帮我写个STM32和LCD12864通信的代码

以下是一个简单的 STM32 和 LCD12864 通信的代码示例，仅供参考：

#include "stm32f10x.h"

#define LCD_RS_HIGH   GPIOA->BSRR = GPIO_BSRR_BS0
#define LCD_RS_LOW    GPIOA->BSRR = GPIO_BSRR_BR0
#define LCD_RW_HIGH   GPIOA->BSRR = GPIO_BSRR_BS1
#define LCD_RW_LOW    GPIOA->BSRR = GPIO_BSRR_BR1
#define LCD_E_HIGH    GPIOA->BSRR = GPIO_BSRR_BS2
#define LCD_E_LOW     GPIOA->BSRR = GPIO_BSRR_BR2

void delay_us(uint32_t nus)
{
    volatile uint32_t i;
    for(i = 0; i < nus * 8; i++);
}

void LCD_WriteData(uint8_t data)
{
    GPIOB->ODR = data;
    LCD_RS_HIGH;
    LCD_RW_LOW;
    LCD_E_HIGH;
    delay_us(1);
    LCD_E_LOW;
}

void LCD_WriteCmd(uint8_t cmd)
{
    GPIOB->ODR = cmd;
    LCD_RS_LOW;
    LCD_RW_LOW;
    LCD_E_HIGH;
    delay_us(1);
    LCD_E_LOW;
}

void LCD_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 
                                  | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    LCD_E_LOW;
    LCD_RW_LOW;
    LCD_RS_LOW;

    delay_us(40000);
    LCD_WriteCmd(0x38);
    delay_us(4000);
    LCD_WriteCmd(0x38);
    delay_us(4000);
    LCD_WriteCmd(0x38);
    delay_us(4000);
    LCD_WriteCmd(0x0c);
    delay_us(4000);
    LCD_WriteCmd(0x01);
    delay_us(4000);
    LCD_WriteCmd(0x06);
    delay_us(4000);
}

int main(void)
{
    LCD_Init();

    while(1)
    {
        LCD_WriteCmd(0x80);
        delay_us(4000);
        LCD_WriteData('H');
        delay_us(4000);
        LCD_WriteData('e');
        delay_us(4000);
        LCD_WriteData('l');
        delay_us(4000);
        LCD_WriteData('l');
        delay_us(4000);
        LCD_WriteData('o');
        delay_us(4000);
        LCD_WriteData(',');
        delay_us(4000);
        LCD_WriteData('W');
        delay_us(4000);
        LCD_WriteData('o');
        delay_us(4000);
        LCD_WriteData('r');
        delay_us(4000);
        LCD_WriteData('l');
        delay_us(4000);
        LCD_WriteData('d');
        delay_us(4000);
        LCD_WriteData('!');
        delay_us(4000);
    }
}

请注意，此代码仅用于演示 STM32 和 LCD12864 通信的基本原理，实际应用中还需要根据具体的硬件连接和程序需求进行适当的修改。并且本人无法保证代码的完全正确性，需要您自己进行测试和调试。