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Flush DMA buffers for DMA

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11905 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Greg White 2007-01-04 11:36:25 +00:00
parent 6eb81e2dc8
commit dd7b75bd2c
1 changed files with 18 additions and 11 deletions
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29
firmware/target/arm/gigabeat/meg-fx/pcm-meg-fx.c
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@ -22,6 +22,7 @@
#include "audio.h"
#include "wm8975.h"
#include "file.h"
#include "mmu-meg-fx.h"
static int pcm_freq = HW_SAMPR_DEFAULT; /* 44.1 is default */
@ -48,11 +49,11 @@ void fiq(void)
SRCPND = (1<<19);
/* Buffer empty. Try to get more. */
if (pcm_callback_for_more)
if (pcm_callback_for_more)
{
pcm_callback_for_more((unsigned char**)&p, &p_size);
}
else
else
{
/* callback func is missing? */
pcm_play_dma_stop();
@ -61,19 +62,22 @@ void fiq(void)
if (p_size)
{
/* Flush any pending cache writes */
clean_dcache_range(p, p_size);
/* set the new DMA values */
DCON2 = DMA_CONTROL_SETUP | (p_size >> 1);
DISRC2 = (int)p + 0x30000000;
/* Re-Activate the channel */
DMASKTRIG2 = 0x2;
DMASKTRIG2 = 0x2;
}
else
{
/* No more DMA to do */
pcm_play_dma_stop();
}
}
@ -83,7 +87,7 @@ void pcm_init(void)
pcm_playing = false;
pcm_paused = false;
pcm_callback_for_more = NULL;
audiohw_init();
audiohw_enable_output(true);
audiohw_mute(true);
@ -117,23 +121,23 @@ void pcm_play_dma_start(const void *addr, size_t size)
/* Enable the IIS clock */
CLKCON |= (1<<17);
CLKCON |= (1<<17);
/* IIS interface setup and set to idle */
IISCON = (1<<5) | (1<<3);
/* slave, transmit mode, 16 bit samples - 384fs - use 16.9344Mhz */
/* slave, transmit mode, 16 bit samples - 384fs - use 16.9344Mhz */
IISMOD = (1<<9) | (1<<8) | (2<<6) | (1<<3) | (1<<2);
/* connect DMA to the FIFO and enable the FIFO */
IISFCON = (1<<15) | (1<<13);
/* set DMA dest */
DIDST2 = (int)&IISFIFO;
DIDST2 = (int)&IISFIFO;
/* IIS is on the APB bus, INT when TC reaches 0, fixed dest addr */
DIDSTC2 = 0x03;
/* How many transfers to make - we transfer half-word at a time = 2 bytes */
/* DMA control: CURR_TC int, single service mode, I2SSDO int, HW trig */
/* no auto-reload, half-word (16bit) */
@ -152,9 +156,12 @@ void pcm_play_dma_start(const void *addr, size_t size)
/* unmask the DMA interrupt */
INTMSK &= ~(1<<19);
/* Flush any pending writes */
clean_dcache_range(addr, size);
/* Activate the channel */
DMASKTRIG2 = 0x2;
/* turn off the idle */
IISCON &= ~(1<<3);
@ -185,7 +192,7 @@ void pcm_play_dma_stop(void)
IISCON &= ~(1<<0);
/* Disconnect the IIS IIS clock */
CLKCON &= ~(1<<17);
CLKCON &= ~(1<<17);
disable_fiq();