From fed8829bba4a72c215bee9829b2b4dce86bf65fe Mon Sep 17 00:00:00 2001
From: Mitchell M <mitchoah@gmail.com>
Date: Mon, 13 Jan 2025 22:43:51 -0600
Subject: [PATCH] configure for 8MHz

---
 src/neopixel_driver.h | 37 +++++++++++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 8 deletions(-)

diff --git a/src/neopixel_driver.h b/src/neopixel_driver.h
index 8e8f3b4..7ae44a8 100755
--- a/src/neopixel_driver.h
+++ b/src/neopixel_driver.h
@@ -3,6 +3,9 @@
 
 #include <ch32v00x.h>
 
+// #define CLK_24MHZ
+#define CLK_8MHZ
+
 void SPINeoPixelDriverInit(void) {
     GPIO_InitTypeDef GPIO_InitStructure={0};
     SPI_InitTypeDef SPI_InitStructure={0};
@@ -23,8 +26,14 @@ void SPINeoPixelDriverInit(void) {
     SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
     SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
     SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
-    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
     SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
+
+#ifdef CLK_24MHZ
+    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
+#endif
+#ifdef CLK_8MHZ
+    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
+#endif
     SPI_Init(SPI1, &SPI_InitStructure);
 
     SPI_Cmd(SPI1, ENABLE);
@@ -39,20 +48,25 @@ void SPISendByte(uint8_t byte) {
 }
 
 void SendNeoPixel0() {
+#ifdef CLK_24MHZ
     // 420ns High at 24MHz
     SPISendByte(0b11000000);
+#endif
+#ifdef CLK_8MHZ
+    // ????????
+    SPISendByte(0b10000000);
+#endif
 }
 
 void SendNeoPixel1() {
+#ifdef CLK_24MHZ
     // 750ns High at 24MHz
     SPISendByte(0b11110000);
-}
-
-void SendNeoPixelColor(uint8_t red, uint8_t green, uint8_t blue) {
-    // Send in GRB order, MSB first
-    SendNeoPixelByte(green);
-    SendNeoPixelByte(red);
-    SendNeoPixelByte(blue);
+#endif
+#ifdef CLK_8MHZ
+    // ????????
+    SPISendByte(0b1110000);
+#endif
 }
 
 void SendNeoPixelByte(uint8_t byte) {
@@ -65,4 +79,11 @@ void SendNeoPixelByte(uint8_t byte) {
     }
 }
 
+void SendNeoPixelColor(uint8_t red, uint8_t green, uint8_t blue) {
+    // Send in GRB order, MSB first
+    SendNeoPixelByte(green);
+    SendNeoPixelByte(red);
+    SendNeoPixelByte(blue);
+}
+
 #endif // NEOPIXEL_DRIVER_H
\ No newline at end of file