int
sol_platform_impl_get_state(void)
{
switch (lpm_get()) {
case LPM_POWERDOWN:
case LPM_SLEEP:
return SOL_PLATFORM_STATE_STOPPING;
case LPM_UNKNOWN:
return SOL_PLATFORM_STATE_UNKNOWN;
default:
return SOL_PLATFORM_STATE_RUNNING;
}
}
/* Change the current power-saving mode. */
enum lpm_mode lpm_set(enum lpm_mode target)
{
enum lpm_mode last_mode = lpm_get();
switch (target)
{
case LPM_ON:
// fully running MCU
__bic_status_register(CPUOFF | OSCOFF | SCG0 | SCG1);
break;
case LPM_IDLE:
// lightest mode => LPM0 mode of MSP430
__bic_status_register(OSCOFF | SCG0 | SCG1);
// only stops CPU block
__bis_status_register(CPUOFF);
break;
case LPM_SLEEP:
// mid-level mode => LPM1 mode of MSP430
__bic_status_register(OSCOFF | SCG1);
// stops CPU and master clock blocks
__bis_status_register(CPUOFF | SCG0);
break;
case LPM_POWERDOWN:
// deep-level mode => LPM3 mode of MSP430
__bic_status_register(OSCOFF);
// stops all blocks except auxiliary clock (timers)
__bis_status_register(CPUOFF | SCG0 | SCG1);
break;
case LPM_OFF:
// MCU totally down (LPM4), only RESET or NMI can resume execution
__bis_status_register(CPUOFF | OSCOFF | SCG0 | SCG1); // all blocks off
break;
default:
printf("ERROR: trying to set an invalid low-power mode!\n");
printf(" Operation aborted.\n\n");
}
return last_mode;
}
