刚学STM32，用stm32f207 spi和外部芯片si443x通信，始终没成功，求助。已经好几天了，不知道怎么下手，下面贴出代码。
[mw_shl_code=c,true]void Spi2_4438_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; SPI_InitTypeDef SPI_InitStructure; /* 使能gpio时钟和SPI2 */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); /* Enable SCK, MOSI, MISO and NSS GPIO clocks using RCC_AHB1PeriphClockCmd()*/ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); //? /* Connect PB12 to SPI2_SCK */ GPIO_PinAFConfig(GPIOB, GPIO_PinSource12, GPIO_AF_SPI2); /* Connect PB14 to SPI2_MISO */ GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2); /* Connect PB15 to SPI2_MOSI */ GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2); /* Configure SPI2 pins as alternate function (No need to configure PB13 since NSS will be managed by software) */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_14|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_UP; GPIO_Init(GPIOB, &GPIO_InitStructure); /*spi CONFIGURATION*/ SPI_Cmd(SPI2, DISABLE); //使能SPI2 SPI_InitStructure.SPI_Direction =SPI_Direction_2Lines_FullDuplex; //双线输入输出全双工模式 SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置为SPI的主机模式 SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //SPI数据大小：发送8位帧数据结构 SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //设备空闲状态时同步时钟SCK的状态，High表示高电平，Low表示低电平 SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //时钟相位，1表示在同步时钟SCK的奇数沿边采样，2表示偶数沿边采样 SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS由软件控件片选 SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;//时钟的预分频值 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //MSB高位在前 SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC较验和的多项式 SPI_Init(SPI2, &SPI_InitStructure); //初始化SPI2的配置项 SPI_Cmd(SPI2, ENABLE); //使能SPI2 } void main(void) { // init_gpled(); //亮灯 // 初始化spi uint16_t tmp; tmp=5; Spi2_4438_Init(); while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET) { } SPI_I2S_SendData(SPI2,0); while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET) { } SPI_I2S_ReceiveData(SPI2); while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET) { } SPI_I2S_SendData(SPI2,0x0c); while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET) { } tmp=SPI_I2S_ReceiveData(SPI2); if(tmp!=0) { init_gpled(); } }[/mw_shl_code] [mw_shl_code=c,true] [/mw_shl_code] [mw_shl_code=c,true]下面是io接口：[/mw_shl_code]
用iar运行的时候每次到 [mw_shl_code=c,true]while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET)[/mw_shl_code] 就下不去，不知道为什么，@正点原子大神，救救我。