diff options
| -rw-r--r-- | ports/stm32/dma.c | 10 | ||||
| -rw-r--r-- | ports/stm32/dma.h | 8 |
2 files changed, 18 insertions, 0 deletions
diff --git a/ports/stm32/dma.c b/ports/stm32/dma.c index ba09dc170..4b078eebb 100644 --- a/ports/stm32/dma.c +++ b/ports/stm32/dma.c @@ -1233,3 +1233,13 @@ void dma_nohal_start(const dma_descr_t *descr, uint32_t src_addr, uint32_t dst_a } #endif + +#define DMA_ID_FROM_CONTROLLER_STREAM(c, s) ((s) + (c) * NSTREAMS_PER_CONTROLLER) + +void dma_external_acquire(uint32_t controller, uint32_t stream) { + dma_enable_clock(DMA_ID_FROM_CONTROLLER_STREAM(controller, stream)); +} + +void dma_external_release(uint32_t controller, uint32_t stream) { + dma_disable_clock(DMA_ID_FROM_CONTROLLER_STREAM(controller, stream)); +} diff --git a/ports/stm32/dma.h b/ports/stm32/dma.h index 8bd101a61..00200bae4 100644 --- a/ports/stm32/dma.h +++ b/ports/stm32/dma.h @@ -102,13 +102,21 @@ extern const dma_descr_t dma_I2C_4_RX; #endif +// API that configures the DMA via the HAL. void dma_init(DMA_HandleTypeDef *dma, const dma_descr_t *dma_descr, uint32_t dir, void *data); void dma_init_handle(DMA_HandleTypeDef *dma, const dma_descr_t *dma_descr, uint32_t dir, void *data); void dma_deinit(const dma_descr_t *dma_descr); void dma_invalidate_channel(const dma_descr_t *dma_descr); +// API that configures the DMA directly and does not use the HAL. void dma_nohal_init(const dma_descr_t *descr, uint32_t config); void dma_nohal_deinit(const dma_descr_t *descr); void dma_nohal_start(const dma_descr_t *descr, uint32_t src_addr, uint32_t dst_addr, uint16_t len); +// API to be used if DMA is controlled externally, to ensure the clock remains enabled. +// - controller: should be 0 or 1, corresponding to DMA1 or DMA2 +// - stream: should be 0 to N, corresponding to Stream0..StreamN, or Channel1..ChannelN +void dma_external_acquire(uint32_t controller, uint32_t stream); +void dma_external_release(uint32_t controller, uint32_t stream); + #endif // MICROPY_INCLUDED_STM32_DMA_H |