stm32开发3D打印机（五）——TF卡spi协议与FATFS文件系统（已完成）
借鉴于正点原子stm32 Mini板
下方的代码仅为对TF卡的初始化
FATFS移植方法请看正点原子Mini板教程，以及建议完成USMART的移植
因为TFATFS移植与USMATRT没有什么好写的，而且在下方的链接：正点原子教程已经有详细的教程了，所以跳过了TATFS与USMART。
链接：https://pan.baidu.com/s/1_S0394ZSRZaNxgz3QIbstA
提取码：6718
电路图如下所示
各引脚如下所示
| TF_SS | PA4 |
|---|---|
| TF_SCLK | PA5 |
| TF_MISO | PA6 |
| TF_MOSi | PB5 |
| TF_SW | PB11 |
初始化SPI
u8 SPI1_ReadWriteByte(u8 byte)
{
u8 retry=0;
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
{
retry++;
if(retry>200)return 0;
}
SPI_I2S_SendData(SPI1, byte); //ͨ¹ýÍâÉèSPIx·¢ËÍÒ»¸öÊý¾Ý
retry=0;
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)//¼ì²éÖ¸¶¨µÄSPI±ê־λÉèÖÃÓë·ñ:½ÓÊÜ»º´æ·Ç¿Õ±ê־λ
{
retry++;
if(retry>200)return 0;
}
return SPI_I2S_ReceiveData(SPI1); //·µ»Øͨ¹ýSPIx×î½ü½ÓÊÕµÄÊý¾Ý
}
void SPI1_SetSpeed(u8 SpeedSet)
{
SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.SPI_BaudRatePrescaler = SpeedSet ;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1,ENABLE);
}
u8 SD_SPI_ReadWriteByte(u8 data)
{
return SPI1_ReadWriteByte(data);
}
void SPI1_Init()
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1|RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_GPIOB, ENABLE);//?? SPI1 ??
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_5;//PB3~5¸´Óù¦ÄÜÊä³ö
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸´Óù¦ÄÜ
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍìÊä³ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//ÉÏÀ
GPIO_Init(GPIOA, &GPIO_InitStructure);//³õʼ»¯
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_Init(GPIOB, &GPIO_InitStructure);//³õʼ»¯
GPIO_SetBits(GPIOB,GPIO_Pin_5);//PA2.3.4ÉÏÀ
GPIO_SetBits(GPIOA,GPIO_Pin_5|GPIO_Pin_6);//PA2.3.4ÉÏÀ
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //ÉèÖÃSPIµ¥Ïò»òÕßË«ÏòµÄÊý¾Ýģʽ:SPIÉèÖÃΪ˫ÏßË«ÏòÈ«Ë«¹¤
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //ÉèÖÃSPI¹¤×÷ģʽ:ÉèÖÃΪÖ÷SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //ÉèÖÃSPIµÄÊý¾Ý´óС:SPI·¢ËͽÓÊÕ8λ֡½á¹¹
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //´®ÐÐͬ²½Ê±ÖӵĿÕÏÐ״̬Ϊ¸ßµçƽ
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //´®ÐÐͬ²½Ê±Öӵĵڶþ¸öÌø±äÑØ£¨ÉÏÉý»òϽµ£©Êý¾Ý±»²ÉÑù
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSSÐźÅÓÉÓ²¼þ£¨NSS¹Ü½Å£©»¹ÊÇÈí¼þ£¨Ê¹ÓÃSSI룩¹ÜÀí:ÄÚ²¿NSSÐźÅÓÐSSIλ¿ØÖÆ
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //¶¨Ò岨ÌØÂÊÔ¤·ÖƵµÄÖµ:²¨ÌØÂÊÔ¤·ÖƵֵΪ256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //Ö¸¶¨Êý¾Ý´«Êä´ÓMSBλ»¹ÊÇLSBλ¿ªÊ¼:Êý¾Ý´«Êä´ÓMSBλ¿ªÊ¼
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRCÖµ¼ÆËãµÄ¶àÏîʽ
SPI_Init(SPI1, &SPI_InitStructure); //¸ù¾ÝSPI_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèSPIx¼Ä´æÆ÷
GPIO_PinAFConfig(GPIOA,GPIO_PinSource5,GPIO_AF_SPI1); //PB3 ??? SPI1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource6,GPIO_AF_SPI1); //PB4 ??? SPI1
GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_SPI1); //PB5 ??? SPI1
SPI_Cmd(SPI1, ENABLE); //ʹÄÜSPIÍâÉè
SPI1_ReadWriteByte(0xff);//Æô¶¯´«Êä
printf("SPI_Init Finsh\r\n\r\n");
}
u8 SD_Initialize(void)
{
u8 r1; //
u16 retry; //
u8 buf[4];
u16 i;
SD_SPI_Init(); //
SD_SPI_SpeedLow(); //
for(i=0;i<10;i++)SPI1_ReadWriteByte(0XFF);
retry=20;
do
{
r1=SD_SendCmd(CMD0,0,0x95);
}while((r1!=0X01) && retry--);
SD_Type=0;
if(r1==0X01)
{
if(SD_SendCmd(CMD8,0x1AA,0x87)==1)//SD V2.0
{
for(i=0;i<4;i++)buf[i]=SPI1_ReadWriteByte(0XFF); //Get trailing return value of R7 resp
if(buf[2]==0X01&&buf[3]==0XAA)//?????2.7~3.6V
{
retry=0XFFFE;
do
{
SD_SendCmd(CMD55,0,0X01); //??CMD55
r1=SD_SendCmd(CMD41,0x40000000,0X01);//??CMD41
}while(r1&&retry--);
if(retry&&SD_SendCmd(CMD58,0,0X01)==0)//??SD2.0?????
{
for(i=0;i<4;i++)buf[i]=SPI1_ReadWriteByte(0XFF);//??OCR?
if(buf[0]&0x40)SD_Type=SD_TYPE_V2HC;//printf("SD_TYPE_V2HC"); //??CCS
else SD_Type=SD_TYPE_V2;//printf("SD_TYPE_V2");
}
}
}
else//SD V1.x/ MMC V3
{
SD_SendCmd(CMD55,0,0X01); //??CMD55
r1=SD_SendCmd(CMD41,0,0X01); //??CMD41
if(r1<=1)
{
SD_Type=SD_TYPE_V1;
// printf("SD_TYPE_V1");
retry=0XFFFE;
do //????IDLE??
{
SD_SendCmd(CMD55,0,0X01); //??CMD55
r1=SD_SendCmd(CMD41,0,0X01);//??CMD41
}while(r1&&retry--);
}else
{
SD_Type=SD_TYPE_MMC;//MMC V3
// printf("SD_TYPE_MMC");
retry=0XFFFE;
do //????IDLE??
{
r1=SD_SendCmd(CMD1,0,0X01);//??CMD1
}while(r1&&retry--);
}
if(retry==0||SD_SendCmd(CMD16,512,0X01)!=0)SD_Type=SD_TYPE_ERR;//????
}
}
SD_DisSelect();//????
SD_SPI_SpeedHigh(); //¸ßËÙģʽ
printf("finsh");
if(SD_Type)
return 0; //SD¿¨³õʼ»¯³É¹¦
else if(r1)
return r1; //´íÎó
else
return 0xAA; //ÆäËû´íÎó
}
若初始化函数SD_Initialize（）返回0，则初始化成功
int main()
{
allinit();
while(SD_Initialze()) //对SD卡进行初始化
printf("SD Init error");
printf("SD Init finsh\r\n");
while(exfuns_init()) //为FATFS申请内存
printf("error\r\n");
f_mount(fs[0],"0:",1); //挂载TF卡
/即可使用FATFS库内的函数
}