EK-TM4C1294XL: Analog to digital conversion interrupt not triggered

Nicolas Demonty

Part Number: EK-TM4C1294XL

Hi,

I'm using a TM4C1294XL board and I'm trying to use interrupt to retrieve the result of the ADC instead of waiting. I'm using CCS and the driverlib code to configure the board. My first code did a manual trigger to convert and show on putty the internal temperature. So the UART0 and ADC config works. I try now to use always sampling and interrupt to retrieve the result instead of waiting. However impossible to make the interrupt work. Could you please help me ? Here is the code a the main.c and of startups_ccs. I don t post the UART code as it works.

main.c

void ADC0seq3_Handler(void){
	uint32_t ADC0Value[1];
	volatile unsigned long TempValue;
	ADCSequenceDataGet(ADC0_BASE, 3, ADC0Value);
	TempValue = (1475 - ((2475 * ADC0Value[0]))/4096)/10;
	UARTprintf("Current core temperature : ");
	UARTprintf("Temperature = %3d*C", TempValue);
	UARTprintf("\n");
	ADCIntClear(ADC0_BASE, 3);
}

int main(void) {

	//Init the ADC0 and sequence 3 is used.
	ADCSequenceDisable(ADC0_BASE, 3);
	IntMasterDisable();
	IntDisable(INT_ADC0SS3_TM4C129);
	ADCIntDisable(ADC0_BASE, 3);

	SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
	while(!SysCtlPeripheralReady(SYSCTL_PERIPH_ADC0)){
		// Wait till the module is ready.
    	}

	ADCClockConfigSet(ADC0_BASE, ADC_CLOCK_SRC_PIOSC | ADC_CLOCK_RATE_FULL, 1);
	ADCSequenceConfigure(ADC0_BASE, 3, ADC_TRIGGER_ALWAYS, 0);
	ADCSequenceStepConfigure(ADC0_BASE, 3, 0, ADC_CTL_TS | ADC_CTL_IE | ADC_CTL_END);

	IntEnable(INT_ADC0SS3_TM4C129);
	ADCIntClear(ADC0_BASE, 3);
	ADCIntEnable(ADC0_BASE, 3);
	IntMasterEnable();
	ADCSequenceEnable(ADC0_BASE, 3);			// Enable sequencer ADC0 seq3.

	while(1){
		//here the interrupts should occur
	}

	return 0;
}

and here is my startup_ccs file

extern void ADC0seq3_Handler(void);

#pragma DATA_SECTION(g_pfnVectors, ".intvecs")
void (* const g_pfnVectors[])(void) =
{
    (void (*)(void))((uint32_t)&__STACK_TOP),
                                            // The initial stack pointer
    ResetISR,                               // The reset handler
    NmiSR,                                  // The NMI handler
    FaultISR,                               // The hard fault handler
    IntDefaultHandler,                      // The MPU fault handler
    IntDefaultHandler,                      // The bus fault handler
    IntDefaultHandler,                      // The usage fault handler
    0,                                      // Reserved
    0,                                      // Reserved
    0,                                      // Reserved
    0,                                      // Reserved
    IntDefaultHandler,                      // SVCall handler
    IntDefaultHandler,                      // Debug monitor handler
    0,                                      // Reserved
    IntDefaultHandler,                      // The PendSV handler
    IntDefaultHandler,                      // The SysTick handler
    IntDefaultHandler,                      // GPIO Port A
    IntDefaultHandler,                      // GPIO Port B
    IntDefaultHandler,                      // GPIO Port C
    IntDefaultHandler,                      // GPIO Port D
    IntDefaultHandler,                      // GPIO Port E
    IntDefaultHandler,                      // UART0 Rx and Tx
    IntDefaultHandler,                      // UART1 Rx and Tx
    IntDefaultHandler,                      // SSI0 Rx and Tx
    IntDefaultHandler,                      // I2C0 Master and Slave
    IntDefaultHandler,                      // PWM Fault
    IntDefaultHandler,                      // PWM Generator 0
    IntDefaultHandler,                      // PWM Generator 1
    IntDefaultHandler,                      // PWM Generator 2
    IntDefaultHandler,                      // Quadrature Encoder 0
	IntDefaultHandler,                      // ADC Sequence 0
    IntDefaultHandler,                      // ADC Sequence 1
    IntDefaultHandler,                      // ADC Sequence 2
	ADC0seq3_Handler,                       // ADC Sequence 3
    IntDefaultHandler,                      // Watchdog timer
    IntDefaultHandler,                      // Timer 0 subtimer A
    IntDefaultHandler,                      // Timer 0 subtimer B
    IntDefaultHandler,                      // Timer 1 subtimer A
    IntDefaultHandler,                      // Timer 1 subtimer B
    IntDefaultHandler,                      // Timer 2 subtimer A
    IntDefaultHandler,                      // Timer 2 subtimer B
    IntDefaultHandler,                      // Analog Comparator 0
    IntDefaultHandler,                      // Analog Comparator 1
    IntDefaultHandler,                      // Analog Comparator 2
    IntDefaultHandler,                      // System Control (PLL, OSC, BO)
    IntDefaultHandler,                      // FLASH Control
    IntDefaultHandler,                      // GPIO Port F
    IntDefaultHandler,                      // GPIO Port G
    IntDefaultHandler,                      // GPIO Port H
    IntDefaultHandler,                      // UART2 Rx and Tx
    IntDefaultHandler,                      // SSI1 Rx and Tx
    IntDefaultHandler,                      // Timer 3 subtimer A
    IntDefaultHandler,                      // Timer 3 subtimer B
    IntDefaultHandler,                      // I2C1 Master and Slave
    IntDefaultHandler,                      // CAN0
    IntDefaultHandler,                      // CAN1
    IntDefaultHandler,                      // Ethernet
    IntDefaultHandler,                      // Hibernate
    IntDefaultHandler,                      // USB0
    IntDefaultHandler,                      // PWM Generator 3
    IntDefaultHandler,                      // uDMA Software Transfer
    IntDefaultHandler,                      // uDMA Error
    IntDefaultHandler,                      // ADC1 Sequence 0
    IntDefaultHandler,                      // ADC1 Sequence 1
    IntDefaultHandler,                      // ADC1 Sequence 2
    IntDefaultHandler,                      // ADC1 Sequence 3
    IntDefaultHandler,                      // External Bus Interface 0
    IntDefaultHandler,                      // GPIO Port J
    IntDefaultHandler,                      // GPIO Port K
    IntDefaultHandler,                      // GPIO Port L
    IntDefaultHandler,                      // SSI2 Rx and Tx
    IntDefaultHandler,                      // SSI3 Rx and Tx
    IntDefaultHandler,                      // UART3 Rx and Tx
    IntDefaultHandler,                      // UART4 Rx and Tx
    IntDefaultHandler,                      // UART5 Rx and Tx
    IntDefaultHandler,                      // UART6 Rx and Tx
    IntDefaultHandler,                      // UART7 Rx and Tx
    IntDefaultHandler,                      // I2C2 Master and Slave
    IntDefaultHandler,                      // I2C3 Master and Slave
    IntDefaultHandler,                      // Timer 4 subtimer A
    IntDefaultHandler,                      // Timer 4 subtimer B
    IntDefaultHandler,                      // Timer 5 subtimer A
    IntDefaultHandler,                      // Timer 5 subtimer B
    IntDefaultHandler,                      // FPU
    0,                                      // Reserved
    0,                                      // Reserved
    IntDefaultHandler,                      // I2C4 Master and Slave
    IntDefaultHandler,                      // I2C5 Master and Slave
    IntDefaultHandler,                      // GPIO Port M
    IntDefaultHandler,                      // GPIO Port N
    0,                                      // Reserved
    IntDefaultHandler,                      // Tamper
    IntDefaultHandler,                      // GPIO Port P (Summary or P0)
    IntDefaultHandler,                      // GPIO Port P1
    IntDefaultHandler,                      // GPIO Port P2
    IntDefaultHandler,                      // GPIO Port P3
    IntDefaultHandler,                      // GPIO Port P4
    IntDefaultHandler,                      // GPIO Port P5
    IntDefaultHandler,                      // GPIO Port P6
    IntDefaultHandler,                      // GPIO Port P7
    IntDefaultHandler,                      // GPIO Port Q (Summary or Q0)
    IntDefaultHandler,                      // GPIO Port Q1
    IntDefaultHandler,                      // GPIO Port Q2
    IntDefaultHandler,                      // GPIO Port Q3
    IntDefaultHandler,                      // GPIO Port Q4
    IntDefaultHandler,                      // GPIO Port Q5
    IntDefaultHandler,                      // GPIO Port Q6
    IntDefaultHandler,                      // GPIO Port Q7
    IntDefaultHandler,                      // GPIO Port R
    IntDefaultHandler,                      // GPIO Port S
    IntDefaultHandler,                      // SHA/MD5 0
    IntDefaultHandler,                      // AES 0
    IntDefaultHandler,                      // DES3DES 0
    IntDefaultHandler,                      // LCD Controller 0
    IntDefaultHandler,                      // Timer 6 subtimer A
    IntDefaultHandler,                      // Timer 6 subtimer B
    IntDefaultHandler,                      // Timer 7 subtimer A
    IntDefaultHandler,                      // Timer 7 subtimer B
    IntDefaultHandler,                      // I2C6 Master and Slave
    IntDefaultHandler,                      // I2C7 Master and Slave
    IntDefaultHandler,                      // HIM Scan Matrix Keyboard 0
    IntDefaultHandler,                      // One Wire 0
    IntDefaultHandler,                      // HIM PS/2 0
    IntDefaultHandler,                      // HIM LED Sequencer 0
    IntDefaultHandler,                      // HIM Consumer IR 0
    IntDefaultHandler,                      // I2C8 Master and Slave
    IntDefaultHandler,                      // I2C9 Master and Slave
    IntDefaultHandler                       // GPIO Port T
};

over 8 years ago

0 Amit Ashara over 8 years ago

TI__Guru**** 244400 points

Hello Nicolas

First of all does the interrupt work in the code? i.e. If you put a breakpoint on the interrupt handler does it function?

0 Nicolas Demonty over 8 years ago in reply to Amit Ashara

Prodigy 200 points

Hello

thanks for the reply.

Actually it works. It was not related to the interrupt itself but to an inversion in the ADC config

//Init the ADC0 and sequence 3 is used.

ADCSequenceDisable(ADC0_BASE, 3);

must be set after providing the clock to the component otherwise the ADC and the interrupt dont work

sorry for this

0 Amit Ashara over 8 years ago in reply to Nicolas Demonty

TI__Guru**** 244400 points

Hello Nicolas

When using the device from a startup the above line is not required as the sequencer's are already disabled.

Now coming to the issue of display, I make an assumption that baud rate is 115200. Now you are transmitting ~50 character and each character on the bus is 10 bits (8 bits for data, 1 bit for start and 1 bit for stop). Total time to send out one temperature value is 50*10/115200 which is ~4.3ms. The conversion rate is 1 us. So you have ended up with conversions much much faster than what you can output.

0 Nicolas Demonty over 8 years ago in reply to Amit Ashara

Prodigy 200 points

Hi

thanks for taking care of my code. Actually I used the display only to validate that the ADC is running well. The final goal is sampling an analog signal, then using a DSP to filter noise and do other post treatment and then send that digitalized signal via ethernet port. I just have now chose may be a c5000series.

thanks again

0 Amit Ashara over 8 years ago in reply to Nicolas Demonty

TI__Guru**** 244400 points

Hello Nicolas

I perform the same kind of operations (though not a CMSIS DSP filter in the audio TI Design)

www.ti.com/.../TIDM-TM4C129POEAUDIO

Arm-based microcontrollers

Arm-based microcontrollers forum

EK-TM4C1294XL: Analog to digital conversion interrupt not triggered