此篇使用MCU I2C功能來完成, 程式部分是以Microchip MCU例子,但觀念可以用在其他廠牌MCU,只要改變週遭IO配置就可以,
1. I2C程式
.h部份
#define SCL1_RB8() TRISBbits.TRISB8 = 1;
#define SDA1_RB9() TRISBbits.TRISB9 = 1;
#define I2C1_InterruptEnable() IEC1bits.MI2C1IE = true;
#define I2C1_InterruptDisable() IEC1bits.MI2C1IE = false;
#define I2C1_InterruptFlagClear() IFS1bits.MI2C1IF = false;
#define I2C1_InterruptPriority IPC4bits.MI2C1IP
/* I2C1 Master初始化 */
void I2C1_Master_Init(void);
/* I2C1 Master Set Clear */
void I2C1_Master_SetClear(void);
/* I2C1 Start */
void I2C1_Start(uint8_t address);
/* I2C1 Stop */
void I2C1_Stop(void);
/* I2C1 Write */
void I2C1_Write(uint8_t data);
/* I2C1 Read Ack */
uint8_t I2C1_Read_Ack(void);
/* I2C1 Read Nack */
uint8_t I2C1_Read_Nack(void);
.c部份
/*
Name: I2C1 Master初始化
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
void I2C1_Master_Init(void){
I2C1_Master_SetClear();
SCL1_RB8();
SDA1_RB9();
/* I2CxCON Set */
I2C1CONbits.SMEN = 0;
I2C1CONbits.DISSLW = 0;
I2C1CONbits.A10M = 0;
I2C1CONbits.IPMIEN = 0;
I2C1CONbits.I2CSIDL = 0;
I2C1CONbits.I2CEN = 1;
/* Baud Rate Set */
I2C1_BRG = 395;
}
/*
Name: I2C1 Master Set Clear
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
void I2C1_Master_SetClear(void){
I2C1CON = 0x0000;
I2C1STAT = 0x0000;
}
/*
Name: I2C1 Start
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
void I2C1_Start(uint8_t address){
I2C1CONbits.SEN = true;
while(I2C1CONbits.SEN==true);
I2C1TRN = address;
while(I2C1STATbits.TBF==true || I2C1STATbits.TRSTAT==true);
while(I2C1STATbits.ACKSTAT==true);
}
/*
Name: I2C1 Stop
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
void I2C1_Stop(void){
I2C1CONbits.PEN = true;
while(I2C1CONbits.PEN==true);
}
/*
Name: I2C1 Write
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
void I2C1_Write(uint8_t data){
I2C1TRN = data;
while(I2C1STATbits.TBF==true || I2C1STATbits.TRSTAT==true);
while(I2C1STATbits.ACKSTAT==true);
}
/*
Name: I2C1 Read Ack
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
uint8_t I2C1_Read_Ack(void){
uint8_t data=NULL;
I2C1CONbits.RCEN = true;
while(I2C1CONbits.RCEN==true);
data = I2C1RCV;
I2C1CONbits.ACKDT = false;
I2C1CONbits.ACKEN = true;
while(I2C1CONbits.ACKEN==true);
return data;
}
/*
Name: I2C1 Read Nack
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
uint8_t I2C1_Read_Nack(void){
uint8_t data=NULL;
I2C1CONbits.RCEN = true;
while(I2C1CONbits.RCEN==true);
data = I2C1RCV;
I2C1CONbits.ACKDT = true;
I2C1CONbits.ACKEN = true;
while(I2C1CONbits.ACKEN==true);
I2C1CONbits.ACKDT = false;
return data;
}
2. FM24CL16B程式
.h部份
#define FM24CL16B_SLAVE_ADDRESS 0xA0
#define FM24CL16B_Length 20
/*
Name: FM24CL16B Global Variable
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
typedef struct{
uint8_t address;
uint8_t writeData[FM24CL16B_Length];
uint8_t readData[FM24CL16B_Length];
uint16_t length;
} _FM24CL16B_Type;
/* 結構變數FM24CL16B */
extern _FM24CL16B_Type FM24CL16B;
/* FM24CL16B初始化 */
void FM24CL16B_Init(void);
/* FM24CL16B資料寫入 */
void FM24CL16B_WriteData(uint8_t addressServe, uint8_t address, uint8_t *writeData, uint16_t length);
/* FM24CL16B資料讀取 */
void FM24CL16B_ReadData(uint8_t addressServe, uint8_t address, uint8_t *readData, uint16_t length);
.c部份
/* 結構變數FM24CL16B */
_FM24CL16B_Type FM24CL16B;
/*
Name: FM24CL16B初始化
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
void FM24CL16B_Init(void){
I2C1_Master_Init();
}
/*
Name: FM24CL16B資料寫入
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
void FM24CL16B_WriteData(uint8_t addressServe, uint8_t address, uint8_t *writeData, uint16_t length){
uint16_t i=0;
I2C1_Start(addressServe);
I2C1_Write(address);
/* I2C1 Write Data */
for(i=0; i<length; i++){
I2C1_Write(*(writeData + i));
}
I2C1_Stop();
}
/*
Name: FM24CL16B資料讀取
Version: V1.0
Author: Michael Cheng
Created Date:
Updated Data: N/A
Description:
Updated Record:
*/
void FM24CL16B_ReadData(uint8_t addressServe, uint8_t address, uint8_t *readData, uint16_t length){
uint16_t i=0;
I2C1_Start(addressServe);
I2C1_Write(address);
I2C1_Stop();
I2C1_Start(addressServe+0x01);
for(i=0; i<(length-1); i++){
*(readData + i) = I2C1_Read_Ack();
}
*(readData + length-1) = I2C1_Read_Nack();
}
3. main部份
FM24CL16B_WriteData(FM24CL16B_SLAVE_ADDRESS, 0x00, (uint8_t*)"123456", 6);
delay_ms(100);
FM24CL16B_ReadData(FM24CL16B_SLAVE_ADDRESS, 0x00, FM24CL16B.readData, 6);
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