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