需要关于LCD1602和STM32f103C8T6的连线图

以下是LCD1602和STM32F103C8T6的连线图：


其中，VSS、VDD、VEE分别接地、电源和对比度控制电压，RS、RW、EN分别为指令/数据选择、读写控制、使能控制，D0~D7为数据线，A、K为背光正负极。

具体连线方式如下：

- VSS接GND
- VDD接5V
- VEE通过一个10K电位器接电源负极（GND），调节对比度
- RS接PA1
- RW接GND
- EN接PA0
- D0~D7接PB0~PB7
- A接5V
- K接GND

同时，需要注意的是，在使用STM32F103C8T6驱动LCD1602时，需要使用4位数据线模式，即只使用D4~D7这四根数据线。具体实现方式可以参考以下代码：

#define LCD_DATA_GPIO GPIOB
#define LCD_RS_GPIO GPIOA
#define LCD_EN_GPIO GPIOA

#define LCD_D4_PIN GPIO_Pin_0
#define LCD_D5_PIN GPIO_Pin_1
#define LCD_D6_PIN GPIO_Pin_2
#define LCD_D7_PIN GPIO_Pin_3

#define LCD_RS_PIN GPIO_Pin_1
#define LCD_EN_PIN GPIO_Pin_0

#define LCD_DATA_MASK (LCD_D4_PIN | LCD_D5_PIN | LCD_D6_PIN | LCD_D7_PIN)

void LCD_WriteNibble(uint8_t nibble, uint8_t rs) {
  if (rs) {
    GPIO_SetBits(LCD_RS_GPIO, LCD_RS_PIN);
  } else {
    GPIO_ResetBits(LCD_RS_GPIO, LCD_RS_PIN);
  }

  GPIO_SetBits(LCD_EN_GPIO, LCD_EN_PIN);
  GPIO_Write(LCD_DATA_GPIO, (GPIO_ReadInputData(LCD_DATA_GPIO) & ~LCD_DATA_MASK) | (nibble << 0));
  GPIO_ResetBits(LCD_EN_GPIO, LCD_EN_PIN);
}

void LCD_WriteByte(uint8_t byte, uint8_t rs) {
  LCD_WriteNibble(byte >> 4, rs);
  LCD_WriteNibble(byte & 0x0F, rs);
}

void LCD_Init(void) {
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

  GPIO_InitStructure.GPIO_Pin = LCD_RS_PIN | LCD_EN_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(LCD_RS_GPIO, &GPIO_InitStructure);
  GPIO_Init(LCD_EN_GPIO, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = LCD_D4_PIN | LCD_D5_PIN | LCD_D6_PIN | LCD_D7_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(LCD_DATA_GPIO, &GPIO_InitStructure);

  // 初始化过程
  GPIO_ResetBits(LCD_RS_GPIO, LCD_RS_PIN);
  GPIO_ResetBits(LCD_EN_GPIO, LCD_EN_PIN);
  GPIO_ResetBits(LCD_DATA_GPIO, LCD_DATA_MASK);

  Delay_ms(15);
  LCD_WriteNibble(0x03, 0);
  Delay_ms(5);
  LCD_WriteNibble(0x03, 0);
  Delay_ms(1);
  LCD_WriteNibble(0x03, 0);
  Delay_ms(1);
  LCD_WriteNibble(0x02, 0);

  LCD_WriteByte(0x28, 0);
  LCD_WriteByte(0x0C, 0);
  LCD_WriteByte(0x06, 0);
  LCD_WriteByte(0x01, 0);
}

void LCD_Clear(void) {
  LCD_WriteByte(0x01, 0);
  Delay_ms(2);
}

void LCD_WriteChar(uint8_t ch) {
  LCD_WriteByte(ch, 1);
}

void LCD_WriteString(const char *str) {
  while (*str) {
    LCD_WriteChar(*str++);
  }
}