Project - G120 Clock Frequency and Peripheral Power Control

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1

I just posted G120 Clock Frequency and Peripheral Power Control on Codeshare. Feel free to discuss and make suggestions here.

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This is really cool stuff, and fundamental when a decent project needs to be really serious about power… I think.

I had a look through your code and its really heavy stuff to me. I am having a hard time understand the exact usage in my program.

If my code is finished doing all needed stuff, and wants to go into hibernate for say 1 hour, what is the procedure for shutting things down, and the procedure to get everything back to normal again - speeding up and turning on peripherhals…

In other words, can you provide a little bit more usage examples…

Thank you so much, looking forward to try this.

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This is how set the clock speed. I just do this once at the start of my code and leave it for the duration.

myPower = new cG120PowerModes();

cG120PowerModes.PLLClock CPUspeed = cG120PowerModes.PLLClock.clock120MHz;
myPower.setPLL0(CPUspeed);
cG120PowerModes.setPeripheralPowerStatesBase(0); //You can change what this means within the class.

int commSpeed = 9600 * 120 / ((int)CPUspeed); //This is how I calculate my adjusted UART bauds. Other time related stuff may also need to be adjusted.

I use the following to enter a ‘deep sleep’ hibernate. The Wake on RTC Alarm doesn’t seem to work for me, but I just use an interrupt pin from a push button or a second supervisory uC to trigger the wake.


cG120PowerModes.LCDEnable(false);   //Backlight must be turned off separately.

Register SCR = new Register(0xe000ed10);
Register PCON = new Register(0x400fC0C0);  //Power Mode Control 
PCON.Write(0x00000100);//Clear SMFLAG
PCON.Write(0x00000200);//Clear DSFLAG
PCON.Write(0x00000400);//Clear PDFLAG
SCR.SetBits(0x00000004); //SET DEEP SLEEP MODE  

Power.Hibernate(Power.WakeUpInterrupt.InterruptInputs);
//Code resumes here when woken

debugText = "SLEEP DEEP " + PCON.Read().ToString("X8");  //Defaults to 0x00000100 = SMFLAG=1//Should = 0x200 if SLEEPDEEP worked

DateTime DT = RealTimeClock.GetTime();
Utility.SetLocalTime(DT);  //Update system clock

cG120PowerModes.LCDEnable(true);

I am actively testing all this out at the moment and am still getting the odd bug where my code doesn’t restart correctly. At the moment I don’t know the cause. It definitely wakes from hibernate as I can toggle an LED when the CPU wakes, but it locks up with the LCD displaying ‘GHI’. Hopefully I will get this fixed soon.

Currently i’m not messing with the clock rates as part of the hibernate routine.

Also the built in Power.Hibernate() method is a bit of a black box to me. I have tried replacing it with a RLP routine that shuts the thing down while blocking other threads from running, but with no luck.

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Supergreat, thanks, will dive into this. Thank you so much, really great, will let you know how it goes.

Also, please keep us updated on your current project… :hand:

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Its time to wake this up again… :stuck_out_tongue: after the GHI.Premium libs has changed, did anyone port this piece?