【STM32】硬件SPI+DMA驱动WS2812灯珠，基于HAL库

以下是一个使用STM32硬件SPI和DMA来驱动WS2812灯珠的示例代码，基于STM32 HAL库。

#include "stm32fxxx_hal.h"
 
// 定义SPI时钟速度
#define SPI_BAUDRATEPRESCALER   SPI_BAUDRATEPRESCALER_256
 
SPI_HandleTypeDef hspi1;
DMA_HandleTypeDef hdma_spi1_tx;
 
// 初始化SPI1和DMA
void SPI1_Init(void) {
    hspi1.Instance = SPI1;
    hspi1.Init.Mode = SPI_MODE_MASTER;
    hspi1.Init.Direction = SPI_DIRECTION_2LINES;
    hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
    hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
    hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
    hspi1.Init.NSS = SPI_NSS_SOFT;
    hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER;
    hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
    hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
    hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
    hspi1.Init.CRCPolynomial = 7;
    if (HAL_SPI_Init(&hspi1) != HAL_OK) {
        Error_Handler();
    }
}
 
void DMA_Config(void) {
    __HAL_RCC_DMA2_CLK_ENABLE();
    hdma_spi1_tx.Instance = DMA2_Stream3;
    hdma_spi1_tx.Init.Channel = DMA_CHANNEL_3;
    hdma_spi1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
    hdma_spi1_tx.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_spi1_tx.Init.MemInc = DMA_MINC_ENABLE;
    hdma_spi1_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    hdma_spi1_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
    hdma_spi1_tx.Init.Mode = DMA_NORMAL;
    hdma_spi1_tx.Init.Priority = DMA_PRIORITY_HIGH;
    hdma_spi1_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    if (HAL_DMA_Init(&hdma_spi1_tx) != HAL_OK) {
        Error_Handler();
    }
 
    __HAL_LINKDMA(&hspi1,hdmatx,hdma_spi1_tx);
 
    HAL_NVIC_SetPriority(DMA2_Stream3_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(DMA2_Stream3_IRQn);
}
 
void HAL_SPI_MspInit(SPI_HandleTypeDef* spiHandle) {
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    if(spiHandle->Instance==SPI1) {
        __HAL_RCC_SPI1_CLK_ENABLE();
 
        __HAL_RCC_GPIOA_CLK_ENABLE();
        GPIO_InitStruct.Pin = GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7