LAUNCHXL-CC1312R1: How to achieve low power when CC1312R connected with MSP430.

I would use energyTrace on a Launchpad to measure the current consumption vs time. Most likely you have written the code in a way that blocks one or both of the chips from going in sleep. 

Without knowing which chip that has the increased power consumption or without knowing how your code it's impossible to know where you need to change the code. Also, how do both chips know when you intend to send/ receive data? If you don't have any time sync, the RX side has to be on all the time. 

Hi TheGhostOf

Thanks for the reply, i used sip32431 to switch the MSP430fr2433 before cc1312R entering to the Sleep(), i have attached my full testing code for your validation please check and point out the mistakes that i made... 

 rfPacketTx_CC1312R1_tirtos7_gcc.rar

Regards

Surya

surya said:

i used sip32431 to switch the MSP430fr2433 before cc1312R entering to the Sleep()

It sound like you also are doing somethings in HW, do you have a block diagram or schematic of your setup? 

Hi TheGhostOf

Thanks for the rapid fast response... i have attached my Mosfet schematic for your evaluation i just connect the enable pin to CC1312 red LED pin to control the MSP430 VCC because MSP430 VCC is connected with MOSFET output pin, GND is shorted with cc1312, Mosfet and MSP430..

CC1312R- DIO25 TX to MSP P2.5 RX

CC1312R- DIO26 RX to MSP P2.6 TX

GND   to GND

CC1312 R RED LED pin to MOSFET Enable pin

3.3V connect with CC1312 VCC and MOSFET VCC

MSP VCC to MOSFET OUT

MOSFET GND to GND

i hope the above details is enough for your validation...

regards

Surya

Hi surya,

Have you tried using the Task_sleep() method, instead of sleep?  You have to include #include <ti/sysbios/knl/Task.h>

This should cause TI-RTOS7 to go to sleep immediately.

Regards,

Arthur

Hi Arthur R☑️

No, i just started to program with Ti RTOS recently so please guide me on how to add Task_sleep() method in RF Packet tx/rx example, where i can found system ticks value... to convert ms or seconds...

regards

Surya

Hi surya,

First, start by using the tirtos7 version of the RF packet TX/RX example.

Then, include the #include <ti/sysbios/knl/Task.h> header.

From there, using the tick value shown in your SysConfig file:

You can calculate the necessary tick value. You can also use the sleep() method, which is based on Task_sleep().

sleep however requires an argument in seconds.

Regards,

Arthur

And usleep() if you want the argument in us? 

Hi Arthur R☑️

Thanks for the detailed explanation, yes i have used the sleep() function packet interval during this interval my Launchpad consumes less than 1uA but if i add a UART callback example with MSP430FR2433 with LPM mode it consumes more than 300uA during sleep mode(MSP430FR2433 consumes 1uA without connecting CC1312R launchpad...).. please let me know how to reduce the power to a minimum...

Please let us know how to break the semaphore wait() after some time interval like how to implement SemaphorePend() to uart callback example...

regards

Surya

Hi surya,

You can refer to the TI-RTOS documenation: https://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/bios/sysbios/6_41_04_54/exports/bios_6_41_04_54/docs/cdoc/ti/sysbios/knl/Semaphore.html#pend

It states that you can add a timeout value to that call, so that it breaks after a given time.

Can you share with us your Sysconfig file, or any other GPIO configuration you might have done?

Regards,

Arthur

Hi Arthur R☑️

 Sorry for the delayed response, I have shared my sys config file for your validation please check and point out the problem.

7142.rfPacketTx.rar

regards

Surya

Hi Surya,

The reason I am asking is that there might be leakage current accross the UART pins of your respective devices. Can you measure the current consumption of each device separately?

Regards,

Arthur

Hi Arthur R☑️

Yes you are correct, i have tested the devices on two different types

1. cut off the CC1312R/cc1352R power supply through MOSFET that time total cosumption greater than 10mA,

2. without MOSFET (MSP430 and CC1312) always connected with power and MSP enter to LPM and CC1312R enter to sleep(uart disbled) now power consumption is 300uA, 

3. Stanalone  with LPM mode MSP430 consumes only <1uA, CC1312 callback without semaphore then enter to sleep it consumes 8mA problem is i can't disable the UART because i has used uartread() function, 

4. how to implement the UART2_readTimeout() to avoid the above problem, here timeout is sec or systemticks, 

regards

Surya