PIC18, MPLAB X IDE, XC8, I2C, pcf8563

PIC18, MPLAB X IDE, XC8, I2C, pcf8563

4MHz frequency에 100KHz clock 입니다.

RC3, RC4를 i2c 라인으로 사용합니다.

0. 참고 사항

• https://www.teachmemicro.com/pic16-i2c/
• https://www.waveshare.com/wiki/Open18F4520
  
• [  ] https://www.microchip.com/wwwproducts/en/PIC18F4520
• [ datasheet ] http://ww1.microchip.com/downloads/en/devicedoc/39631a.pdf

1. HW 연결

2. 소스 설명

full 소스는 아래 github를 통해 확인하세요.

i2c로 어떤 module의 값을 가져올 때

start - write_mode_addr - get_reg - restart - read_mode_addr - read_value - stop의 순서입니다.

void setI2C(unsigned char reg, unsigned char data) {     I2C_Master_Start();         // Start condition         I2C_Master_Write(RTC_ADDR); // 7 bit address + Write     I2C_Master_Write(reg);      // Write data     I2C_Master_Write(data);     // Write data         I2C_Master_Stop();          // Stop condition } unsigned char getI2C(unsigned char reg) {     unsigned char data;       I2C_Master_Start();                 // Start condition         I2C_Master_Write(RTC_ADDR);         // 7 bit address + Write     I2C_Master_Write(reg);         I2C_Master_RepeatedStart();         // add, important!!!         I2C_Master_Write(RTC_ADDR | 0x01);  // 7 bit address + Read     data = I2C_Master_Read(0);          // Read + Acknowledge     I2C_Master_Stop();                  // Stop condition     return data; }

3. 소스

• https://github.com/sglee0223/pic18/tree/master/i2c_pcf8563.X
  

4. 결과