帮我编写一个基于STM32F1的断码式LCD屏驱动示例,COM脚有3个,SEG引脚有8个,并使用stm32标准库
时间: 2023-12-30 22:04:58 浏览: 206
stm 32 -lcd 驱动实例
好的,以下是基于STM32F1的断码式LCD屏驱动示例:
首先需要定义COM和SEG引脚的GPIO端口和引脚号:
```c
#define LCD_COM_GPIO_PORT GPIOB
#define LCD_COM_PIN_0 GPIO_Pin_10
#define LCD_COM_PIN_1 GPIO_Pin_11
#define LCD_COM_PIN_2 GPIO_Pin_12
#define LCD_SEG_GPIO_PORT GPIOA
#define LCD_SEG_PIN_0 GPIO_Pin_0
#define LCD_SEG_PIN_1 GPIO_Pin_1
#define LCD_SEG_PIN_2 GPIO_Pin_2
#define LCD_SEG_PIN_3 GPIO_Pin_3
#define LCD_SEG_PIN_4 GPIO_Pin_4
#define LCD_SEG_PIN_5 GPIO_Pin_5
#define LCD_SEG_PIN_6 GPIO_Pin_6
#define LCD_SEG_PIN_7 GPIO_Pin_7
```
然后需要定义COM和SEG引脚的掩码:
```c
#define LCD_COM_MASK (LCD_COM_PIN_0 | LCD_COM_PIN_1 | LCD_COM_PIN_2)
#define LCD_SEG_MASK (LCD_SEG_PIN_0 | LCD_SEG_PIN_1 | LCD_SEG_PIN_2 | LCD_SEG_PIN_3 | \
LCD_SEG_PIN_4 | LCD_SEG_PIN_5 | LCD_SEG_PIN_6 | LCD_SEG_PIN_7)
```
接下来需要定义每个数字所对应的SEG引脚状态:
```c
#define LCD_CHAR_0 (LCD_SEG_PIN_0 | LCD_SEG_PIN_1 | LCD_SEG_PIN_2 | LCD_SEG_PIN_3 | \
LCD_SEG_PIN_4 | LCD_SEG_PIN_5)
#define LCD_CHAR_1 (LCD_SEG_PIN_1 | LCD_SEG_PIN_2)
#define LCD_CHAR_2 (LCD_SEG_PIN_0 | LCD_SEG_PIN_1 | LCD_SEG_PIN_3 | LCD_SEG_PIN_4 | \
LCD_SEG_PIN_6)
#define LCD_CHAR_3 (LCD_SEG_PIN_0 | LCD_SEG_PIN_1 | LCD_SEG_PIN_2 | LCD_SEG_PIN_3 | \
LCD_SEG_PIN_6)
#define LCD_CHAR_4 (LCD_SEG_PIN_1 | LCD_SEG_PIN_2 | LCD_SEG_PIN_5 | LCD_SEG_PIN_6)
#define LCD_CHAR_5 (LCD_SEG_PIN_0 | LCD_SEG_PIN_2 | LCD_SEG_PIN_3 | LCD_SEG_PIN_5 | \
LCD_SEG_PIN_6)
#define LCD_CHAR_6 (LCD_SEG_PIN_0 | LCD_SEG_PIN_2 | LCD_SEG_PIN_3 | LCD_SEG_PIN_4 | \
LCD_SEG_PIN_5 | LCD_SEG_PIN_6)
#define LCD_CHAR_7 (LCD_SEG_PIN_0 | LCD_SEG_PIN_1 | LCD_SEG_PIN_2)
#define LCD_CHAR_8 (LCD_SEG_PIN_0 | LCD_SEG_PIN_1 | LCD_SEG_PIN_2 | LCD_SEG_PIN_3 | \
LCD_SEG_PIN_4 | LCD_SEG_PIN_5 | LCD_SEG_PIN_6)
#define LCD_CHAR_9 (LCD_SEG_PIN_0 | LCD_SEG_PIN_1 | LCD_SEG_PIN_2 | LCD_SEG_PIN_3 | \
LCD_SEG_PIN_5 | LCD_SEG_PIN_6)
```
然后需要定义每个COM引脚对应的GPIO端口和引脚号:
```c
#define LCD_COM_PIN_0_PORT GPIOB
#define LCD_COM_PIN_0_NUM 10
#define LCD_COM_PIN_1_PORT GPIOB
#define LCD_COM_PIN_1_NUM 11
#define LCD_COM_PIN_2_PORT GPIOB
#define LCD_COM_PIN_2_NUM 12
```
接下来需要定义LCD屏的刷新函数,用于将数字显示在屏幕上:
```c
void LCD_Refresh(uint8_t *digits) {
// 将COM引脚依次拉低,使对应的数字显示在屏幕上
for (int i = 0; i < 3; i++) {
switch (i) {
case 0:
LCD_COM_PIN_0_PORT->BRR = (1 << LCD_COM_PIN_0_NUM);
break;
case 1:
LCD_COM_PIN_1_PORT->BRR = (1 << LCD_COM_PIN_1_NUM);
break;
case 2:
LCD_COM_PIN_2_PORT->BRR = (1 << LCD_COM_PIN_2_NUM);
break;
}
// 根据数字的SEG引脚状态,将对应的SEG引脚拉高或拉低
GPIO_Write(LCD_SEG_GPIO_PORT, (GPIO_ReadOutputData(LCD_SEG_GPIO_PORT) & ~LCD_SEG_MASK) |
((digits[i] & 0x01) ? LCD_SEG_PIN_0 : 0) |
((digits[i] & 0x02) ? LCD_SEG_PIN_1 : 0) |
((digits[i] & 0x04) ? LCD_SEG_PIN_2 : 0) |
((digits[i] & 0x08) ? LCD_SEG_PIN_3 : 0) |
((digits[i] & 0x10) ? LCD_SEG_PIN_4 : 0) |
((digits[i] & 0x20) ? LCD_SEG_PIN_5 : 0) |
((digits[i] & 0x40) ? LCD_SEG_PIN_6 : 0) |
((digits[i] & 0x80) ? LCD_SEG_PIN_7 : 0));
// 将COM引脚拉高,准备刷新下一个数字
switch (i) {
case 0:
LCD_COM_PIN_0_PORT->BSRR = (1 << LCD_COM_PIN_0_NUM);
break;
case 1:
LCD_COM_PIN_1_PORT->BSRR = (1 << LCD_COM_PIN_1_NUM);
break;
case 2:
LCD_COM_PIN_2_PORT->BSRR = (1 << LCD_COM_PIN_2_NUM);
break;
}
}
}
```
最后,在main函数中调用LCD_Refresh函数,传入要显示的数字的SEG引脚状态即可:
```c
int main(void) {
// 初始化GPIO端口和引脚
GPIO_Init(LCD_COM_GPIO_PORT, LCD_COM_PIN_0 | LCD_COM_PIN_1 | LCD_COM_PIN_2, GPIO_Mode_Out_PP);
GPIO_Init(LCD_SEG_GPIO_PORT, LCD_SEG_PIN_0 | LCD_SEG_PIN_1 | LCD_SEG_PIN_2 | LCD_SEG_PIN_3 |
LCD_SEG_PIN_4 | LCD_SEG_PIN_5 | LCD_SEG_PIN_6 | LCD_SEG_PIN_7,
GPIO_Mode_Out_PP);
// 循环显示数字0~9
uint8_t digits[3] = {LCD_CHAR_0, LCD_CHAR_0, LCD_CHAR_0};
while (1) {
for (int i = 0; i < 10; i++) {
digits[2] = (i == 0) ? LCD_CHAR_0 : (1 << (i - 1));
LCD_Refresh(digits);
DelayMs(1000);
}
}
}
```
需要注意的是,以上示例代码中的DelayMs函数需要自行实现,用于延时一定时间,以便观察数字在LCD屏上的显示效果。
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