STM32F103C8T6 – Hiển thị LCD1602 với module mở rộng chân I2C PCF8574

Về giao tiếp vi điều khiển với module I2C LCD mình đã viết ở phần vi điều khiển MS51FB9AE ở link:
http://vidieukhien.org/ms51fb9ae-lcd-16×02-voi-module-i2c.html
. Để hiển thị dùng STM32 thì chỉ cần viết lại thư viện I2C.

May mắn là thư viện đã có sẵn ở đây. Chỉ cần sửa lại nguyên mẫu hàm cho phù hợp là được. Link thư viện:
https://github.com/geoffreymbrown/STM32-Template/tree/master/Library

Sửa lại một chút như sau:

file i2c.h


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#ifndef I2C_H
#define I2C_H
#include <stm32f10x_i2c.h>
typedef enum {Error = 0, Success = !Error } Status;
void My_I2C_Init(void);
uint8_t I2C_Write(uint8_t Address, uint8_t *pData, uint8_t length);
uint8_t I2C_Read(uint8_t Address, uint8_t *pData, uint8_t length);
Status lib_I2C_Read(I2C_TypeDef* I2Cx, uint8_t* buf, uint32_t nbuf, uint8_t SlaveAddress);
Status lib_I2C_Write(I2C_TypeDef* I2Cx, const uint8_t* buf, uint32_t nbuf,  uint8_t SlaveAddress);
void lib_I2C_LowLevel_Init(I2C_TypeDef* I2Cx, int ClockSpeed, int OwnAddress);
#endif
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file i2c.c


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...
#include "I2C.h"
void My_I2C_Init(void)
{
    lib_I2C_LowLevel_Init(I2C1, 100000, 0x00);
}
uint8_t I2C_Write(uint8_t Address, uint8_t *pData, uint8_t length)
{
    return lib_I2C_Write(I2C1, pData, length, Address);
}
uint8_t I2C_Read(uint8_t Address, uint8_t *pData, uint8_t length)
{
    return lib_I2C_Read(I2C1, pData, length, Address);
}
#define Timed(x) Timeout = 0xFFFF; while (x) { if (Timeout-- == 0) goto errReturn;}
...
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Sử dụng thư viện.

file main.c


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#include "stm32f10x.h"
#include "delay.h"
#include "i2c_lcd.h"
void init(void);
int main() {
    uint8_t test = 0;
    
    init();
    Delay_Init();
    
    I2C_LCD_Init();
    I2C_LCD_Clear();
    I2C_LCD_BackLight(1);
    
    while(1) {
        if (test) {
            test = 0;
            I2C_LCD_Clear();
            I2C_LCD_Puts("STM32F103C8T6");
            I2C_LCD_NewLine();
            I2C_LCD_Puts("LCD I2C Test");
            GPIO_ResetBits(GPIOC, GPIO_Pin_13);
        } else {
            test = 1;
            I2C_LCD_Clear();
            I2C_LCD_Puts("Ngo Hung Cuong");
            I2C_LCD_NewLine();
            I2C_LCD_Puts("LCD I2C Library");
            GPIO_SetBits(GPIOC, GPIO_Pin_13);
        }
        Delay_Ms(2000);
    }
}
void init(void) {
    GPIO_InitTypeDef gpioInit;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
    gpioInit.GPIO_Mode=GPIO_Mode_Out_PP;
    gpioInit.GPIO_Speed=GPIO_Speed_50MHz;
    gpioInit.GPIO_Pin=GPIO_Pin_13;
    GPIO_Init(GPIOC, &gpioInit);
}
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