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Merge branch 'feature/i2s_tx_descriptor_auto_clear' into 'master'

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i2s: add (optional) support to clear tx descriptor in underflow case

See merge request idf/esp-idf!2397
This commit is contained in:
Angus Gratton 2018-11-27 13:45:51 +08:00
commit 81231fcc4b
4 changed files with 15 additions and 4 deletions
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8
components/driver/i2s.c
View File

@ -86,6 +86,7 @@ typedef struct {
i2s_mode_t mode; /*!< I2S Working mode*/
uint32_t sample_rate; /*!< I2S sample rate */
bool use_apll; /*!< I2S use APLL clock */
bool tx_desc_auto_clear; /*!< I2S auto clear tx descriptor on underflow */
int fixed_mclk; /*!< I2S fixed MLCK clock */
} i2s_obj_t;
@ -502,6 +503,12 @@ static void IRAM_ATTR i2s_intr_handler_default(void *arg)
// All buffers are empty. This means we have an underflow on our hands.
if (xQueueIsQueueFullFromISR(p_i2s->tx->queue)) {
xQueueReceiveFromISR(p_i2s->tx->queue, &dummy, &high_priority_task_awoken);
// See if tx descriptor needs to be auto cleared:
// This will avoid any kind of noise that may get introduced due to transmission
// of previous data from tx descriptor on I2S line.
if (p_i2s->tx_desc_auto_clear == true) {
memset((void *) dummy, 0, p_i2s->tx->buf_size);
}
}
xQueueSendFromISR(p_i2s->tx->queue, (void*)(&finish_desc->buf), &high_priority_task_awoken);
if (p_i2s->i2s_queue) {
@ -991,6 +998,7 @@ static esp_err_t i2s_param_config(i2s_port_t i2s_num, const i2s_config_t *i2s_co
}
p_i2s_obj[i2s_num]->use_apll = i2s_config->use_apll;
p_i2s_obj[i2s_num]->tx_desc_auto_clear = i2s_config->tx_desc_auto_clear;
p_i2s_obj[i2s_num]->fixed_mclk = i2s_config->fixed_mclk;
return ESP_OK;
}

1
components/driver/include/driver/i2s.h
View File

@ -139,6 +139,7 @@ typedef struct {
int dma_buf_count; /*!< I2S DMA Buffer Count */
int dma_buf_len; /*!< I2S DMA Buffer Length */
bool use_apll; /*!< I2S using APLL as main I2S clock, enable it to get accurate clock */
bool tx_desc_auto_clear; /*!< I2S auto clear tx descriptor if there is underflow condition (helps in avoiding noise in case of data unavailability) */
int fixed_mclk; /*!< I2S using fixed MCLK output. If use_apll = true and fixed_mclk > 0, then the clock output for i2s is fixed and equal to the fixed_mclk value.*/
} i2s_config_t;

5
examples/bluetooth/a2dp_gatts_coex/main/main.c
View File

@ -650,8 +650,9 @@ void app_main()
.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT, //2-channels
.communication_format = I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB,
.dma_buf_count = 6,
.dma_buf_len = 60, //
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1 //Interrupt level 1
.dma_buf_len = 60,
.intr_alloc_flags = 0, //Default interrupt priority
.tx_desc_auto_clear = true //Auto clear tx descriptor on underflow
};

5
examples/bluetooth/a2dp_sink/main/main.c
View File

@ -63,8 +63,9 @@ void app_main()
.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT, //2-channels
.communication_format = I2S_COMM_FORMAT_I2S_MSB,
.dma_buf_count = 6,
.dma_buf_len = 60, //
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1 //Interrupt level 1
.dma_buf_len = 60,
.intr_alloc_flags = 0, //Default interrupt priority
.tx_desc_auto_clear = true //Auto clear tx descriptor on underflow
};