SAADC Easy DMA with 1 Channel

[radioschmadio]

I am using SAADC and reading in 1 analog channel. The data sheet says that scan mode is enabled when 2 or more channels are turned on. What if I am only using 1 channel ? How can I turn on scan mode and have the DMA store the results in memory?

Right now with one channel selected, the results are put in memory by the DMA, but the buffer pointer is not incrementing. As soon as I add another channel, the buffer pointer begins to increment.

[radioschmadio]

uint32_t adc_results[1024]={0};

void setup_adc() { NRF_SAADC ->ENABLE = 0;

	NRF_SAADC ->RESOLUTION = 2 ; //12 bit resolution
	NRF_SAADC ->OVERSAMPLE = 0; //bypass over sampling

	NRF_SAADC ->RESULT.PTR = (uint32_t)&adc_results[0];
	NRF_SAADC ->RESULT.MAXCNT = 512; 
	NRF_SAADC ->SAMPLERATE= 0x000010FF;  //fast sample rate auto 

	NRF_SAADC ->CH[0].CONFIG = 	(SAADC_CH_CONFIG_BURST_Disabled << SAADC_CH_CONFIG_BURST_Pos) | \
															(SAADC_CH_CONFIG_MODE_SE << SAADC_CH_CONFIG_MODE_Pos ) | \
															(SAADC_CH_CONFIG_TACQ_10us << SAADC_CH_CONFIG_TACQ_Pos ) | \
															(SAADC_CH_CONFIG_REFSEL_Internal << SAADC_CH_CONFIG_REFSEL_Pos) | \
															(SAADC_CH_CONFIG_GAIN_Gain1_6 << SAADC_CH_CONFIG_GAIN_Pos ) | \
															(SAADC_CH_CONFIG_RESN_Bypass << SAADC_CH_CONFIG_RESN_Pos ) | \
															(SAADC_CH_CONFIG_RESP_Bypass << SAADC_CH_CONFIG_RESP_Pos ) ;

	NRF_SAADC ->CH[0].LIMIT = 0;
	NRF_SAADC ->CH[0].PSELN = 0;
	NRF_SAADC ->CH[0].PSELP = 2;

	NRF_SAADC ->INTEN = 0x0000000E ; //enable int for end
	NRF_SAADC ->ENABLE = 1;
	NRF_SAADC ->TASKS_START = 1;
	

}

void start_adc() {

//NRF_SAADC ->TASKS_START = 1;
NRF_SAADC ->TASKS_SAMPLE = 1;

}

void SAADC_IRQHandler (void) {

NRF_SAADC ->INTEN = 0x00000000 ; //disable int for end
NRF_SAADC ->EVENTS_END = 0; //clear event
NRF_SAADC ->EVENTS_DONE = 0; //clear event
NRF_SAADC ->EVENTS_RESULTDONE = 0; //clear event
//NRF_SAADC ->TASKS_START = 1;
    //NRF_SAADC ->TASKS_SAMPLE = 1;
NRF_SAADC ->RESULT.PTR = (uint32_t)&adc_results[0];
NRF_SAADC ->INTEN = 0x00000002 ; //enable int for end

}