mirrors
/
micropython
mirror of https://github.com/micropython/micropython.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

stm32/dma: Add functions for external users of DMA to enable clock. 

Any external user of DMA (eg a board with a custom DMA driver) must call
dma_external_acquire() for their DMA controller/stream to ensure that the
DMA clock is not automatically turned off while it's still being used
externally.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2021-09-15 21:12:53 +10:00
parent c51cc46bf8
commit 0c0807e084
2 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
ports/stm32/dma.c
View File

@ -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));
}

8
ports/stm32/dma.h
View File

@ -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