処理時間を計測する #9

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1. ShotaAk commented on Sep 30, 2023

   

   ShotaAk

   on Sep 30, 2023

   Last edited by ShotaAk

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   M5.update() : 約 11.5 usec

     auto start_time = micros();
     M5.update();
     M5_LOGI("elapsed time [us]:%d", micros() - start_time);
2. ShotaAk commented on Sep 30, 2023

   

   ShotaAk

   on Sep 30, 2023

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   コマンド受信（データがないとき）： 58 ~ 68 usec

     auto start_time = micros();
     if(g_receiver.receive()) {
       // M5_LOGD("Received command!");
     }
     M5_LOGI("elapsed time:%d", micros() - start_time);
3. ShotaAk commented on Sep 30, 2023

   

   ShotaAk

   on Sep 30, 2023

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   I2Cのデータ送信（100kHz）：819 ~ 827 usec

     auto start_time = micros();
     const unsigned char SLAVE_ADDR = 0x54;
     Wire1.beginTransmission(SLAVE_ADDR);
     Wire1.write(send_data, DATA_SIZE);
     
     if(Wire1.endTransmission() == 0) {
       // M5_LOGI("Sent command!");
     } else {
       M5_LOGD("Failed to send command!");
     }
     M5_LOGI("elapsed time:%d", micros() - start_time);
4. ShotaAk commented on Sep 30, 2023

   

   ShotaAk

   on Sep 30, 2023

   Last edited by ShotaAk

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   loop関数：880 ~ 910 usec

   i2cのクロックを400kHzに変更後：350 ~ 360 usec

   unsigned long start_time = 0;
   void loop() {
     M5_LOGI("elapsed time:%d", micros() - start_time);
     start_time = micros();
5. ShotaAk commented on Sep 30, 2023

   

   ShotaAk

   on Sep 30, 2023

   ContributorAuthor

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   I2Cのデータ送信（400kHz）：270 ~ 273 usec

     Wire1.begin(M5.In_I2C.getSDA(), M5.In_I2C.getSCL(), 400000);
   
     auto start_time = micros();
     const unsigned char SLAVE_ADDR = 0x54;
     Wire1.beginTransmission(SLAVE_ADDR);
     Wire1.write(send_data, DATA_SIZE);
     
     if(Wire1.endTransmission() == 0) {
       // M5_LOGI("Sent command!");
     } else {
       M5_LOGD("Failed to send command!");
     }
     M5_LOGI("elapsed time:%d", micros() - start_time);