详细写出PIC32MZ单片机使用SPI点亮GC9A01显示屏的代码

好的，以下是使用PIC32MZ单片机通过SPI点亮GC9A01显示屏的代码：

#include <xc.h>
#include <stdint.h>

#pragma config FPLLODIV = DIV_1, FPLLMUL = MUL_20, FPLLIDIV = DIV_2, FWDTEN = OFF
#pragma config POSCMOD = HS, FNOSC = PRIPLL, FPBDIV = DIV_1, ICESEL = ICS_PGx1

#define GC9A01_WIDTH 128
#define GC9A01_HEIGHT 160

void init_spi() {
    SPI2CONbits.ON = 0; // 关闭SPI2模块
    SPI2CONbits.MSTEN = 1; // 设置为主机模式
    SPI2CONbits.CKP = 0; // 时钟极性为0
    SPI2CONbits.CKE = 1; // 时钟边缘为1
    SPI2CONbits.SMP = 0; // 采样数据在时钟中间
    SPI2BRG = 3; // 设置SPI时钟频率为40MHz
    SPI2CONbits.ON = 1; // 开启SPI2模块
}

void spi_write_byte(uint8_t data) {
    while (SPI2STATbits.SPITBF); // 等待发送缓冲区为空
    SPI2BUF = data; // 向SPI发送数据
    while (!SPI2STATbits.SPIRBF); // 等待接收缓冲区有数据
    uint8_t dummy = SPI2BUF; // 读取接收到的数据
}

void gc9a01_set_address_window(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) {
    spi_write_byte(0x2A); // 设置列地址
    spi_write_byte(x0 >> 8); // x0高8位
    spi_write_byte(x0 & 0xFF); // x0低8位
    spi_write_byte(x1 >> 8); // x1高8位
    spi_write_byte(x1 & 0xFF); // x1低8位

    spi_write_byte(0x2B); // 设置行地址
    spi_write_byte(y0 >> 8); // y0高8位
    spi_write_byte(y0 & 0xFF); // y0低8位
    spi_write_byte(y1 >> 8); // y1高8位
    spi_write_byte(y1 & 0xFF); // y1低8位

    spi_write_byte(0x2C); // 写入内存数据
}

void gc9a01_init() {
    spi_write_byte(0x01); // 软复位
    delay_ms(5); // 延时5ms

    spi_write_byte(0x11); // 睡眠离开命令
    delay_ms(120); // 等待120ms

    spi_write_byte(0x3A); // 打开像素格式设置
    spi_write_byte(0x05); // 16位色深

    spi_write_byte(0x36); // 设置扫描方向
    spi_write_byte(0x08); // 水平方向从左到右，垂直方向从下到上

    spi_write_byte(0xB2); // 设置PWM频率和极性
    spi_write_byte(0x0C); // 6.67kHz PWM频率
    spi_write_byte(0x0C); // PWM极性为正

    spi_write_byte(0xE0); // 设置Gamma校正
    spi_write_byte(0x12);
    spi_write_byte(0x1C);
    spi_write_byte(0x10);
    spi_write_byte(0x18);
    spi_write_byte(0x33);
    spi_write_byte(0x2C);
    spi_write_byte(0x25);
    spi_write_byte(0x28);
    spi_write_byte(0x28);
    spi_write_byte(0x27);
    spi_write_byte(0x2F);
    spi_write_byte(0x3C);
    spi_write_byte(0x00);
    spi_write_byte(0x03);
    spi_write_byte(0x03);
    spi_write_byte(0x10);

    spi_write_byte(0xE1); // 设置Gamma校正
    spi_write_byte(0x12);
    spi_write_byte(0x1C);
    spi_write_byte(0x10);
    spi_write_byte(0x18);
    spi_write_byte(0x2D);
    spi_write_byte(0x28);
    spi_write_byte(0x23);
    spi_write_byte(0x28);
    spi_write_byte(0x28);
    spi_write_byte(0x26);
    spi_write_byte(0x2F);
    spi_write_byte(0x3B);
    spi_write_byte(0x00);
    spi_write_byte(0x03);
    spi_write_byte(0x03);
    spi_write_byte(0x10);

    spi_write_byte(0x29); // 打开显示
}

void gc9a01_fill_screen(uint16_t color) {
    gc9a01_set_address_window(0, 0, GC9A01_WIDTH - 1, GC9A01_HEIGHT - 1); // 设置地址窗口
    for (uint32_t i = 0; i < GC9A01_WIDTH * GC9A01_HEIGHT; i++) {
        spi_write_byte(color >> 8);
        spi_write_byte(color & 0xFF);
    }
}

int main() {
    init_spi(); // 初始化SPI2模块
    gc9a01_init(); // 初始化GC9A01显示屏
    gc9a01_fill_screen(0xFFFF); // 填充屏幕为白色
    return 0;
}

请注意，代码中的SPI时钟频率为40MHz，这是GC9A01的最大通信速率。如果需要更慢的速率，请相应地调整SPI时钟频率。同时，GC9A01的分辨率为128x160，颜色深度为16位。在初始化时，我们设置了Gamma校正和PWM频率等参数，以确保显示效果最佳。