Posted on December 26, 2012 at 10:24I'm working on a project where power saving is a critical issue and I need some help with the power mode (sleep).
Here is a short description of the project structure:
Main goals:
Save an image form the camera each second to the SD card
Save value from ADC each second to the SD card
Save as much power as possible
After init, I have three interrupts and three tasks:
Interrupts:
Tick (timer) � for the OS (FreeRtos)
Call the xPortSysTickHandler
DMA transfer for the camera Clear ISR
Start camera task
ADC complete for the ADC Clear ISR
Start ADC task
Tasks:
Camera task Disable the DCMI
Set a flag to indicate that there is a new frame
ADC task Disable ADC
Set a flag to indicate that there is a new value
Background task Check the flags to find out if there is any data to save (flags from the two above tasks).
Is so, save to file and readable DCMI and ADC
Set a delay for the background task (vTaskDelay)
The go to sleep
This is how the background task looks like:
while(1)
{
//check for new data from the camera or ADC
Background_OP();
//set a small delay for this task
vTaskDelay(40);
//ZZZ...
__WFI();
}
}
Everything works fine but I'm not sure about the sleep mode.
Is this the way to use __WFI() function?
Is there a better way to handle power consumption?
#stm32-power-management #low-power
