利用MultiTimer进行ILI9341 TFT屏驱动移植

1.多任务运行说明

此次测试是在之前MultiTimer的基础上增加ILI9341 TFT屏驱动，并同时运行led灯闪+串口打印+TFT屏显示三个任务，看起来像是同时运行的，实际上是利用了MultiTimer的功能进行时间片轮询操作。

2.TFT屏驱动移植

TFT屏驱动采用GDF310的硬件SPI,IO口接法如下；由于都是数据往屏幕写，没有涉及返回的数据，实际上PA6<--SPI0_MISO可以不接；另外就是注意PA5只连到了JP2的中间脚，如果接线到JP7或者JP8上的PA5，需要在JP2上街跳线帽；我的线是接到JP8的PA5脚的，因此用跳线帽将JP2的PA5与Dx相连;

PA5 SPI0_SCK
PA6 SPI0_MISO
PA7 SPI0_MOSI
PB5 LCD_CS
PB4 LCD_RST
PB3 LCD_D/C

驱动代码我参考了GD32F150R的SPI_TFT_LCD_Driver，运气比较好，拿过来小改了一下就可以跑了；以下是屏幕测试代码，

void tft_test_func(void)
{
    switch(tft_test.state)
    {
        case 0:
            num_test2(); 
            break;

        case 1:
            font_test2_1();
            break;

        case 2:
            font_test2_2();
            break;

        case 3:
            color_test2(BLUE,YELLOW,"Yellow");
            break;     
        case 4:
            color_test2(BLACK,WHITE,"White");            
            break;

        case 5:
            color_test2(WHITE,BLACK,"Black");            
            break;

        case 6:
            color_test2(WHITE,RED,"Red");            
            break;

        case 7:
            color_test2(BLUE,GREEN,"Green");            
            break;

        case 8:
            color_test2(YELLOW,BLUE,"Blue");            
            break;
        
        case 9:
            draw_test2();
            break;

        default:
            break;
    }

    tft_test.state++;
    if(tft_test.state >= 10)
    {
        tft_test.state = 0;
    }        
}

3.主函数部分

总共创建了4个任务，全部由MultiTimerYield()进行调度运行，主程序部分代码如下,可以看到液晶屏显示的任务是放到exampleTimer1Callback()中运行了，定时周期为2s。

#include 
#include "gd32f3x0.h"
#include "gd32f310k_start.h"
#include "systick.h"
#include "MultiTimer.h"
#include "app.h"
#include "hal_uart.h"
#include "tft_test.h"
#include "lcd_driver.h"


MultiTimer timer1;
MultiTimer timer2;
MultiTimer timer3;
MultiTimer timer4;

void exampleTimer1Callback(MultiTimer* timer, void *userData)
{
    printf("exampleTimer1Callback-> %s.rn", (char*)userData);
    MultiTimerStart(timer, 2000, exampleTimer1Callback, userData);
    // gpio_bit_toggle(GPIOA, GPIO_PIN_8);
    tft_test_func();
}

void exampleTimer2Callback(MultiTimer* timer, void *userData)
{
    printf("exampleTimer2Callback-> %s.rn", (char*)userData);
}

void exampleTimer3Callback(MultiTimer* timer, void *userData)
{
    printf("exampleTimer3Callback-> %s.rn", (char*)userData);
    MultiTimerStart(timer, 4567, exampleTimer3Callback, userData);
}

void exampleTimer4Callback(MultiTimer* timer, void *userData)
{
    MultiTimerStart(timer, 500, exampleTimer4Callback, userData);
    gpio_bit_toggle(GPIOA, GPIO_PIN_8);
}

/*!
    brief      main function
    param[in]  none
    param[out] none
    retval     none
*/
int main(void)
{  
    systick_config();
    /* enable the LED GPIO clock */
    rcu_periph_clock_enable(RCU_GPIOA);
    rcu_periph_clock_enable(RCU_GPIOB);
    /* configure led GPIO port */ 
    gpio_mode_set(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_8);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_8);
    
    gpio_bit_reset(GPIOA, GPIO_PIN_8);
    
     /* initilize the com */
    usart0_gpio_config();
    usart0_config();
    
    /* initialize lcd */
    lcd_init();

    MultiTimerInstall(PlatformTicksGetFunc);

    MultiTimerStart(&timer1, 2000, exampleTimer1Callback, "2000ms CYCLE timer");
    MultiTimerStart(&timer2, 5000, exampleTimer2Callback, "5000ms ONCE timer");
    MultiTimerStart(&timer3, 3456, exampleTimer3Callback, "3456ms delay start, 4567ms CYCLE timer");
    MultiTimerStart(&timer4, 1000, exampleTimer4Callback, "500ms CYCLE timer");
    
    while(1){
       MultiTimerYield();
    }
}

审核编辑：刘清