325 lines
7.9 KiB
C
325 lines
7.9 KiB
C
/**
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* @file ADCRAW.c
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*/
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#include "adcraw.h"
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#include "esp_system.h"
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#include "esp_log.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "driver/gpio.h"
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#include <stddef.h>
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#if CONFIG_LV_TOUCH_CONTROLLER_ADCRAW
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#define TAG "ADCRAW"
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#define CALIBRATIONINSET 1 // range 0 <= CALIBRATIONINSET <= 40
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#define SAMPLE_CALIBRATION_POINTS 4
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// use this scale factor to avoid working in floating point numbers
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#define TOUCHSCREEN_RESISTIVE_CALIBRATION_SCALE_FACTOR 8
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#define SCALE_FACTOR (1 << TOUCHSCREEN_RESISTIVE_CALIBRATION_SCALE_FACTOR)
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#define CAL_X_INSET (((GetMaxX() + 1) * (CALIBRATIONINSET >> 1)) / 100)
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#define CAL_Y_INSET (((GetMaxY() + 1) * (CALIBRATIONINSET >> 1)) / 100)
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#define NUMSAMPLES 8
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static void ad_touch_handler(void *arg);
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static const esp_timer_create_args_t periodic_timer_args = {
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.callback = &ad_touch_handler,
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};
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static esp_timer_handle_t periodic_timer;
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// Current ADC values for X and Y channels
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int16_t adcX, adcY = 0;
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int16_t temp_x, temp_y, temp_z1, temp_z2;
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// coefficient values
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int _trA, _trB, _trC, _trD;
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int16_t xRawTouch[SAMPLE_CALIBRATION_POINTS];
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int16_t yRawTouch[SAMPLE_CALIBRATION_POINTS];
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TOUCH_STATES state;
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const gpio_num_t yu = TOUCHSCREEN_RESISTIVE_PIN_YU;
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const gpio_num_t xl = TOUCHSCREEN_RESISTIVE_PIN_XL;
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const gpio_num_t yd = TOUCHSCREEN_RESISTIVE_PIN_YD;
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const gpio_num_t xr = TOUCHSCREEN_RESISTIVE_PIN_XR;
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static const int gpio_to_adc[] = {
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GPIO_TO_ADC_ELEMENT(TOUCHSCREEN_RESISTIVE_PIN_YD),
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GPIO_TO_ADC_ELEMENT(TOUCHSCREEN_RESISTIVE_PIN_XR)
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};
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static void TouchCalculateCalPoints(void)
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{
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int32_t trA, trB, trC, trD; // variables for the coefficients
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int32_t trAhold, trBhold, trChold, trDhold;
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int32_t test1, test2; // temp variables (must be signed type)
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int16_t xPoint[SAMPLE_CALIBRATION_POINTS], yPoint[SAMPLE_CALIBRATION_POINTS];
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yPoint[0] = yPoint[1] = CAL_Y_INSET;
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yPoint[2] = yPoint[3] = (GetMaxY() - CAL_Y_INSET);
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xPoint[0] = xPoint[3] = CAL_X_INSET;
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xPoint[1] = xPoint[2] = (GetMaxX() - CAL_X_INSET);
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// calculate points transfer function
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// based on two simultaneous equations solve for the constants
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// use sample points 1 and 4
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// Dy1 = aTy1 + b; Dy4 = aTy4 + b
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// Dx1 = cTx1 + d; Dy4 = aTy4 + b
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test1 = (int32_t)yPoint[0] - (int32_t)yPoint[3];
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test2 = (int32_t)yRawTouch[0] - (int32_t)yRawTouch[3];
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trA = ((int32_t)((int32_t)test1 * SCALE_FACTOR) / test2);
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trB = ((int32_t)((int32_t)yPoint[0] * SCALE_FACTOR) - (trA * (int32_t)yRawTouch[0]));
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test1 = (int32_t)xPoint[0] - (int32_t)xPoint[2];
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test2 = (int32_t)xRawTouch[0] - (int32_t)xRawTouch[2];
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trC = ((int32_t)((int32_t)test1 * SCALE_FACTOR) / test2);
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trD = ((int32_t)((int32_t)xPoint[0] * SCALE_FACTOR) - (trC * (int32_t)xRawTouch[0]));
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trAhold = trA;
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trBhold = trB;
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trChold = trC;
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trDhold = trD;
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// use sample points 2 and 3
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// Dy2 = aTy2 + b; Dy3 = aTy3 + b
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// Dx2 = cTx2 + d; Dy3 = aTy3 + b
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test1 = (int32_t)yPoint[1] - (int32_t)yPoint[2];
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test2 = (int32_t)yRawTouch[1] - (int32_t)yRawTouch[2];
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trA = ((int32_t)(test1 * SCALE_FACTOR) / test2);
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trB = ((int32_t)((int32_t)yPoint[1] * SCALE_FACTOR) - (trA * (int32_t)yRawTouch[1]));
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test1 = (int32_t)xPoint[1] - (int32_t)xPoint[3];
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test2 = (int32_t)xRawTouch[1] - (int32_t)xRawTouch[3];
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trC = ((int32_t)((int32_t)test1 * SCALE_FACTOR) / test2);
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trD = ((int32_t)((int32_t)xPoint[1] * SCALE_FACTOR) - (trC * (int32_t)xRawTouch[1]));
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// get the average and use it
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_trA = (trA + trAhold) >> 1;
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_trB = (trB + trBhold) >> 1;
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_trC = (trC + trChold) >> 1;
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_trD = (trD + trDhold) >> 1;
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}
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void adcraw_init(void)
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{
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state = IDLE; // set the state of the state machine to start the sampling
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gpio_set_drive_capability(yu, GPIO_DRIVE_CAP_3);
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gpio_set_drive_capability(yd, GPIO_DRIVE_CAP_3);
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gpio_set_drive_capability(xl, GPIO_DRIVE_CAP_3);
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gpio_set_drive_capability(xr, GPIO_DRIVE_CAP_3);
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ESP_ERROR_CHECK(esp_timer_create(&periodic_timer_args, &periodic_timer));
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ESP_ERROR_CHECK(esp_timer_start_periodic(periodic_timer, 5 * 1000)); //5ms (expressed as microseconds)
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/*Load calibration data*/
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xRawTouch[0] = TOUCHCAL_ULX;
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yRawTouch[0] = TOUCHCAL_ULY;
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xRawTouch[1] = TOUCHCAL_URX;
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yRawTouch[1] = TOUCHCAL_URY;
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xRawTouch[3] = TOUCHCAL_LLX;
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yRawTouch[3] = TOUCHCAL_LLY;
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xRawTouch[2] = TOUCHCAL_LRX;
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yRawTouch[2] = TOUCHCAL_LRY;
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TouchCalculateCalPoints();
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}
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static void setup_axis(gpio_num_t plus, gpio_num_t minus, gpio_num_t measure, gpio_num_t ignore)
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{
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// Set GPIOs:
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// - Float "ignore" and "measure"
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gpio_pad_select_gpio(ignore);
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gpio_set_direction(ignore, GPIO_MODE_DISABLE);
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gpio_set_pull_mode(ignore, GPIO_FLOATING);
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gpio_pad_select_gpio(measure);
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gpio_set_direction(measure, GPIO_MODE_DISABLE);
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gpio_set_pull_mode(measure, GPIO_FLOATING);
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// - Set "plus" to 1, "minus" to 0
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gpio_config(&(gpio_config_t) {
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.mode = GPIO_MODE_OUTPUT,
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.pin_bit_mask = (1ULL << plus) | (1ULL << minus)
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});
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gpio_set_level(plus, 1);
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gpio_set_level(minus, 0);
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}
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static void setup_adc(gpio_num_t measure)
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{
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// Init ADC
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adc1_channel_t channel = gpio_to_adc[measure];
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adc_gpio_init(ADC_UNIT_1, channel);
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adc1_config_width(ADC_WIDTH_BIT_10);
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adc1_config_channel_atten(channel, ADC_ATTEN_DB_11);
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}
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static void insert_sort(int16_t array[], uint8_t size) {
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uint8_t j;
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int16_t save;
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for (int i = 1; i < size; i++) {
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save = array[i];
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for (j = i; j >= 1 && save < array[j - 1]; j--)
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array[j] = array[j - 1];
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array[j] = save;
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}
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}
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static void ad_touch_handler(void *arg)
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{
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(void) arg;
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uint8_t i;
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int16_t samples[NUMSAMPLES];
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switch (state) {
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case IDLE:
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adcX = 0;
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adcY = 0;
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case SET_X :
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setup_axis(yd, yu, xr, xl);
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setup_adc(xr);
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state = READ_X;
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break;
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case READ_X:
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for (i = 0; i < NUMSAMPLES; i++)
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samples[i] = adc1_get_raw(gpio_to_adc[xr]);
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insert_sort(samples, NUMSAMPLES);
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temp_x = samples[NUMSAMPLES / 2];
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case SET_Y :
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setup_axis(xl, xr, yd, yu);
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setup_adc(yd);
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state = READ_Y;
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break;
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case READ_Y:
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for (i = 0; i < NUMSAMPLES; i++)
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samples[i] = adc1_get_raw(gpio_to_adc[yd]);
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insert_sort(samples, NUMSAMPLES);
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temp_y = samples[NUMSAMPLES / 2];
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case SET_Z1 :
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setup_axis(yu, xl, yd, xr);
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setup_adc(yd);
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state = READ_Z1;
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break;
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case READ_Z1:
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temp_z1 = adc1_get_raw(gpio_to_adc[yd]);
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case SET_Z2 :
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setup_axis(yu, xl, xr, yd);
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setup_adc(yd);
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state = READ_Z2;
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break;
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case READ_Z2:
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temp_z2 = adc1_get_raw(gpio_to_adc[xr]);
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if (temp_z1 < TOUCHSCREEN_RESISTIVE_PRESS_THRESHOLD) {
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#if CONFIG_LV_TOUCH_XY_SWAP
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adcX = temp_y;
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adcY = temp_x;
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#else
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adcX = temp_x;
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adcY = temp_y;
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#endif
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}
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else {
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adcX = -1;
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adcY = -1;
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}
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state = SET_X;
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//printf("x: %d y: %d z: %d\n", adcX, adcY, temp_z1 - temp_z2);
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break;
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}
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return;
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}
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static int16_t TouchGetRawX(void)
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{
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int16_t x = adcX;
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#if CONFIG_LV_TOUCH_INVERT_X
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x = 1023 - x;
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#endif
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return x;
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}
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static int16_t TouchGetX(void)
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{
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int16_t result = TouchGetRawX();
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if (result > 0) {
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result = (int16_t)((((int32_t)_trC * result) + _trD) >> TOUCHSCREEN_RESISTIVE_CALIBRATION_SCALE_FACTOR);
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}
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printf("x: %d\n", result);
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return (result);
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}
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static int16_t TouchGetRawY(void)
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{
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int16_t y = adcY;
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#if CONFIG_LV_TOUCH_INVERT_Y
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y = 1023 - y;
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#endif
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return y;
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}
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static int16_t TouchGetY(void)
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{
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int16_t result = TouchGetRawY();
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if (result > 0) {
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result = (int16_t)((((int32_t)_trA * result) + (int32_t)_trB) >> TOUCHSCREEN_RESISTIVE_CALIBRATION_SCALE_FACTOR);
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}
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printf("y: %d\n", result);
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return (result);
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}
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/**
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* Get the current position and state of the touchpad
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* @param data store the read data here
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* @return false: because no more data to be read
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*/
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bool adcraw_read(lv_indev_drv_t * drv, lv_indev_data_t * data)
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{
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static int16_t last_x = 0;
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static int16_t last_y = 0;
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int16_t x, y;
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x = TouchGetX();
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y = TouchGetY();
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if ((x > 0) && (y > 0)) {
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data->point.x = x;
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data->point.y = y;
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last_x = data->point.x;
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last_y = data->point.y;
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data->state = LV_INDEV_STATE_PR;
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}
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else {
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data->point.x = last_x;
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data->point.y = last_y;
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data->state = LV_INDEV_STATE_REL;
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}
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return false;
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}
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#endif //CONFIG_LV_TOUCH_CONTROLLER_ADCRAW
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