fiatlux/firmware/lux.cpp

//
// Created by jedi on 25.06.21.
//

#include "lux.h"

#include <string.h>
#include <FreeRTOS.h>
#include <task.h>

#include <esp/spi.h>

const int signal_led_pin = 2;

const int cs0 = 15;
const int gpio4 = 4;
const int gpio5 = 5;

extern "C" void signal_led(bool state) {
    gpio_write(signal_led_pin, !state);
}

void int_to_hex(uint8_t i, char buf[2]) {
    uint8_t hex_charset[] = "0123456789ABCDEF";
    buf[0] = hex_charset[i >> 4];
    buf[1] = hex_charset[i & 0x0F];
}

extern "C" void lux_task(void *pvParameters) {

    gpio_enable(signal_led_pin, GPIO_OUTPUT);
    gpio_enable(cs0, GPIO_OUTPUT);
    gpio_enable(gpio4, GPIO_OUTPUT);
    gpio_enable(gpio5, GPIO_OUTPUT);
    spi_init(1, SPI_MODE0, SPI_FREQ_DIV_1M, 1, SPI_BIG_ENDIAN, 1);

    uint8_t charset[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

    uint8_t cnt = 0;

    while(1) {
        uint8_t buf[2];
        spi_transfer_8(1, charset[cnt++]);
        for(volatile int i = 0; i < 100; i++);
        spi_read(1, 0x00, buf, 2, 1);

        char hex[5];
        int_to_hex(buf[0], hex);
        int_to_hex(buf[1], hex + 2);
        hex[4] = '\0';
        printf("lux_task output: %s\n", hex);

        vTaskDelay(1000/portTICK_PERIOD_MS);
        cnt %= sizeof(charset);
    }


    vTaskDelete(nullptr);
}