C51 IO口模拟SPI实现挂载两个flash读写程序

//--------------------------------------------------------------------------// //标　题: SPI测试程序 C51模拟 // //版　本: V1.00 // //日　期: 2013-07-24 // //描　述: P20 ->CS P21->CLK P22->DO P23-> DI // //声　明: // //--------------------------------------------------------------------------// #include <reg52.h> #include <intrins.h> //_nop_(); #include <Uart.h> #include <SPI.h> #define nop() _nop_() uchar ID_DATA[8]; uchar SEL_CS; //**************端口初始化*************************/ sbit SPI_CS1 = P2^0; //CS sbit SPI_CS2 = P2^4; //CS sbit SPI_CLK = P2^3; //CLK sbit SPI_DO = P2^2; //DO sbit SPI_DI = P2^1; //DI //sbit SPI_WP = P2^4; //WP /**********************************************************/ #define SPI_WriteEnable 0x06 #define SPI_WriteDisable 0x04 #define SPI_ReadStatusReg 0x05 #define SPI_WriteStatusReg 0x01 #define SPI_ReadData 0x03 #define SPI_FastReadData 0x0B #define SPI_FastReadDual 0x3B #define SPI_PageProgram 0x02 #define SPI_BlockErase 0xD8 #define SPI_SectorErase 0x20 #define SPI_ChipErase 0xC7 #define SPI_PowerDown 0xB9 #define SPI_ReleasePowerDown 0xAB #define SPI_DeviceID 0xAB #define SPI_ManufactDeviceID 0x90 #define SPI_JedecDeviceID 0x9F /***********************************************************/ /*****************SPI初始化**********************************/ void SPI_init() { SPI_CLK = 0; // set clock to low initial state for SPI operation mode 0 //SPI_CLK = 1; // set clock to High initial state for SPI operation mode 3 //hold = 1; //SPI_WP = 1; SPI_CS1 = 1; // disable device SPI_CS2 = 1; //SPI_Write_Disable(); } //============================================================ void SEL_Device(uchar cs_data) { switch (cs_data) { case 1: SPI_CS1 = 0; SPI_CS2 = 1; break; case 0: SPI_CS1 = 1; SPI_CS2 = 0; break; default: break; } } /**********************SPI单字节接收**************/ uchar SPI_Get_Byte() { uchar i = 0, in = 0, temp = 0; //SPI_CS = 0; SEL_Device(SEL_CS); for (i = 0; i < 8; i++) { in = (in << 1); // shift 1 place to the left or shift in 0 temp = SPI_DO; // save input SPI_CLK = 1; // toggle clock high if (temp == 1) // check to see if bit is high in |= 0x01; // if high, make bit high SPI_CLK = 0; // toggle clock low } return in; } /**************************SPI发送单字节数据***********/ void SPI_Send_Byte(uchar out) { uchar i = 0; //uchar a = 0; //SPI_CS = 0; SEL_Device(SEL_CS); nop();nop(); SPI_CLK = 0; for (i = 0; i < 8; i ++) { if ((out & 0x80) == 0x80) // check if MSB is high SPI_DI = 1; else SPI_DI = 0; // if not, set to low SPI_DI=out&0x80; SPI_CLK = 1; // toggle clock high out = (out << 1); // shift 1 place for next bit nop();nop();nop();nop(); SPI_CLK = 0; // toggle clock low } } /***************************************************************************************/ uchar SPI_Read_StatusReg() { uchar byte = 0; SEL_Device(SEL_CS); //SPI_CS = 0; // enable device SPI_Send_Byte(SPI_ReadStatusReg); // send Read Status Register command byte = SPI_Get_Byte(); // receive byte SPI_CS1 = 1; // disable device SPI_CS2 = 1; return byte; } /*************************************************************/ void SPI_Wait_Busy() { /*waste time until not busy WEL & Busy bit all be 1 (0x03). */ while (SPI_Read_StatusReg() == 0x03) SPI_Read_StatusReg(); } /***************************************************************************************/ void SPI_Write_Enable() { //SPI_CS = 0; // enable device SEL_Device(SEL_CS); SPI_Send_Byte(SPI_WriteEnable); // send SPI_Write_Enable command SPI_CS1 = 1; // disable device SPI_CS2 = 1; // disable device } /********************SPI禁止写数据************************/ /*void SPI_Write_Disable() { SEL_Device(SEL_CS); //SPI_CS = 0; // enable device SPI_Send_Byte(SPI_WriteDisable); // send SPI_WriteSPI_DIsable command SPI_CS1 = 1; // disable device SPI_CS2 = 1; // disable device }*/ //=================================制造/器件ID================================================ void SPI_Read_ID2(uchar ID_Addr) { //unsigned int IData16; SEL_Device(SEL_CS);//SPI_CS = 0; // enable device SPI_Send_Byte(SPI_ManufactDeviceID); // send read ID command (90h) //SPI_Send_Byte(0x90); SPI_Send_Byte(0x00); // send address SPI_Send_Byte(0x00); // send address SPI_Send_Byte(ID_Addr); // send W25Pxx selectable ID address 00H or 01H //IData16 = SPI_Get_Byte()<<8; // receive Manufature or Device ID byte //IData16 |= SPI_Get_Byte(); // receive Device or Manufacture ID byte ID_DATA[0]=SPI_Get_Byte(); ID_DATA[1]=SPI_Get_Byte(); SPI_CS1 = 1; SPI_CS2 = 1; // disable device SendString(ID_DATA,2); SPI_Wait_Busy(); //return IData16; } //============================= 读o个字节数据==================================================== void SPI_Read_nBytes(uint32 Dst_Addr,uint32 nBytes_128) { uint j; SPI_Wait_Busy(); SEL_Device(SEL_CS); //SPI_CS = 0; // enable device SPI_Send_Byte(SPI_ReadData); // read command SPI_Send_Byte((uchar)((Dst_Addr & 0xFFFFFF) >> 16));// send 3 address bytes SPI_Send_Byte((uchar)((Dst_Addr & 0x00FFFF) >> 8)); SPI_Send_Byte((uchar)(Dst_Addr & 0x0000FF)); for (j = 0 ; j < nBytes_128 ; j++)//32768 { ID_DATA[6] = SPI_Get_Byte(); Uart_Send(ID_DATA[6]); } SPI_CS1 = 1; SPI_CS2 = 1; // disable device SPI_Wait_Busy(); } //================================================================================================= void SPI_Write_nBytes(uint32 Dst_Addr, uint nBytes_128) { uint i; SPI_Wait_Busy(); SEL_Device(SEL_CS);//SPI_CS = 0; // enable device SPI_Write_Enable(); // set WEL SEL_Device(SEL_CS);//SPI_CS = 0; SPI_Wait_Busy(); SEL_Device(SEL_CS);//SPI_CS = 0; SPI_Send_Byte(SPI_PageProgram); // send Byte Program command SPI_Send_Byte((uchar)((Dst_Addr & 0xFFFFFF) >> 16)); /* send 3 address bytes */ SPI_Send_Byte((uchar)((Dst_Addr & 0x00FFFF) >> 8)); SPI_Send_Byte((uchar)Dst_Addr & 0x0000FF); for (i = 0; i<nBytes_128; i++) {