resistor switching

.gitignore

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+.cache
+build

CMakeLists.txt

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+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(power_profiler)

main/CMakeLists.txt

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+idf_component_register(SRCS "power_profiler.c" "resistor_ranges.c"
+                    INCLUDE_DIRS "."
+                    REQUIRES "driver")

main/power_profiler.c

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+#include <stdio.h>
+
+#include "driver/gpio.h"
+#include "esp_log.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/portmacro.h"
+
+#include "resistor_ranges.h"
+
+#define TAG "main"
+
+enum ranges {R1, R10, R100, R_NUM};
+
+resistor_range ranges[] = {
+  [R1] = {
+    .pin = GPIO_NUM_6,
+    .resistance = 1,
+  },
+  [R10] = {
+    .pin = GPIO_NUM_7,
+    .resistance = 10,
+  },
+  [R100] = {
+    .pin = GPIO_NUM_NC,
+    .resistance = 100,
+  },
+};
+
+unsigned int r_ind = 0;
+
+void app_main(void){
+  set_resistor_gpio(ranges, R100);
+  
+  while(1){
+    ESP_LOGI(TAG, "RANGE : %d", r_ind);
+    activate_range(ranges, r_ind, R100);
+    vTaskDelay(5000 / portTICK_PERIOD_MS);
+    r_ind = (r_ind + 1) % R_NUM;
+  }
+}

main/resistor_ranges.c

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+#include "driver/gpio.h"
+
+#include "hal/gpio_types.h"
+#include "esp_log.h"
+
+#include "resistor_ranges.h"
+
+// set all required pins as output
+void set_resistor_gpio(resistor_range ranges[], int range_num){
+  uint64_t pin_mask = 0;
+  for(int i = 0; i < range_num; i++){
+    pin_mask |= 1ULL << ranges[i].pin;
+  }
+
+  gpio_config_t conf = {
+    .intr_type = GPIO_INTR_DISABLE,
+    .mode = GPIO_MODE_OUTPUT,
+    .pin_bit_mask = pin_mask,
+    .pull_down_en = 0,
+    .pull_up_en = 0,
+  };
+  ESP_ERROR_CHECK(gpio_config(&conf));
+}
+
+
+void activate_range(resistor_range ranges[], int index, int range_num){
+  for(int i = 0; i < range_num; i++){
+    ESP_LOGI("RES_RANGE", "%d %d", ranges[i].pin, i==index);
+    ESP_ERROR_CHECK(gpio_set_level(ranges[i].pin, i == index));
+  }
+}

main/resistor_ranges.h

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+#include "hal/gpio_types.h"
+
+typedef struct {
+  gpio_num_t pin;
+  unsigned int resistance; // milliohm
+} resistor_range;
+
+void set_resistor_gpio(resistor_range ranges[], int range_num);
+void activate_range(resistor_range ranges[], int index, int range_num);