原子,你好 我现在想用2个STM32F407之间进行spi通信 一个做主,一个做从 2个都采用中断的方式进行接收。 比如2个cpu分别是A,B 就是首先A把数据发给B,B通过中断接收,然后B在把数据发给A,A也通过中断接收 但目前我的情况是可以A可以发出,B好像也接到了,但是B发回来时候就接不到了,或者是没有发出 我的连接方式是2个都用SPI3口,MISO,MOSI,CLK,NSS都是直连的。 程序如下: A的初始化:
void _Spi_Init(void) { GPIO_InitTypeDef GPIO_InitStructure;
/*!< Configure SPI_FLASH_SPI_CS_PIN pin: SPI_FLASH Card CS pin */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; GPIO_Init(GPIOA, &GPIO_InitStructure); /* Enable SPI1 and GPIO clocks */ /*!< SPI_FLASH_SPI_CS_GPIO, SPI_FLASH_SPI_MOSI_GPIO, SPI_FLASH_SPI_MISO_GPIO, SPI_FLASH_SPI_DETECT_GPIO and SPI_FLASH_SPI_SCK_GPIO Periph clock enable */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOB, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); /*!< SPI_FLASH_SPI Periph clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE); /*!< AFIO Periph clock enable */ //RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_AFIO, ENABLE); /*!< Remap SPI3 Pins */ //GPIO_PinRemapConfig(GPIO_Remap_SPI3,ENABLE); GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_SPI3); GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_SPI3); GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_SPI3);
/*!< Configure SPI_FLASH_SPI pins: SCK */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOC, &GPIO_InitStructure); /*!< Configure SPI_FLASH_SPI pins: MISO */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; GPIO_Init(GPIOC, &GPIO_InitStructure); /*!< Configure SPI_FLASH_SPI pins: MOSI */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_Init(GPIOC, &GPIO_InitStructure); /* Deselect the FLASH: Chip Select high */ GPIO_SetBits(GPIOA, GPIO_Pin_15); _Spi_Set_M(); }
void _Spi_Set_M(void) { SPI_InitTypeDef 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_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_ITConfig(SPI3, SPI_IT_RXNE, ENABLE); /* Enable SPI3 */ SPI_Cmd(SPI3, ENABLE); } B的初始化
void _Spi_Init(void) { GPIO_InitTypeDef GPIO_InitStructure;
/*!< Configure SPI_FLASH_SPI_CS_PIN pin: SPI_FLASH Card CS pin */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; GPIO_Init(GPIOA, &GPIO_InitStructure); /* Enable SPI1 and GPIO clocks */ /*!< SPI_FLASH_SPI_CS_GPIO, SPI_FLASH_SPI_MOSI_GPIO, SPI_FLASH_SPI_MISO_GPIO, SPI_FLASH_SPI_DETECT_GPIO and SPI_FLASH_SPI_SCK_GPIO Periph clock enable */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOB, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); /*!< SPI_FLASH_SPI Periph clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE); /*!< AFIO Periph clock enable */ //RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_AFIO, ENABLE); /*!< Remap SPI3 Pins */ //GPIO_PinRemapConfig(GPIO_Remap_SPI3,ENABLE); GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_SPI3); GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_SPI3); GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_SPI3);
/*!< Configure SPI_FLASH_SPI pins: SCK */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOC, &GPIO_InitStructure); /*!< Configure SPI_FLASH_SPI pins: MISO */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; GPIO_Init(GPIOC, &GPIO_InitStructure); /*!< Configure SPI_FLASH_SPI pins: MOSI */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_Init(GPIOC, &GPIO_InitStructure); /* Deselect the FLASH: Chip Select high */ GPIO_SetBits(GPIOA, GPIO_Pin_15); _Spi_Set_S(); } void _Spi_Set_S(void) { SPI_InitTypeDef SPI_InitStructure;
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_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_ITConfig(SPI3, SPI_IT_RXNE, ENABLE); /* Enable SPI3 */ SPI_Cmd(SPI3, ENABLE); }
中断的写法:(A,B都是这样个接收法) void SPI3_IRQHandler(void) { unsigned char tmp;
if(SPI_I2S_GetITStatus(SPI3,SPI_IT_RXNE)!=RESET){ SPI_I2S_ClearITPendingBit(SPI3, SPI_IT_RXNE); tmp=SPI_I2S_ReceiveData(SPI3); 。。。。略。。。 }
请问原子兄,这样有什么不可么? 或者我的原理是否存在问题呢? 还有,上电时候,必须先给A上电,然后给B,才能接到一次。 而且我已经共地了。
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