GD32F303ZET6芯片，写一个使用SPI驱动TFT-LCD，能显示字符

好的，以下是使用SPI驱动TFT-LCD显示字符的代码：

#include "gd32f30x.h"

#define TFT_CS_PIN      GPIO_PIN_4
#define TFT_CS_PORT     GPIOB
#define TFT_DC_PIN      GPIO_PIN_5
#define TFT_DC_PORT     GPIOB

#define SPIx            SPI1

void TFT_WriteCommand(uint8_t cmd)
{
    gpio_bit_write(TFT_DC_PORT, TFT_DC_PIN, 0);   // DC = 0, 发送命令
    spi_i2s_data_transmit(SPIx, cmd);
    while (spi_i2s_flag_get(SPIx, SPI_FLAG_TBE) == RESET);
}

void TFT_WriteData(uint8_t data)
{
    gpio_bit_write(TFT_DC_PORT, TFT_DC_PIN, 1);   // DC = 1, 发送数据
    spi_i2s_data_transmit(SPIx, data);
    while (spi_i2s_flag_get(SPIx, SPI_FLAG_TBE) == RESET);
}

void TFT_Init(void)
{
    spi_parameter_struct spi_init_struct;
    rcu_periph_clock_enable(RCU_GPIOB);
    rcu_periph_clock_enable(RCU_SPI1);

    gpio_init(TFT_CS_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, TFT_CS_PIN);
    gpio_init(TFT_DC_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, TFT_DC_PIN);

    spi_i2s_deinit(SPIx);
    spi_init_struct.trans_mode           = SPI_TRANSMODE_FULLDUPLEX;
    spi_init_struct.device_mode          = SPI_MASTER;
    spi_init_struct.frame_size           = SPI_FRAMESIZE_8BIT;
    spi_init_struct.clock_polarity_phase = SPI_CK_PL_LOW_PH_1EDGE;
    spi_init_struct.nss                  = SPI_NSS_SOFT;
    spi_init_struct.prescale             = SPI_PSC_2;
    spi_init_struct.endian               = SPI_ENDIAN_MSB;
    spi_init(SPIx, &spi_init_struct);
    spi_enable(SPIx);

    gpio_bit_write(TFT_CS_PORT, TFT_CS_PIN, 0);   // CS = 0, 选中TFT-LCD

    TFT_WriteCommand(0x01); // SWRESET
    delay_1ms(10);
    TFT_WriteCommand(0x11); // SLPOUT
    delay_1ms(120);
    TFT_WriteCommand(0x3A); // COLMOD
    TFT_WriteData(0x05);    // 16-bit color
    TFT_WriteCommand(0x36); // MADCTL
    TFT_WriteData(0xC0);    // Set rotation
    TFT_WriteCommand(0xB1); // Frame rate control
    TFT_WriteData(0x01);
    TFT_WriteData(0x2C);
    TFT_WriteData(0x2D);
    TFT_WriteCommand(0xB2); // Analog setting
    TFT_WriteData(0x01);
    TFT_WriteData(0x11);
    TFT_WriteCommand(0xB3); // Enable PT
    TFT_WriteData(0x00);
    TFT_WriteCommand(0xC0); // Power control
    TFT_WriteData(0x10);
    TFT_WriteCommand(0xC5); // VCOM control
    TFT_WriteData(0x3E);
    TFT_WriteData(0x28);
    TFT_WriteCommand(0xC8); // GAMMA control
    TFT_WriteData(0x00);
    TFT_WriteData(0x06);
    TFT_WriteData(0x07);
    TFT_WriteData(0x01);
    TFT_WriteData(0x99);
    TFT_WriteData(0x00);
    TFT_WriteCommand(0xD0); // Power control
    TFT_WriteData(0x7F);
    TFT_WriteData(0x0D);
    TFT_WriteCommand(0xE0); // PGAMMA control
    TFT_WriteData(0x0F);
    TFT_WriteData(0x1F);
    TFT_WriteData(0x1C);
    TFT_WriteData(0x0C);
    TFT_WriteData(0x0F);
    TFT_WriteData(0x08);
    TFT_WriteData(0x48);
    TFT_WriteData(0x98);
    TFT_WriteData(0x37);
    TFT_WriteData(0x0A);
    TFT_WriteData(0x13);
    TFT_WriteData(0x04);
    TFT_WriteData(0x11);
    TFT_WriteData(0x0D);
    TFT_WriteData(0x00);
    TFT_WriteCommand(0xE1); // NGAMMA control
    TFT_WriteData(0x0F);
    TFT_WriteData(0x32);
    TFT_WriteData(0x2E);
    TFT_WriteData(0x0B);
    TFT_WriteData(0x0D);
    TFT_WriteData(0x05);
    TFT_WriteData(0x47);
    TFT_WriteData(0x75);
    TFT_WriteData(0x37);
    TFT_WriteData(0x06);
    TFT_WriteData(0x10);
    TFT_WriteData(0x03);
    TFT_WriteData(0x24);
    TFT_WriteData(0x20);
    TFT_WriteData(0x00);
    TFT_WriteCommand(0x29); // DISPON
}

void TFT_SetWindow(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2)
{
    TFT_WriteCommand(0x2A); // CASET
    TFT_WriteData(x1 >> 8);
    TFT_WriteData(x1 & 0xFF);
    TFT_WriteData(x2 >> 8);
    TFT_WriteData(x2 & 0xFF);

    TFT_WriteCommand(0x2B); // RASET
    TFT_WriteData(y1 >> 8);
    TFT_WriteData(y1 & 0xFF);
    TFT_WriteData(y2 >> 8);
    TFT_WriteData(y2 & 0xFF);

    TFT_WriteCommand(0x2C); // RAMWR
}

void TFT_DrawChar(uint16_t x, uint16_t y, char c, uint16_t color, uint16_t bg_color, uint8_t size)
{
    uint8_t i, j;
    if ((x >= 240) || (y >= 320) || ((x + 6 * size - 1) < x) || ((y + 8 * size - 1) < y))
    {
        return;
    }
    for (i = 0; i < 6; i++)
    {
        uint8_t line;
        if (i == 5)
        {
            line = 0x0;
        }
        else
        {
            line = font[c * 5 + i];
        }
        for (j = 0; j < 8; j++)
        {
            if (line & 0x1)
            {
                if (size == 1)
                {
                    TFT_DrawPixel(x + i, y + j, color);
                }
                else
                {
                    TFT_FillRect(x + (i * size), y + (j * size), size, size, color);
                }
            }
            else if (bg_color != color)
            {
                if (size == 1)
                {
                    TFT_DrawPixel(x + i, y + j, bg_color);
                }
                else
                {
                    TFT_FillRect(x + i * size, y + j * size, size, size, bg_color);
                }
            }
            line >>= 1;
        }
    }
}

void TFT_DrawString(uint16_t x, uint16_t y, char *str, uint16_t color, uint16_t bg_color, uint8_t size)
{
    while (*str)
    {
        TFT_DrawChar(x, y, *str++, color, bg_color, size);
        x += 6 * size;
    }
}

void TFT_DrawPixel(uint16_t x, uint16_t y, uint16_t color)
{
    TFT_SetWindow(x, y, x, y);
    TFT_WriteData(color >> 8);
    TFT_WriteData(color & 0xFF);
}

void TFT_FillRect(uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color)
{
    uint16_t i, j;
    for (i = x; i < x + w; i++)
    {
        for (j = y; j < y + h; j++)
        {
            TFT_DrawPixel(i, j, color);
        }
    }
}

int main(void)
{
    TFT_Init();

    while (1)
    {
        TFT_DrawString(20, 20, "Hello World!", 0xFFFF, 0x0000, 2);
        delay_1ms(1000);
        TFT_FillRect(20, 20, 12 * 12, 2 * 16, 0x0000);
        delay_1ms(1000);
    }
}

需要注意的是，这里使用的是一个5x7像素的字体库，可以自行替换成其他字体库。另外，需要根据具体的TFT-LCD型号，修改初始化函数中的一些命令和参数。