devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

Added left/right/deemphasis functionality of dac_volume

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1227 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2002-06-27 08:28:51 +00:00
parent e24a897de4
commit a8f141978d
2 changed files with 9 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

13
firmware/drivers/dac.c
View file

@ -16,23 +16,26 @@
* KIND, either express or implied. * KIND, either express or implied.
* *
****************************************************************************/ ****************************************************************************/
#include "stdbool.h"
#include "i2c.h" #include "i2c.h"
#include "debug.h" #include "debug.h"
#include "dac.h" #include "dac.h"
int dac_volume(unsigned int volume) int dac_volume(unsigned int left, unsigned int right, bool deemph)
{ {
int ret = 0; int ret = 0;
unsigned char buf[3]; unsigned char buf[3];
i2c_begin(); i2c_begin();
if(volume > 0x38) if (left > 0x38)
volume = 0x38; left = 0x38;
if (right > 0x38)
right = 0x38;
buf[0] = DAC_REG_WRITE | DAC_AVOL; buf[0] = DAC_REG_WRITE | DAC_AVOL;
buf[1] = (volume & 0x3f) | 0x40; /* Deemphasis ON */ buf[1] = (left & 0x3f) | (deemph ? 0x40 : 0);
buf[2] = volume & 0x3f; buf[2] = right & 0x3f;
/* send read command */ /* send read command */
if (i2c_write(DAC_DEV_WRITE,buf,3)) if (i2c_write(DAC_DEV_WRITE,buf,3))

2
firmware/drivers/dac.h
View file

@ -32,7 +32,7 @@
#define DAC_AVOL 2 #define DAC_AVOL 2
#define DAC_GCFG 3 #define DAC_GCFG 3
extern int dac_volume(unsigned int volume); extern int dac_volume(unsigned int left, unsigned int right, bool deemph);
extern int dac_config(int value); extern int dac_config(int value);
#endif #endif