msp430单片机（江苏省电子设计大赛专用单片机）SD卡储存程序

#include "msp430x14x.h" #include "string.h" #include "FAT16.h" void open_xt2(void) { BCSCTL1 &= ~XT2OFF; char n; do { IFG1 &= ~OFIFG; for(n=0xee;n>0;n--) { ; } } while((IFG1&OFIFG)!=0); BCSCTL2 |= SELM_2 + SELS; } void SPI_init(void) { open_xt2(); UCTL1=SWRST;//开启设置 UTCTL1=CKPH+SSEL1+STC;//选择SMCLK UCTL1|=CHAR+SYNC+MM;//8为数据 SPI模式 UBR01=0x03;//波特率设置 UBR11=0X00; UMCTL1=0X00; UCTL1&=~SWRST;//关闭设置 ME2|=USPIE1;//使能SPI } //SD卡初始化 char SD_init(void) { int i; int time=5; unsigned char response1=0xff,response2=0xff; P5SEL|=0X0e;//0000 1110 P5.0.1.2.3选择第二功能 P5DIR|=0X0B;//0000 1011 SPI_init(); CS_1; do { if(!time) return (failed); time--; for(i=0;i<10;i++) Sendbyte(0xff);//延时80个CLK CS_0; Sendcmd(cmd0,0,0x95); } while(getresponse1()!=0x01); while((response1!=0x01)||(response2!=0x00)) { CS_1; Sendbyte(0xff);//延时8个CLK CS_0; Sendcmd(cmd55,0,0xff); response1=getresponse1(); CS_1; Sendbyte(0xff); CS_0; Sendcmd(acmd41,0,0xff); response2=getresponse0(); } CS_1; Sendbyte(0xff); return (SUCCESS); } //发送命令字 void Sendcmd(unsigned char cmd,unsigned long data,unsigned char CRC)//cmd 命令字 data 命令指令 CRC 校验位 { unsigned char command[6]; int i; command[0]=(cmd|0x40); for(i=1;i<5;i++) command[i]=(char)(data>>8*(4-i)); command[5]=CRC; for(i=0;i<6;i++) Sendbyte(command[i]); } //发送八位字节 同时用于延时八个CLK char Sendbyte(unsigned char byte) { while((IFG2&UTXIFG1)==0);//等待...直到发送中断标志位置位 TXBUF1=byte; while((IFG2&URXIFG1)==0);//等待...直到接受缓存数据满 再取回数据 return (RXBUF1); } //读取SD卡容量信息，此信息存储在CSD寄存器中 通过发送cmd9来读取 //需要数据为80-84/SD_len 62-73/SD_size 47-49/SD_size_mult unsigned long Read_SD_size(void) { unsigned int data,i,j,SD_size; unsigned char SD_len,SD_size_mult; unsigned long SD_card_size; do {CS_1; Sendbyte(0xff); CS_0; Sendcmd(cmd9,0,0xff); } while(getresponse0()!=0x00); do data=response=Sendbyte(0xff); while(data!=0xfe); for(i=0;i<5;i++)//88-127 data=Sendbyte(0xff); data=Sendbyte(0xff);//80-87 SD_len=data&0x0F;//取出80-83 data=Sendbyte(0xff);//72-79 SD_size=(data&0x03)<<10;//取出72-72位 并放到最高位 data=Sendbyte(0xff);//64-71 SD_size+=data<<2; data=Sendbyte(0xff);//56-63 SD_size+=data>>6; data=Sendbyte(0xff);//48-55 SD_size_mult=(data&0x3)<<1;//取出48-49 data=Sendbyte(0xff);//40-47 SD_size_mult+=data>>7; for(i=0;i<5;i++) data=Sendbyte(0xff);//0-39 for(i=0;i<4;i++)//延时 Sendbyte(0xff); data=Sendbyte(0xff); CS_0; //开始计算容量 SD_card_size=SD_size+1; for(i=2,j=SD_size_mult+2;j>1;j--) i<<=1; SD_card_size*=i; for(i=2,j=SD_len;j>1;j--) i<<=1; SD_card_size*=i; return SD_card_size; } //回应0x00 unsigned char getresponse0() { int i=0; while(i<10) { response=Sendbyte(0xff); if(response==0x00)break; i++; } return (response); } //回应0x01 unsigned char getresponse1() { int i=0; while(i<10) { response=Sendbyte(0xff); if(response==0x01)break; i++; } return (response); } //设置数据长度 cmd16 char Set_block_length(unsigned long length) { CS_0; Sendcmd(cmd16,length,0xff); while(getresponse0()!=0x00) { SD_init(); CS_0; Sendcmd(cmd16,length,0xff); } CS_1; Sendbyte(0xff); return (SUCCESS); } //向SD卡写数据（单块） 写入的地址 数据长度 要写入的数据 void Write_data(unsigned long address,unsigned long length ,unsigned char *buffer) { int check; unsigned long i; check=Set_block_length(length); if(check==SUCCESS) { do { Sendbyte(0xff); CS_0; Sendcmd(cmd24,address,0xff); } while(getresponse0()!=0x00); Sendbyte(0xff); Sendbyte(0xff); Sendbyte(0xfe); for(i=0;i<length;i++) Sendbyte(*buffer++); Sendbyte(0xff); Sendbyte(0xff); } } //读取SD卡数据(单块) char Read_data(unsigned long address,unsigned long length,unsigned char *buffer) { int check; unsigned long i; check=Set_block_length(length); if(check==SUCCESS) { do { Sendbyte(0xff); CS_0; Sendcmd(cmd17,address,0xff); } while(getresponse0()!=0x00); while(Sendbyte(0xff)!=0xfe); for(i=0;i<length;i++) buffer[i]=Sendbyte(0xff); } return (*buffer); } //FAT系统初始化 void FAT_init(void) { unsigned char buffer[512]; Read_BPB(buffer); sector_per_cluster=buffer[13]; resvered_sector=(long)((buffer[15]<<8)|buffer[14]); hidden_sector=((long)(buffer[31])<<24)|((long)(buffer[30])<<16)|((long)(buffer[29])<<8)|(long)(buffer[28]); num_sector_FAT16=(long)((buffer[20]<<8)|buffer[19]); num_FAT=buffer[16]; num_sector_FAT=(long)((buffer[23]<<8)|buffer[22]); FAT1_begin_sector=resvered_sector+hidden_sector; FAT2_begin_sector=FAT1_begin_sector+num_sector_FAT; FDT_begin_sector=FAT1_begin_sector+num_sector_FAT*num_FAT; data_begin_sector=FDT_begin_sector+32; } //读取BPB表 char Read_BPB(unsigned char *p) { unsigned long table; Read_data(0,512,p); if((p[0]!=0xeb)&&(p[510]==0x55)&&(p[511]==0xAA)) { table=(long)(p[457])<<24|(long)(p[456])<<16|(long)(p[455])<<8|p[454]; Read_data(table*512,512,p); return (*p); } else return (*p); } //创建文件 void creat_file(unsigned char *file_name) { int j=0; long i; unsigned long cluster; unsigned char file_fdt[512]; unsigned char file_fat[512]; buffer_fdt[92]=(unsigned char)num_byte; buffer_fdt[93]=(unsigned char)(num_byte>>8); buffer_fdt[94]=(unsigned char)(num_byte>>16); buffer_fdt[95]=(unsigned char)(num_byte>>24); for(i=0;i<512;i++) { if((i>=0&&i<64)||(i>=72&&i<96)) file_fdt[i]=buffer_fdt[i]; else if(i>=64&&i<72) { file_fdt[i]=file_name[j]; j++; } else file_fdt[i]=0x00; } Write_data(FDT_begin_sector*512,512,file_fdt); Write_data(FDT_begin_sector*512,512,file_fdt); cluster=num_byte/512/16; if(num_byte%8192) cluster+=1; for(i=0;i<4;i++) file_fat[i]=buffer_fat[i]; if(cluster==0) { for(;i<512;i++) file_fat[i]=0x00; } else if(cluster==1) { file_fat[i++]=0xff; file_fat[i++]=0xff; for(;i<512;i++) file_fat[i]=0x00; } else { for(;cluster>1;cluster--) { file_fat[i]=(unsigned char)((i+2)/2); i++; file_fat[i]=(unsigned char)(((i+1)/2)>>8); i++; } file_fat[i++]=0xff; file_fat[i++]=0xff; for(;i<512;i++) file_fat[i]=0x00; } Write_data(FAT1_begin_sector*512,512,file_fat); Write_data(FAT1_begin_sector*512,512,file_fat); Write_data(FAT2_begin_sector*512,512,file_fat); Write_data(FAT2_begin_sector*512,512,file_fat); } //串口初始化 void uart_init(void) { U0CTL |= SWRST; //开启设置 U0TCTL = SSEL1; //选择 SMCLK=8M 波特率=9600 U0BR0 =0x41; U0BR1 =0x03; U0MCTL =0x92; //00000000 U0CTL |= CHAR; //长度8位 U0CTL &= ~SWRST; }