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Added left/right/deemphasis functionality of dac_volume

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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
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13
firmware/drivers/dac.c
View file

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