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最近工作中调试SPI开始以为很简单例程资源挺多,但是自己亲自调试上才发现,这个东西不是很好调,对我这样的菜鸟来说。所以想分享下,我自己用F412和f103测试SPI的程序。
今天最终把工作中的SPI调试通了,但是还是对SPI不很了解,简单说下我的感觉不一定对。在用硬件片选时调试会麻烦些,但是数据通信应该更稳定些吧。数据传输不对时可以选择每一字节收发时进行延时一次。初始化时可以进行一次收发。接下来复制下我F412 SPI主配置的源码。
- void SPI_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- SPI_InitTypeDef SPI_InitStructure;
- /* Peripheral Clock Enable -------------------------------------------------*/
- /* Enable the SPI clock */
- SPIx_CLK_INIT(SPIx_CLK, ENABLE);
- /* Enable GPIO clocks */
- RCC_AHB1PeriphClockCmd(SPIx_SCK_GPIO_CLK | SPIx_MISO_GPIO_CLK | SPIx_MOSI_GPIO_CLK, ENABLE);
- /* SPI GPIO Configuration --------------------------------------------------*/
- /* GPIO Deinitialisation */
- GPIO_DeInit(SPIx_SCK_GPIO_PORT);
- GPIO_DeInit(SPIx_MISO_GPIO_PORT);
- GPIO_DeInit(SPIx_MOSI_GPIO_PORT);
- //GPIO_DeInit(SPIx_NSS_GPIO_PORT);
- /* Connect SPI pins to AF5 */
- GPIO_PinAFConfig(SPIx_SCK_GPIO_PORT, SPIx_SCK_SOURCE, SPIx_SCK_AF);
- GPIO_PinAFConfig(SPIx_MISO_GPIO_PORT, SPIx_MISO_SOURCE, SPIx_MISO_AF);
- GPIO_PinAFConfig(SPIx_MOSI_GPIO_PORT, SPIx_MOSI_SOURCE, SPIx_MOSI_AF);
- //GPIO_PinAFConfig(SPIx_NSS_GPIO_PORT, SPIx_NSS_SOURCE, SPIx_NSS_AF);
- 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_DOWN;
- /* SPI SCK pin configuration */
- GPIO_InitStructure.GPIO_Pin = SPIx_SCK_PIN;
- GPIO_Init(SPIx_SCK_GPIO_PORT, &GPIO_InitStructure);
- /* SPI MISO pin configuration */
- GPIO_InitStructure.GPIO_Pin = SPIx_MISO_PIN;
- GPIO_Init(SPIx_MISO_GPIO_PORT, &GPIO_InitStructure);
- /* SPI MOSI pin configuration */
- GPIO_InitStructure.GPIO_Pin = SPIx_MOSI_PIN;
- GPIO_Init(SPIx_MOSI_GPIO_PORT, &GPIO_InitStructure);
- RCC_AHB1PeriphClockCmd(SPIx_NSS_GPIO_CLK, ENABLE);
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
- GPIO_InitStructure.GPIO_Pin = SPIx_NSS_PIN;
- GPIO_Init(SPIx_NSS_GPIO_PORT, &GPIO_InitStructure);
- HAL_SPIFLASH_CS_HIGH();
- /* SPI configuration -------------------------------------------------------*/
- SPI_I2S_DeInit(SPIx_FLASH);
- SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
- 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_16;
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
- //SPI_InitStructure.SPI_CRCPolynomial = 7;
- /* Configure the SPI interrupt priority
- NVIC_InitStructure.NVIC_IRQChannel = SPIx_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);*/
- SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
- SPI_Init(SPIx_FLASH, &SPI_InitStructure);
- /* Enable the SPI peripheral */
- SPI_Cmd(SPIx_FLASH, ENABLE);
- }
[color=rgb(51, 102, 153) !important]复制代码
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
这两个参数需要根据时序图决定,GPIO的初始化我有点懵了我这样初始化不知道对不对根据的事官方给的例程来的。希望有知道的不吝赐教。
f103 SPI从配置源码,采用硬件NSS.
- void HAL_SPIFLASH_Init(void)
- {
- SPI_InitTypeDef SPI_InitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
- //SPI_RCC_Configuration
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);
- //SPI_GPIO_Configuration
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- //GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
- //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
- //GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- //GPIO_Init(GPIOA, &GPIO_InitStructure);
- //HAL_SPIFLASH_CS_HIGH();
- //SPI_Configuration
- SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
- SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
- 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_Hard;
- SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
- //SPI_InitStructure.SPI_CRCPolynomial = 7;
- SPI_Init(SPI_FLASH, &SPI_InitStructure);
- SPI_Cmd(SPI_FLASH, ENABLE);
- }
[color=rgb(51, 102, 153) !important]复制代码
通用读写函数:
- UINT_8 HAL_SPIFLASH_WriteByte(UINT_8 u8Dat)
- {
- HAL_SPIFLASH_CS_LOW();
- while(SPI_I2S_GetFlagStatus(SPIx_FLASH, SPI_I2S_FLAG_TXE) == RESET);
- SPI_I2S_SendData(SPIx_FLASH, u8Dat);
- while(SPI_I2S_GetFlagStatus(SPIx_FLASH, SPI_I2S_FLAG_RXNE) == RESET);
- HAL_SPIFLASH_CS_HIGH();
- return SPI_I2S_ReceiveData(SPIx_FLASH);
- }
- UINT_8 HAL_SPIFLASH_ReadByte(void)
- {
- return HAL_SPIFLASH_WriteByte(DUMMY_BYTE);
- }
[color=rgb(51, 102, 153) !important]复制代码
希望分享的源码对需要的人有用。
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