diff options
| -rw-r--r-- | src/stm32/spi.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/stm32/spi.c b/src/stm32/spi.c index b78196d8..f1ba33cf 100644 --- a/src/stm32/spi.c +++ b/src/stm32/spi.c @@ -109,12 +109,15 @@ spi_transfer(struct spi_config config, uint8_t receive_data, { SPI_TypeDef *spi = config.spi; while (len--) { - writeb((void *)&spi->DR, *data); + writeb((void*)&spi->DR, *data); while (!(spi->SR & SPI_SR_RXNE)) ; - uint8_t rdata = readb((void *)&spi->DR); + uint8_t rdata = readb((void*)&spi->DR); if (receive_data) *data = rdata; data++; } + // Wait for any remaining SCLK updates before returning + while ((spi->SR & (SPI_SR_TXE|SPI_SR_BSY)) != SPI_SR_TXE) + ; } |