STM32F103 DMA DAC 定时器播放W25Q中的WAV音频代码

以下是一个基于STM32F103的DMA DAC和定时器播放W25Q中WAV音频的示例代码：

#include "stm32f10x.h"
#include "stm32f10x_dma.h"
#include "stm32f10x_dac.h"
#include "stm32f10x_tim.h"
#include "stm32f10x_spi.h"

#define SPI_PORT            GPIOA
#define SPI_CS_PIN          GPIO_Pin_4

#define AUDIO_BUFFER_SIZE   1024
#define DMA_CHANNEL         DMA1_Channel3
#define DAC_DHR12R1_ADDRESS DAC_DHR12R1_Address

uint16_t audio_buffer[AUDIO_BUFFER_SIZE];
uint32_t audio_data_length = 0;
uint32_t audio_data_index = 0;

void SPI_Configuration(void)
{
    SPI_InitTypeDef spi_init_struct;
    GPIO_InitTypeDef gpio_init_struct;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

    gpio_init_struct.GPIO_Pin = SPI_CS_PIN;
    gpio_init_struct.GPIO_Mode = GPIO_Mode_Out_PP;
    gpio_init_struct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(SPI_PORT, &gpio_init_struct);

    GPIO_SetBits(SPI_PORT, SPI_CS_PIN);

    gpio_init_struct.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;＊＊＊