forked from len0rd/rockbox
Archos recorders: New recording data transfer routine. Not asm optimised this time, but it should lower the possibility of broken recordings a little.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6511 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold
parent
ac31e6af87
commit
ff3add9f20
1 changed files with 38 additions and 80 deletions
108
firmware/mpeg.c
108
firmware/mpeg.c
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@ -525,35 +525,16 @@ static unsigned long num_recorded_frames;
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static void drain_dma_buffer(void)
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static void drain_dma_buffer(void)
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{
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{
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asm (
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while (PBDRH & 0x40)
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"mov #0x40,r2 \n" /* mask for EOD check */
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{
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"bra .d_start \n"
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xor_b(0x08, &PADRH);
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"mov.b @%0,r1 \n" /* read PBDR (first time) */
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".d_loop: \n"
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while (PBDRH & 0x80);
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"xor.b #0x08,@(r0,gbr) \n" /* set PR active */
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".d_wait1: \n"
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"mov.b @%0,r1 \n" /* read PBDR */
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"cmp/pz r1 \n" /* and wait for PRTW */
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"bf .d_wait1 \n"
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"xor.b #0x08,@(r0,gbr) \n" /* reset PR to inactive */
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xor_b(0x08, &PADRH);
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".d_wait2: \n"
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"mov.b @%0,r1 \n" /* read PBDR */
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"cmp/pz r1 \n" /* and wait for /PRTW */
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"bt .d_wait2 \n"
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".d_start: \n"
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while (!(PBDRH & 0x80));
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"tst r1,r2 \n" /* EOD low? */
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}
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"bf .d_loop \n" /* no: next pass */
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: /* outputs */
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: /* inputs */
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/* %0 */ "r"(PBDR_ADDR),
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/* %1 = r0 */ "z"(&PADRH)
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: /* clobbers */
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"r1","r2"
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);
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}
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}
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void rec_tick (void) __attribute__ ((section (".icode")));
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void rec_tick (void) __attribute__ ((section (".icode")));
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@ -561,67 +542,44 @@ void rec_tick(void)
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{
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{
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int i;
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int i;
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int num_bytes;
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int num_bytes;
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if(is_recording && (PBDR & 0x4000))
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int delay;
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char data;
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if(is_recording && (PBDRH & 0x40))
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{
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{
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#ifdef DEBUG
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#ifdef DEBUG
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timing_info[timing_info_index++] = current_tick;
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timing_info[timing_info_index++] = current_tick;
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TCNT2 = 0;
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TCNT2 = 0;
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#endif /* #ifdef DEBUG */
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#endif /* #ifdef DEBUG */
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/* We read as long as EOD is high, but max 30 bytes. */
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i = 0;
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asm (
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while (PBDRH & 0x40) /* We try to read as long as EOD is high */
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"mov #30,r3 \n" /* i_max = 30 */
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{
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"mov #0x40,r2 \n" /* mask for EOD check */
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xor_b(0x08, &PADRH); /* Set PR active, independent of polarity */
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"mov #0,%0 \n" /* i = 0; */
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"add %2,%1 \n" /* audiobuf_write -> cur_addr */
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"add %2,%3 \n" /* audiobuflen -> end_addr */
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"bra .r_start \n"
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"mov.b @%4,r1 \n" /* read PBDR (first time) */
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".align 2 \n"
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delay = 0;
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while (PBDRH & 0x80) /* Wait until /RTW becomes active */
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{
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delay++;
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if (delay > 100) /* Bail out if we have to wait too long */
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{ /* i.e. the MAS doesn't want to talk to us */
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xor_b(0x08, &PADRH); /* Set PR inactive */
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goto transfer_end; /* and get out of here */
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}
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}
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".r_loop: \n"
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data = *(unsigned char *)0x04000000; /* read data byte */
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"xor.b #0x08,@(r0,gbr) \n" /* set PR active */
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".r_wait1: \n"
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"mov.b @%4,r1 \n" /* read PBDR */
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"cmp/pz r1 \n" /* and wait for PRTW */
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"bf .r_wait1 \n"
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"mov.b @%6,r1 \n" /* read byte from mas */
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xor_b(0x08, &PADRH); /* Set PR inactive */
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"add #1,%0 \n" /* i++; */
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"mov.b r1,@%1 \n" /* store byte */
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"add #1,%1 \n" /* increment current address */
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"cmp/hi %1,%3 \n" /* end address reached? */
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audiobuf[audiobuf_write++] = data;
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"bt .r_nowrap \n" /* no: do nothing */
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"mov %2,%1 \n" /* yes: reset to start address */
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".r_nowrap: \n"
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"xor.b #0x08,@(r0,gbr) \n" /* set PR inactive again */
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if (audiobuf_write >= audiobuflen)
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".r_wait2: \n"
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audiobuf_write = 0;
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"mov.b @%4,r1 \n" /* read PBDR */
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"cmp/pz r1 \n" /* and wait for /PRTW */
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"bt .r_wait2 \n"
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".r_start: \n"
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i++;
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"tst r2,r1 \n" /* EOD low? */
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}
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"bt .r_end \n" /* yes: end of transfer */
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transfer_end:
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"cmp/hi %0,r3 \n" /* i < i_max? */
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"bt .r_loop \n" /* yes: next pass */
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".r_end: \n"
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"sub %2,%1 \n" /* cur_addr -> audiobuf_write */
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: /* outputs */
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/* %0 */ "=&r"(i),
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/* %1, in & out */ "+r"(audiobuf_write)
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: /* inputs */
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/* %2 */ "r"(audiobuf),
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/* %3 */ "r"(audiobuflen),
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/* %4 */ "r"(PBDR_ADDR),
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/* %5 = r0 */ "z"(&PADRH),
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/* %6 */ "r"(0x4000000)
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: /* clobbers */
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"r1","r2","r3"
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);
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#ifdef DEBUG
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#ifdef DEBUG
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timing_info[timing_info_index++] = TCNT2 + (i << 16);
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timing_info[timing_info_index++] = TCNT2 + (i << 16);
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timing_info_index &= 0x3ff;
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timing_info_index &= 0x3ff;
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