本人在做stm32f407采用spi驱动sd卡，实现sd卡的读写

ahsssxd · 发表于 2015-3-9 13:11:34

本人在做stm32f407采用spi驱动sd卡，实现sd卡的读写，编写spi初始化的时候怎么样知道初始化正确呢

login_FAE · 发表于 2015-3-9 13:52:41

仿真看寄存器

释怀过客 · 发表于 2015-3-9 15:08:11

我也在做这个，有完整的程序参考一下吗

ahsssxd · 发表于 2015-3-9 15:37:17

回复【3楼】释怀过客:
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不知道你的进展怎么样了，我今天调了一天，这是初始化函数，不知道可以问题啊
#include "spi.h"
#include "usart.h"


void SPI2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
  SPI_InitTypeDef  SPI_InitStructure;

RCC_APB2PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE );//PORTB?±??????

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  //PB13/14/15???????ì????
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOB,GPIO_PinSource13,GPIO_AF_SPI2); //PB13
GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_SPI2); //PB14
GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_SPI2); //PB15

//??????????SPI????????
//   RCC_APB2PeriphResetCmd(RCC_APB1Periph_SPI2,ENABLE);//????SPI2
// RCC_APB2PeriphResetCmd(RCC_APB1Periph_SPI2,DISABLE);//????????SPI2

RCC_APB1PeriphClockCmd( RCC_APB1Periph_SPI2,  ENABLE );//SPI2?±??????
//GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);  //PB13/14/15????
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  //?è??SPI???ò?ò?????ò??????????:SPI?è???????????ò?????¤
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //?è??SPI?¤×÷????:?è?????÷SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //?è??SPI???????ó??:SPI·???????8?????á??
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //???????????±????????:?±???ü????
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //?????????????????±????
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS???????????¨NSS???????????í???¨????SSI???????í:????NSS??????SSI??????
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //?¨???¨?????¤·???????:?¨?????¤·?????256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //???¨??????????MSB??????LSB??????:??????????MSB??????
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC?????????à????
SPI_Init(SPI2, &SPI_InitStructure);  //?ù??SPI_InitStruct?????¨???????????????èSPIx?????÷

SPI_Cmd(SPI2, ENABLE); //????SPI???è

SPI2_ReadWriteByte(0xff);//????????

}
//SPI ?????è??????
//SpeedSet:
//SPI_BaudRatePrescaler_2   2·???
//SPI_BaudRatePrescaler_8   8·???
//SPI_BaudRatePrescaler_16  16·???
//SPI_BaudRatePrescaler_256 256·???

void SPI2_SetSpeed(u8 SpeedSet)
{
SPI2->CR1&=0XFFC7;
SPI2->CR1|=SpeedSet;
SPI_Cmd(SPI2,ENABLE);
}