Mercurial > co2meter / file comparison

comparison: main/task_adc.c

main/task_adc.c

changeset 0
88d965579617
child 12
7dc9003f86a8
equal deleted inserted replaced
-1:000000000000 0:88d965579617
1 /**
2 * @file task_adc.c
3 * @brief The FreeRTOS task to query the pressure sensors on ADC inputs.
4 * The task will update the ADC_State structure.
5 */
6
7
8 #include "config.h"
9
10
11 #define DEFAULT_VREF 1093 ///< Use adc2_vref_to_gpio() to obtain a better estimate
12 #define NO_OF_SAMPLES 64 ///< Multisampling
13
14
15 #define PRESSURE_1 (CONFIG_PRESSURE_1)
16 #define PRESSURE_2 (CONFIG_PRESSURE_2)
17 #define PRESSURE_3 (CONFIG_PRESSURE_3)
18 #define BATT_CHANNEL (CONFIG_BATT_CHANNEL)
19 #define BATT_ACTOR (CONFIG_BATT_ACTOR)
20
21
22 static const char *TAG = "task_adc";
23
24 SemaphoreHandle_t xSemaphoreADC = NULL; ///< Semaphire ADC task
25 EventGroupHandle_t xEventGroupADC; ///< Events ADC task
26 ADC_State *adc_state; ///< Public state for other tasks
27
28 const int TASK_ADC_REQUEST_PRESSURE = BIT0; ///< Request temperature measurements
29 const int TASK_ADC_REQUEST_DONE = BIT1; ///< Request is completed
30
31
32
33 void request_adc(void)
34 {
35 xEventGroupClearBits(xEventGroupADC, TASK_ADC_REQUEST_DONE);
36 xEventGroupSetBits(xEventGroupADC, TASK_ADC_REQUEST_PRESSURE);
37 }
38
39
40
41 bool ready_adc(void)
42 {
43 if (xEventGroupGetBits(xEventGroupADC) & TASK_ADC_REQUEST_DONE)
44 return true;
45 return false;
46 }
47
48
49 /*
50 static void print_char_val_type(esp_adc_cal_value_t val_type)
51 {
52 if (val_type == ESP_ADC_CAL_VAL_EFUSE_TP) {
53 ESP_LOGI(TAG, "Characterized using Two Point Value");
54 } else if (val_type == ESP_ADC_CAL_VAL_EFUSE_VREF) {
55 ESP_LOGI(TAG, "Characterized using eFuse Vref");
56 } else {
57 ESP_LOGI(TAG, "Characterized using Default Vref");
58 }
59 }
60 */
61
62
63 /*
64 * Task to read pressure sensors and battery voltage on request.
65 */
66 void task_adc(void *pvParameter)
67 {
68 int i, adc_reading;
69 adc_atten_t atten = ADC_ATTEN_DB_0;
70
71 ESP_LOGI(TAG, "Starting task ADC sensors");
72 // esp_log_level_set("task_adc", ESP_LOG_DEBUG);
73
74 //Check TP is burned into eFuse
75 // ESP_LOGI(TAG, "eFuse Two Point: %supported", (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_TP) == ESP_OK) ? "S":"NOT s");
76 //Check Vref is burned into eFuse
77 // ESP_LOGI(TAG, "eFuse Vref: %supported", (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_VREF) == ESP_OK) ? "S":"NOT s");
78
79 adc_state = malloc(sizeof(ADC_State));
80 for (i = 0; i < 3; i++) {
81 adc_state->Pressure[i].valid = false;
82 // adc_state->Pressure[i].atten = ADC_ATTEN_DB_2_5; // Optimal 100..1250 mV, max 1500 mV. max 4,5 bar.
83 adc_state->Pressure[i].atten = ADC_ATTEN_DB_6; // Optimal 150..1750 mV, max 2200 mV, max 6,3 bar.
84 adc_state->Pressure[i].voltage = 0;
85 adc_state->Pressure[i].error = ADC_ERR_NONE;
86 }
87 adc_state->Pressure[0].channel = PRESSURE_1;
88 adc_state->Pressure[1].channel = PRESSURE_2;
89 adc_state->Pressure[2].channel = PRESSURE_3;
90 adc_state->Batt_voltage = 0;
91 adc_state->Batt_error = ADC_ERR_NONE;
92
93 //Characterize ADC
94 esp_adc_cal_characteristics_t *adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));
95 // esp_adc_cal_value_t val_type = esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_6, ADC_WIDTH_BIT_11, DEFAULT_VREF, adc_chars);
96 // print_char_val_type(val_type);
97
98 /* event handler and event group for this task */
99 xEventGroupADC = xEventGroupCreate();
100 EventBits_t uxBits;
101
102 /*
103 * Task loop forever.
104 */
105 while (1) {
106
107 uxBits = xEventGroupWaitBits(xEventGroupADC, TASK_ADC_REQUEST_PRESSURE, pdFALSE, pdFALSE, portMAX_DELAY );
108
109 if (uxBits & TASK_ADC_REQUEST_PRESSURE) {
110
111 adc1_config_width(ADC_WIDTH_BIT_11);
112
113 for (i = 0; i < 3; i++) {
114 adc_reading = 0;
115 atten = ADC_ATTEN_DB_0;
116
117 /*
118 * Autoranging the ADC conversion
119 */
120 while (1) {
121 esp_adc_cal_characterize(ADC_UNIT_1, atten, ADC_WIDTH_BIT_11, DEFAULT_VREF, adc_chars);
122 adc1_config_channel_atten((adc1_channel_t)adc_state->Pressure[i].channel, atten);
123 int raw = adc1_get_raw((adc1_channel_t)adc_state->Pressure[i].channel);
124 // printf("raw: %d atten: %d\n", raw, atten);
125 // if (raw < 3400)
126 // break;
127
128 if (atten == ADC_ATTEN_DB_0 && raw > 1850)
129 atten = ADC_ATTEN_DB_2_5;
130 else if (atten == ADC_ATTEN_DB_2_5 && raw > 1850)
131 atten = ADC_ATTEN_DB_6;
132 else if (atten == ADC_ATTEN_DB_6 && raw > 1850)
133 atten = ADC_ATTEN_DB_11;
134 else
135 break;
136 }
137
138 /*
139 * Now that he have the best attenuation, multisample the real value.
140 */
141 for (int j = 0; j < NO_OF_SAMPLES; j++) {
142 int tmp = adc1_get_raw((adc1_channel_t)adc_state->Pressure[i].channel);
143 adc_reading += tmp;
144 // printf("%4d ", tmp);
145 //adc_reading += adc1_get_raw((adc1_channel_t)adc_state->Pressure[i].channel);
146 }
147 // printf("\n");
148 if (adc_reading < 0) {
149 adc_state->Pressure[i].error = ADC_ERR_READ;
150 adc_state->Pressure[i].voltage = 0;
151 } else {
152 adc_reading /= NO_OF_SAMPLES;
153 if (xSemaphoreTake(xSemaphoreADC, 25) == pdTRUE) {
154 adc_state->Pressure[i].voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_chars); // voltage in mV
155 adc_state->Pressure[i].error = ADC_ERR_NONE;
156 xSemaphoreGive(xSemaphoreADC);
157 }
158 }
159 ESP_LOGI(TAG, "Pressure %d raw: %4d, atten: %d, %.3f volt, error: %d",
160 i, adc_reading, atten, adc_state->Pressure[i].voltage / 1000.0, adc_state->Pressure[i].error);
161 }
162
163 adc_reading = 0;
164 atten = ADC_ATTEN_DB_6; // Don't use DB_11, it has a bad linearity.
165 esp_adc_cal_characterize(ADC_UNIT_1, atten, ADC_WIDTH_BIT_11, DEFAULT_VREF, adc_chars);
166 adc1_config_channel_atten((adc1_channel_t)BATT_CHANNEL, atten);
167 for (int j = 0; j < NO_OF_SAMPLES; j++) {
168 adc_reading += adc1_get_raw((adc1_channel_t)BATT_CHANNEL);
169 }
170
171 if (adc_reading < 0) {
172 adc_state->Batt_voltage = 0;
173 adc_state->Batt_error = ADC_ERR_READ;
174 } else {
175 adc_reading /= NO_OF_SAMPLES;
176 if (xSemaphoreTake(xSemaphoreADC, 25) == pdTRUE) {
177 adc_state->Batt_voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_chars) * 2; // Chip supply voltage in mV
178 adc_state->Batt_error = ADC_ERR_NONE;
179 xSemaphoreGive(xSemaphoreADC);
180 }
181 }
182
183 xEventGroupClearBits(xEventGroupADC, TASK_ADC_REQUEST_PRESSURE);
184 xEventGroupSetBits(xEventGroupADC, TASK_ADC_REQUEST_DONE);
185 #if 1
186 ESP_LOGI(TAG, "Battery raw: %4d, atten: %d %.3f volt, error: %d", adc_reading, atten, adc_state->Batt_voltage / 1000.0, adc_state->Batt_error);
187 #endif
188 }
189 vTaskDelay( (TickType_t)10);
190 }
191 }
192

Mercurial Repository: co2meter

mercurial