adc: reduce latency

Author: TDA-2030

Firmware/FFBoard/Src/cppmain.cpp

@@ -130,7 +130,7 @@ unsigned long getRunTimeCounterValue(void){
 	return micros();
 }
 
-#else
+#else // For HW_ESP32S2
 static const char *TAG = "cppmain";
 void cppmain()
 {
@@ -164,7 +164,7 @@ void cppmain()
         updateLeds();
         //external_spi.process();
         // taskYIELD(); // Change task if higher priority task wants to run
-        vTaskDelay(pdMS_TO_TICKS(10));
+        vTaskDelay(1);
         // ESP_LOGI(TAG, "run");
     }
 }

Firmware/Targets/ESP32S2/main/glue.c

@@ -404,7 +404,7 @@ static void continuous_adc_init(uint16_t adc1_chan_mask, uint16_t adc2_chan_mask
 {
 #define GET_UNIT(x)        ((x>>3) & 0x1)
     adc_digi_init_config_t adc_dma_config = {
-        .max_store_buf_size = 1024,
+        .max_store_buf_size = channel_num * 4 * 2,
         .conv_num_each_intr = channel_num * 4 * 2,
         .adc1_chan_mask = adc1_chan_mask,
         .adc2_chan_mask = adc2_chan_mask,
@@ -413,8 +413,8 @@ static void continuous_adc_init(uint16_t adc1_chan_mask, uint16_t adc2_chan_mask
 
     adc_digi_configuration_t dig_cfg = {
         .conv_limit_en = 0,
-        .conv_limit_num = 250,
-        .sample_freq_hz = 2 * 1000,
+        .conv_limit_num = adc_dma_config.conv_num_each_intr,
+        .sample_freq_hz = 1 * 1000,
         .conv_mode = ADC_CONV_SINGLE_UNIT_1,
         .format = ADC_DIGI_OUTPUT_FORMAT_TYPE1,
     };
@@ -452,7 +452,9 @@ HAL_StatusTypeDef HAL_ADC_Start_DMA(ADC_HandleTypeDef *hadc, uint32_t *pData, ui
     // while (1)
     // {
     //     uint8_t c=0;
-    //     getAnalogBuffer(NULL, &c);
+    //     uint32_t *p = getAnalogBuffer(NULL, &c);
+    //     ESP_LOGI(TAG, "%d, %d, %d", p[0], p[1], p[2]);
+    //     vTaskDelay(10);
     // }
 
     return HAL_OK;