#include "gd32vf103.h"
#include "systick.h"
#include <stdint.h>
#include "lcd/lcd.h"

#define ANALOG_PORT GPIOA
#define ANALOG_PIN GPIO_PIN_3
#define ANALOG_CHANNEL ADC_CHANNEL_3

#define RED_LED_PIN GPIO_PIN_13
#define RED_LED_PORT GPIOC

void init_ADC_example();

int main(void)
{
    uint16_t analog_read = 0;

    /* config ADC */
    /* 配置 ADC */
    init_ADC_example();

    Lcd_Init(); // init OLED
    LCD_Clear(BLACK);
    // 顯示漢字“中景園”
    LCD_ShowChinese(24, 0, 0, 16, YELLOW);
    LCD_ShowChinese(48, 0, 1, 16, RED);
    LCD_ShowChinese(72, 0, 2, 16, GREEN);
    // 圖型變量
    u16 x = 0;
    u16 y = 48;

    /* initiate the gpio for the red led on the longan board */
    /* 初始化 GPIO 用于閃爍紅色 LED */
    rcu_periph_clock_enable(RCU_GPIOC);
    gpio_init(RED_LED_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, RED_LED_PIN);

    /* This loop generates a software based PWM signal which has a duty cycle based on the read analog value 
       (if you need an actual PWM signal though check the PWM example where it's done in hardware instead) */
    while (1)
    {
        /* Read analog value on pin */
        /* 讀取引腳上的模擬值 */
        // analog_read = ADC_RDATA(ADC0);
        analog_read = adc_regular_data_read(ADC0);

        /* LCD 顯示 */
        LCD_ShowNum(80, 16, analog_read,4, MAGENTA);
        LCD_DrawPoint(x, y - 10 * analog_read / 100, BLUE);
        if (x > 159)
        {
            LCD_Clear(BLACK);
            // LCD_DrawRectangle(0,40,159,80,WHITE);
            x = 0;
        }
        x++;

        /* Red LED on */
        /* 點(diǎn)亮 LED */
        // gpio_bit_write(RED_LED_PORT, RED_LED_PIN, 0);

        /* If ADC reads a high voltage delay for a longer time */
        /* 如果 ADC 讀取高電壓延遲較長時(shí)間 */
        delay_1us(analog_read);

        /* Red LED off */
        /* 關(guān)閉 LED */
        // gpio_bit_write(RED_LED_PORT, RED_LED_PIN, 1);

        /* Delay for longer if ADC reads a low voltage */
        /* 如果 ADC 讀取低電壓业岁，則延遲更長 */
        // delay_1us(4096 - analog_read);
    }
}

void init_ADC_example()
{
    /* enable GPIOC clock */
    /* 打開 GPIO_C 時(shí)鐘 */
    rcu_periph_clock_enable(RCU_GPIOC);
    /* Initialize the GPIO that will be used for ADC. A0-A7 and B0-B1 are connected to an ADC-channel each. */
    /* 初始化將用于 ADC 的 GPIO。 A0-A7 和 B0-B1 分別連接到一個(gè) ADC 通道 */
    gpio_init(ANALOG_PORT, GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, ANALOG_PIN);
    /* enable ADC clock */
    /* 打開 ADC 時(shí)鐘 */
    rcu_periph_clock_enable(RCU_ADC0);

    /* Select the clock frequency that will be used for the ADC core. Refer to README for more info on what to select. */
    /* 選擇將用于 ADC 內(nèi)核的時(shí)鐘頻率纬乍。有關(guān)選擇內(nèi)容的更多信息第晰，請參閱自述文件 */
    // 108mhz 8分頻 13mhz  采樣周期 239.5+12.5 =252 個(gè)時(shí)鐘周期 除以 13mhz = 19.38us 頻率為 51587.3hz
    rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV8);

    /* Reset ADC0 configuration. GD32VF103 has two internal ADCs (ADC0, ADC1). */
    /* 重置 ADC_0 通道锁孟， 此芯片有兩個(gè) ADC 通道  */
    adc_deinit(ADC0);

    /* Set the ADCs to work independently. Refer to the manual for the different parallel modes available. */
    /* 將 ADC 設(shè)置為獨(dú)立工作。有關(guān)可用的不同并行模式茁瘦，請參閱手冊 */
    adc_mode_config(ADC_MODE_FREE);

    /* Set the conversion mode to continuous. Continious mode lets the ADC take measurements continiously without
       an external trigger. */
    /* 將轉(zhuǎn)換模式設(shè)置為連續(xù)品抽。連續(xù)模式讓 ADC 連續(xù)進(jìn)行測量，而無需一個(gè)外部觸發(fā)器甜熔。 */
    adc_special_function_config(ADC0, ADC_CONTINUOUS_MODE, ENABLE);

    /* Sets where padding is applied to the measurement. Data alignment right puts padding bits above MSB */
    /* 設(shè)置將填充應(yīng)用于測量的位置圆恤。數(shù)據(jù)對齊右將填充位置于 MSB 之上 */
    adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT);

    /* Selects how many channels to convert each time. This can be used to "queue" multiple channels. Here just one channel is selected. */
    /* 選擇每次轉(zhuǎn)換多少個(gè)頻道。這可用于“排隊(duì)”多個(gè)頻道腔稀。這里只選擇了一個(gè)頻道 */
    adc_channel_length_config(ADC0, ADC_REGULAR_CHANNEL, 1);

    /* Set the channel as the first "queued" conversion each time the ADC is activated. */
    /* 每次激活 ADC 時(shí)將通道設(shè)置為第一個(gè)“排隊(duì)”轉(zhuǎn)換,設(shè)置 adc 采周期*/
    adc_regular_channel_config(ADC0, 0, ANALOG_CHANNEL, ADC_SAMPLETIME_239POINT5);
    // 配置分辨率 12位
    adc_resolution_config(ADC0,ADC_RESOLUTION_12B);

    /* Since we are using continious conversion we do not want to use an external trigger. */
    /* 由于我們使用的是連續(xù)轉(zhuǎn)換哑了，我們不想使用外部觸發(fā)器 */
    adc_external_trigger_source_config(ADC0, ADC_REGULAR_CHANNEL, ADC0_1_EXTTRIG_REGULAR_NONE);
    adc_external_trigger_config(ADC0, ADC_REGULAR_CHANNEL, ENABLE);

    /**
     * @brief ADC 校準(zhǔn)過程
     * 內(nèi)部的模擬校準(zhǔn)通過設(shè)置 ADC_CTL1 寄存器的 RSTCLB 位來重置。
     * 1. 確保ADCON=1烧颖；
     * 2. 延遲14個(gè)ADCCLK以等待ADC穩(wěn)定弱左；
     * 3. 設(shè)置RSTCLB (可選的)；
     * 4. 設(shè)置CLB=1炕淮；
     * 5. 等待直到CLB=0拆火。
     */
    /* Enable ADC.*/
    /* 打開 ADC */
    adc_enable(ADC0); //  ADC_CTL1(adc_periph) |= (uint32_t)ADC_CTL1_ADCON;

    /* Let ADC stabilize */
    /* 讓ADC穩(wěn)定 */
    delay_1ms(1); // 第二步 等 ADC 穩(wěn)定，最少14個(gè) ADC 時(shí)鐘周期

    /* Calibrates the ADC against an internal source. */
    /* 根據(jù)內(nèi)部源校準(zhǔn) ADC */
    adc_calibration_enable(ADC0); // 第三涂圆、四们镜、五步完成校準(zhǔn)

    /* Start converting */
    /* 開始轉(zhuǎn)換 */
    adc_software_trigger_enable(ADC0, ADC_REGULAR_CHANNEL);
}