WS2812 driver improvements (#20262)

1 files changed, 109 insertions, 0 deletions

diff --git a/platforms/chibios/drivers/ws2812_bitbang.c b/platforms/chibios/drivers/ws2812_bitbang.c
new file mode 100644
index 0000000000..55ac333b1e
--- /dev/null
+++ b/platforms/chibios/drivers/ws2812_bitbang.c
@@ -0,0 +1,109 @@
+#include "quantum.h"
+#include "ws2812.h"
+#include <ch.h>
+#include <hal.h>
+
+/* Adapted from https://github.com/bigjosh/SimpleNeoPixelDemo/ */
+
+#ifndef NOP_FUDGE
+#    if defined(STM32F0XX) || defined(STM32F1XX) || defined(GD32VF103) || defined(STM32F3XX) || defined(STM32F4XX) || defined(STM32L0XX) || defined(WB32F3G71xx) || defined(WB32FQ95xx)
+#        define NOP_FUDGE 0.4
+#    else
+#        error("NOP_FUDGE configuration required")
+#        define NOP_FUDGE 1 // this just pleases the compile so the above error is easier to spot
+#    endif
+#endif
+
+// Push Pull or Open Drain Configuration
+// Default Push Pull
+#ifndef WS2812_EXTERNAL_PULLUP
+#    define WS2812_OUTPUT_MODE PAL_MODE_OUTPUT_PUSHPULL
+#else
+#    define WS2812_OUTPUT_MODE PAL_MODE_OUTPUT_OPENDRAIN
+#endif
+
+// The reset gap can be 6000 ns, but depending on the LED strip it may have to be increased
+// to values like 600000 ns. If it is too small, the pixels will show nothing most of the time.
+#ifndef WS2812_RES
+#    define WS2812_RES (1000 * WS2812_TRST_US) // Width of the low gap between bits to cause a frame to latch
+#endif
+
+#define NUMBER_NOPS 6
+#define CYCLES_PER_SEC (CPU_CLOCK / NUMBER_NOPS * NOP_FUDGE)
+#define NS_PER_SEC (1000000000L) // Note that this has to be SIGNED since we want to be able to check for negative values of derivatives
+#define NS_PER_CYCLE (NS_PER_SEC / CYCLES_PER_SEC)
+#define NS_TO_CYCLES(n) ((n) / NS_PER_CYCLE)
+
+#define wait_ns(x)                                  \
+    do {                                            \
+        for (int i = 0; i < NS_TO_CYCLES(x); i++) { \
+            __asm__ volatile("nop\n\t"              \
+                             "nop\n\t"              \
+                             "nop\n\t"              \
+                             "nop\n\t"              \
+                             "nop\n\t"              \
+                             "nop\n\t");            \
+        }                                           \
+    } while (0)
+
+void sendByte(uint8_t byte) {
+    // WS2812 protocol wants most significant bits first
+    for (unsigned char bit = 0; bit < 8; bit++) {
+        bool is_one = byte & (1 << (7 - bit));
+        // using something like wait_ns(is_one ? T1L : T0L) here throws off timings
+        if (is_one) {
+            // 1
+            writePinHigh(RGB_DI_PIN);
+            wait_ns(WS2812_T1H);
+            writePinLow(RGB_DI_PIN);
+            wait_ns(WS2812_T1L);
+        } else {
+            // 0
+            writePinHigh(RGB_DI_PIN);
+            wait_ns(WS2812_T0H);
+            writePinLow(RGB_DI_PIN);
+            wait_ns(WS2812_T0L);
+        }
+    }
+}
+
+void ws2812_init(void) {
+    palSetLineMode(RGB_DI_PIN, WS2812_OUTPUT_MODE);
+}
+
+// Setleds for standard RGB
+void ws2812_setleds(LED_TYPE *ledarray, uint16_t leds) {
+    static bool s_init = false;
+    if (!s_init) {
+        ws2812_init();
+        s_init = true;
+    }
+
+    // this code is very time dependent, so we need to disable interrupts
+    chSysLock();
+
+    for (uint8_t i = 0; i < leds; i++) {
+        // WS2812 protocol dictates grb order
+#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
+        sendByte(ledarray[i].g);
+        sendByte(ledarray[i].r);
+        sendByte(ledarray[i].b);
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
+        sendByte(ledarray[i].r);
+        sendByte(ledarray[i].g);
+        sendByte(ledarray[i].b);
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
+        sendByte(ledarray[i].b);
+        sendByte(ledarray[i].g);
+        sendByte(ledarray[i].r);
+#endif
+
+#ifdef RGBW
+        sendByte(ledarray[i].w);
+#endif
+    }
+
+    wait_ns(WS2812_RES);
+
+    chSysUnlock();
+}