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Improve performance by putting more of the code and variables that are called by the DMA0 interrupt into IRAM (3% boost improvement on my test track).

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8404 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Brandon Low 2006-01-21 16:47:36 +00:00
parent 33914a7dfc
commit d8a6c0665d
2 changed files with 11 additions and 14 deletions
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19
apps/pcmbuf.c
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@ -46,8 +46,8 @@
static long pcmbuf_size = 0; /* Size of the PCM buffer. */ static long pcmbuf_size = 0; /* Size of the PCM buffer. */
static char *audiobuffer; static char *audiobuffer;
static long audiobuffer_pos; /* Current audio buffer write index. */ static long audiobuffer_pos; /* Current audio buffer write index. */
long audiobuffer_free; /* Amount of bytes left in the buffer. */ long audiobuffer_free IDATA_ATTR; /* Amount of bytes left in the buffer. */
static long audiobuffer_fillpos; /* Amount audiobuffer_pos will be increased. */ static long audiobuffer_fillpos; /* Amount audiobuffer_pos will be increased.*/
static char *guardbuf; static char *guardbuf;
static void (*pcmbuf_event_handler)(void); static void (*pcmbuf_event_handler)(void);
@ -81,11 +81,11 @@ struct pcmbufdesc
int size; int size;
/* Call this when the buffer has been played */ /* Call this when the buffer has been played */
void (*callback)(void); void (*callback)(void);
} pcmbuffers[NUM_PCM_BUFFERS]; } pcmbuffers[NUM_PCM_BUFFERS] IDATA_ATTR;
volatile int pcmbuf_read_index; volatile int pcmbuf_read_index;
volatile int pcmbuf_write_index; volatile int pcmbuf_write_index;
int pcmbuf_unplayed_bytes; int pcmbuf_unplayed_bytes IDATA_ATTR;
int pcmbuf_mix_used_bytes; int pcmbuf_mix_used_bytes;
int pcmbuf_watermark; int pcmbuf_watermark;
void (*pcmbuf_watermark_event)(int bytes_left); void (*pcmbuf_watermark_event)(int bytes_left);
@ -121,6 +121,7 @@ int pcmbuf_num_used_buffers(void)
return (pcmbuf_write_index - pcmbuf_read_index) & NUM_PCM_BUFFERS_MASK; return (pcmbuf_write_index - pcmbuf_read_index) & NUM_PCM_BUFFERS_MASK;
} }
static void pcmbuf_callback(unsigned char** start, long* size) ICODE_ATTR;
static void pcmbuf_callback(unsigned char** start, long* size) static void pcmbuf_callback(unsigned char** start, long* size)
{ {
struct pcmbufdesc *desc = &pcmbuffers[pcmbuf_read_index]; struct pcmbufdesc *desc = &pcmbuffers[pcmbuf_read_index];
@ -206,14 +207,10 @@ void pcmbuf_add_event(void (*event_handler)(void))
unsigned int pcmbuf_get_latency(void) unsigned int pcmbuf_get_latency(void)
{ {
int latency; int latency = (pcmbuf_unplayed_bytes + pcm_get_bytes_waiting())
* 1000 / 4 / 44100;
latency = (pcmbuf_unplayed_bytes + pcm_get_bytes_waiting()) return latency<0?0:latency;
* 1000 / 4 / 44100;
if (latency < 0)
latency = 0;
return latency;
} }
bool pcmbuf_is_lowdata(void) bool pcmbuf_is_lowdata(void)

6
firmware/pcm_playback.c
View file

@ -59,8 +59,8 @@ static bool pcm_playing;
static bool pcm_paused; static bool pcm_paused;
static int pcm_freq = 0x6; /* 44.1 is default */ static int pcm_freq = 0x6; /* 44.1 is default */
static unsigned char *next_start; static unsigned char *next_start IDATA_ATTR;
static long next_size; static long next_size IDATA_ATTR;
/* Set up the DMA transfer that kicks in when the audio FIFO gets empty */ /* Set up the DMA transfer that kicks in when the audio FIFO gets empty */
static void dma_start(const void *addr, long size) static void dma_start(const void *addr, long size)
@ -193,7 +193,7 @@ void pcm_set_frequency(unsigned int frequency)
} }
/* the registered callback function to ask for more mp3 data */ /* the registered callback function to ask for more mp3 data */
static void (*callback_for_more)(unsigned char**, long*) = NULL; static void (*callback_for_more)(unsigned char**, long*) IDATA_ATTR = NULL;
void pcm_play_data(void (*get_more)(unsigned char** start, long* size)) void pcm_play_data(void (*get_more)(unsigned char** start, long* size))
{ {