stm32f103c8t6 VGA显示一串数字程序

以下是一个简单的示例代码，可以在 stm32f103c8t6 上使用 VGA 显示一串数字：

#include "stm32f10x.h"

#define HSYNC_PIN GPIO_Pin_0
#define HSYNC_PORT GPIOA
#define VSYNC_PIN GPIO_Pin_1
#define VSYNC_PORT GPIOA
#define COLOR_PIN GPIO_Pin_2
#define COLOR_PORT GPIOA

#define HSYNC_TIM TIM2
#define HSYNC_TIM_RCC RCC_APB1Periph_TIM2

#define VGA_H_PIXELS 640
#define VGA_H_FRONT_PORCH 16
#define VGA_H_SYNC_PULSE 96
#define VGA_H_BACK_PORCH 48
#define VGA_H_TOTAL (VGA_H_PIXELS + VGA_H_FRONT_PORCH + VGA_H_SYNC_PULSE + VGA_H_BACK_PORCH)
#define VGA_V_PIXELS 480
#define VGA_V_FRONT_PORCH 10
#define VGA_V_SYNC_PULSE 2
#define VGA_V_BACK_PORCH 33
#define VGA_V_TOTAL (VGA_V_PIXELS + VGA_V_FRONT_PORCH + VGA_V_SYNC_PULSE + VGA_V_BACK_PORCH)

void VGA_Init(void);
void VGA_DrawPixel(uint16_t x, uint16_t y, uint16_t color);
void VGA_DrawChar(uint16_t x, uint16_t y, uint8_t c, uint16_t color);
void VGA_DrawString(uint16_t x, uint16_t y, char* str, uint16_t color);
void VGA_DrawNumber(uint16_t x, uint16_t y, uint32_t num, uint16_t color);
void VGA_HSyncHandler(void);
void VGA_VSyncHandler(void);

volatile uint16_t vga_frame_buffer[VGA_V_TOTAL][VGA_H_TOTAL];

int main(void)
{
    SystemInit();
    VGA_Init();

    while (1)
    {
        VGA_DrawNumber(VGA_H_PIXELS / 2 - 40, VGA_V_PIXELS / 2 - 8, 12345678, 0xFFFF);
    }
}

void VGA_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = HSYNC_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(HSYNC_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = VSYNC_PIN;
    GPIO_Init(VSYNC_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = COLOR_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(COLOR_PORT, &GPIO_InitStructure);

    RCC_APB1PeriphClockCmd(HSYNC_TIM_RCC, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = VGA_H_TOTAL - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(HSYNC_TIM, &TIM_TimeBaseStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = VGA_H_SYNC_PULSE;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(HSYNC_TIM, &TIM_OCInitStructure);

    TIM_ITConfig(HSYNC_TIM, TIM_IT_Update, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    TIM_Cmd(HSYNC_TIM, ENABLE);
}

void VGA_DrawPixel(uint16_t x, uint16_t y, uint16_t color)
{
    vga_frame_buffer[y][x] = color;
}

void VGA_DrawChar(uint16_t x, uint16_t y, uint8_t c, uint16_t color)
{
    uint8_t i, j;
    for (i = 0; i < 8; i++)
    {
        for (j = 0; j < 6; j++)
        {
            if ((Font6x8[c][j] >> i) & 0x01)
            {
                VGA_DrawPixel(x + j, y + i, color);
            }
        }
    }
}

void VGA_DrawString(uint16_t x, uint16_t y, char* str, uint16_t color)
{
    while (*str != '\0')
    {
        VGA_DrawChar(x, y, *str++, color);
        x += 6;
    }
}

void VGA_DrawNumber(uint16_t x, uint16_t y, uint32_t num, uint16_t color)
{
    char str[10];
    sprintf(str, "%lu", num);
    VGA_DrawString(x, y, str, color);
}

void VGA_HSyncHandler(void)
{
    static uint16_t h_count = 0;

    if (h_count < VGA_H_PIXELS)
    {
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 15));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 14));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 13));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 12));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 11));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 10));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 9));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 8));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 7));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 6));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 5));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 4));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 3));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 2));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)(vga_frame_buffer[VGA_V_TOTAL - 1][h_count] >> 1));
        GPIO_WriteBit(COLOR_PORT, COLOR_PIN, (BitAction)vga_frame_buffer[VGA_V_TOTAL - 1][h_count]);
    }

    h_count++;

    if (h_count >= VGA_H_TOTAL)
    {
        h_count = 0;
        TIM_ClearITPendingBit(HSYNC_TIM, TIM_IT_Update);
        VGA_VSyncHandler();
    }
}

void VGA_VSyncHandler(void)
{
    static uint16_t v_count = 0;

    if (v_count < VGA_V_PIXELS)
    {
        v_count++;
    }

    if (v_count == VGA_V_FRONT_PORCH)
    {
        GPIO_WriteBit(VSYNC_PORT, VSYNC_PIN, Bit_RESET);
    }

    if (v_count == VGA_V_FRONT_PORCH + VGA_V_SYNC_PULSE)
    {
        GPIO_WriteBit(HSYNC_PORT, HSYNC_PIN, Bit_RESET);
    }

    if (v_count == VGA_V_FRONT_PORCH + VGA_V_SYNC_PULSE + VGA_V_BACK_PORCH)
    {
        GPIO_WriteBit(HSYNC_PORT, HSYNC_PIN, Bit_SET);
    }

    if (v_count == VGA_V_TOTAL - 1)
    {
        v_count = 0;
        GPIO_WriteBit(VSYNC_PORT, VSYNC_PIN, Bit_SET);
    }
}

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(HSYNC_TIM, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(HSYNC_TIM, TIM_IT_Update);
        VGA_HSyncHandler();
    }
}

注意，此代码仅显示数字，您需要在代码中添加更多功能来实现您的需求。此外，您还需要将 STM32F103C8T6 连接到 VGA 显示器，以便显示输出。