K027 基于51/STM32 SD_mini/Micro卡模块测试 串口打印读取值
一． 实现功能
上电后串口助手打印读取之前存储的数据
二． 硬件清单
- SD_mini/Micro卡模块
- STM32F103C8T6/STC89C52RC
- SWD或JLINK仿真器（直接用CH340串口模块烧录也行，不过注意配置BOOT）
- 杜邦线若干
三． 资料清单
程序代码
文档资料
四． 模块简介
1.基本参数
2.引脚说明
五． 接线
基于STM32 +模块接线
模块----------------------------------STM32
VCC-----------------------------------5V/3.3（有降压模块接5无降压模块接3.3）
GND-----------------------------------GND
OUT----------------- --------------- - GPIOB_5
SPI_CS --------------------------------GPIOB_6
SPI_SCK--------------------- ----------GPIOB_7
SPI_MISO------------------- ---------- GPIOB_8
SPI_MOSI------------------------------GPIOB_9
基于51 +SD_mini/Micro卡模块接线
模块-------- ----------------------STC89C52RC
VCC-------------------------------------5V/3.3（有降压模块接5无降压模块接3.3）
GND-------------------------------------GND
SPI_CS -------------------------------- P1.0
SPI_SCK--------------------- ---------- P1.2
SPI_MISO------------------- ---------- P1.3
SPI_MOSI------------------------------ P1.1
六．代码说明
以下以32代码为例， 串口函数直接移植过来用就行。
1. 模块引脚配置
/**
* @brief SPI_SD引脚初始化
* @param 无
* @retval 无
*/
void SPI_SD_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* 使能SPI引脚相关的时钟 */
SD_SPI_ALL_APBxClock_FUN ( SD_SPI_ALL_CLK, ENABLE );
/* 配置SPI的 CS引脚，普通IO即可 */
GPIO_InitStructure.GPIO_Pin = SD_SPI_CS_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SD_SPI_CS_PORT, &GPIO_InitStructure);
/* 配置SPI的 SCK引脚*/
GPIO_InitStructure.GPIO_Pin = SD_SPI_SCK_PIN;
GPIO_Init(SD_SPI_SCK_PORT, &GPIO_InitStructure);
/* 配置SPI的 MOSI引脚*/
GPIO_InitStructure.GPIO_Pin = SD_SPI_MOSI_PIN;
GPIO_Init(SD_SPI_MOSI_PORT, &GPIO_InitStructure);
/* 配置SPI的 MISO引脚*/
GPIO_InitStructure.GPIO_Pin = SD_SPI_MISO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(SD_SPI_MISO_PORT, &GPIO_InitStructure);
/* 停止信号 FLASH: CS引脚高电平*/
SPI_SD_CS_1;
}
2. SPI读写函数
//********************************************
void SD_2Byte_Write(uint16_t IOData)
{
uint8_t BitCounter;
for (BitCounter=0;BitCounter<16;BitCounter++)
{
SD_SPI_SCK_0;//CLK Low
DelayUs(5);
if(IOData&0x8000)//If the MSB of IOData is 1, then Do=1, else Do=0.
SD_SPI_MOSI_1;//Do High
else
SD_SPI_MOSI_0;//Do Low
SD_SPI_SCK_1;//CLK High
DelayUs(5);
IOData=IOData<<1;//Because the MSB is transmitted firstly, shift to next lower bit.
}
}
//********************************************
void SD_Write(uint16_t IOData)
{
uint8_t BitCounter;
IOData=IOData<<8;
for (BitCounter=0;BitCounter<8;BitCounter++)
{
SD_SPI_SCK_0;//CLK Low
DelayUs(5);
if(IOData&0x8000)//If the MSB of IOData is 1, then Do=1, else Do=0.
SD_SPI_MOSI_1;//Do High
else
SD_SPI_MOSI_0;//Do Low
SD_SPI_SCK_1;//CLK High
DelayUs(5);
IOData=IOData<<1;//Because the MSB is transmitted firstly, shift to next lower bit.
}
}
//********************************************
uint16_t SD_2Byte_Read(void)
{
uint16_t Buffer;
uint8_t BitCounter;
Buffer=0;
for (BitCounter=0;BitCounter<16;BitCounter++)
{
SD_SPI_SCK_0;//CLK Low
DelayUs(5);
SD_SPI_SCK_1;//CLK High
DelayUs(5);
Buffer=Buffer<<1;//Because the MSB is transmitted firstly, shift to next lower bit.
//Because the LSB will be damaged, we can not put this line under next line.
if(READ_SD_SPI_MISO)
Buffer++;//If SPI_Din=1 then the LSB_of_Buffer=1.
}
return Buffer;
}
//********************************************
uint16_t SD_Read(void)
{
uint16_t Buffer;
uint8_t BitCounter;
Buffer=0xffff;
for (BitCounter=0;BitCounter<8;BitCounter++)
{
SD_SPI_SCK_0;//CLK Low
DelayUs(5);
SD_SPI_SCK_1;//CLK High
DelayUs(5);
Buffer=Buffer<<1;//Because the MSB is transmitted firstly, shift to next lower bit.
//Because the LSB will be damaged, we can not put this line under next line.
if(READ_SD_SPI_MISO)
Buffer++;//If SPI_Din=1 then the LSB_of_Buffer=1.
}
return Buffer;
}
3. 功能函数
比较多且有点负载，只展示部分，有需要直接加群私聊群主获取
//********************************************
uint16_t SD_Initiate_Card(void)//Polling the card after reset
{
unsigned int temp,Response,MaximumTimes;
MaximumTimes=50;
for(temp=0;temp<MaximumTimes;temp++)
{
Response=SD_CMD_Write(0x0037,0x00000000,1,0);//Send CMD55
Response=SD_CMD_Write(0x0029,0x00000000,1,0);//Send ACMD41
if (Response==0xff00)
temp=MaximumTimes;
}
return Response;
}
//********************************************
uint16_t SD_Get_CardInfo(void)//Read CSD register
{
unsigned int temp,Response,MaximumTimes;
MaximumTimes=50;
for(temp=0;temp<MaximumTimes;temp++)
{
Response=SD_CMD_Write(9,0x00000000,1,1);//Send CMD9
if (Response==0xff00)
temp=MaximumTimes;
}
for (temp=0;temp<8;temp++)//Provide 8 clock to romove the first byte of data response (0x00fe)
{
SD_SPI_SCK_0;//CLK Low
DelayUs(5);
SD_SPI_SCK_1;//CLK High
DelayUs(5);
}
for (temp=0;temp<8;temp++) ReadBuffer[temp]=SD_2Byte_Read();//Get the CSD data
for (temp=0;temp<16;temp++)//Provide 16 clock to remove the last 2 bytes of data response (CRC)
{
SD_SPI_SCK_0;//CLK Low
DelayUs(5);
SD_SPI_SCK_1;//CLK High
DelayUs(5);
}
SPI_SD_CS_1;//CS_High()
for (temp=0;temp<8;temp++)//Provide 8 extra clock after data response
{
SD_SPI_SCK_0;//CLK Low
DelayUs(5);
SD_SPI_SCK_1;//CLK High
DelayUs(5);
}
BlockNR=((ReadBuffer[3]<<2)&0x0fff)+((ReadBuffer[4]>>14)&0x0003)+1;//Calcuate MULT
BlockNR=BlockNR*(0x0002<<(((ReadBuffer[4]<<1)&0x0007)+((ReadBuffer[5]>>15)&0x0001)+1));//Calcuate Block_Number
return Response;
}
//********************************************
uint16_t SD_Overall_Initiation(void)
{
unsigned int Response,Response_2;
Response=0x0000;
Response_2=0xff00;
SD_SPI_MOSI_1;//[1] Do High
//[1] Do must be High when there is no transmition
do
Response=SD_Reset_Card();//[2] Send CMD0
while (Response!=0xff01);
if (Response!=0xff01) Response_2+=8;
//Response=SD_CMD_Write(8,0x00000000,1,0);//Send CMD8
Response=SD_Initiate_Card();//[3] Send CMD55+ACMD41
if (Response==0xff00)
;
else
{
Response_2+=4;
;
}
do
Response=SD_Get_CardInfo();//[4] Read CSD
while (Response!=0xff00);
if (Response==0xff01) Response_2+=2;
return Response_2;
// 0000|0000||0000|0000 Response_2
// |||_CSD Fail
// ||__CMD55+ACMD41 Fail
// |___CMD0 Fail
}
4. 主函数
/*
* 函数名：main
* 描述 ：主函数
* 输入 ：无
* 输出 ：无
*/
int main(void)
{
uint16_t M_Response=0;
uint16_t Data;
uint8_t i;
DelayInit();
USART_Config();
SPI_SD_Init();
for(i=0;i<128;i++)
{
if (i < 64)
{
WriteBuffer[i]=0x4141;
}
else
{
WriteBuffer[i]=0x4242;
}
}
while(1)
{
M_Response=SD_Overall_Initiation();
M_Response=SD_CMD_Write(16,512,1,0);
Data=SD_Get_CardID();
Write_Single_Block(0x0000);
Read_Single_Block(0x0000);
for(i=0; i<128; i++)
{
Usart_SendByte(DEBUG_USARTx, ReadBuffer[i]>>8); //向串口发送高8位数据
Usart_SendByte(DEBUG_USARTx, ReadBuffer[i] );
}
}
}
七．资料获取
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