Error when turn on sensor with TWI

RE: Error when turn on sensor with TWI

Jørgen Holmefjord — Tue, 15 Oct 2019 08:08:47 GMT

[quote user="HuanVH"]And one more thing is, when I turned the sensor on and off, even though i2c was not declared, the chip was still restarted.[/quote]

Like I said in my answer above, the chip will only restart if an error is reported. Please debug the application to find which function is reporting an error.

RE: Error when turn on sensor with TWI

HuanVH — Tue, 08 Oct 2019 10:11:31 GMT

When I use the latest version. The scl, sda pins are all pulled up to vcc, which makes the sensor still work, because my hardware has SCL and SDA suspension resistors.
And one more thing is, when I turned the sensor on and off, even though i2c was not declared, the chip was still restarted.

RE: Error when turn on sensor with TWI

HuanVH — Tue, 08 Oct 2019 09:36:39 GMT

I mean when I need to save energy, so I turn off the sensor. When I need to read I turn it on.
The problem I'm having, even though the CPU is not sleeping, when I connect to the device, the device will turn on the sensor. The process of turning on the sensor caused the nrf52832 to be restarted.

Even though the sensor is set to power down, it still consumes about 0.51mA, which is great for my ble application.

        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_DEBUG("Connected");
            app_timer_stop(app_timer_adv);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
            APP_ERROR_CHECK(err_code);
            nrf_gpio_pin_write(BLE_SENSOR_PIN, 1);
            nrf_delay_ms(1);

            twi_init();            
            break;

RE: Error when turn on sensor with TWI

awneil — Tue, 08 Oct 2019 09:29:42 GMT

[quote userid="83281" url="~/f/nordic-q-a/52964/error-when-turn-on-sensor-with-twi/213768"]Whether declared or not declared i2c, the phenomenon still occurs[/quote]

So you're saying this has nothing to do with your I2C sensor - it is purely a BLE thing?

If this is about energy saving, are you putting the CPU to sleep - so that the debugger loses connection ?

RE: Error when turn on sensor with TWI

HuanVH — Tue, 08 Oct 2019 02:29:48 GMT

I previously used this latest HW version, but I had trouble reading one of my sensors, so I switched to the older version. Now, I will try to try the latest version again, many thanks

RE: Error when turn on sensor with TWI

HuanVH — Tue, 08 Oct 2019 01:21:18 GMT

I need to save energy for my ble application. So I turned off the sensor when there was no ble connection. A ble connection is a condition for me to turn on the sensor, but I cannot connect to the peripheral, when placing a connection command on nRF Connect, the debugger reports "Memory read failure".
Whether declared or not declared i2c, the phenomenon still occurs.

RE: Error when turn on sensor with TWI

Jørgen Holmefjord — Mon, 07 Oct 2019 11:28:41 GMT

Hi,

Any particular reason you are using a deprecated software (bit-bang) TWI driver? There are new (HW) drivers located in nRF5_SDK_15.3.0_59ac345\modules\nrfx\drivers\src - nrfx_twi.c and nrfx_twim.c, and these can also be used with the legacy API found in nRF5_SDK_15.3.0_59ac345\integration\nrfx\legacy\nrf_drv_twi.h.

If the chip rebooted, you most likely ended up in the error handler. Please check out this post about debugging errors.

Best regards,
Jørgen

RE: Error when turn on sensor with TWI

awneil — Mon, 07 Oct 2019 11:21:50 GMT

So does turning the sensor on/off work without the BLE connection?

Does the BLE connection work on its own?

[quote userid="83281" url="~/f/nordic-q-a/52964/error-when-turn-on-sensor-with-twi"]I have a problem connecting[/quote]

What "connection" ar you referring to?

What "problem" are you having?