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feat: simplify double-buffered driver by using direct array indexing in data space to avoid compiler register allocation bugs

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zouhaitao
2026-07-08 16:36:09 +08:00
parent 619f019615
commit 2b574bd764
1 changed files with 13 additions and 18 deletions
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31
App/main.c
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@@ -145,7 +145,6 @@ void WS2812_EncodeByte(u8 v, u8 *buf)
void WS2812_Write24Bit(u8 g, u8 r, u8 b)
{
u8 data buf[10];
u8 b0, b1, b2, b3, b4, b5, b6, b7, b8, b9;
u16 timeout;
buf[0] = 0x00; // Prepend dummy 0x00 to absorb SPI hardware startup delay/glitch
@@ -153,10 +152,6 @@ void WS2812_Write24Bit(u8 g, u8 r, u8 b)
WS2812_EncodeByte(r, &buf[4]);
WS2812_EncodeByte(b, &buf[7]);
b0 = buf[0]; b1 = buf[1]; b2 = buf[2]; b3 = buf[3];
b4 = buf[4]; b5 = buf[5]; b6 = buf[6]; b7 = buf[7];
b8 = buf[8]; b9 = buf[9];
EA = 0;
// Ensure P2.3 (MOSI) and P2.5 (SCLK) are configured as push-pull output
@@ -166,27 +161,27 @@ void WS2812_Write24Bit(u8 g, u8 r, u8 b)
SPSTAT = 0xC0; // Clear flags
SPCTL = 0xD0; // Enable SPI at SYSCLK/4 (3.0 MHz actual clock on board)
SPDAT = b0; // Start transmitting dummy 0x00 (absorbs startup delay at MOSI=0)
// Wait 30 NOPs to ensure b0 has moved to the shifter
SPDAT = buf[0]; // Start transmitting dummy 0x00 (absorbs startup delay at MOSI=0)
// Wait 30 NOPs to ensure buf[0] has moved to the shifter
_nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();
_nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();
_nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();
_nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();
SPDAT = b1; // Buffer b1 (zero gap!)
SPDAT = buf[1]; // Buffer buf[1] (zero gap!)
// Transmission loop unrolled with double-buffering and timeout protection
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = b2;
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = b3;
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = b4;
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = b5;
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = b6;
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = b7;
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = b8;
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = b9;
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = buf[2];
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = buf[3];
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = buf[4];
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = buf[5];
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = buf[6];
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = buf[7];
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = buf[8];
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; SPDAT = buf[9];
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; // Wait for b8 to finish shifting, b9 moves to shifter
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; // Wait for b9 to finish shifting
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; // Wait for buf[8] to finish shifting, buf[9] moves to shifter
timeout = 2000; while (!(SPSTAT & 0x80) && --timeout); SPSTAT = 0xC0; // Wait for buf[9] to finish shifting
SPCTL = 0x90; // Disable SPI
WS2812_DI = 0;