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Discussion Title Created date
interrupt vectors
Guy, I need to disable interrupts before the device make the vector jump show below using, "cpsid if" instruction.    /* Exception vectors *******************/ ....
Tuesday, 27 August 2019 - 22:46
Disabling and Enabling Global Interrupts
Will the following two assembly commands work to disable and enable global Interrupts on the SAMA5D44?   asm("cpsie if"); asm("cpsid if");I know they work for the SAM 7...
Friday, 23 August 2019 - 22:56
Interrupts & Context switching
Hi guys, I'll describe the operation first then show you what I mean.     Before I enter the interrupt the system calls a function to prepare for the interrupt and clear...
Monday, 19 August 2019 - 19:15
USB Stack Development Setup
Hi freaks,   I'm looking to start to learn the USB protocol.  So first of all I've found USB sniffer programs, a bit like Winshark.  How would I go about connecting...
Wednesday, 14 August 2019 - 20:42
help with Bubble Sort
Guys, i'm working on a bubble sort and its only resulting in a semi sorted list.  Long file names are not being sorted properly.   for (l = 0; l < entry_nr; l...
Tuesday, 16 July 2019 - 14:49
ternary operator virginity
Why is this failing to compile?   (nr_entries1 > nr_entries2) ? nr_entries = nr_entries1 : nr_entries = nr_entries2; 
Sunday, 14 July 2019 - 17:08
allocating memory to an array of pointers doesn't work
Hi guys, what's wrong with this???   char * strings[10];; for(int i = 0; i < 10; i++) strings[i] = safe_malloc(255); 
Saturday, 13 July 2019 - 20:19
code never executed
Hi guys, I have a function and I set a value, "boundary_violation", but later when I test it, it never executes?  Have a look at the snapshot.  // locate number of...
Monday, 1 July 2019 - 17:48
this one is for clawson
clawson, when a directory entry occurs at the boundary of a cluster do you split the directory between the two clusters, or move on to the next cluster and not split the entry?
Saturday, 29 June 2019 - 02:08
USB
Hi guys, I'm preparing to start USB development.  Can I use the CDC class for things like keyboards and mass storage? I'm waiting on a book called "Embedded USB".  ...
Sunday, 23 June 2019 - 17:19
DMA MMC SD Cards
Just how fast is the DMA transfer between memory(array) and sd card?  I'm thinking of losing the need for buffers to hold the (data and directory) clusters and loading/saving...
Wednesday, 19 June 2019 - 01:04
Raspberry Pi
Guys, what the Raspberry Pi like for embedded stuff, not Linux development? It's extremely cheap at £35 with 1 Gig of DDR RAM?   I suspect there is lots of baremetal stuff on...
Tuesday, 18 June 2019 - 15:49

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