KW45 LOC: USB-to-UART0 not working

[BLEDev]

Hello NXP team,

I already have software that supports UART0 and UART1 communication, and I’ve verified it working on my custom hardware.

Now I’d like to test it on the KW45 LOC kit from NXP. I followed the instructions to set up a UART0 connection between the MCU and my computer for TX/RX testing with my software, but it only seems to work with UART1. Could you let me know if I might have missed a step?

JP13, JP14 : 2-3 shorted

Thanks!

[luis_maravilla]

Hello

In KW45B41Z-LOC Board User Manual Chapter 2.4 Figure 14 the image shows the LPUART diagram, the LPUART0 is connected to mickroBUS socket connector in J2 per default, if you want to use this configuration, Could you help us confirm your communication for UART0 is connected via J2 connector pins 3 (UART0_RX) and PIN 4 (UART0_TX)?

If you want to connect to MCU-Link, In table 11 indicate that bidirectional voltage translator U16 supports a USB-to-UART bridge between MCU Link and the target MCU by shifting voltage levels for LPUART0 alternative. If you confirmed the JP13 and JP14 are 2-3 shorted, could you share if the JP12 is open and JP21 are open?

For more information about this please refer to chapter 3.7 in KW45-LOC User Manual.

Best Regards

Luis

[BLEDev]

Hello @luis_maravilla 

Abou this:

"If you want to connect to MCU-Link, In table 11 indicate that bidirectional voltage translator U16 supports a USB-to-UART bridge between MCU Link and the target MCU by shifting voltage levels for LPUART0 alternative. If you confirmed the JP13 and JP14 are 2-3 shorted, could you share if the JP12 is open and JP21 are open?"

Yes I confirm that!

[luis_maravilla]

Hello,

Could you please help us confirm whether this configuration is causing any issues on your end, and if so, what kind?

The configuration refers to the hardware modifications made to the board. Please ensure that the corresponding changes are also implemented in the software, including proper declarations and function calls. The USB-to-UART bridge can be configured to use either the LPUART0 or LPUART1 module of the target MCU, depending on the jumper settings for JP13 and JP14.

Best regards,

Luis