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Strange error in stddef.h
My project has started refusing to compile, it is moaning about a line in stddef.h, which, as far as I know, I haven't altered in any way. I have undone all the recent additions...
Wednesday, 2 April 2014 - 20:03
Using DACC with DMA (SAM4)
Is it possible to use the SAM4 DMA(PDC) to read data from Flash and squirt it out through the DACC? Failing that, I assume that it's possible to pull the data from RAM and send it...
Sunday, 23 March 2014 - 13:52
SAM4S16C instruction times
I'm in the process of re-writing TFT drivers for a SAM4S16C project. I was using SPI for early testing, but now I have 18 bit parallel access. Naturally I want to squeeze the last...
Monday, 17 March 2014 - 18:23
Assembler files under AS6.x
Under WinAVR, stand-alone assembler files, as I recall, had to be.S (upper case). If I ask to add a new item in the form of an assembler file to my SAM4 project under AS6.1, it...
Saturday, 8 March 2014 - 10:21
Saturating intrinsics, anyone?
Anyone know if it's possible to use the ARM C language extensions for saturation under AS6.1? I'm hoping to use the x = __usat(x, 8); sort of thing to keep rgb values in...
Friday, 7 March 2014 - 12:59
SAM4 bootloader - good progress, but a couple of Qs
I do no want to be guilty of inter forum cross-posting, so here's a link to the post I just made in the AT91 forum. http://www.at91.com/forum/viewtopic.php/f,29/t,22140/p,40616/#...
Saturday, 18 January 2014 - 11:08
Writing to Flash for SAM4S
Does anyone have any experience of this? I can't make head or tail of the documentation. In particular, I don't understand where the "internal latch buffer" is, or how to access...
Saturday, 11 January 2014 - 10:46
Bootloader support for SAM4S16C
I need to write a bootloader for the SAM4S16C. I know it has a built-in SAM BA in ROM, but, as far as I can tell, there is no timeout mechanism, so in the event that the GPNVM bit...
Wednesday, 8 January 2014 - 20:18
Where files should go in AS6.1(so Visual Studio question?)
I am unsure as to how to organize files in AS6.1 If I just lump everything into the scr folder it works, but I would rather separate things into folders. However, if I add .c...
Tuesday, 24 December 2013 - 11:53
RE: How can i creat flash table in C?
Quote: the avr-gcc compiler chooses to implement "__flash" and no special pgm() accessor functions are required any more. When did this happen? I feel so out of date now!...
Thursday, 19 December 2013 - 09:13
Redirect printf on SAM4(asf)
Anyone have any ideas how I can redirect printf stdout to my TFT print function? The AVR methods that I have used for XMega etc. don't seem to exist.
Friday, 13 December 2013 - 11:47
Using assembler for SAM4
Inevitably, I will want to explore the use of assembler on the SAM4. Is there any information about register usage for arguments/return values etc? This is well-documented for...
Tuesday, 3 December 2013 - 09:16

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