//*****************************************************************************
//
// This function is called to stop an acquisition running. It disables the
// ADC sequencers and the RTC match interrupt.
//
//*****************************************************************************
void
AcquireStop(void)
{
//
// Disable RTC interrupts
//
MAP_IntDisable(INT_HIBERNATE);
//
// Disable ADC interrupts
//
MAP_IntDisable(INT_ADC0SS0);
MAP_IntDisable(INT_ADC1SS0);
//
// Disable ADC sequencers
//
MAP_ADCSequenceDisable(ADC0_BASE, 0);
MAP_ADCSequenceDisable(ADC1_BASE, 0);
//
// If USB stick is being used, then close the file so it will flush
// the buffers to the USB stick.
//
if(g_psConfigState->ui8Storage == CONFIG_STORAGE_USB)
{
USBStickCloseFile();
}
//
// Disable the configuration pointer, which acts as a flag to indicate
// if we are properly configured for data acquisition.
//
g_psConfigState = 0;
}
/*
* @brief Initializes gyro.
*
* Sets sampling speed, configures and enables the gyro.
* @returns void
*/
void gyro_init(void) {
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC1);
//Set sampling speed
MAP_SysCtlADCSpeedSet(SYSCTL_ADCSPEED_500KSPS);
//Disable sample sequences for configuration
MAP_ADCSequenceDisable(ADC_BASE, GYRO_ADC_CHANNEL);
//Timer Trigger, priorities are same as number
MAP_ADCSequenceConfigure(ADC_BASE, GYRO_ADC_CHANNEL, ADC_TRIGGER_PROCESSOR, GYRO_ADC_CHANNEL);
MAP_ADCSequenceStepConfigure(ADC_BASE, GYRO_ADC_CHANNEL, 0, ADC_CTL_CH3 | ADC_CTL_END);
//Config sequence steps
MAP_ADCSequenceEnable(ADC_BASE, GYRO_ADC_CHANNEL);
}
void configureADC()
{
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);
MAP_SysCtlDelay(2);
// Disable sequencer 0
MAP_ADCSequenceDisable(ADC0_BASE, 3);
//
// Configure GPIO Pin
//
MAP_GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_7);
// **************************
// Configure timer
// **************************
MAP_TimerConfigure(TIMER1_BASE, TIMER_CFG_PERIODIC);
// Load timer for periodic sampling of ADC
MAP_TimerLoadSet(TIMER1_BASE, TIMER_A, g_ui32SysClock/SAMPLING_RATE);
// Enable ADC triggering
MAP_TimerControlTrigger(TIMER1_BASE, TIMER_A, true);
// Trigger ADC on timer A timeout
MAP_TimerADCEventSet(TIMER1_BASE, TIMER_ADC_TIMEOUT_A);
// **************************
// Configure ADC
// **************************
// Clear the interrupt raw status bit (should be done early
// on, because it can take several cycles to clear.)
MAP_ADCIntClear(ADC0_BASE, 3);
// ADC0, Seq 0, Timer triggered, Priority 0
MAP_ADCSequenceConfigure(ADC0_BASE, 3, ADC_TRIGGER_TIMER, 0);
// MAP_ADCSequenceConfigure(ADC0_BASE, 3, ADC_TRIGGER_PROCESSOR, 0);
/*// Set all 8 sequencer steps to sample from analog channel 5 (PD7)
int i;
for(i = 0; i < 1; i++)
{
MAP_ADCSequenceStepConfigure(ADC0_BASE, 0, i, ADC_CTL_CH5 | ADC_CTL_IE | ADC_CTL_END);
}
// Configure step 7 to trigger interrupt, and be the end of sequence
// MAP_ADCSequenceStepConfigure(ADC0_BASE, 0, 7, ADC_CTL_CH5 | ADC_CTL_IE | ADC_CTL_END);
*/
MAP_ADCSequenceStepConfigure(ADC0_BASE, 3, 0, ADC_CTL_CH4 | ADC_CTL_IE | ADC_CTL_END);
MAP_ADCSequenceEnable(ADC0_BASE, 3);
// Enable interrupts when sample conversion complete
MAP_ADCIntEnable(ADC0_BASE, 3);
// Enable NVIC interrupt for ADC0 SS0
MAP_IntEnable(INT_ADC0SS3);
MAP_IntMasterEnable();
MAP_TimerEnable(TIMER1_BASE, TIMER_A);
}
