TypeScript pigpio.configureClock函數代碼示例

(function alert_pwm_measurement(): void {
    const Gpio = pigpio.Gpio;

    pigpio.configureClock(1, pigpio.CLOCK_PWM);

    let led = new Gpio(18, {
        mode: Gpio.OUTPUT,
        alert: true
    });

    led.digitalWrite(0);

    (function closure(): void {
        let pulseCounts: number[] = [];
        let pulses: number = 0;
        let risingTick: number = 0;
        let fallingTick: number;
        let i: number;

        led.on('alert', function event(level: number, tick: number): void {
            let pulseLength: number;

            if (level === 1) {
                risingTick = tick;
            } else {
                fallingTick = tick;
                pulseLength = fallingTick - risingTick;

                if (pulseCounts[pulseLength] === undefined) {
                    pulseCounts[pulseLength] = 0;
                }
                pulseCounts[pulseLength] += 1;

                pulses += 1;
                if (pulses === 1000) {
                    for (i = 0; i !== pulseCounts.length; i += 1) {
                        if (pulseCounts[i] !== undefined) {
                            console.log(i + 'us - ' + pulseCounts[i]);
                        }
                    }

                    led.digitalWrite(0);
                    led.disableAlert();
                }
            }
        });
    }());

    // frequency 250Hz, duty cycle 7us
    led.hardwarePwmWrite(250, 250 * 7);
})();

(function notifier_stress(): void {
    const Gpio = pigpio.Gpio;
    const Notifier = pigpio.Notifier;

    const LED_GPIO = 18;
    const FREQUENCY = 150000;

    pigpio.configureClock(1, pigpio.CLOCK_PCM);

    (function closure() {
        const led = new Gpio(LED_GPIO, { mode: Gpio.OUTPUT });

        led.hardwarePwmWrite(FREQUENCY, 500000);
    }());

    (function closure() {
        const ledNotifier = new Notifier({ bits: 1 << LED_GPIO });
        let notificationsReceived = 0;
        let events = 0;
        let seqnoErrors = 0;
        let ledStateErrors = 0;
        let lastSeqno: number;
        let lastLedState: number;
        let lastTick: number;
        let minTickDiff = 0xffffffff;
        let maxTickDiff = 0;
        let restBuf: Buffer | null = null;
        let iv: NodeJS.Timer;

        function printInfo() {
            console.log();
            console.log('  events: %d', events);
            console.log('  notifications: %d', notificationsReceived);
            console.log('  seqno errors: %d', seqnoErrors);
            console.log('  led state errors: %d', ledStateErrors);
            console.log('  expected tick diff: %d us', 1000000 / (FREQUENCY * 2));
            console.log('  min tick diff: %d us', minTickDiff);
            console.log('  max tick diff: %d us', maxTickDiff);

            minTickDiff = 0xffffffff;
            maxTickDiff = 0;
        }

        ledNotifier.stream().on('data', function event(buf: Buffer) {
            let entries: number;

            events += 1;

            if (restBuf !== null) {
                buf = Buffer.concat([restBuf, buf]);
            }

            entries = Math.floor(buf.length / Notifier.NOTIFICATION_LENGTH);
            const rest = buf.length % Notifier.NOTIFICATION_LENGTH;

            restBuf = rest === 0 ? null : new Buffer(buf.slice(buf.length - rest));

            for (let ix = 0; ix < buf.length - rest; ix += Notifier.NOTIFICATION_LENGTH) {
                const seqno = buf.readUInt16LE(ix);
                const tick = buf.readUInt32LE(ix + 4);
                const level = buf.readUInt32LE(ix + 8);

                if (notificationsReceived > 0) {
                    if (lastLedState === (level & (1 << LED_GPIO))) {
                        console.log('  unexpected led state');
                        ledStateErrors += 1;
                    }

                    if (((lastSeqno + 1) & 0xffff) !== seqno) {
                        console.log('  seqno error, was %d, expected %d', seqno, lastSeqno + 1);
                        seqnoErrors += 1;
                    }

                    if (tick - lastTick < minTickDiff) {
                        minTickDiff = tick - lastTick;
                    }

                    if (tick - lastTick > maxTickDiff) {
                        maxTickDiff = tick - lastTick;
                    }
                }

                notificationsReceived += 1;
                lastSeqno = seqno;
                lastLedState = level & (1 << LED_GPIO);
                lastTick = tick;
            }

            if (notificationsReceived >= 1e9) {
                ledNotifier.stream().pause();
                ledNotifier.close();
                clearInterval(iv);
                printInfo();
            }
        });

        iv = setInterval(printInfo, 5000);
    }());
})();

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

import { Gpio, configureClock, CLOCK_PWM } from 'pigpio';
import { Peripheral } from 'raspi-peripheral';
import { getGpioNumber } from 'raspi-board';
import { IPWM, IPWMModule, IPWMConfig } from 'j5-io-types';

const DEFAULT_FREQUENCY = 50;
const DEFAULT_RANGE = 40000;

export { IPWMConfig } from 'j5-io-types';

// Tell it to use the PWM clock for timing so that I2S still works. This does mean we can't use hardare PWM though.
configureClock(5, CLOCK_PWM);

export class SoftPWM extends Peripheral implements IPWM {

  private _pwm: Gpio;
  private _frequency: number;
  private _range: number;
  private _dutyCycle: number;

  public get frequency() {
    return this._frequency;
  }

  public get range() {
    return this._range;
  }