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stmhal/spi: Clean and/or invalidate D-cache before SPI DMA transfers. 

On MCUs with a cache (eg F7) this must be done or else the SPI data that is
transferred is incorrect.
This commit is contained in:
Damien George 2017-03-28 12:54:01 +11:00
parent 9a1b3da158
commit ff927cb106
1 changed files with 4 additions and 1 deletions
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5
stmhal/spi.c
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@ -419,6 +419,7 @@ STATIC void spi_transfer(const pyb_spi_obj_t *self, size_t len, const uint8_t *s
dma_init(&tx_dma, self->tx_dma_descr, self->spi);
self->spi->hdmatx = &tx_dma;
self->spi->hdmarx = NULL;
MP_HAL_CLEAN_DCACHE(src, len);
status = HAL_SPI_Transmit_DMA(self->spi, (uint8_t*)src, len);
if (status == HAL_OK) {
status = spi_wait_dma_finished(self->spi, timeout);
@ -440,7 +441,7 @@ STATIC void spi_transfer(const pyb_spi_obj_t *self, size_t len, const uint8_t *s
}
dma_init(&rx_dma, self->rx_dma_descr, self->spi);
self->spi->hdmarx = &rx_dma;
MP_HAL_CLEANINVALIDATE_DCACHE(dest, len);
status = HAL_SPI_Receive_DMA(self->spi, dest, len);
if (status == HAL_OK) {
status = spi_wait_dma_finished(self->spi, timeout);
@ -460,6 +461,8 @@ STATIC void spi_transfer(const pyb_spi_obj_t *self, size_t len, const uint8_t *s
self->spi->hdmatx = &tx_dma;
dma_init(&rx_dma, self->rx_dma_descr, self->spi);
self->spi->hdmarx = &rx_dma;
MP_HAL_CLEAN_DCACHE(src, len);
MP_HAL_CLEANINVALIDATE_DCACHE(dest, len);
status = HAL_SPI_TransmitReceive_DMA(self->spi, (uint8_t*)src, dest, len);
if (status == HAL_OK) {
status = spi_wait_dma_finished(self->spi, timeout);