/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2007 by Dave Chapman * * All files in this archive are subject to the GNU General Public License. * See the file COPYING in the source tree root for full license agreement. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "config.h" #include "cpu.h" #include "system.h" #include "kernel.h" #include "thread.h" #include "string.h" #include "adc.h" /* TODO: We probably want to do this on the timer interrupt once we get interrupts going - see the sh-adc.c implementation for an example which looks like it should work well with the TCC77x. */ static unsigned short adcdata[8]; static void adc_do_read(void) { int i; uint32_t adc_status; PCLKCFG6 |= (1<<15); /* Enable ADC clock */ /* Start converting the first 4 channels */ for (i = 0; i < 4; i++) ADCCON = i; /* Wait for data to become stable */ while ((ADCDATA & 0x1) == 0); /* Now read the values back */ for (i=0;i < 4; i++) { adc_status = ADCSTATUS; adcdata[(adc_status >> 16) & 0x7] = adc_status & 0x3ff; } PCLKCFG6 &= ~(1<<15); /* Disable ADC clock */ } unsigned short adc_read(int channel) { adc_do_read(); return adcdata[channel]; } void adc_init(void) { int i; ADCCON = (1<<4); /* Leave standby mode */ ADCCFG |= 0x00000003; /* Single-mode, auto power-down */ }