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DsPic - How to configure audio Digital-to-analog converter ?

 
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g.desvaux



Joined: 19 May 2009
Posts: 2

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DsPic - How to configure audio Digital-to-analog converter ?
PostPosted: Tue May 19, 2009 9:13 am     Reply with quote
Hello all,

I would like to use the audio digital-to-analog converter of a DSPIC33FJ64GP802, but there are no explanations in the CCS manual.

I find this in file 33FJ64GP802.h in the CCS Folder :
Code:

// Digital to Analog Functions: SETUP_DAC(), DAC_WRITE()
// Constants used in SETUP_DAC() are:
#define DAC_OFF  0
#define DAC_RIGHT_ON   0x00808000
#define DAC_LEFT_ON    0x80008000
#define DAC_RIGHT_MIDPOINT 0x00A08000
#define DAC_LEFT_MIDPOINT  0xA0008000
#define DAC_SIGNED   0x100
#define DAC_SLEEP_ON 0x1000
#define DAC_IDLE_OFF 0x2000
// Constants used as the first param in DAC_WRITE() are:
#define DAC_DEFAULT  0
#define DAC_RIGHT    1
#define DAC_LEFT     2

When I use these function, the compiler ask two parameters P1 and P2 :
Code:
SETUP_DAC(P1,P2)
DAC_WRITE(P1,P2)

What values can I use for P1 and P2 ?
Can you post a code example ?

Thanks,
g.desvaux



Joined: 19 May 2009
Posts: 2

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DsPic - How to configure audio Digital-to-analog converter ?
PostPosted: Fri May 29, 2009 3:37 am     Reply with quote
it's Ok.

Hardware configuration :
- DsPicc33FJ64GP802 (No DAC Midpoint output)
- Osc = 20MHz, Clock = 40MHz (PLL use)

Function setup_dac is not working properly.
I configure DAC Register with the following code in ASM :
Code:
 #asm
 MOV     #0x80, W4
 MOV     W4, 0x03F2
 MOV     #0x9003, W4
 MOV     W4, 0x03F0
 #endasm

DAC registers are configured for : DAC enables , Continue Module operation in Idle Mode, Analog output amplifier is enable during sleep/modeStop-in Idle mode bit, Data Unsigned, Divide input clock by 2, DAC right output Enable.
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