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imx233/fuze+: implement lradc function and adc on top of it

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30534 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Amaury Pouly 2011-09-13 23:40:09 +00:00
parent 45537a4e87
commit 696b9d146b
6 changed files with 446 additions and 2 deletions
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64
firmware/target/arm/imx233/adc-imx233.c
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@ -23,12 +23,72 @@
#include "adc.h"
#include "adc-target.h"
/* dedicate two channels to temperature sensing
* dedicate channel 7 to battery
* and channel 6 to vddio */
static int pmos_chan, nmos_chan;
static int battery_chan, vddio_chan;
void adc_init(void)
{
imx233_lradc_init();
battery_chan = 7;
imx233_lradc_reserve_channel(7);
vddio_chan = 6;
imx233_lradc_reserve_channel(6);
pmos_chan = imx233_lradc_acquire_channel(0);
if(pmos_chan < 0) panicf("No LRADC channel for PMOS !");
nmos_chan = imx233_lradc_acquire_channel(0);
if(nmos_chan < 0) panicf("No LRADC channel for NMOS !");
// setup them
imx233_lradc_setup_channel(battery_chan, false, false, 0, HW_LRADC_CHANNEL_BATTERY);
imx233_lradc_setup_channel(vddio_chan, false, false, 0, HW_LRADC_CHANNEL_VDDIO);
imx233_lradc_setup_channel(nmos_chan, false, false, 0, HW_LRADC_CHANNEL_NMOS_THIN);
imx233_lradc_setup_channel(pmos_chan, false, false, 0, HW_LRADC_CHANNEL_PMOS_THIN);
}
int adc_read_physical_ex(int virt)
{
imx233_lradc_clear_channel(virt);
imx233_lradc_kick_channel(virt);
imx233_lradc_wait_channel(virt);
int v = imx233_lradc_read_channel(virt);
return v;
}
int adc_read_physical(int src)
{
int virt = imx233_lradc_acquire_channel(TIMEOUT_BLOCK);
// divide by two for wider ranger
imx233_lradc_setup_channel(virt, false, false, 0, src);
int val = adc_read_physical_ex(virt);
imx233_lradc_release_channel(virt);
return val;
}
unsigned short adc_read_virtual(int c)
{
switch(c)
{
case IMX233_ADC_BATTERY:
return adc_read_physical_ex(battery_chan);
case IMX233_ADC_VDDIO:
return adc_read_physical_ex(vddio_chan);
case IMX233_ADC_DIE_TEMP:
// do kelvin to celsius conversion
return imx233_lradc_sense_die_temperature(nmos_chan, pmos_chan) - 273;
default:
return 0;
}
}
unsigned short adc_read(int channel)
{
(void) channel;
return 0;
int c = imx233_adc_mapping[channel];
if(c < 0)
return adc_read_virtual(c);
else
return adc_read_physical(c);
}