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Wake up MCU with GDO0 when packet received

Joris Lambrecht
Intellectual 290 points
Other Parts Discussed in Thread: TMS320F28335, CC1101

I want to allow my MCU (TMS320F28335) to go into standby mode if the CC1101 hasn't received a packet in a while and then wake up as soon as the CC1101 receives a packet in order to process it.  I have GDO0 configured (IOCFG0 = 06) such that the pin goes high when the sync word is sent/received and low at the end of the packet.

I can configure my MCU to wakeup from standby by configuring GPIOLPMSEL to wake up when a specified pin is pulled low.  If GDO0 was by default high and dropped to low and back to high when receiving a packet, I would think that this would work perfectly.  Can I just put a NOT Gate on the GDO0 pin and connect the output to one of my other GPIO pins on MCU and configure that GPIO as the wakeup pin?

Any suggestions on a a chip to do this as simply as possible?  I will have two inputs that need to be inverted.

  • 0
    TI__Genius 12480 points

    Joris,

    There is an even easier solution for you! Each of the GDOx registers contain a bit (INV) which is used to invert the signal, see page 71 in the CC1101 Data Sheet. Please note that If the IOCFGx.GDOx_CFG setting is less than 0x20 (which is the case for you,s ince you are using 0x06) and  IOCFGx_GDOx_INV is  0 (1), the GDO0 and GDO2 pins will be hardwired to 0 (1), and the GDO1 pin will be hardwired to 1 (0) in the SLEEP state. These signals will be hardwired until the  CHIP_RDYn signal goes low. 

    -Jonas

  • 0 in reply to Firefighter
    Intellectual 290 points

    Jonas,

    Will try this out!  Thanks for the advice.

    -Joris