Comments on: Introducing the AVR HV Rescue Shield http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/ Join the resistance. Sun, 14 Mar 2010 16:31:25 -0700 http://wordpress.org/?v=2.9.2 hourly 1 By: Jeremy http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-5725 Jeremy Fri, 22 Jan 2010 21:20:22 +0000 http://mightyohm.com/blog/?p=1419#comment-5725 Very good, thanks for the reply! Very good, thanks for the reply!

]]> By: Jeff http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-5710 Jeff Sun, 17 Jan 2010 18:52:16 +0000 http://mightyohm.com/blog/?p=1419#comment-5710 The node connected to T1/R2 goes to !RESET (pin 1). Regarding the other pins, I recommend downloading the datasheets for the ATmega16 as well as the 48/88/168 and taking a close look at the section on "Memory Programming". Everything you need to know is pretty clearly outlined there. I would also look at the Arduino sketch for the HV programmer, the comments should be very helpful in understanding how the program (and the circuit) works. The node connected to T1/R2 goes to !RESET (pin 1).

Regarding the other pins, I recommend downloading the datasheets for the ATmega16 as well as the 48/88/168 and taking a close look at the section on “Memory Programming”. Everything you need to know is pretty clearly outlined there.

I would also look at the Arduino sketch for the HV programmer, the comments should be very helpful in understanding how the program (and the circuit) works.

]]> By: Jeremy http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-5703 Jeremy Fri, 15 Jan 2010 16:46:51 +0000 http://mightyohm.com/blog/?p=1419#comment-5703 Hi Jeff, I wondered if you might answer a couple more questions I have concerning the atmega16. First, I am in the process of designing a shield using the schematic you posted for your first shield. I am not sure which of the functions you are accessing on several of the pins. The first one I had a question on was the trace that comes from between T1 and R2. Does it go to the Reset pin on the Atmega16 or PC6? Secondly on all of the other pins, are you using the PBx,PCx and PDx or are you using the other functions of those pins. The reason I ask is that the secondary functions are different on the Atmega16 than the Mega48/88/168. Thanks for your help thus far!!! Jeremy Hi Jeff,

I wondered if you might answer a couple more questions I have concerning the atmega16.

First, I am in the process of designing a shield using the schematic you posted for your first shield. I am not sure which of the functions you are accessing on several of the pins. The first one I had a question on was the trace that comes from between T1 and R2. Does it go to the Reset pin on the Atmega16 or PC6?

Secondly on all of the other pins, are you using the PBx,PCx and PDx or are you using the other functions of those pins. The reason I ask is that the secondary functions are different on the Atmega16 than the Mega48/88/168.

Thanks for your help thus far!!!
Jeremy

]]> By: Jeremy http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-5684 Jeremy Tue, 12 Jan 2010 11:57:40 +0000 http://mightyohm.com/blog/?p=1419#comment-5684 OK, Thanks Jeff. I will give it a go and let you know what I find out. OK, Thanks Jeff. I will give it a go and let you know what I find out.

]]> By: Jeff http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-5683 Jeff Tue, 12 Jan 2010 05:31:35 +0000 http://mightyohm.com/blog/?p=1419#comment-5683 Jeremy, Based on the ATmega16 datasheet, that should work, but I haven't tested it. There is a slight chance that some very minor tweaks to the Arduino sketch might be needed. I would say there is a reasonable chance that it will "just work" once you get the pins wired correctly. Jeremy,

Based on the ATmega16 datasheet, that should work, but I haven’t tested it. There is a slight chance that some very minor tweaks to the Arduino sketch might be needed. I would say there is a reasonable chance that it will “just work” once you get the pins wired correctly.

]]> By: Jeremy http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-5679 Jeremy Mon, 11 Jan 2010 22:19:18 +0000 http://mightyohm.com/blog/?p=1419#comment-5679 Hi, I was wondering id the arduino programming would work for an atmega16 if I was to make my own protoboard? Thanks for any advice. Thanks Jeremy Hi, I was wondering id the arduino programming would work for an atmega16 if I was to make my own protoboard? Thanks for any advice.

Thanks
Jeremy

]]> By: Jeff http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-3551 Jeff Tue, 24 Mar 2009 15:53:48 +0000 http://mightyohm.com/blog/?p=1419#comment-3551 The lower pincount ATtiny's use a high voltage serial programming mode. There isn't any reason why this couldn't be implemented, I just ran out of board space for a socket. The lower pincount ATtiny’s use a high voltage serial programming mode. There isn’t any reason why this couldn’t be implemented, I just ran out of board space for a socket.

]]> By: Matt http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-3544 Matt Tue, 24 Mar 2009 12:06:48 +0000 http://mightyohm.com/blog/?p=1419#comment-3544 I wonder how much effort it would take to get this to work with the AT85 and AT45 as those often intentional program that fuse to get the extra IO and it would be nice to reset them to start from scratch. I wonder how much effort it would take to get this to work with the AT85 and AT45 as those often intentional program that fuse to get the extra IO and it would be nice to reset them to start from scratch.

]]> By: AVR HV rescue shield - Hack a Day http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-3458 AVR HV rescue shield - Hack a Day Mon, 16 Mar 2009 23:47:20 +0000 http://mightyohm.com/blog/?p=1419#comment-3458 [...] much makes the chip useless in most cases. [Jeff] didn’t want to give up on it though, so he built a system to program it using the rarely used high voltage parallel programming mode. He used an Arduino, a few lines of code and a few spare parts to make it. After sharing the idea [...] [...] much makes the chip useless in most cases. [Jeff] didn’t want to give up on it though, so he built a system to program it using the rarely used high voltage parallel programming mode. He used an Arduino, a few lines of code and a few spare parts to make it. After sharing the idea [...]

]]> By: Jeff http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-3433 Jeff Sat, 14 Mar 2009 06:07:44 +0000 http://mightyohm.com/blog/?p=1419#comment-3433 Thanks! :-) Thanks! :-)

]]> By: tim http://mightyohm.com/blog/2009/03/introducing-the-avr-hv-rescue-shield/comment-page-1/#comment-3427 tim Sat, 14 Mar 2009 00:53:42 +0000 http://mightyohm.com/blog/?p=1419#comment-3427 Nice work! Nice work!

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