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authorinmarket <andrewh@inmarket.com.au>2014-03-24 10:08:15 +1000
committerinmarket <andrewh@inmarket.com.au>2014-03-24 10:08:15 +1000
commitc354639f7b8ab1c33866b3d57a243de95a75decc (patch)
tree74db3a736e6839de1ef49b1df719c5d92e0189b7 /demos/modules
parentc7566aa5531b35a84f06940966f31acadfc85ade (diff)
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Update GADC
Diffstat (limited to 'demos/modules')
-rw-r--r--demos/modules/gadc/main.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/demos/modules/gadc/main.c b/demos/modules/gadc/main.c
index 8e5ecaa4..67eed456 100644
--- a/demos/modules/gadc/main.c
+++ b/demos/modules/gadc/main.c
@@ -167,10 +167,19 @@ int main(void) {
gtimerStart(&lsTimer, LowSpeedTimer, ghText, TRUE, MY_LS_DELAY);
#endif
- // Allocate buffers for the high speed GADC device - 4 x 128 byte buffers.
- // You may need to increase this for slower cpu's.
- // You may be able to decrease this for low latency operating systems.
- gfxBufferAlloc(4, 128);
+ /**
+ * Allocate buffers for the high speed GADC device - eg. 4 x 128 byte buffers.
+ * You may need to increase this for slower cpu's.
+ * You may be able to decrease this for low latency operating systems.
+ * 10 x 128 seems to work on the really slow Olimex SAM7EX256 board (display speed limitation)
+ * If your oscilloscope display stops but the low speed reading keep going then it is likely that
+ * your high speed timer has stalled due to running out of free buffers. Increase the number
+ * of buffers..
+ * If you make the buffers too large with a slow sample rate you may not allow enough time for all
+ * the low speed items to occur in which case your memory will fill up with low speed requests until
+ * you run out of memory.
+ */
+ gfxBufferAlloc(10, 128);
/* Set up the scope window in the top right on the screen */
{