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PSoC™ 4 Forum Discussions

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I'm trying to read the register contents from Artaflex CYRF6936-40LFXC radio modules on reset.


Till recently I used to get zeros from all registers. MISO pin showed a flat zero on CRO, with some abrupt pulses now and then.


I then reread the datasheet and realized that I had left RST pin and one of the two GND pins floating.


Datasheet says I have to connect 0.47uF from RST to VBAT but since VBAT is not available as a pin out from Artaflex module I have connected RST to VCC instead. I have shorted the two GND pins.


After doing this I started getting regular pulses on MISO pin. After 20 days of frustration, this was indeed a Eureka moment for me, so I wanted to read the register contents now.


I was expecting the default values to be read when I used CYFISNP_Read() function to read some registers like IO_CFG_ADR, PWR_CTRL_ADR and most importantly CYFISNP_FileRead() to read MFG_ID_ADR. But I was 0x00, 0xFF and some values in between. Today I removed all connections and reprogrammed the PSoC 4 and now the values are all 0's again.


Can someone please help me identify what I'm missing? 


Thanks and regards,



2 Replies
25 replies posted 10 replies posted 5 replies posted

Hi Shreesha,


Did you port the CYFISNP stack yourself or are you using the project from Cypress?


The project is available in the Github for download - https://github.com/cypresssemiconductorco/WUSB


This project was developed in Creator 2.2 and I have tested in Creator 3.0. The project works in both the build. We havent tested in other Creator versions. So try using the Creator3.0 . 


Are you in debug mode when you are seeing 0x00 . Can you try using UART and print out the register values instead of checking it in Debug mode ?



Level 10
Level 10
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Isn't the answer a bit late?