ESP32S2和S3 ADC采样速率的问题

[xinhaojie]

咨询一下，ESP32S2和S3中的RTC ADC和DIG ADC的最大采样速率和 ESP32的一样吗，是RTC 200KHz， DIG 2MHz吗？，我看手册上S2和S3对最大速率均未描述。

[Kevin_WWW]

我开了一个新Task计数，DMA ADC每秒采6400次

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1. #include <string.h>
2. #include <stdio.h>
3. #include "sdkconfig.h"
4. #include "esp_log.h"
5. #include "freertos/FreeRTOS.h"
6. #include "freertos/task.h"
7. #include "freertos/semphr.h"
8. #include "driver/adc.h"
9.  
10. #define TIMES 256
11. #define GET_UNIT(x) ((x >> 3) & 0x1)
12.  
13. #define ADC_RESULT_BYTE 4
14. #define ADC_CONV_LIMIT_EN 0
15. #define ADC_CONV_MODE ADC_CONV_ALTER_UNIT
16. #define ADC_OUTPUT_TYPE ADC_DIGI_OUTPUT_FORMAT_TYPE2
17.  
18. static uint16_t adc1_chan_mask = BIT(2) | BIT(3) | BIT(4);
19. static uint16_t adc2_chan_mask = BIT(0);
20. static adc_channel_t channel[4] = {ADC1_CHANNEL_2, ADC1_CHANNEL_3, ADC1_CHANNEL_4, (ADC2_CHANNEL_0 | 1 << 3)};
21.  
22. static const char *TAG = "ADC DMA";
23. int value_channel_2[1100] = {0};
24. int value_channel_3[1100] = {0};
25. int value_channel_4[1100] = {0};
26. int index_channel_2 = 0;
27. int index_channel_3 = 0;
28. int index_channel_4 = 0;
29. int sum_temp = 0;
30.  
31. int countNum = 0;
32.  
33. static void
34. continuous_adc_init(uint16_t adc1_chan_mask, uint16_t adc2_chan_mask, adc_channel_t *channel, uint8_t channel_num)
35. {
36.     adc_digi_init_config_t adc_dma_config = {
37.         .max_store_buf_size = 1024,
38.         .conv_num_each_intr = TIMES,
39.         .adc1_chan_mask = adc1_chan_mask,
40.         .adc2_chan_mask = adc2_chan_mask,
41.     };
42.     ESP_ERROR_CHECK(adc_digi_initialize(&adc_dma_config));
43.  
44.     adc_digi_configuration_t dig_cfg = {
45.         .conv_limit_en = ADC_CONV_LIMIT_EN,
46.         .conv_limit_num = 250,
47.         .sample_freq_hz = 10 * 1000,
48.         .conv_mode = ADC_CONV_MODE,
49.         .format = ADC_OUTPUT_TYPE,
50.     };
51.  
52.     adc_digi_pattern_config_t adc_pattern[SOC_ADC_PATT_LEN_MAX] = {0};
53.     dig_cfg.pattern_num = channel_num;
54.     for (int i = 0; i < channel_num; i++)
55.     {
56.         uint8_t unit = GET_UNIT(channel[i]);
57.         uint8_t ch = channel[i] & 0x7;
58.         adc_pattern[i].atten = ADC_ATTEN_DB_11;
59.         adc_pattern[i].channel = ch;
60.         adc_pattern[i].unit = unit;
61.         adc_pattern[i].bit_width = SOC_ADC_DIGI_MAX_BITWIDTH;
62.  
63.         ESP_LOGI(TAG, "adc_pattern[%d].atten is :%x", i, adc_pattern[i].atten);
64.         ESP_LOGI(TAG, "adc_pattern[%d].channel is :%x", i, adc_pattern[i].channel);
65.         ESP_LOGI(TAG, "adc_pattern[%d].unit is :%x", i, adc_pattern[i].unit);
66.     }
67.     dig_cfg.adc_pattern = adc_pattern;
68.     ESP_ERROR_CHECK(adc_digi_controller_configure(&dig_cfg));
69. }
70.  
71. #if !CONFIG_IDF_TARGET_ESP32
72.  
73. static bool check_valid_data(const adc_digi_output_data_t *data)
74. {
75.     const unsigned int unit = data->type2.unit;
76.     if (unit > 2)
77.         return false;
78.     if (data->type2.channel >= SOC_ADC_CHANNEL_NUM(unit))
79.         return false;
80.  
81.     return true;
82. }
83.  
84. #endif
85.  
86. void LOG_ADV_VALUE(int index_channel, const int *value_channel, char * LOG_TAG)
87. {
88.     // for (int i = 0; i < index_channel; ++i)
89.     // { sum_temp += value_channel[i]; }
90.     // ESP_LOGI(LOG_TAG, "%d", (int)(sum_temp / index_channel));
91.     ESP_LOGI(LOG_TAG, "%d", value_channel[1]);
92.     sum_temp = 0;
93. }
94.  
95. void clearTask(void *param)
96. {
97.     while (1)
98.     {
99.         vTaskDelay(250 / portTICK_PERIOD_MS);
100.         LOG_ADV_VALUE(index_channel_2, value_channel_2,"channel 2 adv value");
101.         LOG_ADV_VALUE(index_channel_3, value_channel_3,"channel 3 adv value");
102.         LOG_ADV_VALUE(index_channel_4, value_channel_4,"channel 4 adv value");
103.  
104.         index_channel_2 = 0;
105.         index_channel_3 = 0;
106.         index_channel_4 = 0;
107.     }
108. }
109.  
110. void countTask(void *param)
111. {
112.     while (1)
113.     {
114.         vTaskDelay(1000 / portTICK_PERIOD_MS);
115.         printf("count=%d\n", countNum);
116.         countNum = 0;
117.     }
118. }
119.  
120. void app_main(void)
121. {
122.     xTaskCreate(clearTask, "clearTask", 1024 * 5, NULL, 1, NULL);
123.     xTaskCreate(countTask, "countTask", 1024 * 5, NULL, 2, NULL);
124.     continuous_adc_init(adc1_chan_mask, adc2_chan_mask, channel, sizeof(channel) / sizeof(adc_channel_t));
125.     adc_digi_start();
126.     uint32_t ret_num = 0;
127.     uint8_t result[TIMES] = {0};
128.     memset(result, 0xcc, TIMES);
129.     while (1)
130.     {
131.         adc_digi_read_bytes(result, TIMES, &ret_num, ADC_MAX_DELAY);
132.         for (int i = 0; i < ret_num; i += ADC_RESULT_BYTE)
133.         {
134.             adc_digi_output_data_t *p = (void *)&result[i];
135.             if (check_valid_data(p))
136.             {
137.                 if (((p->type2.unit + 1) == 1) || (p->type2.channel >= 2) || (p->type2.channel <= 4))
138.                 {
139.                     // ESP_LOGI(TAG, "Unit: %d,_Channel: %d, Value: %d", p->type2.unit + 1, p->type2.channel,
140.                     //          p->type2.data);
141.                     countNum++;
142.                     switch (p->type2.channel)
143.                     {
144.                     case 2:
145.                         value_channel_2[index_channel_2] = p->type2.data;
146.                         index_channel_2++;
147.                         break;
148.                     case 3:
149.                         value_channel_3[index_channel_3] = p->type2.data;
150.                         index_channel_3++;
151.                         break;
152.                     case 4:
153.                         value_channel_4[index_channel_4] = p->type2.data;
154.                         index_channel_4++;
155.                         break;
156.                     }
157.                 }
158.             }
159.         }
160.         vTaskDelay(1);
161.     }
162. }
163.  
164.  

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