Can I read the content of RF register for LE1?

RE: Can I read the content of RF register for LE1?

Håkon Alseth — Fri, 21 Mar 2014 10:35:38 GMT

Hi Jacky,

You can use a counter in the RTC interrupt to emulate an extended period: RTC0_ISR() { static uint8_t counter; counter++ if(counter % 2) 4_seconds_have_elapsed_do_something(); }

The LE1 will first wake-up due to a pre-start period, so that clock sources are started up when the RTC ISR occurs. This is described in the datasheet at page 97. This is why you want to first go into register retention mode, then go into Standby-mode to wait for the RTC interrupt to be called.

Best regards Håkon

RE: Can I read the content of RF register for LE1?

Alice — Fri, 21 Mar 2014 10:26:08 GMT

Hi Håkon,

We use LE1 to do RFID card.We want to send data every 4 second by using RTC to wake up the chip.However,the MAX time of RTC  is 2 second,so how to make it?I want to try this:every 2 second to wake up the chip,but LE1 doesn't send data,LE1 will send data when it is waked up next 2 second.Could this be done?

Other question,when LE1 is waked up by RTC and RTC interrupt is enable,will LE1 go into interrupt function?LE1 runs the code where LE1 sleeps first or goes to interrupt function first?

Best regards Jacky

RE: Can I read the content of RF register for LE1?

Håkon Alseth — Tue, 18 Mar 2014 12:23:36 GMT

Hi Alice,

The RFSPI interface is not accessible on the pins, so that is not possible. You will then have to make a "wrapper" firmware on the LE1, or use a nRF24L01+ instead.

The peak current consumption of the nRF24LE1 when transmitting (no ACKing) will be along the number that you posted, depending on the CPU speed you're running on. If you are using auto-ACK, the PTX will go into RX mode, which consumes more power than the transmission. Please see the Chapter 3 in the datasheet for more information about Enhanced Shockburst.

Note: to reduce the peak current, you should set the MCU into PWRDWN=7 while waiting for the radio interrupt.

Best regards Håkon