ez430-RF2500 Reception - Packets get corrupted

Priyesh P P

Other Parts Discussed in Thread: CC2500

Hi,

I am trying to make communication between two ez430-RF2500 boards. One as a transmitter- sends 10-byte long packet and other as a receiver -receives and writes to a serial port at 9600 baud rate. CC2500 has address filtering enabled variable packet length and address filtering enabled. GDO0 pin is (P2.6) is configured to give interrupt on Rx/Tx completion. MSP430 has 8MHZ calibrated internal oscillator as the clock source. SPI clock is 4MHz. IAR Embedded Workbench is used for firmware development

Issue - The receiver receives packets correctly only when the programme is being debugged from IAR. I can see the details of the packets received and are correct. But when I stop debugging and restart Rf2500, RXBYTE register shows packets are available bu when I read the FIFO I don't get what I sent.

Can someone help me to solve this?

Thanks

over 10 years ago

0 Ryan Brown1 over 10 years ago

TI__Guru**** 223077 points

Hi Priyesh,

The first thing you should try is reducing the SPI clock speed for CC2500 communication and see if that alleviates the issue, perhaps also increase the CPU frequency to 16 MHz calibrated. Have you referred to any working code examples for developing your code?

eZ430-RF2500 Sensor Monitor Demo: www.ti.com/.../slac139
eZ430-RF2500 Wiki: processors.wiki.ti.com/.../EZ430-RF2500

Regards,
Ryan

0 Priyesh P P over 10 years ago in reply to Ryan Brown1

Prodigy 130 points

Hi Ryan,

Thank you for your response!

I found the issue - wrong interrupt edge selection. IO pin of MSP430 was programmed to detect an L->H on GDO0 of CC2500, which happens immediately after the Sync word is received. As a result, MSP was reading the TXFIFO before the complete packet was received. I changed triggering edge to H->L and it worked.

I apologize for wasting your time.

Regards
Priyesh

0 Ryan Brown1 over 10 years ago in reply to Priyesh P P

TI__Guru**** 223077 points

Hello Priyesh,

There was no waste of time, thank you for responding to the thread with your solution.

Regards,
Ryan

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ez430-RF2500 Reception - Packets get corrupted