diff options
Diffstat (limited to 'os/hal/ports/STM32/LLD/SPIv1/i2s_lld.c')
| -rw-r--r-- | os/hal/ports/STM32/LLD/SPIv1/i2s_lld.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/os/hal/ports/STM32/LLD/SPIv1/i2s_lld.c b/os/hal/ports/STM32/LLD/SPIv1/i2s_lld.c index e95ac27ba..26f6bb5fc 100644 --- a/os/hal/ports/STM32/LLD/SPIv1/i2s_lld.c +++ b/os/hal/ports/STM32/LLD/SPIv1/i2s_lld.c @@ -419,14 +419,22 @@ void i2s_lld_start_exchange(I2SDriver *i2sp) { */
void i2s_lld_stop_exchange(I2SDriver *i2sp) {
- /* Stop DMAs.*/
- if (NULL != i2sp->dmatx)
+ /* Stop TX DMA, if enabled.*/
+ if (NULL != i2sp->dmatx) {
dmaStreamDisable(i2sp->dmatx);
- if (NULL != i2sp->dmarx)
- dmaStreamDisable(i2sp->dmarx);
- /* Stop transfer.*/
+ /* From the RM: To switch off the I2S, by clearing I2SE, it is mandatory
+ to wait for TXE = 1 and BSY = 0.*/
+ while ((i2sp->spi->SR & (SPI_SR_TXE | SPI_SR_BSY)) != SPI_SR_TXE)
+ ;
+ }
+
+ /* Stop SPI/I2S peripheral.*/
i2sp->spi->I2SCFGR &= ~SPI_I2SCFGR_I2SE;
+
+ /* Stop RX DMA, if enabled.*/
+ if (NULL != i2sp->dmarx)
+ dmaStreamDisable(i2sp->dmarx);
}
#endif /* HAL_USE_I2S */
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