Timer16_0 and ADC in burst mode

lpcware — Wed, 15 Jun 2016 19:41:26 GMT

Content originally posted in LPCWare by vdelabouere on Tue Dec 17 18:17:38 MST 2013
Hi,

I'm using Timer16_0 to generate a 1ms interrupt to do some tasks.

Now I want to use the ADC in burst mode for the first 4 ADC channels.
Here is the ADC_Init function :
void ADCInit( uint32_t ADC_Clk )
{
uint32_t i;

/* Disable Power down bit to the ADC block. */
LPC_SYSCON->PDRUNCFG &= ~(0x1<<4);

/* Enable AHB clock to the ADC. */
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<13);

for ( i = 0; i < 4; i++ )
{
ADCValue = 0x0;
}
// IO configuration
LPC_IOCON->TDI_PIO0_11 &= ~0x9F; /* ADC I/O config */
LPC_IOCON->TDI_PIO0_11 |= 0x02; /* ADC IN0 */
LPC_IOCON->TMS_PIO0_12 &= ~0x9F;
LPC_IOCON->TMS_PIO0_12 |= 0x02; /* ADC IN1 */
LPC_IOCON->TDO_PIO0_13 &= ~0x9F;
LPC_IOCON->TDO_PIO0_13 |= 0x02; /* ADC IN2 */
LPC_IOCON->TRST_PIO0_14 &= ~0x9F;
LPC_IOCON->TRST_PIO0_14 |= 0x02; /* ADC IN3 */

LPC_ADC->CR = ( 0x01 << 0 ) | /* SEL=1,select channel 0~7 on ADC0 */
( ( SystemCoreClock / ADC_Clk - 1 ) << 8 ) | /* CLKDIV = Fpclk / 1000000 - 1 */
( 0 << 16 ) | /* BURST = 0, no BURST, software controlled */
( 0 << 17 ) | /* CLKS = 0, 11 clocks/10 bits */
( 0 << 24 ) | /* START = 0 A/D conversion stops */
( 0 << 27 );/* EDGE = 0 (CAP/MAT singal falling,trigger A/D conversion) */

// Enable the ADC ISR
NVIC_EnableIRQ(ADC_IRQn);
LPC_ADC->INTEN = 0x0F;/* Enable interrupts for the first 4 ADC Channels */
return;
}

When I want to start the burst mode, I call this function :
void ADCBurstStart( void )
{
if ( LPC_ADC->CR & (0x7<<24) )
{
LPC_ADC->CR &= ~(0x7<<24);
}
/* Read channels, 0 through 3.*/
LPC_ADC->CR |= (0x0F);
LPC_ADC->CR |= (0x1<<16);/* Set burst mode and start A/D convert */
return;/* the ADC reading is done inside the
handler, return 0. */
}

It seems that as soon as I launch the ADC in burst mode, I don't have any more timer interrupts !
Any idea ?

Thanks

Vince

Re: Timer16_0 and ADC in burst mode

lpcware — Wed, 15 Jun 2016 19:41:27 GMT

Content originally posted in LPCWare by R2D2 on Tue Dec 17 18:48:30 MST 2013
How do you stop burst mode?

Re: Timer16_0 and ADC in burst mode

lpcware — Wed, 15 Jun 2016 19:41:28 GMT

Content originally posted in LPCWare by vdelabouere on Wed Dec 18 06:16:43 MST 2013
I stop the burst mode inside the timer ISR and restart it after in the main loop if needed.

Re: Timer16_0 and ADC in burst mode

lpcware — Wed, 15 Jun 2016 19:41:28 GMT

Content originally posted in LPCWare by R2D2 on Wed Dec 18 06:52:06 MST 2013
Without seeing your code, especially timer ISR and ADC ISR it's difficult to guess.
Is your timer interrupt still triggered? Did you change interrupt priorities?

Would be useful if you reduce your project to the basic problem and export / post it...

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