//*****************************************************************************
//
// This function implements the auto channel change policy.
//
//*****************************************************************************
static void
CheckChangeChannel(void)
{
#ifdef FREQUENCY_AGILITY
int8_t ucdBm, ucInARow = 0;
unsigned long ulLoop;
//
// Clear out our signal quality array.
//
memset(g_cSample, 0x0, SSIZE);
//
// Poll the signal quality several times.
//
for (ulLoop = 0; ulLoop < SSIZE; ulLoop++)
{
//
// Exit early if we need to service an app frame.
//
if (g_ucPeerFrameSem || g_ucJoinSem)
{
return;
}
//
// Get the signal quality from the radio.
//
NWK_DELAY(1);
SMPL_Ioctl(IOCTL_OBJ_RADIO, IOCTL_ACT_RADIO_RSSI, (void *)&ucdBm);
g_cSample[ulLoop] = ucdBm;
//
// Is the noise level above our threshold?
//
if (ucdBm > INTERFERENCE_THRESHOLD_DBM)
{
//
// Yes - increment the counter we use to determine how long the
// signal quality has been unacceptable and check to see if we've
// reached the point where we perform an automatic channel change.
//
if (++ucInARow == IN_A_ROW)
{
//
// Signal quality has been too bad for too long so try the next
// channel.
//
ChangeChannel();
break;
}
}
else
{
//
// Signal quality is fine so clear the counter we use to determine
// how long the quality has been bad.
//
ucInARow = 0;
}
}
#endif
return;
}
//*****************************************************************************
//
// Main application entry function.
//
//*****************************************************************************
int
main(void)
{
tBoolean bRetcode;
bspIState_t intState;
uint8_t ucLastChannel;
//
// Set the system clock to run at 50MHz from the PLL
//
ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);
//
// NB: We don't call PinoutSet() in this testcase since the EM header
// expansion board doesn't currently have an I2C ID EEPROM. If we did
// call PinoutSet() this would configure all the EPI pins for SDRAM and
// we don't want to do this.
//
g_eDaughterType = DAUGHTER_NONE;
//
// Enable peripherals required to drive the LCD.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOH);
//
// Configure SysTick for a 10Hz interrupt.
//
ROM_SysTickPeriodSet(ROM_SysCtlClockGet() / TICKS_PER_SECOND);
ROM_SysTickEnable();
ROM_SysTickIntEnable();
//
// Initialize the display driver.
//
Kitronix320x240x16_SSD2119Init();
//
// Initialize the touch screen driver.
//
TouchScreenInit();
//
// Set the touch screen event handler.
//
TouchScreenCallbackSet(WidgetPointerMessage);
//
// Add the compile-time defined widgets to the widget tree.
//
WidgetAdd(WIDGET_ROOT, (tWidget *)&g_sHeading);
//
// Initialize the status string.
//
UpdateStatus(true, "Initializing...");
//
// Paint the widget tree to make sure they all appear on the display.
//
WidgetPaint(WIDGET_ROOT);
//
// Initialize the SimpliciTI BSP.
//
BSP_Init();
//
// Set the SimpliciTI device address using the current Ethernet MAC address
// to ensure something like uniqueness.
//
bRetcode = SetSimpliciTIAddress();
//
// Did we have a problem with the address?
//
if(!bRetcode)
{
//
// Yes - make sure the display is updated then hang the app.
//
WidgetMessageQueueProcess();
while(1)
{
//
// MAC address is not set so hang the app.
//
}
}
//
// Turn on both our LEDs
//
SetLED(1, true);
SetLED(2, true);
UpdateStatus(true, "Waiting for a device...");
//
// Initialize the SimpliciTI stack and register our receive callback.
//
SMPL_Init(ReceiveCallback);
//
// Tell the user what's up.
//
UpdateStatus(true, "Access point active.");
//
// Do nothing after this - the SimpliciTI stack code handles all the
// access point function required.
//
while(1)
{
//
// Wait for the Join semaphore to be set by the receipt of a Join
// frame from a device that supports an end device.
//
// An external method could be used as well. A button press could be
// connected to an ISR and the ISR could set a semaphore that is
// checked by a function call here, or a command shell running in
// support of a serial connection could set a semaphore that is
// checked by a function call.
//
if (g_ucJoinSem && (g_ucNumCurrentPeers < NUM_CONNECTIONS))
{
//
// Listen for a new incoming connection.
//
while (1)
{
if (SMPL_SUCCESS == SMPL_LinkListen(&g_sLID[g_ucNumCurrentPeers]))
{
//
// The connection attempt succeeded so break out of the
// loop.
//
break;
}
//
// Process our widget message queue.
//
WidgetMessageQueueProcess();
//
// A "real" application would implement its fail-to-link
// policy here. We go back and listen again.
//
}
//
// Increment our peer counter.
//
g_ucNumCurrentPeers++;
//
// Decrement the join semaphore.
//
BSP_ENTER_CRITICAL_SECTION(intState);
g_ucJoinSem--;
BSP_EXIT_CRITICAL_SECTION(intState);
//
// Tell the user how many devices we are now connected to.
//
UpdateStatus(false, "%d devices connected.", g_ucNumCurrentPeers);
}
//
// Have we received a frame on one of the ED connections? We don't use
// a critical section here since it doesn't really matter much if we
// miss a poll.
//
if (g_ucPeerFrameSem)
{
uint8_t pucMsg[MAX_APP_PAYLOAD], ucLen, ucLoop;
/* process all frames waiting */
for (ucLoop = 0; ucLoop < g_ucNumCurrentPeers; ucLoop++)
{
//
// Receive the message.
//
if (SMPL_SUCCESS == SMPL_Receive(g_sLID[ucLoop], pucMsg,
&ucLen))
{
//
// ...and pass it to the function that processes it.
//
ProcessMessage(g_sLID[ucLoop], pucMsg, ucLen);
//
// Decrement our frame semaphore.
//
BSP_ENTER_CRITICAL_SECTION(intState);
g_ucPeerFrameSem--;
BSP_EXIT_CRITICAL_SECTION(intState);
}
}
}
//
// Have we been asked to change channel?
//
ucLastChannel = g_ucChannel;
if (g_bChangeChannel)
{
//
// Yes - go ahead and change to the next radio channel.
//
g_bChangeChannel = false;
ChangeChannel();
}
else
{
//
// No - check to see if we need to automatically change channel
// due to interference on the current one.
//
CheckChangeChannel();
}
//
// If the channel changed, update the display.
//
if(g_ucChannel != ucLastChannel)
{
UpdateStatus(false, "Changed to channel %d.", g_ucChannel);
}
//
// If required, blink the "LEDs" to indicate we are waiting for a
// message following a channel change.
//
BSP_ENTER_CRITICAL_SECTION(intState);
if (g_ulBlinky)
{
if (++g_ulBlinky >= 0xF)
{
g_ulBlinky = 1;
ToggleLED(1);
ToggleLED(2);
}
}
BSP_EXIT_CRITICAL_SECTION(intState);
//
// Process our widget message queue.
//
WidgetMessageQueueProcess();
}
}
AM_UINT CAudioCodecPcm::decode(AM_U8 *input, AM_UINT inDataSize,
AM_U8 *output, AM_UINT *outDataSize)
{
return ChangeChannel(input, output, inDataSize, outDataSize);
}
