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1  Using Arduino / Displays / Nokia 5110 faded on: March 18, 2013, 06:08:57 am
Hi, I have made a prototype using a Nokia 5110 LCD and an ATMEGA328P. The display is powered at 3.3V as well as the ATMEGA328P used on this project, and they are directly connected (no resistences between them, since both use the same power supply). I have used Adafruit library, and also this library: http://code.google.com/p/pcd8544. I had some contrast problems (there was a significant black tint all over, that make it difficult to see the text printed on the LCD), I made some tweaks on the LCD initialization and ended up using the command with the value 0xA8 to configure Vop, instead of the default 0xC2 of the library. This worked ok (for some minutes), then I turned off the unit, when I turned it on again the display was very dim, and after another power down / power up I've never managed to get any image on the display, not even with the original values, and with both libraries, using the included examples, that worked previously (with some blackish tint as I said before). It seems that the display is dead. Is there any possibility of killing the display by setting different parameters for Vop? Any idea of what could be the reason for this?

Thanks in advance

Fernando
2  Development / Other Software Development / Re: ChibiOS/RT 2.4.0 RTOS update on: March 13, 2012, 07:34:05 pm
Hi

Thanks for your effort porting to ChibiOS, I was searching for something similar, because programming without an RTOS sometimes is not easy (and i don't want to start one more discussion about bare metal programming vs RTOS, it just depends on the complexity, even for such a limited device there is space for a RTOS in my opinion, usefull for some types of requirements). The problem I face in your porting is how to use it. i'm not familiar with ChibiOS, can you give some tips on how to use your port? From what I saw in the readme you are integrating it in the Arduino environment, so the IDE will still be the Arduino even using the ChibiOS (something like the DuinOS)? Does it work with the Arduino 022? or with 1.0? And the diferent folders, I didn't understand well what to change between the supplied folders and the original files from the chibiOS. If you can give some tips on how to do it it will be great!

Best regards

Fernando
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