evm5515 with cc2500 transceiver

talmor zilberman

Expert 1160 points

Other Parts Discussed in Thread: CC2500

Folks,

I'm using a evm5515 with cc2500 transceiver.

both comunicate via SPI interface.

according to the cc2500 data sheet a manual reset is accomplished by :

1. set SCLK=1 and SI=0

2. strobe CSn low/high

3. hold CSn high for 40 micro sec

4. pull CSn low and wait to SO to go low

5. issue SRES strobe

6. wait for SO to go low.

my question is how can I toggle the CSn pin and set SCLK and SI .

as for the SO i can monitor the CHIP_RDYn which is the 7th bit of the status byte.

Thanks,

Talmor

over 14 years ago

0 Hyun Kim over 14 years ago

TI__Genius 14965 points

Hi,

I assume you know what to do by reading other forum post that you can read/write through SPI.

Regards,

Hyun

0 Jim Noxon over 14 years ago

TI__Genius 14940 points

You'll need to put the MCBSP into digital I/O mode from where you can toggle the pins directly in the MCBSP registers. Once you have the details out of the way, you can reprogram the MCBSP to operate normally. I believe you can leave the CS bit in I/O mode and have your software control it manually if that makes things easier for you.

Jim Noxon

0 talmor zilberman over 14 years ago in reply to Hyun Kim

Expert 1160 points

Hi,

I haven't solved this issue. since I was able to read and write registers without following the above procedure I assume that the device perform the Auto reset (c2500 data sheet - page 40 Automatic POR)

0 talmor zilberman over 14 years ago in reply to Jim Noxon

Expert 1160 points

is it mandatory (manual reset) or can I relay on the Automatic POR (c2500 datasheet page 40)

0 Jim Noxon over 14 years ago in reply to talmor zilberman

TI__Genius 14940 points

The auto reset should be all you need for operation. You just need to make sure you have waited for SO to go low indicating the crystal is locked up. Then you can use the radio normally.

Jim Noxon

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evm5515 with cc2500 transceiver