STM32F10XX中SPI的DMA发送数据
2014-03-17 21:44
344 查看
参考资料: http://blog.csdn.net/jdh99/article/details/7603029 http://www.openedv.com/posts/list/3159.htm
上面提到的两篇博文比较详细深刻的说明了DMA的工作方式以及SPI的DMA传输方式的特点。结合对Stm32F103VET6中SPI的DMA传输方式的配置和学习谈谈感受,在看下面的内容之前请先看上面的两篇参考博文,这里就不在说明。
要使用SPI的DMA功能,首先配置好SPI外设,这里以SPI1为例子。下面的代码初始化了SPI1对应的GPIO以及SPI1工作的模式。
void SpiCC3000Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/*!< Disable SPI */
SPI_Cmd(SPI_USED, DISABLE);
/*!< DeInitializes the SPI */
SPI_I2S_DeInit(SPI_USED);
/*!< SPI Periph clock disable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2 , DISABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 , DISABLE);
/*Enable SPI2 Clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE);
/*Enable SPI1 Clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 |RCC_APB2Periph_GPIOA,ENABLE);
/*Config SCLK and MOSI */
GPIO_InitStructure.GPIO_Pin = SPI_CLK_PIN| SPI_MOSI_PIN;//
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//AF_PP
GPIO_Init(SPI_PORT, &GPIO_InitStructure);
/*!< Configure SPI pins: MISO */
GPIO_InitStructure.GPIO_Pin = SPI_MISO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(SPI_PORT, &GPIO_InitStructure);
/*!< Configure SPI pins: CS output high */
GPIO_InitStructure.GPIO_Pin = SPI_CS_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SPI_PORT, &GPIO_InitStructure);
GPIO_SetBits(SPI_PORT,SPI_CS_PIN);
/*!< CC3000 SPI Init */
SPI_StructInit(&SPI_InitStructure);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;/* The buadrate is a fraction of the 72MHz clock*/
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI_USED, &SPI_InitStructure);
SPI_SSOutputCmd(SPI_USED,ENABLE);//NSS(CS)
SPI_Cmd(SPI_USED, ENABLE);
/*Configure SPI for DMA Operation*/
#if defined(ENABLE_SPI_DMA)
SpiCC3000DMAInit();
#else
SpiRxInterruptClkInit();
#endif
} 在配置好SPI1以后,配置DMA1功能(选择SPI1的Tx连接到DMA上),因为SPI1对应的DMA功能由DMA1来实现。 下面函数中的DMA时钟将在调用它的函数中开启。
接下来就是中断处理函数了,响应传输完成中断的产生void DMA1_Channel3_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC3)==SET)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_ResetBits(GPIOC,GPIO_Pin_6);
}
DMA_ClearITPendingBit(DMA1_IT_TC3);
}最后启动DMA传输是通过DMA_Cmd(SPI_DMA_TX_CHANNEL, ENABLE) 这句话实现,当DMA通道被使能以后,它就自动开始传输数据,而不影响CPU其干其它事情,直到DMA传输完数据产生中断时,CPU才会去处理中断函数。
上面提到的两篇博文比较详细深刻的说明了DMA的工作方式以及SPI的DMA传输方式的特点。结合对Stm32F103VET6中SPI的DMA传输方式的配置和学习谈谈感受,在看下面的内容之前请先看上面的两篇参考博文,这里就不在说明。
要使用SPI的DMA功能,首先配置好SPI外设,这里以SPI1为例子。下面的代码初始化了SPI1对应的GPIO以及SPI1工作的模式。
void SpiCC3000Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/*!< Disable SPI */
SPI_Cmd(SPI_USED, DISABLE);
/*!< DeInitializes the SPI */
SPI_I2S_DeInit(SPI_USED);
/*!< SPI Periph clock disable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2 , DISABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 , DISABLE);
/*Enable SPI2 Clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE);
/*Enable SPI1 Clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 |RCC_APB2Periph_GPIOA,ENABLE);
/*Config SCLK and MOSI */
GPIO_InitStructure.GPIO_Pin = SPI_CLK_PIN| SPI_MOSI_PIN;//
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//AF_PP
GPIO_Init(SPI_PORT, &GPIO_InitStructure);
/*!< Configure SPI pins: MISO */
GPIO_InitStructure.GPIO_Pin = SPI_MISO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(SPI_PORT, &GPIO_InitStructure);
/*!< Configure SPI pins: CS output high */
GPIO_InitStructure.GPIO_Pin = SPI_CS_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SPI_PORT, &GPIO_InitStructure);
GPIO_SetBits(SPI_PORT,SPI_CS_PIN);
/*!< CC3000 SPI Init */
SPI_StructInit(&SPI_InitStructure);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;/* The buadrate is a fraction of the 72MHz clock*/
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI_USED, &SPI_InitStructure);
SPI_SSOutputCmd(SPI_USED,ENABLE);//NSS(CS)
SPI_Cmd(SPI_USED, ENABLE);
/*Configure SPI for DMA Operation*/
#if defined(ENABLE_SPI_DMA)
SpiCC3000DMAInit();
#else
SpiRxInterruptClkInit();
#endif
} 在配置好SPI1以后,配置DMA1功能(选择SPI1的Tx连接到DMA上),因为SPI1对应的DMA功能由DMA1来实现。 下面函数中的DMA时钟将在调用它的函数中开启。
void C3000_DMA_Config(SPI_DMADirection_TypeDef Direction, uint8_t* buffer, uint16_t NumData) { #if defined(ENABLE_SPI_DMA) DMA_InitTypeDef DMA_InitStructure; /* Initialize the DMA_PeripheralBaseAddr member */ DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t )&SPI1->DR; //SPI_DR_BASE; // //DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t )&SPI2->DR; //SPI_DR_BASE; // /* Initialize the DMA_MemoryBaseAddr member */ DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)buffer; /* Initialize the DMA_PeripheralInc member */ DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; /* Initialize the DMA_MemoryInc member */ DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; /* Initialize the DMA_PeripheralDataSize member */ DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; /* Initialize the DMA_MemoryDataSize member */ DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; /* Initialize the DMA_Mode member */ //yichuan DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; /* Initialize the DMA_Priority member */ DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; /* Initialize the DMA_M2M member */ DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; /* If using DMA for Reception */ if (Direction == SPI_DMA_RX) { /* Initialize the DMA_DIR member */ DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; /* Initialize the DMA_BufferSize member */ DMA_InitStructure.DMA_BufferSize = NumData; DMA_DeInit(SPI_DMA_RX_CHANNEL); DMA_Init(SPI_DMA_RX_CHANNEL, &DMA_InitStructure); } /* If using DMA for Transmission */ else if (Direction == SPI_DMA_TX) { /* Initialize the DMA_DIR member */ DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; /* Initialize the DMA_BufferSize member */ DMA_InitStructure.DMA_BufferSize = NumData; DMA_DeInit(SPI_DMA_TX_CHANNEL); DMA_Init(SPI_DMA_TX_CHANNEL, &DMA_InitStructure); } #endif }配置好DMA1和SPI1后,要做的事情就是把二者联合起来,且配置DMA1的发送完成中断。
void SpiCC3000DMAInit(void) { RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); DMA_DeInit(SPI_DMA_RX_CHANNEL); DMA_DeInit(SPI_DMA_TX_CHANNEL); /* Configure and enable SPI DMA TX Channel interrupt */ // NVIC_RxInt_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn; //SPI2 TX NVIC_RxInt_InitStructure.NVIC_IRQChannel = DMA1_Channel3_IRQn;//SPI1 TX // not config the Rx channel NVIC_RxInt_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_RxInt_InitStructure.NVIC_IRQChannelSubPriority = 0;//0 NVIC_RxInt_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_RxInt_InitStructure); /* Configure DMA Peripheral but don't send data*/ C3000_DMA_Config(SPI_DMA_RX, (uint8_t*)wlan_rx_buffer,0); //C3000_DMA_Config(SPI_DMA_TX, (uint8_t*)wlan_tx_buffer,0); C3000_DMA_Config(SPI_DMA_TX, (uint8_t*)wlan_tx_buffer,1700); //buffer is 1700 /* Enable SPI DMA request */ SPI_I2S_DMACmd(SPI_USED,SPI_I2S_DMAReq_Tx, ENABLE); SPI_I2S_DMACmd(SPI_USED,SPI_I2S_DMAReq_Rx, ENABLE); /* Enable the DMA Channels Interrupts */ /*It should be put after the DMA config */ DMA_ITConfig(SPI_DMA_TX_CHANNEL, DMA_IT_TC, ENABLE); /* Enable DMA RX Channel */ DMA_Cmd(SPI_DMA_RX_CHANNEL, ENABLE); /*Note: Enable the SPI_DMA Channel,it begin SPI translate*/ /* Enable DMA TX Channel ,begin the dma translate*/ DMA_Cmd(SPI_DMA_TX_CHANNEL, ENABLE); }这里要强调的是:使能DMA中断标志的语句DMA_ITConfig(SPI_DMA_TX_CHANNEL, DMA_IT_TC, ENABLE); 应当放到DMA1配置完以后,不然发送数据完成以后,不会进入中断处理函数,就是相当于发送完成后产生中断的这个功能并没有配置成功,如果放到DMA1配置前面。下面的图片是参考手册中关于DMA的配置过程,其中中断的使能在第六步,所以应当在DMA初始化完成后,再使能中断功能。
接下来就是中断处理函数了,响应传输完成中断的产生void DMA1_Channel3_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC3)==SET)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_ResetBits(GPIOC,GPIO_Pin_6);
}
DMA_ClearITPendingBit(DMA1_IT_TC3);
}最后启动DMA传输是通过DMA_Cmd(SPI_DMA_TX_CHANNEL, ENABLE) 这句话实现,当DMA通道被使能以后,它就自动开始传输数据,而不影响CPU其干其它事情,直到DMA传输完数据产生中断时,CPU才会去处理中断函数。
相关文章推荐
- STM32L1XX使用HAL_UART_Transmit_DMA发送串口数据
- 32 ART DMA 接收未知长度的数据和发送
- STM32 DMA 应用之(二) DMA 串口 数据传输--发送
- Android 7.0 SPI DMA模式下传输数据丢失问题
- 关于RS485通讯中使用STM32串口以DMA方式发送数据丢失字节的问题
- STM8L 在USART中使用DMA来发送与接收数据
- stm32_DMA采集一个AD数据_并通过DMA向串口发送
- STM32 UART1 DMA 发送数据
- STM32实现USART+DMA接收未知长度的数据和发送
- stm32 SPI DMA读取ADS8345数据
- STM32F3使用USART串口DMA发送数据,使用蓝牙发送
- STM32L431之SPI从模式使用DMA时数据偏移3个字节
- STM32上SPI+DMA实现大批量读取flash数据
- STM32 USART DMA 多次发送数据
- STM32:DMA方式接收SPI总线数据,并按照协议进行处理
- 串口以DMA方式发送(TX)数据
- STM32F429 DMA串口数据发送
- STM32F4 UART1 DMA发送和接收不定长度数据
- STM32F4 UART1 DMA发送和接收不定长度数据