MSP430F5335: Wake up from any LPM

Silver Diamond

Part Number: MSP430F5335

If I have a conditional go to sleep code like this:

if (cell_pwr() || g_debug_bps > 9600) {
    __bis_SR_register(LPM1_bits + GIE);  // Go to sleep
} else {
    __bis_SR_register(LPM2_bits + GIE);  // Go to sleep
}

can I wake up using the code below, considering that sometimes the uC will be in LPM1 and the ISR will attempt to wake it up from LPM2?

__bic_SR_register_on_exit(LPM2_bits);  // wake up

over 7 years ago

0 Britta Ruelander over 7 years ago

TI__Genius 10860 points

Hi,

LPM1_bits and LPM2_bits actually modify different bits.

__bic_SR_register(LPM2_bits);

doesn't actually modify the same bit in the status register as

__bic_SR_register(LPM1_bits);

You can review the modified bits if you look at the header files used in your code.

However, maybe you can use flags to indicate which condition applies so that you can also conditionally wake up from the according LPM.

Best regards,

Britta

0 Silver Diamond over 7 years ago in reply to Britta Ruelander

Genius 4010 points

Wow, I just needed to conditionally go to LPM 1 or 3 mode, then it all works.

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MSP430F5335: Wake up from any LPM