ADC+I2S(DMA) conficts with "dac_output_enable": ADC reads 0x00 Values

[ESPI_1]

Using ADC+I2S alone works:
- Test: Simply Connect the ADC-Input to 3V3, and we got 0X0FFF in the Buffer as expected --> OK

BUG:
Simply adding the Line
"dac_output_enable(DAC_CHANNEL_1)"
somewere! in the Project - even after the test1,
then the test reads only 0X0000 from the ADC-via spi

seems to be a conflict in the Startup of the library
or some missing initialisation?

Code: [Select all] [Expand/Collapse]

1.  
2. #include <stdint.h>
3. #include "freertos/FreeRTOS.h"
4. #include "freertos/task.h"
5. #include "esp_log.h"
6.  
7. // DAC-Cosinus
8. #include "soc/rtc_io_reg.h" //Used by DAC-Sin
9. #include "soc/rtc_cntl_reg.h"
10. #include "soc/rtc.h"
11.  
12. #include "driver/i2s.h"
13. #include "driver/adc.h"
14. #include "driver/dac.h"
15. #include "esp_adc_cal.h"
16. #include <soc/syscon_reg.h>
17.  
18. #define TAG "MyTag"
19. #define EXAMPLE_I2S_ADC_CHANNEL     ADC1_CHANNEL_0 /*!< ADC1 channel 0 is GPIO36 (ESP32), GPIO1 (ESP32-S2) */
20. //Externaly  Connect GPIO36 to 3v3
21.  
22. void MyTask(void* arg)
23. {
24.     i2s_config_t i2s_config = {
25. //                  .mode = I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN | I2S_MODE_ADC_BUILT_IN,
26.                 .mode = I2S_MODE_MASTER | I2S_MODE_RX                                       | I2S_MODE_ADC_BUILT_IN,
27.        .sample_rate =  16000,
28.        .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
29.        .communication_format = I2S_COMM_FORMAT_I2S,
30.        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
31.        .intr_alloc_flags = 1,
32.        .dma_buf_count = 2,
33.        .dma_buf_len = 1024,
34.        .use_apll = 0,
35.     };
36.     adc1_config_channel_atten(EXAMPLE_I2S_ADC_CHANNEL, ADC_ATTEN_11db);
37.     adc1_config_width(ADC_WIDTH_BIT_12);
38.     i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
39.     i2s_set_adc_mode(ADC_UNIT_1, EXAMPLE_I2S_ADC_CHANNEL);
40.     i2s_adc_enable(I2S_NUM_0);
41.  
42.     const static size_t i2s_read_len = 1024;
43.     size_t    bytes_read;
44.     char*    i2s_read_buff    = (char*) calloc(i2s_read_len, sizeof(char));
45.  
46.     ESP_LOGI(TAG, "Test1: expect dump of 0X0FFF");
47.     i2s_read(EXAMPLE_I2S_NUM, (void*) i2s_read_buff, i2s_read_len, &bytes_read, portMAX_DELAY);
48.     if(bytes_read>0){
49.        ESP_LOG_BUFFER_HEXDUMP(TAG, i2s_read_buff, bytes_read, ESP_LOG_INFO );
50.     }
51.     vTaskDelay(2/portTICK_PERIOD_MS);
52.  
53.  
54.     dac_cosine_enable(DAC_CHANNEL_1);
55.    //********************* BUG BUG BUG BUG BUG ******************************************
56.    // Simply enabeling "dac_output_enable" in Project --> BOTH!!!  Test1 and Test2 will Fail( read only 0X0000)
57. #if 1
58.     ESP_LOGI(TAG, "dac_output_enable");
59.     dac_output_enable(DAC_CHANNEL_1);// GPIO25
60. #endif
61.  
62.  
63.     ESP_LOGI(TAG, "\nTest2:");
64.     i2s_read(EXAMPLE_I2S_NUM, (void*) i2s_read_buff, i2s_read_len, &bytes_read, portMAX_DELAY);
65.     if(bytes_read>0){
66.        ESP_LOG_BUFFER_HEXDUMP(TAG, i2s_read_buff, bytes_read, ESP_LOG_INFO );
67.     }
68.  
69.     while(1){
70.         vTaskDelay(2000/portTICK_PERIOD_MS);
71.     }//while
72. }
73.  
74.  
75. void  ADC_SPI_DAC_Init(){
76.      xTaskCreate(MyTask, "MyTask", 1024*3, NULL, 10, NULL);
77. }
78.  

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