【悟空派H3开发板免费体验】基于spi驱动WS2812灯

使用spi引脚驱动WS2812,接线端口如下

程序如下spi_ws2812.c：

#include "sys/types.h"#include "sys/stat.h"#include "sys/ioctl.h"#include "fcntl.h"#include "stdio.h"#include "string.h"#include "unistd.h"#include "linux/spi/spidev.h"/******************************************************************************* *Definitions ******************************************************************************/#define WS2812_PIXELS 3 #define WS_TRANSFER_SIZE (WS2812_PIXELS*24) // Transfer dataSize #define WS_BIT 24 #define WS_BIT1 0x7C #define WS_BIT0 0x60 /******************************************************************************* *Variables ******************************************************************************/ u_int8_t g_WS2812TxBuf[WS_TRANSFER_SIZE]; // WS2812 Strip transmit data buffer void WS2812_PixelSetIndexRGB(u_int16_t n, u_int8_t r, u_int8_t g, u_int8_t b) { if(n < WS2812_PIXELS) { memset((void *)&g_WS2812TxBuf[n*WS_BIT], WS_BIT0, 24); if( ((g>>7)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 0+0] = WS_BIT1; if( ((g>>6)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 0+1] = WS_BIT1;if( ((g>>5)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 0+2] = WS_BIT1; if( ((g>>4)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 0+3] = WS_BIT1; if( ((g>>3)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 0+4] = WS_BIT1; if( ((g>>2)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 0+5] = WS_BIT1; if( ((g>>1)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 0+6] = WS_BIT1; if( ((g>>0)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 0+7] = WS_BIT1; if( ((r>>7)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 8+0] = WS_BIT1; if( ((r>>6)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 8+1] = WS_BIT1; if( ((r>>5)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 8+2] = WS_BIT1; if( ((r>>4)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 8+3] = WS_BIT1; if( ((r>>3)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 8+4] = WS_BIT1; if( ((r>>2)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 8+5] = WS_BIT1; if( ((r>>1)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 8+6] = WS_BIT1; if( ((r>>0)&0x01)) g_WS2812TxBuf[n*WS_BIT+ 8+7] = WS_BIT1; if( ((b>>7)&0x01)) g_WS2812TxBuf[n*WS_BIT+16+0] = WS_BIT1; if( ((b>>6)&0x01)) g_WS2812TxBuf[n*WS_BIT+16+1] = WS_BIT1; if( ((b>>5)&0x01)) g_WS2812TxBuf[n*WS_BIT+16+2] = WS_BIT1; if( ((b>>4)&0x01)) g_WS2812TxBuf[n*WS_BIT+16+3] = WS_BIT1; if( ((b>>3)&0x01)) g_WS2812TxBuf[n*WS_BIT+16+4] = WS_BIT1; if( ((b>>2)&0x01)) g_WS2812TxBuf[n*WS_BIT+16+5] = WS_BIT1; if( ((b>>1)&0x01)) g_WS2812TxBuf[n*WS_BIT+16+6] = WS_BIT1; if( ((b>>0)&0x01)) g_WS2812TxBuf[n*WS_BIT+16+7] = WS_BIT1; } }int fd = -1; void WS2812_ShowRGB(u_int8_t r,u_int8_t g,u_int8_t b) { int i; for(i=0; i

将c文件传入悟空派内。
然后通过GCC编译。
gcc spi_ws2812.c -o spiws2812
编译成功后执行：
./spiws2812