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add the ADC driver for the Gigabeat

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11089 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Marcoen Hirschberg 2006-09-29 10:52:34 +00:00
parent ceac1733c5
commit 3496689c8e
2 changed files with 79 additions and 0 deletions
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1
firmware/SOURCES
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@ -301,6 +301,7 @@ target/arm/gigabeat/meg-fx/power-meg-fx.c
target/arm/gigabeat/meg-fx/usb-meg-fx.c
target/arm/gigabeat/meg-fx/lcd-meg-fx.c
target/arm/gigabeat/meg-fx/sc606-meg-fx.c
target/arm/gigabeat/meg-fx/adc-meg-fx.c
#endif
#endif

78
firmware/target/arm/gigabeat/meg-fx/adc-meg-fx.c Normal file
View file

@ -0,0 +1,78 @@
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Wade Brown
*
* 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 "cpu.h"
#include "adc-target.h"
void adc_init(void) {
/* Turn on the ADC PCLK */
CLKCON |= (1<<15);
/* Set channel 0, normal mode, disable "start by read" */
ADCCON &= ~(0x3F);
/* No start delay. Use nromal conversion mode. */
ADCDLY |= 0x1;
/* Set and enable the prescaler */
ADCCON = (ADCCON & ~(0xff<<6)) | (0x19<<6);
ADCCON |= (1<<14);
}
unsigned short adc_read(int channel) {
int i;
/* Set the channel */
ADCCON = (ADCCON & ~(0x7<<3)) | (channel<<3);
/* Start the conversion process */
ADCCON |= 0x1;
/* Wait for a low Enable_start */
i = 20000;
while(i > 0) {
if(ADCCON & 0x1) {
i--;
}
else {
break;
}
}
if(i == 0) {
/* Ran out of time */
return(0);
}
/* Wait for high End_of_Conversion */
i = 20000;
while(i > 0) {
if(ADCCON & (1<<15)) {
break;
}
else {
i--;
}
}
if(i == 0) {
/* Ran out of time */
return(0);
}
return(ADCDAT0 & 0x3ff);
}