stm32f103c8t6下lcd12864串行通用程序

下面是一个基于STM32F103C8T6和LCD12864的串行通用程序示例，供参考：

#include "stm32f10x.h"

#define LCD_DIN_GPIO GPIOA
#define LCD_DIN_PIN GPIO_Pin_7

#define LCD_CLK_GPIO GPIOA
#define LCD_CLK_PIN GPIO_Pin_5

#define LCD_CS_GPIO GPIOA
#define LCD_CS_PIN GPIO_Pin_4

#define LCD_RST_GPIO GPIOA
#define LCD_RST_PIN GPIO_Pin_3

#define DELAY_TIME 5

void delay_us(uint32_t nus);

void lcd_write_byte(uint8_t data);

void lcd_write_command(uint8_t cmd);

void lcd_write_data(uint8_t data);

void lcd_initialize();

void lcd_clear();

void lcd_display_string(uint8_t x, uint8_t y, char* str);

int main()
{
    SystemInit();
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;

    GPIO_InitStructure.GPIO_Pin = LCD_DIN_PIN | LCD_CLK_PIN | LCD_CS_PIN | LCD_RST_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    lcd_initialize();

    while(1)
    {
        lcd_clear();
        lcd_display_string(0, 0, "Hello World!");
        delay_us(1000000);
    }
}

void delay_us(uint32_t nus)
{
    uint32_t ticks;
    ticks = nus * (SystemCoreClock / 1000000);
    while(ticks--);
}

void lcd_write_byte(uint8_t data)
{
    uint8_t i;
    GPIO_ResetBits(LCD_CS_GPIO, LCD_CS_PIN);
    for(i = 0; i < 8; i++)
    {
        if(data & 0x80)
            GPIO_SetBits(LCD_DIN_GPIO, LCD_DIN_PIN);
        else
            GPIO_ResetBits(LCD_DIN_GPIO, LCD_DIN_PIN);

        GPIO_SetBits(LCD_CLK_GPIO, LCD_CLK_PIN);
        delay_us(DELAY_TIME);
        GPIO_ResetBits(LCD_CLK_GPIO, LCD_CLK_PIN);
        delay_us(DELAY_TIME);
        data <<= 1;
    }
    GPIO_SetBits(LCD_CS_GPIO, LCD_CS_PIN);
}

void lcd_write_command(uint8_t cmd)
{
    GPIO_ResetBits(LCD_RST_GPIO, LCD_RST_PIN);
    delay_us(DELAY_TIME);
    GPIO_SetBits(LCD_RST_GPIO, LCD_RST_PIN);
    delay_us(DELAY_TIME);

    GPIO_ResetBits(LCD_CS_GPIO, LCD_CS_PIN);
    GPIO_ResetBits(LCD_CLK_GPIO, LCD_CLK_PIN);
    GPIO_SetBits(LCD_CLK_GPIO, LCD_CLK_PIN);
    GPIO_ResetBits(LCD_CLK_GPIO, LCD_CLK_PIN);

    GPIO_ResetBits(LCD_CS_GPIO, LCD_CS_PIN);
    lcd_write_byte(cmd);
}

void lcd_write_data(uint8_t data)
{
    lcd_write_command(0x01);
    GPIO_ResetBits(LCD_CS_GPIO, LCD_CS_PIN);
    GPIO_SetBits(LCD_CLK_GPIO, LCD_CLK_PIN);
    GPIO_ResetBits(LCD_CLK_GPIO, LCD_CLK_PIN);
    GPIO_SetBits(LCD_CS_GPIO, LCD_CS_PIN);

    GPIO_ResetBits(LCD_CS_GPIO, LCD_CS_PIN);
    lcd_write_byte(data);
}

void lcd_initialize()
{
    lcd_write_command(0x30);
    lcd_write_command(0x0c);
    lcd_write_command(0x01);
    delay_us(DELAY_TIME);
    lcd_write_command(0x06);
    lcd_write_command(0x02);
}

void lcd_clear()
{
    uint8_t i, j;
    for(i = 0; i < 8; i++)
    {
        lcd_write_command(0x80 | (i << 3));
        for(j = 0; j < 16; j++)
            lcd_write_data(' ');
    }
}

void lcd_display_string(uint8_t x, uint8_t y, char* str)
{
    uint8_t i;
    lcd_write_command(0x80 | (y << 3) | x);
    for(i = 0; str[i] != '\0'; i++)
        lcd_write_data(str[i]);
}

该示例程序使用PA3作为LCD的复位信号，PA4作为片选信号，PA5作为时钟信号，PA7作为数据信号。在main函数中，首先进行GPIO初始化，然后调用lcd_initialize()函数对LCD进行初始化。在循环中，调用lcd_clear()函数清除屏幕，并调用lcd_display_string()函数在指定位置显示字符串。其中，lcd_write_byte()函数用于向LCD写入一个字节的数据或命令，lcd_write_command()函数用于向LCD写入一个命令，lcd_write_data()函数用于向LCD写入一个数据，lcd_initialize()函数用于对LCD进行初始化，lcd_clear()函数用于清除屏幕，lcd_display_string()函数用于在指定位置显示字符串。函数中使用了delay_us()函数进行微秒级延时，该函数的实现可以根据具体的硬件平台进行修改。