CC2480 SYS_TEST_LOOPBACK

RFCE

Other Parts Discussed in Thread: MSP430F2232

I have developed a prototype board with the CC2480 and the MSP430F2232 and am trying to establish communications between the 2 using the USCI_A in SPI mode. The working code I have ported from the development kit, modifying the digital I/O and changing USCI_B to USCI_A, doesn't work correctly on my prototype, so I have written a short code to command the SYS_TEST_LOOPBACK. The issue I have is I am sending [0x01, 0x21, 0x41, 0xF4] and the response I get is [0x01, 0x61, 0x41, 0x00]. So all but the "Test Data" field is correct. It seems like the SPI communication is "sort of" working, as it does send back the right packet format for the SRSP, but the test data is incorrect. Is there any known case for this? Is it likely a hardware/board issue or a software issue? I have tried for days to track down any hardware or software bug and haven't seen anything I can pinpoint as the problem. The same code, with digital I/O and USCI switched, works on the development kit and returns the correct test data. Any insight or suggestions are greatly appreciated. Thanks.

over 17 years ago

0 RFCE over 17 years ago

Intellectual 740 points

For the sake of providing an answer to my own question. All I needed to do was add a delay after handling the SYS_RESET_IND command reception. It appears that the chip had not finished initializing.

0 nancy! over 17 years ago in reply to RFCE

TI__Intellectual 1955 points

You're not the only one :)

0 Morten Braathen over 17 years ago in reply to RFCE

TI__Mastermind 19575 points

Hi RFCE,

Yes, please ensure that you handled the SYS_RESET_IND and check everything is OK prior to using any of the RPC commands for the CC2480 device.

LPRF Rocks the World

0 Jan Gampe over 16 years ago in reply to Morten Braathen

Prodigy 60 points

Hi everyone,

sorry for digging up this old thread, but it just matches my case. Except for the solution. Given a ez430-RF2480 (all values are hex):

I send a SYS_RESET_REQ (01 41 00 00) and handle the SYS_RESET_IND (06 41 80 02 00 00 00 00 00). After a couple of seconds, I follow up with a SYS_TEST_LOOPBACK, and the strange thing is, that every loopback with one byte of test data (01 21 41 xx) returns 00 (01 61 41 00). But every other possible size works just fine. I'd be grateful for any ideas.

Best regards

Jan Gampe

0 Pandit over 16 years ago in reply to Jan Gampe

Intellectual 905 points

Hi Jan Gampe,

It seems u r facing the problems what i faced till now. I can tell some points, before that i want to make sure which chip of msp430 family u r using? Using which compiler u r working?

That problem ll cause bcoz of timing problem only..... Use a correct clk frequency. Change a clk frequency and test.....

Talk to u soon.

0 Pandit over 16 years ago in reply to Pandit

Intellectual 905 points

Also for communication u r using SPI or UART?? If u r using SPI make sure delay used for SRDY in spiSREQ,spiAREQ and spiPOLL command.

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CC2480 SYS_TEST_LOOPBACK