stm32f103c8t6与lcd1602连接的keil 程序

以下是 STM32F103C8T6 与 LCD1602 连接的 Keil 程序示例：

#include "stm32f10x.h"

#define LCD_RS GPIO_Pin_0
#define LCD_RW GPIO_Pin_1
#define LCD_EN GPIO_Pin_2
#define LCD_D4 GPIO_Pin_4
#define LCD_D5 GPIO_Pin_5
#define LCD_D6 GPIO_Pin_6
#define LCD_D7 GPIO_Pin_7

void delay_ms(uint32_t ms) {
    uint32_t i, j;
    for (i = 0; i < ms; i++) {
        for (j = 0; j < 2000; j++);
    }
}

void LCD_Write4Bits(uint8_t data) {
    GPIO_WriteBit(GPIOB, LCD_D4, (data & 0x01) ? Bit_SET : Bit_RESET);
    GPIO_WriteBit(GPIOB, LCD_D5, (data & 0x02) ? Bit_SET : Bit_RESET);
    GPIO_WriteBit(GPIOB, LCD_D6, (data & 0x04) ? Bit_SET : Bit_RESET);
    GPIO_WriteBit(GPIOB, LCD_D7, (data & 0x08) ? Bit_SET : Bit_RESET);
}

void LCD_SendCommand(uint8_t cmd) {
    GPIO_ResetBits(GPIOB, LCD_RS);
    GPIO_ResetBits(GPIOB, LCD_RW);
    LCD_Write4Bits(cmd >> 4);
    GPIO_SetBits(GPIOB, LCD_EN);
    GPIO_ResetBits(GPIOB, LCD_EN);
    LCD_Write4Bits(cmd);
    GPIO_SetBits(GPIOB, LCD_EN);
    GPIO_ResetBits(GPIOB, LCD_EN);
    delay_ms(2);
}

void LCD_SendData(uint8_t data) {
    GPIO_SetBits(GPIOB, LCD_RS);
    GPIO_ResetBits(GPIOB, LCD_RW);
    LCD_Write4Bits(data >> 4);
    GPIO_SetBits(GPIOB, LCD_EN);
    GPIO_ResetBits(GPIOB, LCD_EN);
    LCD_Write4Bits(data);
    GPIO_SetBits(GPIOB, LCD_EN);
    GPIO_ResetBits(GPIOB, LCD_EN);
    delay_ms(2);
}

void LCD_Init(void) {
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = LCD_RS | LCD_RW | LCD_EN | LCD_D4 | LCD_D5 | LCD_D6 | LCD_D7;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    delay_ms(50);
    LCD_SendCommand(0x03);
    delay_ms(5);
    LCD_SendCommand(0x03);
    delay_ms(5);
    LCD_SendCommand(0x03);
    delay_ms(5);
    LCD_SendCommand(0x02);
    delay_ms(5);
    LCD_SendCommand(0x28);
    LCD_SendCommand(0x08);
    LCD_SendCommand(0x01);
    LCD_SendCommand(0x06);
    LCD_SendCommand(0x0C);
}

int main(void) {
    LCD_Init();
    while (1) {
        LCD_SendCommand(0x80);
        LCD_SendData('H');
        LCD_SendData('e');
        LCD_SendData('l');
        LCD_SendData('l');
        LCD_SendData('o');
        LCD_SendData(',');
        LCD_SendCommand(0xC0);
        LCD_SendData('W');
        LCD_SendData('o');
        LCD_SendData('r');
        LCD_SendData('l');
        LCD_SendData('d');
        delay_ms(1000);
    }
}

这里使用的是 GPIOB 端口，连接方式如下：

LCD1602 | STM32F103C8T6
--------|--------------
RS | PB0
RW | PB1
EN | PB2
D4 | PB4
D5 | PB5
D6 | PB6
D7 | PB7

注意：这只是一个示例程序，实际上还需要根据具体的硬件连接和需求进行修改。