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solution.c

+#include "pico/stdlib.h"
+#include "hardware/pio.h"
+#include "ws2812.pio.h"
+
+#define IS_RGBW true
+#define WS2812_PIN 28
+
+#define BUTTON_1_PIN 20
+#define BUTTON_2_PIN 21
+#define BUTTON_3_PIN 22
+
+static inline void put_pixel(uint32_t pixel_grb) {
+    pio_sm_put_blocking(pio0, 0, pixel_grb << 8u);
+}
+
+static inline uint32_t urgb_u32(uint8_t r, uint8_t g, uint8_t b) {
+    return
+            ((uint32_t) (r) << 8) |
+            ((uint32_t) (g) << 16) |
+            (uint32_t) (b);
+}
+
+int main() {
+    stdio_init_all();
+
+    // Setting up the ws2812
+    PIO pio = pio0;
+    int sm = 0;
+    uint offset = pio_add_program(pio, &ws2812_program);
+
+    ws2812_program_init(pio, sm, offset, WS2812_PIN, 800000, IS_RGBW);
+
+    // Initializing buttons
+    gpio_init(BUTTON_1_PIN);
+    gpio_set_dir(BUTTON_1_PIN, GPIO_IN);
+    gpio_pull_up(BUTTON_1_PIN);
+
+    gpio_init(BUTTON_2_PIN);
+    gpio_set_dir(BUTTON_2_PIN, GPIO_IN);
+    gpio_pull_up(BUTTON_2_PIN);
+
+    gpio_init(BUTTON_3_PIN);
+    gpio_set_dir(BUTTON_3_PIN, GPIO_IN);
+    gpio_pull_up(BUTTON_3_PIN);
+
+    // Main loop
+    while (true) {
+        if (!gpio_get(BUTTON_1_PIN)) {
+            put_pixel(urgb_u32(0xff, 0, 0));
+        }
+        if (!gpio_get(BUTTON_2_PIN)) {
+            put_pixel(urgb_u32(0, 0xff, 0));
+        }
+        if (!gpio_get(BUTTON_3_PIN)) {
+            put_pixel(urgb_u32(0, 0, 0xff));
+        }
+    }
+
+    return 0; // This will never be reached
+}
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