Ble uart application wont run when just plugin supply

RE: Ble uart application wont run when just plugin supply

RK — Wed, 24 Aug 2016 00:50:05 GMT

write an error handler which just idle loops (and turns on an LED so you can see when it's there). Then start your board up, wait for it to get to the error handler and THEN attach a debugger to it. You can attach debuggers to running processors. Then halt the CPU and you can trace down the problem.

Something like Segger's ozone debugger is all you need for this, it basically just drives the Segger JLINK and lets you load the elf file so it can show you where it is.

RE: Ble uart application wont run when just plugin supply

Inspectron — Tue, 23 Aug 2016 13:47:40 GMT

I did not load a bootloader on the chip. But I will try it now. No I do not use hardware flowcontrol.

RE: Ble uart application wont run when just plugin supply

Alex — Tue, 23 Aug 2016 13:45:10 GMT

Do you use hardware flow control? If not then remove them from settings as it may provide additional error code during initialization if hardware in wrong state. another option is that your bootloader initializes uart so your second time initialization returns error.

RE: Ble uart application wont run when just plugin supply

Alex — Tue, 23 Aug 2016 13:35:35 GMT

Now think how to get that error code. Also make sure you don't call APP_UART_FIFO_INIT or app_uart_init or APP_UART_INIT anywhere in your code second time.

RE: Ble uart application wont run when just plugin supply

Inspectron — Tue, 23 Aug 2016 13:32:04 GMT

when I comment out APP_ERROR_CHECK(err_code) then it works. So I will stuck into an error handler. But why only when I unplug and plug again?

RE: Ble uart application wont run when just plugin supply

Alex — Tue, 23 Aug 2016 13:26:34 GMT

comment out APP_ERROR_CHECK(err_code) and see the difference

RE: Ble uart application wont run when just plugin supply

Inspectron — Tue, 23 Aug 2016 13:24:01 GMT

If I comment uart_init then it will automaticly run by supply. But I will try this with the LED.

RE: Ble uart application wont run when just plugin supply

Alex — Tue, 23 Aug 2016 13:20:37 GMT

I think Ole asked you to debug your code by placing code to turn any LED on after APP_ERROR_CHECK(err_code) in uart_init to make sure code not stuck in error handler. Or to make sure that you don't have DEBUG defined in your code while programming with Keil because if not defined then error handler won't block code execution in case of error. Or just comment APP_ERROR_CHECK(err_code) and try again if you 100% sure problem in uart_init. I would also check if bootloader is loaded, but you are saying that without uart_init all works...

RE: Ble uart application wont run when just plugin supply

Inspectron — Tue, 23 Aug 2016 12:21:44 GMT

The problem is, I cant really debugg this issue. Because it appears when I unplug and then plug in again. And this I cant do when the debugger is active

RE: Ble uart application wont run when just plugin supply

Ole Bauck — Tue, 26 Jul 2016 08:57:50 GMT

Do you have DEBUG defined in your preprocessor symbols? Or else the error handler will not be entered, see here.

RE: Ble uart application wont run when just plugin supply

Inspectron — Wed, 20 Jul 2016 11:07:21 GMT

I wont hit the error handler. So I dont really find where it halts. It will exactly in uart_init function stop. After the uart_init function I dont know where it goes

RE: Ble uart application wont run when just plugin supply

Ole Bauck — Tue, 19 Jul 2016 14:39:17 GMT

Can you check if the application starts at all or where in the application it halts? Turn on the LED at different places to see where it stops.

RE: Ble uart application wont run when just plugin supply

Inspectron — Tue, 19 Jul 2016 09:41:51 GMT

This is not possible, because on the other side is a distance sensor. And the sensor will also have no power when I unplug the supply.I tested it with a LED(which should blink). Yes, the behaviour is the same if the sensor is not connected to the module.

RE: Ble uart application wont run when just plugin supply

Ole Bauck — Tue, 19 Jul 2016 08:44:01 GMT

The device may be powered through the UART pins when you unplug the power, so when you plugin the supply again the device have not been powered off and will hence not run the startup code.

It is weird however that this is only the case when using SD.

Is the behaviour the same even though nothing is connected on the other side of the UART? How do you see that the code is not running (not advertising, LEDs not blinking)?