diff options
| author | Damien George <damien@micropython.org> | 2022-03-17 17:09:28 +1100 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2022-03-22 12:43:53 +1100 |
| commit | f0be0de34185e77141205499f5f7563c6450df5f (patch) | |
| tree | 492d58b1ed2effc50f8b4a2c693c8b4d617d0f8f | |
| parent | 63c7593df66533fc0c529d2ed2a5da38042c8970 (diff) | |
stm32/dma: Add option to disable auto-DMA-turn-off.
Signed-off-by: Damien George <damien@micropython.org>
| -rw-r--r-- | ports/stm32/dma.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/ports/stm32/dma.c b/ports/stm32/dma.c index 75c34325d..cb8e555df 100644 --- a/ports/stm32/dma.c +++ b/ports/stm32/dma.c @@ -34,6 +34,12 @@ #include "dma.h" #include "irq.h" +// When this option is enabled, the DMA will turn off automatically after +// a period of inactivity. +#ifndef MICROPY_HW_DMA_ENABLE_AUTO_TURN_OFF +#define MICROPY_HW_DMA_ENABLE_AUTO_TURN_OFF (1) +#endif + #define DMA_IDLE_ENABLED() (dma_idle.enabled != 0) #define DMA_SYSTICK_LOG2 (3) #define DMA_SYSTICK_MASK ((1 << DMA_SYSTICK_LOG2) - 1) @@ -653,7 +659,9 @@ static const uint8_t dma_irqn[NSTREAM] = { static DMA_HandleTypeDef *dma_handle[NSTREAM] = {NULL}; static uint8_t dma_last_sub_instance[NSTREAM]; static volatile uint32_t dma_enable_mask = 0; +#if MICROPY_HW_DMA_ENABLE_AUTO_TURN_OFF volatile dma_idle_count_t dma_idle; +#endif #define DMA_INVALID_CHANNEL 0xff // Value stored in dma_last_channel which means invalid @@ -1082,6 +1090,7 @@ void DMA2_Channel7_IRQHandler(void) { #endif +#if MICROPY_HW_DMA_ENABLE_AUTO_TURN_OFF static void dma_idle_handler(uint32_t tick); // Resets the idle counter for the DMA controller associated with dma_id. @@ -1089,6 +1098,7 @@ static void dma_tickle(dma_id_t dma_id) { dma_idle.counter[(dma_id < NSTREAMS_PER_CONTROLLER) ? 0 : 1] = 1; systick_enable_dispatch(SYSTICK_DISPATCH_DMA, dma_idle_handler); } +#endif static void dma_enable_clock(dma_id_t dma_id) { // We don't want dma_tick_handler() to turn off the clock right after we @@ -1143,7 +1153,9 @@ static void dma_disable_clock(dma_id_t dma_id) { // We just mark the clock as disabled here, but we don't actually disable it. // We wait for the timer to expire first, which means that back-to-back // transfers don't have to initialize as much. + #if MICROPY_HW_DMA_ENABLE_AUTO_TURN_OFF dma_tickle(dma_id); + #endif dma_enable_mask &= ~(1 << dma_id); } @@ -1250,6 +1262,7 @@ void dma_invalidate_channel(const dma_descr_t *dma_descr) { } } +#if MICROPY_HW_DMA_ENABLE_AUTO_TURN_OFF // Called from the SysTick handler // We use LSB of tick to select which controller to process static void dma_idle_handler(uint32_t tick) { @@ -1302,6 +1315,7 @@ static void dma_idle_handler(uint32_t tick) { } } } +#endif #if defined(STM32F0) || defined(STM32G4) || defined(STM32L0) || defined(STM32L4) |