nrf24L01+ not all packages sent or received?

[Sergy]

Hi,

Im trying to send 20 packages of 30bytes each as fast as possible, so I created the following loop:

for( pack=0; pack<20; pack++) { w_tx_payload_noack(30, MegaBuffer[pointerOUT]); msprf24_activate_tx(); //__delay_cycles(5000); }

On the receiving side I get only 6 packets. If I decrease number to 10 packets then I receive only 3.

Im sure there should be a logical explanation. I tried to add a delay into the loop it didnt help. Here are the functions used:

void msprf24_activate_tx() { char c; msprf24_standby(); // Cancel any outstanding TX interrupt w_reg(RF24_STATUS, RF24_TX_DS|RF24_MAX_RT); c = r_reg(RF24_STATUS); // Pulse CE for 10us to activate PTX pulse_ce(); }

void pulse_ce() { CE_HIGH(); __delay_cycles(CE_HIGH_TIME); CE_LOW(); }

Any idea on where Im misusing the device?

Thanks, Sergey

[Carlos Cuevas]

I recommend you to use a logic analyzer permanently attached to the SPI port + CE + IRQ. I've resolved a lot of issues that otherwise could have taken me days to find out.

[Bastiaan]

Thanks for the suggestion, but i dont have one unfortunately.

[Guest]

Thanks for the suggestion, but i dont have one unfortunately.

[Sergy]

Ok, so what I found out is that if I run SPI at 200Khz it works fine, if the clock rate is increased to 4Mhz chip cant cope anymore and packages are not being transmitted. From datasheet it says maximum SPI frequency is 8Mhz. What could be the problem here?

[mike]

you don't say what msprf24_standby() is doing. At a guess, you don't seem to be checking if there is room in the fifos to send another packet. At 200Khz you are sending slow enough that it doesn't matter.