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| author | Linus Nielsen Feltzing <linus@haxx.se> | 2002-11-21 21:38:58 +0000 |
|---|---|---|
| committer | Linus Nielsen Feltzing <linus@haxx.se> | 2002-11-21 21:38:58 +0000 |
| commit | 6871977d821ed7487f91b520e39f655f5d61dc1f (patch) | |
| tree | a2268f29af982d1057d594a35d00c4a4d58d459a | |
| parent | 390e8f0ec6f1093170e4a51268dfab58d90b730e (diff) | |
| download | rockbox-6871977d821ed7487f91b520e39f655f5d61dc1f.zip rockbox-6871977d821ed7487f91b520e39f655f5d61dc1f.tar.gz rockbox-6871977d821ed7487f91b520e39f655f5d61dc1f.tar.bz2 rockbox-6871977d821ed7487f91b520e39f655f5d61dc1f.tar.xz | |
Optimized recording interrupt
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2873 a1c6a512-1295-4272-9138-f99709370657
| -rw-r--r-- | firmware/mpeg.c | 52 |
1 files changed, 31 insertions, 21 deletions
diff --git a/firmware/mpeg.c b/firmware/mpeg.c index c5f036c..ce348f4 100644 --- a/firmware/mpeg.c +++ b/firmware/mpeg.c @@ -647,42 +647,52 @@ static void dma_tick(void) else { int i; - int num_bytes = 0; + int num_bytes; if(is_recording && (PBDR & 0x4000)) { #ifdef DEBUG timing_info[timing_info_index++] = current_tick; TCNT2 = 0; #endif - for(i = 0;i < 30 && (PBDR & 0x4000);i++) + if(inverted_pr) { - if(inverted_pr) + for(i = 0;PBDR & 0x4000;i++) + { PADR |= 0x800; - else + + /* It must take at least 5 cycles before + the data is read */ + mp3buf[mp3buf_write++] = *(unsigned char *)0x4000000; + PADR &= ~0x800; - - /* It must take at least 5 cycles before the data is read */ - mp3buf[mp3buf_write] = *(unsigned char *)0x4000000; - - if(inverted_pr) + + if(mp3buf_write >= mp3buflen) + mp3buf_write = 0; + } + } + else + { + for(i = 0;PBDR & 0x4000;i++) + { PADR &= ~0x800; - else + + /* It must take at least 5 cycles before + the data is read */ + mp3buf[mp3buf_write++] = *(unsigned char *)0x4000000; + PADR |= 0x800; - - /* It must take at least 4 cycles before the next loop */ - num_rec_bytes++; - - mp3buf_write++; - if(mp3buf_write >= mp3buflen) - mp3buf_write = 0; - - num_bytes++; + + if(mp3buf_write >= mp3buflen) + mp3buf_write = 0; + } } #ifdef DEBUG - timing_info[timing_info_index++] = TCNT2 + (num_bytes << 16); + timing_info[timing_info_index++] = TCNT2 + (i << 16); timing_info_index &= 0x3ff; #endif + num_rec_bytes += i; + /* Signal to save the data if we are running out of buffer space */ num_bytes = mp3buf_write - mp3buf_read; @@ -1626,7 +1636,7 @@ static void mpeg_thread(void) close(mpeg_file); mpeg_file = -1; -#if 0 +#ifdef DEBUG { int i; for(i = 0;i < 512;i++) |