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TVoge
TVoge
Associate II
May 21, 2019
Question

I-CUBE-LRWAN: Usart causes a low power issue

  • May 21, 2019
  • 3 replies
  • 1740 views

Hi,

I am developing software based on the l-CUBE LRWAN software and ran into some low power issues. I have a sensor connected to the USART2 and it is receiving data properly. The problem is that because i had to overwrite the  void HAL_UART_MspInit(UART_HandleTypeDef *huart) (located in vcom.c) function the device doesnt get into the lowpower mode.

When the sensor is working the current consumption in lowpowermode is around 4.0mA

When I dont overwrite the fuction (And thus dont have a working sensor) the current in LPM is around 4uA.

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3 replies

Mabra.3
Mabra.3
Associate II
July 11, 2019

hiii bro

i know you are asking, but i think you can help me in my problem:

I use the node B-L072Z-LRWAN1 with the example “end node�? of the stack “STM32CubeExpansion_LRWAN�?, the objectif it’s to send data of sensor to TTN. and I managed to send “int�? or "floa"t without problem to my TTN as first step.

on the other hand, I made a program of UART communication of the “B-L072Z-LRWAN1�? thanks to STM32CubeMX, and it’s working well.

Unfortunately I don’t know how integrated all the code that STM32CubeMX generated in the “end node�? project to send my UART data.

thanks in advence.

Tesla DeLorean
Tesla DeLorean
Guru
July 11, 2019

https://community.st.com/s/question/0D50X0000B4433ASQQ/uart-communication-in-the-node-bl072zlrwan1-end-node-exemple

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Mabra.3
Mabra.3
Associate II
July 12, 2019

i see, in my case i have a sensor connected to the USART2 too, when i make a code using cubemx it's working but when i try to integrate it with the end node exemple it give nothing.

please if you can help me with that it's urgent.

TVoge
TVogeAuthor
Associate II
July 18, 2019

Hi,

Do you have the same problem when you connect the sensor to usart1?

Mabra.3
Mabra.3
Associate II
July 18, 2019

thank you so much for your replay, i apreciate it

i tried the USART2 it gaves the same result, please if you can help me with that problem because I'm stuck .

TVoge
TVogeAuthor
Associate II
July 29, 2019

The USART2 is allready initialized in the vcom filles for the usb communication. You could try to remove all these functions and init your sensor. This solved the problems i had with USART2.

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