// 串口输出示例
2847
2910
2835
2924
2821
2938
// 浏览器配对: (2847,2910) (2835,2924) (2821,2938) ...

u16 ADC_ReadChannel(u8 channel) {
    u32 sum = 0;
    for (int i = 0; i < 4; i++) {                    // 4次采样取均值
        ADC_RegularChannelConfig(ADC1, channel, 1, ADC_SampleTime_55Cycles5);
        ADC_SoftwareStartConvCmd(ADC1, ENABLE);      // 启动转换
        while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC)); // 等待完成
        sum += ADC_GetConversionValue(ADC1);          // 读12bit结果
    }
    return (u16)(sum / 4);
}

u16 ReadLeftPressure(void)  { return ADC_ReadChannel(ADC_Channel_4); }  // PA4
u16 ReadRightPressure(void) { return ADC_ReadChannel(ADC_Channel_5); }  // PA5

int main(void) {
    System_Init();                                    // 时钟 72MHz
    ADC_Init();    UART1_Init(115200);              // 外设初始化

    u16 left, right;
    char buf[16];

    while (1) {
        left  = ReadLeftPressure();                   // PA4 ADC
        right = ReadRightPressure();                  // PA5 ADC

        // 串口交替发送: 左值\r\n右值\r\n
        sprintf(buf, "%d\r\n", left);
        UART1_SendString(buf);

        sprintf(buf, "%d\r\n", right);
        UART1_SendString(buf);

        delay_ms(10);                              // ~100Hz 采样率
    }
}

async function readSerialLoop() {
    const reader = port.readable.getReader();
    let buf = '', expected = 'L', curL = 0, curR = 0;

    while (true) {
        const { value, done } = await reader.read();
        if (done) break;
        buf += new TextDecoder().decode(value);

        const lines = buf.split('\n');
        buf = lines.pop();                            // 保留不完整行

        for (const line of lines) {
            const v = parseInt(line.trim());
            if (isNaN(v)) continue;
            if (expected === 'L') { curL = v; expected = 'R'; }
            else { curR = v; expected = 'L'; onFrame(curL, curR); }
        }
    }
}