iic.zip.zip_zip

/********************************************************************************************* * File name: iic.c * Author: Embest * Descript: iic source code. * History: * Y.J.Guo, Programming start, April 4, 2005 *********************************************************************************************/ /*------------------------------------------------------------------------------------------*/ /* include files */ /*------------------------------------------------------------------------------------------*/ #include "2410lib.h" #include "iic_test.h" /*------------------------------------------------------------------------------------------*/ /* global variables */ /*------------------------------------------------------------------------------------------*/ int f_nGetACK; /********************************************************************************************* * name: iic_test * func: test iic * para: none * ret: none * modify: * comment: *********************************************************************************************/ void iic_test(void) { UINT8T szData[256]; //UINT8T szBuf[256]; unsigned int i; uart_printf("\n IIC operate Test Example"); uart_printf("\n IIC Test using AT24C04 "); uart_printf("\n Write char 0-f into AT24C04\n"); f_nGetACK = 0; // Enable interrupt rINTMOD = 0x0; rINTMSK &= ~BIT_IIC; pISR_IIC = (unsigned)iic_int_24c04; // Initialize iic rIICADD = 0x10; // S3C2410X slave address rIICCON = 0xaf; // Enable ACK, interrupt, SET IICCLK=MCLK/16 rIICSTAT = 0x10; // Enable TX/RX // Write 0 - 16 to 24C04 for(i=0; i<16; i++) { iic_write_24c040(0xa0, i, i); delay(10); } // Clear array for(i=0; i<16; i++) szData[i]=0; // Read 16 byte from 24C04 for(i=0; i<16; i++) iic_read_24c040(0xa0, i, &(szData[i])); // Printf read data uart_printf(" Read 16 bytes from AT24C04\n"); for(i=0; i<16; i++) { #ifdef BOARDTEST sprintf(szBuf," %2x ",szData[i]); if(i<8) Lcd_DspAscII6x8(194+10*i,170,0xec,szBuf); else Lcd_DspAscII6x8(194+10*(i-8),180,0xec,szBuf); #endif uart_printf(" %2x ", szData[i]); } rINTMSK |= BIT_IIC; uart_printf("\n end.\n"); } /********************************************************************************************* * name: iic_write_24c040 * func: write data to 24C040 * para: unSlaveAddr --- input, chip slave address * unAddr --- input, data address * ucData --- input, data value * ret: none * modify: * comment: *********************************************************************************************/ void iic_write_24c040(UINT32T unSlaveAddr,UINT32T unAddr,UINT8T ucData) { f_nGetACK = 0; // Send control byte rIICDS = unSlaveAddr; // 0xa0 rIICSTAT = 0xf0; // Master Tx,Start while(f_nGetACK == 0); // Wait ACK f_nGetACK = 0; //Send address rIICDS = unAddr; rIICCON = 0xaf; // Resumes IIC operation. while(f_nGetACK == 0); // Wait ACK f_nGetACK = 0; // Send data rIICDS = ucData; rIICCON = 0xaf; // Resumes IIC operation. while(f_nGetACK == 0); // Wait ACK f_nGetACK = 0; // End send rIICSTAT = 0xd0; // Stop Master Tx condition rIICCON = 0xaf; // Resumes IIC operation. delay(5); // Wait until stop condtion is in effect. } /********************************************************************************************* * name: iic_read_24c040 * func: read data from 24C040 * para: unSlaveAddr --- input, chip slave address * unAddr --- input, data address * pData --- output, data pointer * ret: none * modify: * comment: *********************************************************************************************/ void iic_read_24c040(UINT32T unSlaveAddr,UINT32T unAddr,UINT8T *pData) { char cRecvByte; f_nGetACK = 0; //Send control byte rIICDS = unSlaveAddr; // 0xa0 rIICSTAT = 0xf0; // Master Tx,Start while(f_nGetACK == 0); // Wait ACK f_nGetACK = 0; // Send address rIICDS = unAddr; rIICCON = 0xaf; // Resumes IIC operation. while(f_nGetACK == 0); // Wait ACK f_nGetACK = 0; //Send control byte rIICDS = unSlaveAddr; // 0xa0 rIICSTAT = 0xb0; // Master Rx,Start rIICCON = 0xaf; // Resumes IIC operation. while(f_nGetACK == 0); // Wait ACK f_nGetACK = 0; //Get data // cRecvByte = rIICDS; rIICCON = 0x2f; delay(1); // Get data cRecvByte = rIICDS; // End receive rIICSTAT = 0x90; // Stop Master Rx condition rIICCON = 0xaf; // Resumes IIC operation. delay(5); // Wait until stop condtion is in effect. *pData = cRecvByte; } /********************************************************************************************* * name: iic_int_24c04() * func: IIC interrupt handler * para: none * ret: none * modify: * comment: *********************************************************************************************/ void __irq iic_int_24c04(void) { ClearPending(BIT_IIC); f_nGetACK = 1; }