www.pudn.com > headset.rar > volume.c

/* 
    Volume.c 
  
    Handles the volume control for the headset These functions can be 
    called either when a volume button is pressed or when a VGS 
    command is received. 
*/ 
 
#include "demohs.h" 
#include "hal.h" 
 
#include  
#include  
 
 
 
/* 
    sendVolume 
 
    Internal function to tell the framework to change the volume and 
    communicate this to the Audio Gateway (AG). 
*/ 
 
static void sendVolume(int8  inc, uint8 gn) 
{ 
    MAKE_MSG(HS_VGS_REQ);            /* Create a message primitive */ 
    msg->increment = (int8) inc;     /* populate the message */ 
    msg->gain = gn;                  /* populate the message */ 
    putMsg(msg);                     /* put the message in the sceduler queue */ 
} 
 
 
/* 
   sendInitialVolume 
 
   Sends the initial volume of the headset on connection 
   establishment.  See demohs.h for default values. 
*/ 
void sendInitialVolume() 
{ 
    sendVolume(VG_ZERO_INCREMENT, VG_ZERO_GAIN); 
} 
 
 
/* 
    onVolumeUp 
 
    Called by checkButtons whenever the volume up button is seen to 
    have changed state. 
*/ 
void onVolumeUp() 
{ 
    sendVolume(VG_VOLUME_UP, VG_ZERO_GAIN); 
} 
 
 
/* 
    onVolumeDown 
   
    Called by checkButtons whenever the volume down button is seen to 
    have changed state. 
*/ 
 
void onVolumeDown() 
{ 
    sendVolume(VG_VOLUME_DOWN, VG_ZERO_GAIN); 
} 
 
 
/* 
    vgsInd 
 
    Called by the headsetframework whenever a VGS is received.  This 
    may be as a result of us sending a VGS_REQ because the user 
    pressed a volume button. 
  
    Note that we will always get a VGS_IND even if we are already at 
    minimum or maximum volume.  This is to allow us to give a warning 
    beep. 
*/ 
 
void vgsInd(const HS_VGS_IND_T * ind) 
{ 
    HALsetVolume(ind->gain) ; 
}