求助STM32F407配置PA15 PB3 PB4 PB5用作SPI3问题

bincc123 · 发表于 2022-6-29 21:10:48

大家好：
         请教大家一个问题，我在一个项目中使用STM32F407的PA15 、PB3、 PB4 、PB5分别用作SPI3的CS、SCK、MISO、MOSI但是没有相应，一直在while (SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_TXE) == RESET){}里面。
         初始化SPI如下：
      (1)配置CS
      GPIO_InitTypeDef  GPIO_InitStructure;
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//
RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);//
//GPIOA15
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;//PA15
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//êä3ö
   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//íÆíìêä3ö
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//éÏà-
   GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉ
   MCP23S17_CS = 1; //SPI FLASH2»Ñ¡ÖD
SPI3_Init();    //3õê¼»ˉSPI
SPI3_SetSpeed(SPI_BaudRatePrescaler_8); //éèÖÃÎa 42/8Mhz
   (2)配置SCK、MISO、MOSI
      GPIO_InitTypeDef  GPIO_InitStructure;
  SPI_InitTypeDef SPI_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);

  //GPIOFB3,4,53õê¼»ˉéèÖÃ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);ˉ

GPIO_PinAFConfig(GPIOB,GPIO_PinSource3,GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_SPI3);

//ÕaàïÖ»Õë¶ÔSPI¿ú3õê¼»ˉ
RCC_APB2PeriphResetCmd(RCC_APB1Periph_SPI3,ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB1Periph_SPI3,DISABLE);

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_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI3, &SPI_InitStructure);

SPI_Cmd(SPI3, ENABLE); //ê1ÄüSPIíaéè

SPI3_ReadWriteByte(0xff);//Æô¶ˉ′«êä

   由于PA15 、PB3、 PB4 复位后默认为JTDI、NJTRST、JTDO功能。我需要怎么样重新映射这个三个IO的功能？STM407没有像STM103那样有GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);    /*使能SWD 禁用JTAG*/
  函数。
   网上说把PA15用作AF,这个试过了也不行。