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stm32/dma: Add option to disable auto-DMA-turn-off.

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Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2022-03-17 17:09:28 +11:00
parent 63c7593df6
commit f0be0de341
1 changed files with 14 additions and 0 deletions
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14
ports/stm32/dma.c
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@ -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)