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gdma: support reset dma fifo at runtime

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This commit is contained in:
morris
2021-03-22 21:58:04 +08:00
parent a20a51316c
commit 270ed70f3e
2 changed files with 32 additions and 0 deletions
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19
components/driver/gdma.c
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@@ -412,6 +412,25 @@ err:
return ret; return ret;
} }
esp_err_t gdma_reset(gdma_channel_handle_t dma_chan)
{
esp_err_t ret = ESP_OK;
gdma_pair_t *pair = NULL;
gdma_group_t *group = NULL;
ESP_GOTO_ON_FALSE(dma_chan, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
pair = dma_chan->pair;
group = pair->group;
if (dma_chan->direction == GDMA_CHANNEL_DIRECTION_RX) {
gdma_ll_rx_reset_channel(group->hal.dev, pair->pair_id);
} else {
gdma_ll_tx_reset_channel(group->hal.dev, pair->pair_id);
}
err:
return ret;
}
static void gdma_uninstall_group(gdma_group_t *group) static void gdma_uninstall_group(gdma_group_t *group)
{ {
int group_id = group->group_id; int group_id = group->group_id;

13
components/driver/include/esp_private/gdma.h
View File

@@ -155,6 +155,7 @@ esp_err_t gdma_new_channel(const gdma_channel_alloc_config_t *config, gdma_chann
* @brief Connect GDMA channel to trigger peripheral * @brief Connect GDMA channel to trigger peripheral
* *
* @note Suggest to use helper macro `GDMA_MAKE_TRIGGER` to construct parameter `trig_periph`. e.g. GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SHA,0) * @note Suggest to use helper macro `GDMA_MAKE_TRIGGER` to construct parameter `trig_periph`. e.g. GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SHA,0)
* @note Connecting to a peripheral will also reset the DMA FIFO and FSM automatically
* *
* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_channel` * @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_channel`
* @param[in] trig_periph GDMA trigger peripheral * @param[in] trig_periph GDMA trigger peripheral
@@ -279,6 +280,18 @@ esp_err_t gdma_stop(gdma_channel_handle_t dma_chan);
*/ */
esp_err_t gdma_append(gdma_channel_handle_t dma_chan); esp_err_t gdma_append(gdma_channel_handle_t dma_chan);
/**
* @brief Reset DMA channel FIFO and internal finite state machine
* @note Resetting a DMA channel won't break the connection with the target peripheral
*
* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_channel`
* @return
* - ESP_OK: DMA channel reset successfully
* - ESP_ERR_INVALID_ARG: DMA channel reset failed due to invalid arguments
* - ESP_FAIL: DMA channel reset failed due to other errors
*/
esp_err_t gdma_reset(gdma_channel_handle_t dma_chan);
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif