请你书写代码，实现：STM32在100100处画120120正方形，背景为红色，方块为蓝色

好的，以下是代码实现：

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

void drawSquare(int x, int y, int size, int bgColor, int sqColor);

void setup()
{
    // 开启GPIO和TIM时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_TIM1, ENABLE);

    // 配置PA8为TIM1通道1的输出PWM
    GPIO_InitTypeDef gpioInit;
    gpioInit.GPIO_Pin = GPIO_Pin_8;
    gpioInit.GPIO_Mode = GPIO_Mode_AF_PP;
    gpioInit.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &gpioInit);

    // 配置TIM1为PWM模式
    TIM_TimeBaseInitTypeDef timBaseInit;
    timBaseInit.TIM_Period = 7999;
    timBaseInit.TIM_Prescaler = 11;
    timBaseInit.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM1, &timBaseInit);

    TIM_OCInitTypeDef timOcInit;
    timOcInit.TIM_OCMode = TIM_OCMode_PWM1;
    timOcInit.TIM_OutputState = TIM_OutputState_Enable;
    timOcInit.TIM_Pulse = 0;
    TIM_OC1Init(TIM1, &timOcInit);
    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);

    // 启动TIM1
    TIM_Cmd(TIM1, ENABLE);
}

int main(void)
{
    // 初始化
    setup();

    // 画正方形，默认位置和大小为(100, 100, 120)
    drawSquare(100, 100, 120, 0xff0000, 0x0000ff);

    // 死循环
    while (1);

    return 0;
}

void drawSquare(int x, int y, int size, int bgColor, int sqColor)
{
    uint16_t init_x = x;
    uint16_t init_y = y;

    // 配置SPI接口
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);

    GPIO_InitTypeDef gpio_init;
    gpio_init.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7 | GPIO_Pin_4;
    gpio_init.GPIO_Speed = GPIO_Speed_10MHz;
    gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &gpio_init);

    spi_init();

    // 画背景色（红色）
    set_color(bgColor);
    spi_set_pos(init_x, init_y, init_x+size-1, init_y+size-1);
    for (int i = 0; i < size*size; i++)
    {
        spi_write_data(bgColor >> 8);
        spi_write_data(bgColor & 0xff);
    }

    // 画正方形（蓝色）
    set_color(sqColor);
    spi_set_pos(init_x+1, init_y+1, init_x+size-2, init_y+size-2);
    for (int i = 0; i < (size-2)*(size-2); i++)
    {
        spi_write_data(sqColor >> 8);
        spi_write_data(sqColor & 0xff);
    }
}

void spi_init() {
    SPI_InitTypeDef spi_init;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    spi_init.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    spi_init.SPI_Mode = SPI_Mode_Master;
    spi_init.SPI_DataSize = SPI_DataSize_16b;
    spi_init.SPI_CPOL = SPI_CPOL_High;
    spi_init.SPI_CPHA = SPI_CPHA_2Edge;
    spi_init.SPI_NSS = SPI_NSS_Soft;
    spi_init.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
    spi_init.SPI_FirstBit = SPI_FirstBit_MSB;
    spi_init.SPI_CRCPolynomial = 7;

    SPI_Init(SPI1, &spi_init);

    SPI_Cmd(SPI1, ENABLE);
}

void set_color(uint16_t color) {
    TIM1->CCR1 = (color >> 8) << 2;
}

void spi_send_cmd(uint8_t cmd){
    GPIO_ResetBits(GPIOA, GPIO_Pin_4);
    SPI_I2S_SendData(SPI1, cmd);
    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);
}

void spi_send_data(uint8_t data){
    GPIO_SetBits(GPIOA, GPIO_Pin_4);
    SPI_I2S_SendData(SPI1, data);
    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);
}

void spi_set_pos(uint16_t x_start, uint16_t y_start, uint16_t x_end, uint16_t y_end){
    spi_send_cmd(0x2A);//Column Command Set
    spi_send_data(x_start >> 8);
    spi_send_data(x_start & 0xff);
    spi_send_data(x_end >> 8);
    spi_send_data(x_end & 0xff);

    spi_send_cmd(0x2B);//Row Command Set
    spi_send_data(y_start >> 8);
    spi_send_data(y_start & 0xff);
    spi_send_data(y_end >> 8);
    spi_send_data(y_end & 0xff);

    spi_send_cmd(0x2C);//Memory Write
}

void spi_write_data(uint16_t data) {
    spi_send_data(data >> 8);
    spi_send_data(data & 0xff);
}