sd_app_evt_wait cause uart not work.

RE: sd_app_evt_wait cause uart not work.

Susheel Nuguru — Wed, 29 May 2019 04:44:05 GMT

You should not use nrf_pwr_mgmt_run in vApplicationIdleHook when you are using tickless_dile. Can you please comment it?

I am also assuming that you are testing this on the PCA10040 development kit.

If the above suggestion did not help you, then I need to get your project to be able to reproduce it and give you a proper workaround.

RE: sd_app_evt_wait cause uart not work.

tianbing357 — Tue, 28 May 2019 08:34:33 GMT

i did as your advise, but it still not worked, the current is 7mA when use "#define configUSE_TICKLESS_IDLE 1", but 2mA use __WFE();

RE: sd_app_evt_wait cause uart not work.

Susheel Nuguru — Tue, 28 May 2019 07:34:00 GMT

I would strongly recommend you to download SDK15.3 and replace your SDK14\external\freertos folder with the SDK15.3\external\freertos folder. There were a couple of fixes that came later.

RE: sd_app_evt_wait cause uart not work.

tianbing357 — Sun, 26 May 2019 15:30:04 GMT

i tried, #define configUSE_TICKLESS_IDLE 1 , the power consumption is much higher than sd_app_evt_wait() ,i use SDK 14.2.

when use __WFE(); as follows:

void vApplicationIdleHook( void )
{
do{
__WFE();
} while (0 == (NVIC->ISPR[0] | NVIC->ISPR[1]));
}

the power consumption is a little higher than sd_app_evt_wait(). why?

RE: sd_app_evt_wait cause uart not work.

Susheel Nuguru — Thu, 09 May 2019 11:09:21 GMT

[quote user="tianbing357"]the "nrf_drv_uart" or UART FIFO can realize my needs?[/quote]

Well using a simple_uart should be good enough for the simple use case you are using.

If you are using APP_Timer to trigger the transfer and the UARTE0_UART0_IRQHandler makes sure to read the UART FIFO and push it to RAM, then adding the sleep in vApplicationIdleHook should work just fine without a problem. Why not just use Tickless IDLE mode and let the RTOS take care of the sleep? All you need to do is set

#define configUSE_TICKLESS_IDLE 1

and leave vApplicationIdleHook function empty.

You will get better power optimization with this as compared to vApplicationIdleHook sleep, since in tickless modethe RTC tick interrupt is disabled until the expected wake time.

RE: sd_app_evt_wait cause uart not work.

tianbing357 — Thu, 09 May 2019 01:31:31 GMT

My needs are very simple, i trigger the data(100 byte) transfer in a cycle task , the cycle is 5s, implemented by a APP_TIMER (FreeRTOS), after i trigger the first byte data transfer, i want the chip go to sleep , and then i hope the uart can transfer the rest of bytes. also, in the sleep mode, i want the uart can receive data and notify the cpu to get the received data, not query the flag "NRF_UART0->EVENTS_RXDRDY" periodically. the "nrf_drv_uart" or UART FIFO can realize my needs?

RE: sd_app_evt_wait cause uart not work.

Susheel Nuguru — Wed, 08 May 2019 11:06:04 GMT

You made me read twice to see the function vApplicationIdleHook and figure out that you are using FreeRTOS.

Well the simple uart needs CPU to be awake to trigger send/receive as you are not using EasyDMA to push pop data from the UART FIFO to/from the RAM.

In which context are you transmitting data? when you make the chip go to sleep, are you expecting the data transfer to be triggered in some other interrupt context?