add basic signal led

firmware/lux.cpp

@@ -1,3 +1,32 @@
 //
 // 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);
+}
+
+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);
+
+    vTaskDelete(nullptr);
+}