pioag_pin.c

bluetooth audio gateway

#include "pioag_private.h"
#include "ag_types.h"

#include <panic.h>
#include <pio.h>
#include <ps.h>
#include <stdlib.h>
#include <string.h>


/*
    pioAgLedFlashTimer
 
    Timer function that flashes the LEDs and increments the PIN Code count.
*/
static Delay pioAgLedFlashTimer(TimerHandle h)
{    
    uint16 pioValue = 0;
    uint16 pioMask = LED1 | LED2;
    
    /* keep the compiler happy */
    h = h;

    /* Get the current PIO values and mask the stuff we're not interested in */
    pioValue = PioGet() & pioMask;

    if (pioValue)
    {
       /* Reset LED's */
        PioSet(LED1 | LED2, 0);
    }
    else
    {
        /* 
            Increment count, note that this will contain a number that is 
            one bigger than required since it counts the number of times 
            this function is called which will include the zero indication.
        */         
        PioAgState.pinCode[PioAgState.pinLengthBytes]++;

        /* Reset count to zero if it is too big */
        if (PioAgState.pinCode[PioAgState.pinLengthBytes] > 10)
            PioAgState.pinCode[PioAgState.pinLengthBytes] = 1; 

        /* Set LED's */
        if (PioAgState.pinCode[PioAgState.pinLengthBytes] == 1)
        {
            /* Set zero indicator */
            PioSet(LED1, LED1);
        }
        else
        {
            /* Set non-zero indicator */
            PioSet(LED2, LED2);
        }
    }

    return D_mSEC(500);
}


/*
    pioAgGetPinCode
    
    Gets pin code from user, this is done by a cunning sequence of
    flashing LED's and button presses. PIO2 flashes to indicate a zero, 
    then PIO3 flashes to indicate 1.2.3. etc. When the LED's have flashed 
    the appropriate number of times press PIO6 to move on to the next pin 
    enter. When the PIN has been entered press PIO7 to move on to the next step.
*/
void pioAgGetPinCode(void)
{
    /* Start LED Flash Timer */
    if (PioAgState.timerHandle == NULL_TIMER)
    {    
        /* This is called repeatedly so only alloc array if there is no pin stored */
        if (PioAgState.pinLengthBytes == 0)
        {
            /* Allocate the array we're going to store the PIN in and init it to zero */
            PioAgState.pinCode = (uint8 *)PanicNull(malloc(MAX_PIN_LENGTH));
            memset(PioAgState.pinCode, 0, MAX_PIN_LENGTH);
        }

        PioAgState.timerHandle = TimerAdd(D_mSEC(1000), pioAgLedFlashTimer);
    }
}


/*
    pioAgPinEntryComplete

    Pin entry stage has finished either because the user has pressed a 
    button to indicate this or because the full MAX_PIN_LENGTH values
    have been entered
*/
void pioAgPinEntryComplete(void)
{
    /* PIN entry is complete send message to start inquiry */    
    uint16 tmp_len = PioAgState.pinLengthBytes;
        
    /* Cancel the timer and clear the LED's */
    TimerCancel(PioAgState.timerHandle);
    PioAgState.timerHandle = NULL_TIMER;    
    
    /* Reset the Leds */
    PioSet(LED1 | LED2, 0);
    
    /* Store the PIN code and its length. */
    (void) PsStore(PIO_AG_PS_PIN_CODE, PioAgState.pinCode, PioAgState.pinLengthBytes);    
    (void) PsStore(PIO_AG_PS_PIN_LENGTH, &(tmp_len), 1);
    PioAgState.pinEntered = 1;
    
    /* 
        PIN stored so free the pin code array. If we need the PIN we have to
        read it out of persistent store. This saves us a few words since the 
        PIN is usually only entered once (or a small number of times).
    */
    PioAgState.pinLengthBytes = 0;
    free(PioAgState.pinCode);
    PioAgState.pinCode = 0;
    
    /* Start Inquiry */
    pioAgInquiryReq();
}