposed to a write followed
by a read).
pull/11894/head
Shuopeng Deng 2019-10-08 11:03:10 -07:00 committed by adbridge
parent 82ecd19e9c
commit 61218d00ea
1 changed files with 5 additions and 6 deletions
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11
targets/TARGET_Cypress/TARGET_PSOC6/cy_spi_api.c
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@ -130,12 +130,11 @@ void spi_frequency(spi_t *obj, int hz)
int spi_master_write(spi_t *obj, int value)
{
struct spi_s *spi = cy_get_spi(obj);
uint32_t received;
if (CY_RSLT_SUCCESS != cyhal_spi_send(&(spi->hal_spi), (uint32_t)value)) {
MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER_SPI, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_spi_send");
}
if (CY_RSLT_SUCCESS != cyhal_spi_recv(&(spi->hal_spi), &received)) {
MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER_SPI, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_spi_recv");
uint8_t received;
uint8_t value_byte = (uint8_t)value;
if (CY_RSLT_SUCCESS != cyhal_spi_transfer(&(spi->hal_spi), &value_byte, 1, &received, 1, 0xff)) {
MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER_SPI, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_spi_transfer");
}
return (int)received;
}