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Problems in UART functioning | Cypress Semiconductor

Problems in UART functioning

Summary: 1 Reply, Latest post by Bob Marlowe on 29 Mar 2016 02:51 AM PDT
Verified Answers: 1
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There are two UART interfaces in my project, one with the laptop and one with the GSM/GPS module. One with the laptop is correctly working on pins P1.4 and P1.5 using UART SCB mode. I assigned pins P0.2 and P0.3 for GSM/GPS module using UART v2.50.I am trying to display data received from GPS/GSM module on hyperterminal of the laptop. But the screen displays strings sent on laptop UART interface only and not the data received(on P0.2 and P0.3) from module. Baud rate and other settings of hyperterminal are also checked.

I have attached my project file herewith. "Hello welcome" appears on the hyperterminal. But no further data is displayed. UARTpc uses SCB mode and P0.2 and P0.3, UARTmod is for module and uses v2.50and pins P1.4 and P1.5 . Any solution for this?

user_1377889's picture
9274 posts

You are probably using one of the Cypress Kits for your project (Which one??)

On the programming part of the Kit is a UART-USB bridge realized which you already use for the laptop connection. The other UART pins are on 5V (or 3,3V, depending on your kit/setting), your GPS module probably on RS232 levels with +-12V.

Those voltages can fry your PSoC!! You will need a level-shifter as the MAX232

Have a look into your Kit's schematic, one of the pins (P0.2 or P0.3) might be in use by some hardware or bypass cap.



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