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ADC wrapper for the Zoul-based platforms, allows to add analogue sensors over the existing adc interface

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This commit is contained in:
Antonio Lignan 2016-01-12 01:04:21 +01:00
parent 66719ef2e2
commit 503abb4415
13 changed files with 678 additions and 19 deletions
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37
platform/zoul/dev/adc-sensors.c
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@ -45,9 +45,16 @@
#include "dev/adc.h"
#include "adc-sensors.h"
#include "zoul-sensors.h"
#include <stdio.h>
#include <stdint.h>
/*---------------------------------------------------------------------------*/
#define DEBUG 1
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static uint8_t decimation_rate;
static uint8_t enabled_channels;
/*---------------------------------------------------------------------------*/
@ -80,6 +87,12 @@ get_channel_pin(int type)
if((ZOUL_SENSORS_ADC3) && (type == ZOUL_SENSORS_ADC3)) {
return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC3_PIN;
}
if((ZOUL_SENSORS_ADC4) && (type == ZOUL_SENSORS_ADC4)) {
return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC4_PIN;
}
if((ZOUL_SENSORS_ADC5) && (type == ZOUL_SENSORS_ADC5)) {
return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC5_PIN;
}
return ZOUL_SENSORS_ERROR;
}
/*---------------------------------------------------------------------------*/
@ -90,16 +103,24 @@ value(int type)
int16_t res;
if(!(type & enabled_channels)) {
PRINTF("ADC: channel not enabled\n");
return ZOUL_SENSORS_ERROR;
}
channel = get_channel_pin(type);
if(channel == ZOUL_SENSORS_ERROR) {
PRINTF("ADC: pin not active\n");
return ZOUL_SENSORS_ERROR;
}
res = adc_get(channel, SOC_ADC_ADCCON_REF_AVDD5, decimation_rate);
res = adc_get(channel, ADC_SENSORS_REFERENCE, decimation_rate);
/* Only allow negative values if using differential input */
if((ADC_SENSORS_REFERENCE != SOC_ADC_ADCCON_REF_EXT_DIFF) && (res < 0)) {
res = 0;
}
return res;
}
/*---------------------------------------------------------------------------*/
@ -111,12 +132,14 @@ configure(int type, int value)
/* This should filter out disabled sensors as its value should be zero */
if((value < ZOUL_SENSORS_ADC_MIN) || (value > ZOUL_SENSORS_ADC_ALL)) {
PRINTF("ADC: invalid adc pin mask (0x%02X)\n", value);
return ZOUL_SENSORS_ERROR;
}
if((value != ZOUL_SENSORS_ADC1) && (value != ZOUL_SENSORS_ADC2) &&
(value != ZOUL_SENSORS_ADC3) && (value != ZOUL_SENSORS_ADC12) &&
(value != ZOUL_SENSORS_ADC13) && (value != ZOUL_SENSORS_ADC23)) {
(value != ZOUL_SENSORS_ADC3) && (value != ZOUL_SENSORS_ADC4) &&
(value != ZOUL_SENSORS_ADC5)) {
PRINTF("ADC: invalid adc pin mask\n");
return ZOUL_SENSORS_ERROR;
}
@ -132,6 +155,12 @@ configure(int type, int value)
if(value & ZOUL_SENSORS_ADC3) {
ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC3_PIN, IOC_OVERRIDE_ANA);
}
if(value & ZOUL_SENSORS_ADC4) {
ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC4_PIN, IOC_OVERRIDE_ANA);
}
if(value & ZOUL_SENSORS_ADC5) {
ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC5_PIN, IOC_OVERRIDE_ANA);
}
adc_init();
set_decimation_rate(SOC_ADC_ADCCON_DIV_512);
enabled_channels = value;