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Bug fixes and comments in audio recording demo

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This commit is contained in:
inmarket 2014-03-24 10:08:51 +10:00
parent c354639f7b
commit 9919aeac89
2 changed files with 11 additions and 6 deletions
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4
demos/modules/gaudio/oscilloscope/gwinosc.c
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@ -144,10 +144,10 @@ void gwinScopeWaitForTrace(GHandle gh) {
scopemin = 0;
#endif
for(i = paud->len/(gfxSampleFormatBits(gs->format)/8); i; i--) {
for(i = paud->len/((gfxSampleFormatBits(gs->format)+7)/8); i; i--) {
/* Calculate the new scope value - re-scale using simple shifts for efficiency, re-center and y-invert */
if (gs->format <= 8)
if (gfxSampleFormatBits(gs->format) <= 8)
y = yoffset - (((coord_t)(*pa8++ ) << shr) >> (16-SCOPE_Y_BITS));
else
y = yoffset - (((coord_t)(*pa16++) << shr) >> (16-SCOPE_Y_BITS));

13
demos/modules/gaudio/oscilloscope/main.c
View File

@ -55,10 +55,15 @@ int main(void) {
gfxInit();
// Allocate audio buffers - 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 audio buffers - 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.
* 16 x 256 seems to work on the really slow Olimex SAM7EX256 board (display speed limitation) @8kHz
* If your oscilloscope display stops then it is likely that your driver has stalled due to running
* out of free buffers. Increase the number of buffers..
*/
gfxBufferAlloc(16, 256);
/* Get the screen dimensions */
swidth = gdispGetWidth();