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| 1 | +// Waveshare LCD Touch 2 implmentation |
| 2 | +// |
| 3 | +#include "esp_err.h" |
| 4 | +#include "freertos/idf_additions.h" |
| 5 | +#include "hal/adc_types.h" |
| 6 | +#include "hal/gpio_types.h" |
| 7 | +#include "iot_button.h" |
| 8 | +#include "power.h" |
| 9 | +#include "sdkconfig.h" |
| 10 | +#include "soc/gpio_num.h" |
| 11 | +#include <button_gpio.h> |
| 12 | +#include <driver/gpio.h> |
| 13 | +#include <driver/ledc.h> |
| 14 | +#include <esp_adc/adc_cali.h> |
| 15 | +#include <esp_adc/adc_cali_scheme.h> |
| 16 | +#include <esp_adc/adc_oneshot.h> |
| 17 | +#include <esp_sleep.h> |
| 18 | + |
| 19 | +#define BATTERY_ADC_CHANNEL ADC_CHANNEL_4 |
| 20 | +#define ADC_ATTEN ADC_ATTEN_DB_12 |
| 21 | + |
| 22 | +#define LCD_BL_LEDC_TIMER LEDC_TIMER_0 |
| 23 | +#define LCD_BL_LEDC_MODE LEDC_LOW_SPEED_MODE |
| 24 | + |
| 25 | +#define LCD_BL_LEDC_CHANNEL LEDC_CHANNEL_0 |
| 26 | +#define LCD_BL_LEDC_DUTY_RES LEDC_TIMER_10_BIT |
| 27 | +#define LCD_BL_LEDC_DUTY (1024) |
| 28 | +#define LCD_BL_LEDC_FREQUENCY (10000) |
| 29 | + |
| 30 | +static adc_oneshot_unit_handle_t adc1_handle = NULL; |
| 31 | +adc_cali_handle_t adc1_cali_chan0_handle = NULL; |
| 32 | + |
| 33 | +const float ema_alpha = 0.3; // Estimated moving average smoothing factor |
| 34 | +int ema_voltage = 0; |
| 35 | + |
| 36 | +void brightness_init(void) |
| 37 | +{ |
| 38 | + gpio_set_direction(CONFIG_DISPLAY_PIN_BL, GPIO_MODE_OUTPUT); |
| 39 | + gpio_set_level(CONFIG_DISPLAY_PIN_BL, 1); |
| 40 | + |
| 41 | + ledc_timer_config_t ledc_timer = { .speed_mode = LCD_BL_LEDC_MODE, |
| 42 | + .timer_num = LCD_BL_LEDC_TIMER, |
| 43 | + .duty_resolution = LCD_BL_LEDC_DUTY_RES, |
| 44 | + .freq_hz = LCD_BL_LEDC_FREQUENCY, // Set output frequency at 5 kHz |
| 45 | + .clk_cfg = LEDC_AUTO_CLK }; |
| 46 | + ESP_ERROR_CHECK(ledc_timer_config(&ledc_timer)); |
| 47 | + |
| 48 | + ledc_channel_config_t ledc_channel = { .speed_mode = LCD_BL_LEDC_MODE, |
| 49 | + .channel = LCD_BL_LEDC_CHANNEL, |
| 50 | + .timer_sel = LCD_BL_LEDC_TIMER, |
| 51 | + .intr_type = LEDC_INTR_DISABLE, |
| 52 | + .gpio_num = CONFIG_DISPLAY_PIN_BL, |
| 53 | + .duty = 0, // Set duty to 0% |
| 54 | + .hpoint = 0 }; |
| 55 | + ESP_ERROR_CHECK(ledc_channel_config(&ledc_channel)); |
| 56 | +} |
| 57 | + |
| 58 | +static void button_shutdown(void* arg, void* ctx) |
| 59 | +{ |
| 60 | + power_backlight_off(); |
| 61 | + while (gpio_get_level(GPIO_NUM_0) == 0) { |
| 62 | + vTaskDelay(pdMS_TO_TICKS(10)); |
| 63 | + } |
| 64 | + power_shutdown(); |
| 65 | +} |
| 66 | + |
| 67 | +void boot_button_init(void) |
| 68 | +{ |
| 69 | + const button_config_t btn_cfg = { |
| 70 | + .long_press_time = CONFIG_BUTTON_LONG_PRESS_TIME_MS, |
| 71 | + .short_press_time = CONFIG_BUTTON_SHORT_PRESS_TIME_MS, |
| 72 | + }; |
| 73 | + |
| 74 | + const button_gpio_config_t btn_gpio_cfg = { |
| 75 | + .gpio_num = 0, |
| 76 | + .active_level = 0, |
| 77 | + }; |
| 78 | + |
| 79 | + button_handle_t btn_handle = NULL; |
| 80 | + ESP_ERROR_CHECK(iot_button_new_gpio_device(&btn_cfg, &btn_gpio_cfg, &btn_handle)); |
| 81 | + |
| 82 | + JADE_ASSERT(btn_handle); |
| 83 | + |
| 84 | + ESP_ERROR_CHECK(iot_button_register_cb(btn_handle, BUTTON_LONG_PRESS_HOLD, NULL, button_shutdown, NULL)); |
| 85 | + |
| 86 | + esp_sleep_disable_wakeup_source(ESP_SLEEP_WAKEUP_ALL); |
| 87 | + gpio_hold_en(GPIO_NUM_0); |
| 88 | + gpio_deep_sleep_hold_en(); |
| 89 | + esp_sleep_enable_ext0_wakeup(GPIO_NUM_0, 0); |
| 90 | +} |
| 91 | + |
| 92 | +esp_err_t power_init(void) |
| 93 | +{ |
| 94 | + // Use the BOOT button as a sleep/wakeup button |
| 95 | + boot_button_init(); |
| 96 | + |
| 97 | + // Initialise backlight brightness |
| 98 | + brightness_init(); |
| 99 | + |
| 100 | + // Initialise the ADC to measure battery level |
| 101 | + adc_oneshot_unit_init_cfg_t init_config1 = { |
| 102 | + .unit_id = ADC_UNIT_1, |
| 103 | + }; |
| 104 | + ESP_ERROR_CHECK(adc_oneshot_new_unit(&init_config1, &adc1_handle)); |
| 105 | + JADE_ASSERT(adc1_handle); |
| 106 | + |
| 107 | + adc_oneshot_chan_cfg_t config = { |
| 108 | + .bitwidth = ADC_BITWIDTH_DEFAULT, |
| 109 | + .atten = ADC_ATTEN_DB_12, |
| 110 | + }; |
| 111 | + ESP_ERROR_CHECK(adc_oneshot_config_channel(adc1_handle, BATTERY_ADC_CHANNEL, &config)); |
| 112 | + |
| 113 | + // Use voltage calibration |
| 114 | + adc_cali_curve_fitting_config_t cali_config = { |
| 115 | + .unit_id = ADC_UNIT_1, |
| 116 | + .atten = ADC_ATTEN, |
| 117 | + .bitwidth = ADC_BITWIDTH_DEFAULT, |
| 118 | + }; |
| 119 | + if (adc_cali_create_scheme_curve_fitting(&cali_config, &adc1_cali_chan0_handle) != ESP_OK) { |
| 120 | + JADE_LOGW("ADC calibration not available, continuing without it"); |
| 121 | + adc1_cali_chan0_handle = NULL; |
| 122 | + } |
| 123 | + |
| 124 | + return ESP_OK; |
| 125 | +} |
| 126 | + |
| 127 | +esp_err_t power_shutdown(void) { esp_deep_sleep_start(); } |
| 128 | + |
| 129 | +esp_err_t power_screen_on(void) { return ESP_OK; } |
| 130 | +esp_err_t power_screen_off(void) { return ESP_OK; } |
| 131 | + |
| 132 | +esp_err_t power_backlight_on(const uint8_t brightness) |
| 133 | +{ |
| 134 | + uint32_t new_brightness = brightness * 20; |
| 135 | + if (new_brightness > 100) { |
| 136 | + return ESP_OK; |
| 137 | + } |
| 138 | + |
| 139 | + uint32_t duty = (new_brightness * (LCD_BL_LEDC_DUTY - 1)) / 100; |
| 140 | + ESP_ERROR_CHECK(ledc_set_duty(LCD_BL_LEDC_MODE, LCD_BL_LEDC_CHANNEL, duty)); |
| 141 | + ESP_ERROR_CHECK(ledc_update_duty(LCD_BL_LEDC_MODE, LCD_BL_LEDC_CHANNEL)); |
| 142 | + |
| 143 | + return ESP_OK; |
| 144 | +} |
| 145 | + |
| 146 | +esp_err_t power_backlight_off(void) |
| 147 | +{ |
| 148 | + ESP_ERROR_CHECK(ledc_set_duty(LCD_BL_LEDC_MODE, LCD_BL_LEDC_CHANNEL, 0)); |
| 149 | + ESP_ERROR_CHECK(ledc_update_duty(LCD_BL_LEDC_MODE, LCD_BL_LEDC_CHANNEL)); |
| 150 | + |
| 151 | + return ESP_OK; |
| 152 | +} |
| 153 | + |
| 154 | +esp_err_t power_camera_on(void) { return ESP_OK; } |
| 155 | +esp_err_t power_camera_off(void) { return ESP_OK; } |
| 156 | + |
| 157 | +uint16_t power_get_vbat(void) |
| 158 | +{ |
| 159 | + JADE_ASSERT(adc1_handle); |
| 160 | + int raw_adc = 0; |
| 161 | + int voltage; |
| 162 | + ESP_ERROR_CHECK(adc_oneshot_read(adc1_handle, BATTERY_ADC_CHANNEL, &raw_adc)); |
| 163 | + |
| 164 | + if (adc1_cali_chan0_handle) { |
| 165 | + adc_cali_raw_to_voltage(adc1_cali_chan0_handle, raw_adc, &voltage); |
| 166 | + } else { |
| 167 | + voltage = (raw_adc * 3300) / 4095; // mV |
| 168 | + } |
| 169 | + |
| 170 | + // apply Estimated Moving Average since the ADC seems to have a lot of noise |
| 171 | + ema_voltage = ema_alpha * voltage + (1 - ema_alpha) * (ema_voltage == 0 ? voltage : ema_voltage); |
| 172 | + /* JADE_LOGI("Raw: %.2dmV, Smoothed: %.2d mV", voltage, ema_voltage); */ |
| 173 | + return (uint16_t)ema_voltage; |
| 174 | +} |
| 175 | + |
| 176 | +uint8_t power_get_battery_status(void) |
| 177 | +{ |
| 178 | + int vbat = power_get_vbat() * 3; // apply voltage divider |
| 179 | + if (vbat < 3000) |
| 180 | + return 0; |
| 181 | + else if (vbat < 3200) |
| 182 | + return 1; |
| 183 | + else if (vbat < 3400) |
| 184 | + return 2; |
| 185 | + else if (vbat < 3600) |
| 186 | + return 3; |
| 187 | + else if (vbat < 3800) |
| 188 | + return 4; |
| 189 | + else |
| 190 | + return 5; |
| 191 | +} |
| 192 | + |
| 193 | +// The STAT pin on the charging IC isn't exposed to a GPIO so we cannot read it |
| 194 | +// and can't easily tap it with a wire. There is a charging LED though so you |
| 195 | +// can see if the battery is being charged. |
| 196 | +bool power_get_battery_charging(void) { return 0; } |
| 197 | +uint16_t power_get_ibat_charge(void) { return 0; } |
| 198 | +uint16_t power_get_ibat_discharge(void) { return 0; } |
| 199 | +uint16_t power_get_vusb(void) { return 0; } |
| 200 | +uint16_t power_get_iusb(void) { return 0; } |
| 201 | +uint16_t power_get_temp(void) { return 0; } |
| 202 | + |
| 203 | +void disable_usb_host(void) {} |
| 204 | +void enable_usb_host(void) {} |
| 205 | + |
| 206 | +// This is only a guess by the ADC voltage when the USB is plugged in |
| 207 | +bool usb_connected(void) { return power_get_vbat() > 1350; } |
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