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
