Posted on August 20, 2014 at 03:11
Thank you very much for your help
Hello, I want to use SPI2 on STM32F103RB to communicate with RFM12 module but SPI does not work. Can you help me where is a problem?
This is the definitions:#define RFM_SPI2_PORT GPIOB#define RFM_GPIO_CLK RCC_APB2Periph_GPIOB#define RFM_SPI2_IRQ GPIO_Pin_11#define RFM_SPI2_NSS GPIO_Pin_12#define RFM_SPI2_SCK GPIO_Pin_13#define RFM_SPI2_MISO GPIO_Pin_14#define RFM_SPI2_MOSI GPIO_Pin_15void init_RFM_SPI2master(void){GPIO_InitTypeDef gpioinit;SPI_InitTypeDef SPI_InitStructure; RCC_APB2PeriphClockCmd(RFM_GPIO_CLK, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); gpioinit.GPIO_Mode=GPIO_Mode_AF_PP; gpioinit.GPIO_Speed=GPIO_Speed_50MHz; gpioinit.GPIO_Pin = RFM_SPI2_MOSI|RFM_SPI2_SCK; GPIO_Init(RFM_SPI2_PORT, &gpioinit); gpioinit.GPIO_Mode=GPIO_Mode_IPU; gpioinit.GPIO_Pin=RFM_SPI2_MISO; GPIO_Init(RFM_SPI2_PORT, &gpioinit); gpioinit.GPIO_Mode=GPIO_Mode_Out_PP; gpioinit.GPIO_Pin=RFM_SPI2_NSS; GPIO_Init(RFM_SPI2_PORT, &gpioinit); GPIO_SetBits(RFM_SPI2_PORT,RFM_SPI2_NSS); gpioinit.GPIO_Mode=GPIO_Mode_IN_FLOATING; gpioinit.GPIO_Pin=RFM_SPI2_IRQ; GPIO_Init(RFM_SPI2_PORT, &gpioinit); SPI_Cmd(SPI2, DISABLE); SPI_I2S_DeInit(SPI2); 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_Low; SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStructure.SPI_CRCPolynomial = 7; SPI_Init(SPI2, &SPI_InitStructure); SPI_Cmd(SPI2, ENABLE);}I send these commands: RFM12_ClrNSEL(); while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET); SPI_I2S_SendData(SPI2, 0x80E7); while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET); keyreading = SPI_I2S_ReceiveData(SPI2); while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_BSY) == SET); RFM12_SetNSEL();This is a picture from logic analyzer.Thank you very much for your help
