nrf52 Radio example read always 0

RE: nrf52 Radio example read always 0

haakonsh — Wed, 25 Apr 2018 08:20:23 GMT

uint32_t nrf52::read()
{
NRF_RADIO->PACKETPTR = (uint32_t)m_packet;

The PACKETPTR is pointing to the address equal to the value of m_packet which is undefined. You need to take the address of m_packet with the '&' operator instead of its content.

RE: nrf52 Radio example read always 0

chinzw — Tue, 24 Apr 2018 16:01:38 GMT

I added a Serial.print() inside the CRC check condition.

RE: nrf52 Radio example read always 0

haakonsh — Tue, 24 Apr 2018 12:04:41 GMT

[quote user="chinzw"]First thing i checked was the CRC and that was fine.[/quote]

How did you check the CRC, I need to know details.

RE: nrf52 Radio example read always 0

chinzw — Tue, 24 Apr 2018 02:59:57 GMT

Well, i tried both things, but they didn't make any difference.

RE: nrf52 Radio example read always 0

chinzw — Mon, 23 Apr 2018 16:23:43 GMT

Hi Håkon,

Thanks for replying to my question.

I will try your second and third guesses. First thing i checked was the CRC and that was fine.

RE: nrf52 Radio example read always 0

haakonsh — Mon, 23 Apr 2018 13:10:22 GMT

Hey chinzw,

My first guess is that the CRC check fails. In that event you should receive 0.

Second guess is that the call to radio.write(123); is invalide because 123 is not declared and therefore its type will be int (int32_t), this is in violation of the maximum payload length that you have set to 1 byte. This should only truncate your payload though, but it's a bug that you are likely to hit sooner or later.

Third guess is that your empty while() statements are optimized away by your compiler, you should put the CPU to sleep while waiting with the following commands:

__WFE();
__SEV();
__WFE();

Cheers,

Håkon.