77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 by Dave Chapman
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "kernel.h"
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#include "thread.h"
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#include "string.h"
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#include "adc.h"
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/*
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TODO: We probably want to do this on the timer interrupt once we get
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interrupts going - see the sh-adc.c implementation for an example which
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looks like it should work well with the TCC77x.
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Also, this code is practically identical between 77x & 780x targets.
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Should probably find a common location to avoid the duplication.
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*/
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static unsigned short adcdata[8];
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static void adc_do_read(void)
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{
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int i;
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uint32_t adc_status;
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PCLK_ADC |= PCK_EN; /* Enable ADC clock */
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/* Start converting the first 4 channels */
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for (i = 0; i < 4; i++)
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ADCCON = i;
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/* Wait for data to become stable */
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while ((ADCDATA & 0x1) == 0);
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/* Now read the values back */
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for (i=0;i < 4; i++) {
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adc_status = ADCSTATUS;
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adcdata[(adc_status >> 16) & 0x7] = adc_status & 0x3ff;
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}
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PCLK_ADC &= ~PCK_EN; /* Disable ADC clock */
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}
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unsigned short adc_read(int channel)
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{
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/* Either move this to an interrupt routine, or only perform the read if
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the last call was X length of time ago. */
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adc_do_read();
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return adcdata[channel];
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}
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void adc_init(void)
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{
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/* consider configuring PCK_ADC source here */
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ADCCON = (1<<4); /* Leave standby mode */
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ADCCFG |= 0x00000003; /* Single-mode, auto power-down */
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}
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