Initial Release

2021-01-20 10:49:34 -06:00
commit 46078742c7
245 changed files with 21157 additions and 0 deletions
--- a/pio/apa102/apa102.c
+++ b/pio/apa102/apa102.c
@@ -0,0 +1,69 @@
+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include <math.h>
+
+#include "pico/stdlib.h"
+#include "hardware/pio.h"
+#include "apa102.pio.h"
+
+#define PIN_CLK 2
+#define PIN_DIN 3
+
+#define N_LEDS 150
+#define SERIAL_FREQ (5 * 1000 * 1000)
+
+// Global brightness value 0->31
+#define BRIGHTNESS 16
+
+void put_start_frame(PIO pio, uint sm) {
+    pio_sm_put_blocking(pio, sm, 0u);
+}
+
+void put_end_frame(PIO pio, uint sm) {
+    pio_sm_put_blocking(pio, sm, ~0u);
+}
+
+void put_rgb888(PIO pio, uint sm, uint8_t r, uint8_t g, uint8_t b) {
+    pio_sm_put_blocking(pio, sm,
+                        0x7 << 29 |                   // magic
+                        (BRIGHTNESS & 0x1f) << 24 |   // global brightness parameter
+                        (uint32_t) b << 16 |
+                        (uint32_t) g << 8 |
+                        (uint32_t) r << 0
+    );
+}
+
+#define TABLE_SIZE (1 << 8)
+uint8_t wave_table[TABLE_SIZE];
+
+int main() {
+    stdio_init_all();
+
+    PIO pio = pio0;
+    uint sm = 0;
+    uint offset = pio_add_program(pio, &apa102_mini_program);
+    apa102_mini_program_init(pio, sm, offset, SERIAL_FREQ, PIN_CLK, PIN_DIN);
+
+    for (int i = 0; i < TABLE_SIZE; ++i)
+        wave_table[i] = powf(sinf(i * M_PI / TABLE_SIZE), 5.f) * 255;
+
+    uint t = 0;
+    while (true) {
+        put_start_frame(pio, sm);
+        for (int i = 0; i < N_LEDS; ++i) {
+            put_rgb888(pio, sm,
+                       wave_table[(i + t) % TABLE_SIZE],
+                       wave_table[(2 * i + 3 * 2) % TABLE_SIZE],
+                       wave_table[(3 * i + 4 * t) % TABLE_SIZE]
+            );
+        }
+        put_end_frame(pio, sm);
+        sleep_ms(10);
+        ++t;
+    }
+}