Acheiving Low Power
Posted: Thu Mar 16, 2017 11:12 am
Just looking for suggestions has to if i've missed anything when entering sleep mode with evt wakeup.
Current consumption of MCU is still around 2-3mA which cannot be right......Datasheet suggests around 500uA when HSI is 16Mhz with PLL off and Peripherals disabled.
Heres the console code that puts it to sleep.
Current consumption of MCU is still around 2-3mA which cannot be right......Datasheet suggests around 500uA when HSI is 16Mhz with PLL off and Peripherals disabled.
Heres the console code that puts it to sleep.
Code: Select all
static void cmd_sleep(BaseSequentialStream *chp, int argc, char *argv[]) {
int i;
char cmd[20];
msg_t result;
char *response;
(void)argv;
if (argc > 0)
{
if (strstr(argv[0], "zzz") != NULL)
{
/* Switch off the gsm modem */
result = modemTakeAccess(MS2ST( 20000 ));
if( result != MSG_OK )
{
chprintf(chp, "gsm access err\r\n");
return;
}
else
{
chsnprintf(cmd, sizeof(cmd),
"%s\r", "at+qpowd=0;");
response = modemExecCommand(cmd, 3 );
if( strstr( response, "OK" ) != NULL )
{
chprintf(chp, "gsm powered off\r\n");
/* Disable the power to the gnss */
palSetPad( GPIOE, GPIOE_GNSS_PWR );
chprintf(chp, "gnss powered off\r\n");
/* Configure exti to events mode */
extiConfigLowPowerMode();
chprintf( chp, "setup exti event\r\n" );
/* Set alarm to wakup in 60 seconds */
clkAlarmSet( ALMMUL_SEC, 60 );
chprintf( chp, "alarm wakeup 60s\r\n" );
chThdSleepMilliseconds(1000);
chprintf(chp, "Entering sleep zzz \r\n");
chThdSleepMilliseconds(1000);
/* Set all I/O pins to Analog inputs */
for( i = 0; i < 16; i++ )
{
palSetPadMode( GPIOA, i,
PAL_MODE_INPUT_ANALOG );
palSetPadMode( GPIOB, i,
PAL_MODE_INPUT_ANALOG );
palSetPadMode( GPIOC, i,
PAL_MODE_INPUT_ANALOG );
palSetPadMode( GPIOD, i,
PAL_MODE_INPUT_ANALOG );
palSetPadMode( GPIOE, i,
PAL_MODE_INPUT_ANALOG );
palSetPadMode( GPIOH, ( i % 2 ),
PAL_MODE_INPUT_ANALOG );
}
/* disable clock sources on the buses */
RCC->AHB2ENR &= ~( RCC_AHB2ENR_OTGFSEN );
RCC->APB1ENR &= ~( RCC_APB1ENR_TIM2EN | \
RCC_APB1ENR_TIM3EN | \
RCC_APB1ENR_TIM4EN | \
RCC_APB1ENR_TIM5EN | \
RCC_APB1ENR_WWDGEN | \
RCC_APB1ENR_SPI2EN | \
RCC_APB1ENR_SPI3EN | \
RCC_APB1ENR_I2C1EN | \
RCC_APB1ENR_I2C2EN | \
RCC_APB1ENR_I2C3EN | \
RCC_APB1ENR_USART2EN );
RCC->AHB1ENR &= ~( RCC_AHB1ENR_DMA1EN | \
RCC_AHB1ENR_DMA2EN | \
RCC_AHB1ENR_GPIOAEN | \
RCC_AHB1ENR_GPIOBEN | \
RCC_AHB1ENR_GPIOCEN | \
RCC_AHB1ENR_GPIODEN | \
RCC_AHB1ENR_GPIOEEN | \
RCC_AHB1ENR_GPIOHEN );
RCC->APB2ENR &= ~( RCC_APB2ENR_TIM1EN | \
RCC_APB2ENR_ADC1EN | \
RCC_APB2ENR_SDIOEN | \
RCC_APB2ENR_SPI1EN | \
RCC_APB2ENR_SPI4EN | \
RCC_APB2ENR_SPI5EN | \
RCC_APB2ENR_TIM9EN | \
RCC_APB2ENR_TIM10EN | \
RCC_APB2ENR_TIM11EN | \
RCC_APB2ENR_SYSCFGEN | \
RCC_APB2ENR_USART1EN | \
RCC_APB2ENR_USART6EN );
/* swtich clock source to HSI as we need
* to disable the phase locked loop */
/* Enable HSI clock */
RCC->CR |= RCC_CR_HSION;
/* Wait for HSI is ready */
while (!(RCC->CR & RCC_CR_HSIRDY));
/* Select HSI clock as main clock */
RCC->CFGR &= ~( RCC_CFGR_SW );
RCC->CFGR |= RCC_CFGR_SW_HSI;
/* Disable PLL clock */
RCC->CR &= ~RCC_CR_PLLON;
/* start teh process of entering sleep
* mode. On exit we do system reset */
/* clear PDDS bit safety */
PWR->CR &= ~( PWR_CR_PDDS );
/* set LPDS, clear flags */
PWR->CR |= ( PWR_CR_LPDS | \
PWR_CR_CSBF | \
PWR_CR_CWUF | \
PWR_CR_FPDS );
/* set the deep sleep mask */
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
chSysLock();
__SEV();
__WFE();
__WFE();
chSysUnlock();
/* clear the deep sleep mask */
SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
/* reset the system to restart */
__ASM volatile ("dsb");
/* Keep priority group unchanged */
SCB->AIRCR = ((0x5FA << SCB_AIRCR_VECTKEY_Pos) | \
(SCB->AIRCR & SCB_AIRCR_PRIGROUP_Msk) | \
SCB_AIRCR_SYSRESETREQ_Msk);
__ASM volatile ("dsb");
return;
}
else
{
chprintf(chp, "modem command err\r\n");
}
modemGiveAccess();
}
return;
}
}
}
