最近在做W25X16的SPI实验，问题是读取数据总是出错

Xavier00 · 发表于 2015-7-15 18:14:54

使用的是mini板，是用库函数的编写方式，现在的问题是无论输入什么指令读出的数据总是0x14,不明白……

这个是spi的初始化
void SPI_FLASH_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

//Enable SPI1 and GPIO clcoks
/*!< 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_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOD, ENABLE);

//SPI_FlASH_SPI Perioh clock Enable
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);

//AFIO Pweiph clock Enable
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

//Configure SPI_FLASH_SPI Pins:SCK
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//Configure SPI_FLASH_SPI pins: MISO;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode__AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//Configure SPI_FLASH_SPI pins: MOSI ;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

//Configure SPI_FLASH_SPI_CS_PIN pin: SPI_FLASH Card CS pin ;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2| GPIO_Pin_3 | GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_SetBits(GPIOA, GPIO_Pin_2);
GPIO_SetBits(GPIOA, GPIO_Pin_3);

//Deselect the FLASH: Chip Select high
SPI_FLASH_CS_HIGH();

//SPI1 configuration
// W25X16: data input on the DIO pin is sampled on the rising edge of the CLK.
// Data on the DO and DIO pins are clocked out on the falling edge of CLK.
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_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

//Enable SPI1
SPI_Cmd(SPI1, ENABLE);
}