//*****************************************************************************
//
//! This is the code that gets called when the processor receives an unexpected
//! interrupt. This simply enters an infinite loop, preserving the system
//! state for examination by a debugger.
//!
//! \return None.
//
//*****************************************************************************
void
IntDefaultHandler(void)
{
//
// Disable all interrupts.
//
IntMasterDisable();
//
// Turn off all the PWM outputs.
//
PWMOutputState(PWM0_BASE, PWM_OUT_0_BIT | PWM_OUT_1_BIT | PWM_OUT_2_BIT |
PWM_OUT_3_BIT | PWM_OUT_4_BIT | PWM_OUT_5_BIT,
false);
//
// Turn on STATUS and MODE LEDs. They will remain on.
//
BlinkStart(STATUS_LED, 1, 1, 1);
BlinkStart(MODE_LED, 1, 1, 1);
BlinkHandler();
//
// Go into an infinite loop.
//
while(1)
{
}
}
//*****************************************************************************
//
//! Update the firmware using the bootloader.
//!
//! This function is called by the serial user interface when the firmware
//! update command is received.
//!
//! \return None.
//
//*****************************************************************************
void
UIUpgrade(void)
{
//
// Emergency stop the motor drive.
//
StepperEmergencyStop();
//
// Disable all processor interrupts. Instead of disabling them one at a
// time (and possibly missing an interrupt if new sources are added), a
// direct write to NVIC is done to disable all peripheral interrupts.
//
HWREG(NVIC_DIS0) = 0xffffffff;
//
// Also disable the SysTick interrupt.
//
SysTickIntDisable();
//
// Turn off all the on-board LEDs.
//
BlinkStart(STATUS_LED, 0, 1, 1);
BlinkStart(MODE_LED, 0, 1, 1);
BlinkHandler();
//
// Stop running from the PLL.
//
SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_6MHZ);
//
// Reconfigure the UART for 115,200, 8-N-1 operation with new clock.
//
UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), 115200,
(UART_CONFIG_WLEN_8 | UART_CONFIG_PAR_NONE |
UART_CONFIG_STOP_ONE));
//
// Return control to the boot loader. This is a call to the SVC handler in
// the boot loader.
//
(*((void (*)(void))(*(unsigned long *)0x2c)))();
//
// Control should never return here, but just in case it does.
//
while(1)
{
}
}
//*****************************************************************************
//
//! Handles the SysTick interrupt.
//!
//! This function is called when SysTick asserts its interrupt. It is
//! responsible for handling the on-board user interface elements (push button
//! and potentiometer) if enabled, and the processor usage computation.
//!
//! \return None.
//
//*****************************************************************************
void
SysTickIntHandler(void)
{
static unsigned int uDataUpdate = UI_INT_RATE / 10;
static unsigned long ulLastPotPosition = 0;
static unsigned long ulLastBlink = 0;
static long lLastPotDelta = 0;
static unsigned short usLastBusVoltage = 0;
static unsigned char bFaultBlink = 0;
unsigned long ulBlink;
unsigned long ulADCCounts[8]; // 0-pot, 1-busV, 2-temperature
long lSamples;
long lPotDelta;
//
// Get the motor status. This will update the fields in the
// stepper status structure.
//
pStepperStatus = StepperGetMotorStatus();
//
// Compute the average current, which is what gets reported through
// the UI.
//
g_usMotorCurrent = (pStepperStatus->usCurrent[0] +
pStepperStatus->usCurrent[1] + 1) / 2;
//
// Get the previous ADC samples, and start a new acquisition
//
lSamples = ADCSequenceDataGet(ADC0_BASE, UI_ADC_SEQUENCER, ulADCCounts);
ADCProcessorTrigger(ADC0_BASE, UI_ADC_SEQUENCER);
//
// Read the bus voltage and convert to millivolts,
// and the CPU temperature and convert to C
//
if(lSamples == 3)
{
g_usBusVoltage = (unsigned short)((ulADCCounts[1] * 81300) / 1023);
g_sAmbientTemp = (59960 - (ulADCCounts[2] * 100)) / 356;
}
//
// If the bus voltage has changed more than 0.5 volts, then call
// the UISetMotorParms() function, which will force an update of
// the PWM duty cycle calculation. This will insure that the PWM
// duty cycle is correct if the bus voltage changes.
//
if(ABS((int)g_usBusVoltage - (int)usLastBusVoltage) > 500)
{
UISetMotorParms();
usLastBusVoltage = g_usBusVoltage;
}
//
// Periodically send real time data
//
if(!uDataUpdate--)
{
uDataUpdate = UI_INT_RATE / 20;
UISerialSendRealTimeData();
}
//
// If a fault just occurred, then start the status LED blinking
// at a rapid rate.
//
if(pStepperStatus->ucFaultFlags && !bFaultBlink)
{
BlinkStart(STATUS_LED, 4, 4, INT_MAX);
bFaultBlink = 1;
}
//
// Else, if a fault was just cleared, then stop the status LED blinking.
//
else if(!pStepperStatus->ucFaultFlags && bFaultBlink)
{
BlinkStart(STATUS_LED, 1, 1, 1);
bFaultBlink = 0;
}
//
// Otherwise, as normal, blink the status LED according to the number
// of steps moved.
//
else
{
//
// Blink the status LED every so many steps.
//
ulBlink = pStepperStatus->lPosition / ((2000 * 256) / 8);
if(ulBlink != ulLastBlink)
{
BlinkStart(STATUS_LED, UI_INT_RATE / 32, 1, 1);
ulLastBlink = ulBlink;
}
}
//
// Periodically call the blinker state machine.
//
BlinkHandler();
//
// Compute the new value for the processor usage.
//
g_ucCPUUsage = (CPUUsageTick() + 32768) / 65536;
//
// Do the following only if the on-board UI is enabled.
//
if(g_bUIUseOnboard == 1)
{
//
// Filter the potentiometer value. Make sure there is valid
// ADC data.
//
if(lSamples == 3)
{
ulPotPosition = UIOnboardPotentiometerFilter(ulADCCounts[0]);
}
else
{
//
// If ADC reading is suspect, then just use the last previous
// reading.
//
ulPotPosition = ulLastPotPosition;
}
//
// Set the minimum value to be use as 10. This sets the minimum
// speed for speed mode to 10.
//
if(ulPotPosition < 10)
{
ulPotPosition = 10;
}
//
// Read the on-board switch and pass its value to the switch
// debouncer. This will drive the button press functions
// UIButtonPress() and UIButtonHold() which will be called
// back if the button press or hold occurred.
//
UIOnboardSwitchDebouncer(GPIOPinRead(USER_BUTTON_PORT,
USER_BUTTON_PIN));
//
// Find the difference from the last pot measurement.
//
lPotDelta = ulPotPosition - ulLastPotPosition;
//
// Check if the direction is reversed. The following is used
// to ensure that the pot reading does not actually cause
// a change in direction (in position mode) due just to jitter
// in the potentiometer reading. Only a change above a certain
// value will be accepted. If the direction is not changed,
// then no filtering is done.
//
if((lPotDelta != 0) && ((lPotDelta * lLastPotDelta) < 0))
{
//
// If the direction is reversed, but the change is less than a
// certain amount, then don't accept the new potentiometer reading,
// and set it back to its previous value.
//
if(ABS(lPotDelta) < 20)
{
ulPotPosition = ulLastPotPosition;
}
//
// else, if the direction is reversed and changed more than a
// certain amount, then just leave the new pot reading as is,
// and remember the difference.
//
else
{
lLastPotDelta = lPotDelta;
}
}
//
// Else, the direction of the pot move was not reversed. Remember
// the (signed) difference. The new pot value will be used below.
//
else
{
lLastPotDelta = lPotDelta;
}
//
// Check to see if the potentiometer has moved.
//
if(ulPotPosition != ulLastPotPosition)
{
ulLastPotPosition = ulPotPosition;
//
// In position mode, the pot indicates the motor target
// position, so update the target position and command the
// motor to move.
//
if(eUIMode == UI_MODE_POSITION)
{
//
// Make sure that after conversion to steps, the target
// position actually changed, before sending a new motion
// command.
// The pot position is adjusted so that one revolution
// of the pot matches 200 steps, the number of steps in
// the motor. This gives the position mode a 1-1 feel,
// as the pot is turned, the motor turns a corresponding
// amount.
//
if(((ulPotPosition * 256 * 100) / 507) != g_lTargetPos)
{
g_lTargetPos = (ulPotPosition * 256 * 100) / 507;
UISetMotion();
}
}
//
// In speed mode, the pot indicates the motor speed, so
// command the motor to move using the new speed.
//
else if(eUIMode == UI_MODE_SPEED)
{
StepperSetMotion(g_lTargetPos, ulPotPosition,
g_sParameters.usAccel, g_sParameters.usDecel);
}
}
}
}
void BlinkWorkItemCallback(struct work_struct *work)
{
struct LED_871x *pLed = container_of(work, struct LED_871x, BlinkWorkItem);
BlinkHandler(pLed);
}