stm32f407通过SPI+DMA方式驱动WS2812

/********************************* (C) COPYRIGHT 2019 曼珠沙华 **************************************************** * File Name : ws2812.c * Author : @曼珠沙华 * Date : 2019/12/27 * Description : ws2812 file,led相关 * * Includes ------------------------------------------------------------------*/ #include "WS2812.h" #include "delay.h" #if SYSTEM_SUPPORT_OS #include "FreeRTOS.h" //FreeRTOS使用 #include "task.h" #endif // Some Static Colors const RGBColor_TypeDef RED = {255,0,0}; const RGBColor_TypeDef GREEN = {0,255,0}; const RGBColor_TypeDef BLUE = {0,0,255}; const RGBColor_TypeDef SKY = {0,255,255}; const RGBColor_TypeDef MAGENTA = {255,0,255}; const RGBColor_TypeDef YELLOW = {255,255,0}; const RGBColor_TypeDef ORANGE = {127,106,0}; const RGBColor_TypeDef BLACK = {0,0,0}; const RGBColor_TypeDef WHITE = {255,255,255}; const RGBColor_TypeDef PURPLE = {65,105,225}; u8 pixelBuffer[ Pixel_S1_NUM][24]; //灯珠 /*********************************************************************************************** ** name: WS2812b_Configuration ** function: WS2812B SPI DMA总线初始化 **parameter: void ** return: void ** date: 2019/12/27 ** create: @曼珠沙华 ************************************************************************************************/ void WS2812b_Configuration(void){ GPIO_InitTypeDef GPIO_InitStructure; SPI_InitTypeDef SPI_InitStructure; DMA_InitTypeDef DMA_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); //使能GPIOB时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); //使能SPI2时钟 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE); //DMA1时钟使能 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; //PB15复用功能输出 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //100MHz GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉 GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化 GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_SPI2); //PB15复用为 SPI2 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //设置SPI单向或者双向的数据模式:SPI设置为双线双向全双工 SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI工作模式:设置为主SPI SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //设置SPI的数据大小:SPI发送接收8位帧结构 SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //串行同步时钟的空闲状态为高电平 SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //串行同步时钟的第二个跳变沿（上升或下降）数据被采样 SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制 SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; //42M/8=5.25M SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始 SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值计算的多项式 SPI_Init(SPI2, &SPI_InitStructure); //根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器 SPI_Cmd(SPI2, ENABLE); //使能SPI外设 DMA_DeInit(DMA1_Stream4); while (DMA_GetCmdStatus(DMA1_Stream4) != DISABLE){} //等待DMA可配置 DMA_InitStructure.DMA_Channel = DMA_Channel_0; //通道选择 DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&SPI2->DR; //DMA外设地址 DMA_InitStructure.DMA_Memory0BaseAddr = (u32)pixelBuffer; //DMA 存储器0地址 DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; //存储器到外设模式 DMA_InitStructure.DMA_BufferSize = Pixel_S1_NUM * 24; //数据传输量 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据长度:8位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度:8位 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; // 使用普通模式 DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //中等优先级 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //存储器突发单次传输 DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发单次传输 DMA_Init(DMA1_Stream4, &DMA_InitStructure); //初始化DMA Stream SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE); // 使能SPI2的DMA发送 DMA_Cmd(DMA1_Stream4, DISABLE); //关闭DMA传输 while (DMA_GetCmdStatus(DMA1_Stream4) != DISABLE){} //确保DMA可以被设置 DMA_SetCurrDataCounter(DMA1_Stream4,Pixel_S1_NUM * 24); //数据传输量 DMA_Cmd(DMA1_Stream4, ENABLE); delay_xms(1); RGB_BLACK(Pixel_S1_NUM); //RGB RESET delay_xms(1); } /*********************************************************************************************** ** name: rgb_SetColor ** function: 设定某个RGB LED的颜色 **parameter: void ** return: void ** date: 2019/12/27 ** create: @曼珠沙华 ************************************************************************************************/ void rgb_SetColor(u8 LedId, RGBColor_TypeDef Color){ u8 i; if( LedId > ( Pixel_S1_NUM ) ){ return; //to avoid overflow } for(i=0;i<=7;i++){ pixelBuffer[LedId][i]= ( (Color.G & (1 << (7 -i)) )? (CODE1):CODE0 ); } for(i=8;i<=15;i++){ pixelBuffer[LedId][i]= ( (Color.R & (1 << (15-i)) )? (CODE1):CODE0 ); } for(i=16;i<=23;i++){ pixelBuffer[LedId][i]= ( (Color.B & (1 << (23-i)) )? (CODE1):CODE0 ); } } /*********************************************************************************************** ** name: rgb_SendArray ** function: Configure colors to RGB pixel series. RGBColor_TypeDef: pointer to a RGBColor_TypeDef structure that contains the color configuration information for the RGB pixel. **parameter: void ** return: void ** date: 2019/12/27 ** create: @曼珠沙华 ************************************************************************************************/ void rgb_SendArray(void){ if(DMA_GetFlagStatus(DMA1_Stream4,DMA_FLAG_TCIF4) != RESET){ //等待DMA1_Steam5传输完成 DMA_ClearFlag(DMA1_Stream4,DMA_FLAG_TCIF4); //清除DMA1_Steam5传输完成标志，先预想DMA_FLAG_TCIF0的零，代表的是Channel SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE); // 使能SPI3的DMA发送 DMA_Cmd(DMA1_Stream4, DISABLE); //关闭DMA传输 while (DMA_GetCmdStatus(DMA1_Stream4) != DISABLE){} //确保DMA可以被设置 DMA_SetCurrDataCounter(DMA1_Stream4,Pixel_S1_NUM * 24); //数据传输量 DMA_Cmd(DMA1_Stream4, ENABLE); //开启DMA传输 } } //下面的几个颜色控制函数完全可以写到一起，本人太懒，就没弄 /*********************************************************************************************** ** name: RGB_RED ** function: 设定颜色为RED **parameter: Pixel_LEN 灯珠数 ** return: void ** date: 2019/12/27 ** create: @曼珠沙华 *****************************************************