STM32F0通过SPI方式驱动WS2811彩灯源代码 -

#include "stm32f0xx.h"
#include "LED_SPI.h"
uint16_t PixelBuffer[404] = {0};
uint16_t PixelPointer = 0;
void LED_SPI_LowLevel_Init(void)
{
uint16_t i = 0;
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_DMA1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
DMA_DeInit(DMA1_Channel3);
DMA_InitStructure.DMA_BufferSize = 0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & (SPI1->DR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)PixelBuffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_Init(DMA1_Channel3, &DMA_InitStructure); /* DMA1 CH3 = MEM -> DR */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/*
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_Init(GPIOA, &GPIO_InitStructure);
*/
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_0);
/* GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_0); */
SPI_I2S_DeInit(SPI1);
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_15b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; /* 48MHz / 8 = 6MHz */
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);
SPI_Cmd(SPI1, ENABLE);
for (i = 0; i < 404; i++)
{
PixelBuffer[i] = 0xAAAA;
}
PixelPointer = 0;
}
void LED_SPI_WriteByte(uint16_t Data)
{
/* Wait until the transmit buffer is empty */
/*
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
{
}
*/
PixelBuffer[PixelPointer] = Data;
PixelPointer++;
/* Send the byte */
/* SPI_I2S_SendData16(SPI1, Data); */
}
void LED_SPI_SendBits(uint8_t bits)
{
int zero = 0x7000; //111000000000000
int one = 0x7F00; //111111100000000
int i = 0x00;
for (i = 0x80; i >= 0x01; i >>= 1)
{
LED_SPI_WriteByte((bits & i) ? one : zero);
}
}
void LED_SPI_SendPixel(struct Pixel pixel)
{
/*
r7,r6,r5,r4,r3,r2,r1,r0,g7,g6,g5,g4,g3,g2,g1,g0,b7,b6,b5,b4,b3,b2,b1,b0
\_____________________________________________________________________/
| _________________...
| / __________________...
| / / ___________________...
| / / /
RGB,RGB,RGB,RGB,...,STOP
*/
/*
BUG Fix : Actual is GRB,datasheet is something wrong.
*/
LED_SPI_SendBits(pixel.green);
LED_SPI_SendBits(pixel.red);
LED_SPI_SendBits(pixel.blue);
}
ErrorStatus LED_SPI_Update(struct Pixel buffer[], uint32_t length)
{
uint8_t i = 0;
uint8_t m = 0;
if(DMA_GetCurrDataCounter(DMA1_Channel3) == 0)
{
for (i = 0; i < length; i++)
{
LED_SPI_SendPixel(buffer[i]);
}
if(length < 16)
{
for(i = 16 - length; i < length; i++)
{
for(m = 0; m < 3; m++)
{
LED_SPI_SendBits(0x00);
}
}
}
for (i = 0; i < 20; i++)
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