contiki/cpu/cc2430/dev/adc.c

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/**
* \file
* ADC functions
* \author
* Anthony "Asterisk" Ambuehl
*
* ADC initialization routine, trigger and result conversion routines.
*
*/
#include <stdio.h>
#include "banked.h"
#include "contiki.h"
#include "sys/clock.h"
#include "cc2430_sfr.h"
#include "dev/adc.h"
#include "dev/dma.h"
xDMAHandle adc_dma=0xff;
unsigned int *adc_dma_dest;
/*---------------------------------------------------------------------------*/
void adc_init(void) __banked
{
unsigned char jj;
while (!SLEEP&(HFRC_STB)) {}
/* power both 32MHz crystal and 15MHz RC */
SLEEP &= ~(OSC_PD);
/* printf("SLEEP 1 %x\n",SLEEP); */
/* then wait for it to stabilize */
while (!SLEEP&(XOSC_STB)) {}
/* printf("SLEEP 2 %x\n",SLEEP); */
/* then wait 64uS more */
clock_delay(150);
/* switch to 32MHz clock */
/* printf("switch to 32MHz %x\n",CLKCON); */
CLKCON &= ~(OSC);
/* printf("switched to 32MHz %x\n",CLKCON); */
/* power down 15MHz RC clock */
SLEEP |= OSC_PD;
/* printf("pwr down hfrc\n",SLEEP); */
/* preconfigure adc_dma before calling adc_init if a different dma type is desired. */
if (adc_dma==0xff) {
dma_init();
/* config DMA channel to copy results to single location */
adc_dma=dma_config2(ADC_DMA_CONFIG_CHANNEL, &ADC_SHADOW, DMA_NOINC, adc_dma_dest, DMA_NOINC, 1, 1, DMA_VLEN_LEN, DMA_RPT, DMA_T_ADC_CHALL, 0);
}
}
/* single sample trigger */
void adc_single_shot(void) __banked
{
ADCCON1 |= 0x73;
}
/* convert adc results */
int16_t adc_convert_result(int16_t data) __banked {
data = (0xfffc&data)>>2;
return data;
}
/* read/convert last conversion result */
int16_t adc_get_last_conv() __banked {
int16_t result;
result = (ADCH<<8)|(ADCL);
result = (0xfffc&result)>>2;
return result;
}