写一个 stm32 屏幕显示程序

你好，我可以回答这个问题。以下是一个简单的 STM32 屏幕显示程序的示例：

#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_spi.h"
#include "stm32f10x_tim.h"

#define LCD_CS_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_4)
#define LCD_CS_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_4)
#define LCD_DC_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_5)
#define LCD_DC_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_5)

void LCD_WriteCommand(uint8_t cmd) {
LCD_DC_LOW();
SPI_I2S_SendData(SPI1, cmd);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
}

void LCD_WriteData(uint8_t data) {
LCD_DC_HIGH();
SPI_I2S_SendData(SPI1, data);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
}

void LCD_Init(void) {
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);

GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI1, &SPI_InitStructure);

SPI_Cmd(SPI1, ENABLE);

LCD_CS_HIGH();
LCD_DC_HIGH();

LCD_WriteCommand(x21);
LCD_WriteCommand(xB1);
LCD_WriteCommand(x04);
LCD_WriteCommand(x14);
LCD_WriteCommand(x20);
LCD_WriteCommand(xC);
}

void LCD_SetPixel(uint8_t x, uint8_t y, uint8_t color) {
LCD_WriteCommand(x80 | x);
LCD_WriteCommand(x40 | y);
LCD_WriteData(color);
}

void LCD_Clear(void) {
for (uint8_t y = ; y < 48; y++) {
for (uint8_t x = ; x < 84; x++) {
LCD_SetPixel(x, y, );
}
}
}

int main(void) {
LCD_Init();
LCD_Clear();
while (1);
}

这个程序使用 SPI 接口控制一个 Nokia 511 LCD 屏幕，可以在屏幕上显示图像和文本。具体的实现细节可以参考代码中的注释。