STM32F4 SPI2 + W25Q出现问题

JunjiYANG · 发表于 2018-6-13 20:54:20

参照探索板，将驱动从SPI1改为的SPI2的，读flash ID一直是FFFF
用SPI2一直发送数据测出MOSI一直低电平，SCK一直高电平，求解。。。。
片选PE15 SPI2用的是PB 10 、14、5[mw_shl_code=c,true]
void SPI2_Init(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;
  SPI_InitTypeDef  SPI_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

GPIO_PinAFConfig(GPIOB,GPIO_PinSource10,GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_SPI2);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_14|GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);ˉ

RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2,ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2,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(SPI2, &SPI_InitStructure);

SPI_Cmd(SPI2, ENABLE);

SPI2_ReadWriteByte(0xff);
} [/mw_shl_code]
下面是W25Q的初始化
[mw_shl_code=applescript,true]
void W25QXX_Init(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);//ê1ÄüGPIOEê±Öó

//GPIOE15
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

W25QXX_CS=1;
SPI2_Init();
SPI2_SetSpeed(SPI_BaudRatePrescaler_8);
W25QXX_TYPE=W25QXX_ReadID();
}
[/mw_shl_code]