SPI_I2S_DMACmd
时间: 2023-10-12 16:06:25 浏览: 82
SPI_I2S_DMACmd 是一个函数,用于使能或禁用 SPI 或 I2S 接口的 DMA 传输。它的函数原型如下:
```c
void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, uint16_t SPI_I2S_DMAReq, FunctionalState NewState);
```
其中,SPIx 是指向 SPI 或 I2S 外设的指针,SPI_I2S_DMAReq 是 DMA 请求的类型,可以是以下值之一:
- SPI_I2S_DMAReq_Tx: 用于指定发送数据时的 DMA 请求。
- SPI_I2S_DMAReq_Rx: 用于指定接收数据时的 DMA 请求。
NewState 是新的状态,可以是 ENABLE 或 DISABLE。
通过调用 SPI_I2S_DMACmd 函数,可以根据需要配置 SPI 或 I2S 接口的 DMA 传输使能或禁用。
相关问题
STM32 用I2S和DMA控制CS4344播放WAVE音频详细程序
以下是一个使用STM32的I2S和DMA控制CS4344播放WAVE音频的详细程序:
```c
#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_spi.h"
#include "stm32f4xx_dma.h"
#include "wave.h"
#define AUDIO_BUFFER_SIZE 2048
static uint16_t audio_buffer[AUDIO_BUFFER_SIZE];
static uint32_t audio_buffer_index = 0;
static uint32_t audio_buffer_size = 0;
void RCC_Configuration(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_12 | GPIO_Pin_15;
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_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource15, GPIO_AF_SPI3);
}
void SPI_Configuration(void)
{
SPI_InitTypeDef SPI_InitStructure;
SPI_I2S_DeInit(SPI3);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI3, &SPI_InitStructure);
SPI_Cmd(SPI3, ENABLE);
}
void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(DMA1_Stream7);
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI3->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)audio_buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_BufferSize = AUDIO_BUFFER_SIZE;
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_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream7, &DMA_InitStructure);
DMA_ITConfig(DMA1_Stream7, DMA_IT_TC, ENABLE);
NVIC_EnableIRQ(DMA1_Stream7_IRQn);
}
void DMA1_Stream7_IRQHandler(void)
{
if (DMA_GetITStatus(DMA1_Stream7, DMA_IT_TCIF7) != RESET) {
DMA_ClearITPendingBit(DMA1_Stream7, DMA_IT_TCIF7);
audio_buffer_index += AUDIO_BUFFER_SIZE;
audio_buffer_size -= AUDIO_BUFFER_SIZE;
if (audio_buffer_size < AUDIO_BUFFER_SIZE) {
DMA_Cmd(DMA1_Stream7, DISABLE);
SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx, DISABLE);
}
}
}
void CS4344_Init(void)
{
GPIO_SetBits(GPIOA, GPIO_Pin_4);
uint16_t reg = 0x0000; // DAC control register
reg |= 0x0001; // Soft reset
reg |= 0x0002; // Power up
reg |= 0x0020; // I2S mode
reg |= 0x0080; // Master mode
reg |= 0x0100; // 24-bit data
reg |= 0x0200; // BCLK is input to DAC
reg |= 0x0800; // MCLK is input to DAC
reg |= 0x1000; // Left channel DAC data is left-justified
reg |= 0x2000; // Right channel DAC data is right-justified
reg |= 0x4000; // Soft mute disable
CS4344_WriteReg(reg);
}
void CS4344_WriteReg(uint16_t reg)
{
GPIO_ResetBits(GPIOA, GPIO_Pin_4);
SPI_I2S_SendData(SPI3, (reg >> 8) & 0xFF);
while (SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_BSY) == SET);
SPI_I2S_SendData(SPI3, reg & 0xFF);
while (SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_BSY) == SET);
GPIO_SetBits(GPIOA, GPIO_Pin_4);
}
void Wave_Reader(uint8_t *data, uint32_t offset, uint32_t size)
{
uint32_t i;
for (i = 0; i < size; i += 2) {
audio_buffer[i / 2] = (uint16_t)data[offset + i + 1] << 8 | (uint16_t)data[offset + i];
}
}
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
SPI_Configuration();
DMA_Configuration();
CS4344_Init();
uint8_t *wav_data;
uint32_t wav_size;
uint32_t wav_freq;
uint32_t wav_samples;
if (Wave_ReadFile("test.wav", &wav_data, &wav_size, &wav_freq, &wav_samples) != 0) {
// Error reading wave file
while (1);
}
audio_buffer_size = AUDIO_BUFFER_SIZE;
Wave_Reader(wav_data, 44, AUDIO_BUFFER_SIZE * sizeof(uint16_t));
audio_buffer_index = AUDIO_BUFFER_SIZE;
DMA_Cmd(DMA1_Stream7, ENABLE);
SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx, ENABLE);
while (audio_buffer_size > 0) {
// Wait for DMA to finish
}
free(wav_data);
while (1);
}
```
该程序使用DMA和I2S接口将WAVE格式的音频数据发送到CS4344芯片,实现音频播放功能。其中,Wave_Reader函数用于从WAVE文件中读取音频数据并将其转换为16位PCM格式。CS4344_Init函数用于初始化CS4344芯片的各种寄存器设置。DMA1_Stream7_IRQHandler函数用于处理DMA传输完成中断。在main函数中,程序首先读取WAVE文件中的音频数据,然后将其发送到CS4344芯片。在DMA传输完成后,程序通过轮询等待音频数据的发送完成,直到音频数据全部发送完毕。
i2s2
I2S(Inter-IC Sound)是一种用于数字音频传输的串行接口标准。在STM32中,I2S接口可以通过硬件或软件方式实现。其中,I2S2是STM32的一个硬件I2S接口,它可以与外部音频设备进行通信。
在使用I2S2之前,需要进行一些初始化配置,包括时钟配置、GPIO配置、I2S配置等。以下是一个简单的I2S2初始化代码示例:
```
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE); // 使能SPI3时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_DMA1, ENABLE); // 使能GPIOC和DMA1时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_12 | GPIO_Pin_14; // 配置PC10、PC12和PC14引脚
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // 复用模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; // GPIO速度100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 推挽输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; // 无上下拉
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_SPI3); // 配置PC10引脚为SPI3时钟线
GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_SPI3); // 配置PC12引脚为SPI3 MOSI线
GPIO_PinAFConfig(GPIOC, GPIO_PinSource14, GPIO_AF_SPI3); // 配置PC14引脚为SPI3 MISO线
SPI_I2S_DeInit(SPI3); // I2S3复位
SPI_I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_48k; // 音频采样频率
SPI_I2S_InitStructure.I2S_Standard = I2S_Standard_Phillips; // I2S标准
SPI_I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b; // 数据格式为16位
SPI_I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low; // 时钟极性为低电平
SPI_I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx; // 主发送模式
SPI_I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable; // MCLK输出禁止
SPI_I2S_Init(SPI3, &SPI_I2S_InitStructure);
DMA_DeInit(DMA1_Stream4); // DMA1数据流4复位
DMA_InitStructure.DMA_Channel = DMA_Channel_0; // DMA通道0
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI3->DR); // 外设地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)I2S2_Buffer; // 存储器地址
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; // 存储器到外设模式
DMA_InitStructure.DMA_BufferSize = I2S2_BufferSize; // 数据缓冲区大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; // 禁止外设地址自增
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; // 允许存储器地址自增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; // 外设数据大小为16位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; // 存储器数据大小为16位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; // 循环传输模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; // DMA优先级高
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable; // 允许FIFO模式
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; // FIFO阈值为半满
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; // 存储器传输突发单次
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; // 外设传输突发单次
DMA_Init(DMA1_Stream4, &DMA_InitStructure);
SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx, ENABLE); // I2S3 DMA使能
DMA_Cmd(DMA1_Stream4, ENABLE); // DMA1数据流4使能
```
以上代码实现了I2S2的初始化配置,包括SPI3时钟使能、GPIO配置、I2S配置、DMA配置等。其中,DMA可以实现数据的高速传输,通过循环传输模式可以实现连续的音频数据传输。
在实际使用中,需要根据具体的外部音频设备来调整I2S2接口的配置参数。
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