/*---------------------------------------------------------------------------------------------------------*//**//* Copyright(c) 2017 Nuvoton Technology Corp. All rights reserved. *//**//*---------------------------------------------------------------------------------------------------------*///***********************************************************************************************************// Nuvoton Technoledge Corp. // Website: http://www.nuvoton.com// E-Mail : MicroC-8bit@nuvoton.com// Date : Jun/21/2017//***********************************************************************************************************//***********************************************************************************************************// File Function: N76E003 I2C demo code, Slave Address of 24LC64 = 0xA0//// ____________ ______________ // | | SDA | |// | |<-------->| |// | | | |// |N76E003(M) | | 24LC64(S) |// | | SCL | |// | |--------->| |// |____________| |_____________|//// Microchip I2C EEPROM 24xx64 (64K Bit) is used as the slave device. // The page size are 32Byte. Total are 256 page.// If verification passes, Port3 will show 0x78. If there is any failure// occured during the progress, Port3 will show 0x00.//***********************************************************************************************************#include "N76E003.h"#include "SFR_Macro.h"#include "Function_define.h"#include "Common.h"#include "Delay.h"#define SYS_CLK_EN 0#define SYS_SEL 2#define SYS_DIV_EN 0 //0: Fsys=Fosc, 1: Fsys = Fosc/(2*CKDIV)#define SYS_DIV 1#define I2C_CLOCK 2#define EEPROM_SLA 0xA0#define EEPROM_WR 0#define EEPROM_RD 1#define LED P3#define PAGE_SIZE 32#define PAGE_NUMBER 4#define ERROR_CODE 0x78#define TEST_OK 0x00bit I2C_Reset_Flag;//========================================================================================================void Init_I2C(void){ P13_OpenDrain_Mode; // Modify SCL pin to Open drain mode. don't forget the pull high resister in circuit P14_OpenDrain_Mode; // Modify SDA pin to Open drain mode. don't forget the pull high resister in circuit/* Set I2C clock rate */ I2CLK = I2C_CLOCK; /* Enable I2C */ set_I2CEN; }//========================================================================================================void I2C_SI_Check(void){ if (I2STAT == 0x00) { I2C_Reset_Flag = 1; set_STO; SI = 0; if(SI) { clr_I2CEN; set_I2CEN; clr_SI; clr_I2CEN; } } }void One_Page_Read(UINT8 u8PageNumber,UINT8 u8DAT){ UINT8 u8Count; UINT16 u16Address; u16Address = (UINT16)u8PageNumber*32; /* Step1 */ set_STA; /* Send Start bit to I2C EEPROM */ clr_SI; while (!SI); if (I2STAT != 0x08) /* 0x08: A START condition has been transmitted*/ { I2C_Reset_Flag = 1; printf("\nI2C 'Send STA' error"); goto Read_Error_Stop; } /* Step2 */ I2DAT = (EEPROM_SLA | EEPROM_WR); /* Send (SLA+W) to EEPROM */ clr_STA; /* Clear STA and Keep SI value in I2CON */ clr_SI; while (!SI); if (I2STAT != 0x18) /* 0x18: SLA+W has been transmitted; ACK has been received */ { I2C_Reset_Flag = 1; printf("\nI2C 'Send SLA+W' error"); goto Read_Error_Stop; } /* Step3 */ I2DAT = HIBYTE(u16Address); /* Send I2C EEPROM's High Byte Address */ clr_SI; while (!SI); if (I2STAT != 0x28) /* 0x28: Data byte in S1DAT has been transmitted; ACK has been received */ { I2C_Reset_Flag = 1; printf("\nI2C 'Send I2C High Byte Address' error"); goto Read_Error_Stop; } /* Step4 */ I2DAT = LOBYTE(u16Address); /* Send I2C EEPROM's Low Byte Address */ clr_SI; while (!SI); if (I2STAT != 0x28) /* 0x28: Data byte in S1DAT has been transmitted; ACK has been received */ { I2C_Reset_Flag = 1; printf("\nI2C 'Send I2C Low Byte Address' error"); goto Read_Error_Stop; } /* Step5 */ set_STA; /* Repeated START */ clr_SI; while (!SI); if (I2STAT != 0x10) /* 0x10: A repeated START condition has been transmitted */ { I2C_Reset_Flag = 1; printf("\nI2C 'Send STA' error"); goto Read_Error_Stop; } /* Step6 */ clr_STA; /* Clear STA and Keep SI value in I2CON */ I2DAT = (EEPROM_SLA | EEPROM_RD); /* Send (SLA+R) to EEPROM */ clr_SI; while (!SI); if (I2STAT != 0x40) /* 0x40: SLA+R has been transmitted; ACK has been received */ { I2C_Reset_Flag = 1; printf("\nI2C 'Send SLA+R' error"); goto Read_Error_Stop; } /* Step7 *//* Verify I2C EEPROM data */for (u8Count = 0; u8Count <PAGE_SIZE; u8Count++) { set_AA; /* Set Assert Acknowledge Control Bit */ clr_SI; while (!SI); if (I2STAT != 0x50) /* 0x50:Data byte has been received; NOT ACK has been returned */ { I2C_Reset_Flag = 1; printf("\nI2C 'No Ack' error"); goto Read_Error_Stop; } if (I2DAT != u8DAT) /* Send the Data to EEPROM */ { I2C_Reset_Flag = 1; printf("\nI2C 'Read data' error"); goto Read_Error_Stop; } u8DAT = ~u8DAT; } /* Step8 */ clr_AA; /* Send a NACK to disconnect 24xx64 */ clr_SI; while (!SI); if (I2STAT != 0x58) /* 0x58:Data byte has been received; ACK has been returned */ { I2C_Reset_Flag = 1; printf("\nI2C 'Ack' error"); goto Read_Error_Stop; } /* Step9 */ clr_SI; set_STO; while (STO) /* Check STOP signal */ { I2C_SI_Check(); if (I2C_Reset_Flag) goto Read_Error_Stop; } Read_Error_Stop: if (I2C_Reset_Flag) { I2C_SI_Check(); printf("\nI2C Read error, test stop"); I2C_Reset_Flag = 0; }}//========================================================================================================void One_Page_Write(UINT8 u8PageNumber,UINT8 u8DAT){ UINT8 u8Count; UINT16 u16Address; u16Address = (UINT16)u8PageNumber*32; /* Step1 */ set_STA; /* Send Start bit to I2C EEPROM */ clr_SI; while (!SI); if (I2STAT != 0x08) /* 0x08: A START condition has been transmitted*/ { I2C_Reset_Flag = 1; printf("\nI2C 'Send STA' error"); goto Write_Error_Stop; } /* Step2 */ clr_STA; /* Clear STA and Keep SI value in I2CON */ I2DAT = EEPROM_SLA | EEPROM_WR; /* Send (SLA+W) to EEPROM */ clr_SI; while (!SI); if (I2STAT != 0x18) /* 0x18: SLA+W has been transmitted; ACK has been received */ { I2C_Reset_Flag = 1; printf("\nI2C 'Send SLA+W' error"); goto Write_Error_Stop; } /* Step3 */ I2DAT = HIBYTE(u16Address); /* Send EEPROM's High Byte Address */ clr_SI; while (!SI); if (I2STAT != 0x28) /* 0x28: Data byte in S1DAT has been transmitted; ACK has been received */ { I2C_Reset_Flag = 1; printf("\nI2C 'Send High byte address' error"); goto Write_Error_Stop; } /* Step4 */ I2DAT = LOBYTE(u16Address); /* Send EEPROM's Low Byte Address */ clr_SI; while (!SI); if (I2STAT != 0x28) /* 0x28: Data byte in S1DAT has been transmitted; ACK has been received */ { I2C_Reset_Flag = 1; printf("\nI2C 'Send Low byte address' error"); goto Write_Error_Stop; } /* Step5 *//* Write data to I2C EEPROM */for (u8Count = 0; u8Count < PAGE_SIZE; u8Count++) { I2DAT = u8DAT; /* Send data to EEPROM */ clr_SI; while (!SI); if (I2STAT != 0x28) /* 0x28: Data byte in S1DAT has been transmitted; ACK has been received */ { I2C_Reset_Flag = 1; printf("\nI2C 'Write Data' error"); goto Write_Error_Stop; } u8DAT = ~u8DAT; } //After STOP condition, a inner EEPROM timed-write-cycle //will occure and EEPROM will not response to outside command/* 0x18: SLA+W has been transmitted; ACK has been received *//* Step6 */do { set_STO; /* Set I2C STOP Control Bit */ clr_SI; while (STO) /* Check STOP signal */ { I2C_SI_Check(); if (I2C_Reset_Flag) goto Write_Error_Stop; } set_STA; /* Check if no ACK is returned by EEPROM, it is under timed-write cycle */ clr_SI; while (!SI); if (I2STAT != 0x08) /* 0x08: A START condition has been transmitted*/ { I2C_Reset_Flag = 1; printf("\nI2C 'Wait Ready' error"); goto Write_Error_Stop; } clr_STA; /* Clear STA and Keep SI value in I2CON */ I2DAT = (EEPROM_SLA | EEPROM_WR); /* Send (SLA+W) to EEPROM */ clr_SI; while (!SI); }while(I2STAT != 0x18); /* Step7 */ set_STO; /* Set STOP Bit to I2C EEPROM */ clr_SI; while (STO) /* Check STOP signal */ { I2C_SI_Check(); if (I2C_Reset_Flag) goto Write_Error_Stop; } Write_Error_Stop: if (I2C_Reset_Flag) { I2C_SI_Check(); I2C_Reset_Flag = 0; printf("\nI2C Write error, test stop"); } }//========================================================================================================void main(void){ Set_All_GPIO_Quasi_Mode; InitialUART0_Timer3(115200); /* Initial I2C function */ Init_I2C(); //initial I2C circuit/* page0 R/W */ printf ("\n\n24LC64 Page0 Write (0x55,0xAA...)..."); One_Page_Write(0,0x55); //page0, write 0x55,0xAA,........ printf ("\n\n24LC64 Page0 Read..."); One_Page_Read (0,0x55); //page0, read 0x55,0xAA,......../* page1 R/W */ printf ("\n\n24LC64 Page1 Write (0x00,0xFF...)..."); One_Page_Write(1,0x00); //page1, write 0x00,0xFF,........ printf ("\n\n24LC64 Page1 Read..."); One_Page_Read (1,0x00); //page1, read 0x00,0xFF,......../* page2 R/W */ printf ("\n\n24LC64 Page2 Write (0xAA,0x55...)..."); One_Page_Write(2,0xAA); //page2, write 0xAA,0x55,........ printf ("\n\n24LC64 Page2 Read..."); One_Page_Read (2,0xAA); //page2, read 0xAA,0x55,......../* page3 R/W */ printf ("\n\n24LC64 Page3 Write (0xFF,0x00...)..."); One_Page_Write(3,0xFF); //page3, write 0xFF,0x00,........ printf ("\n\n24LC64 Page3 Read..."); One_Page_Read (3,0xFF); //page3, read 0xFF,0x00,......../* page255 R/W */ printf ("\n\n24LC64 Page255 Write (0x0F,0xF0...)..."); One_Page_Write(255,0x0F); //page255, write 0x0F,0xF0,........ printf ("\n\n24LC64 Page255 Read..."); One_Page_Read (255,0x0F); //page255, read 0x0F,0xF0,......../* ==== Test Pass ==== */ printf ("\n\N76E003 <--> 24LC64, I2C Demo Code test pass..."); while (1);/* =================== */}