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1 Anonymous Users
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C中程序嵌套有限制嗎
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資深會員
 
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uint8 SD_write_sector(uint32 addr,uint8 *buffer){
uint16 i,tmp,timeout; uint8 respone; uint8 cmd[]={0x58,0x00,0x00,0x00,0x00,0xff}; addr = addr*512; //a sector contain 512 bytes cmd[1] = (uint8)((addr & 0xff000000)>>24); cmd[2] = (uint8)((addr & 0x00ff0000)>>16); cmd[3] = (uint8)((addr & 0x0000ff00)>>8); cmd[4] = (uint8)(addr & 0x000000ff); watres: SD_Disable(); PORTEbits.RE3=1; //generate 8 pulse SD_wr_byte(0xff); //select SD SD_Enable(); PORTEbits.RE3=0; //write cmd17 SD_wr_byte(cmd[0]); SD_wr_byte(cmd[1]); SD_wr_byte(cmd[2]); SD_wr_byte(cmd[3]); SD_wr_byte(cmd[4]); SD_wr_byte(cmd[5]); //WAITE R1=00,100times timeout=0; do { respone=SD_wr_byte(0xff); timeout++; } while((respone!=0x00)&&(timeout<10)); 為何有時會出現只發前五個SPI時鐘，隔45個時鐘后才再有時鐘，會丟數據？
發表於: 2009/1/8 23:31
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