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drivers/adc: provide API to access reference voltage

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Required for any real-world use of ADC_REF_INTERNAL.

Relates-to: issue #11922
Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This commit is contained in:
Peter A. Bigot 2019-07-29 09:35:33 -05:00 • committed by Carles Cufí
commit 5a39bcae84
3 changed files with 20 additions and 0 deletions
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1
drivers/adc/adc_nrfx_adc.c
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@ -274,6 +274,7 @@ static const struct adc_driver_api adc_nrfx_driver_api = {
#ifdef CONFIG_ADC_ASYNC #ifdef CONFIG_ADC_ASYNC
.read_async = adc_nrfx_read_async, .read_async = adc_nrfx_read_async,
#endif #endif
.ref_internal = 1200,
}; };
#ifdef CONFIG_ADC_0 #ifdef CONFIG_ADC_0

1
drivers/adc/adc_nrfx_saadc.c
View file

@ -406,6 +406,7 @@ static const struct adc_driver_api adc_nrfx_driver_api = {
#ifdef CONFIG_ADC_ASYNC #ifdef CONFIG_ADC_ASYNC
.read_async = adc_nrfx_read_async, .read_async = adc_nrfx_read_async,
#endif #endif
.ref_internal = 600,
}; };
#ifdef CONFIG_ADC_0 #ifdef CONFIG_ADC_0

18
include/drivers/adc.h
View file

@ -302,6 +302,7 @@ struct adc_driver_api {
#ifdef CONFIG_ADC_ASYNC #ifdef CONFIG_ADC_ASYNC
adc_api_read_async read_async; adc_api_read_async read_async;
#endif #endif
u16_t ref_internal; /* mV */
}; };
/** /**
@ -394,6 +395,23 @@ static inline int z_impl_adc_read_async(struct device *dev,
} }
#endif /* CONFIG_ADC_ASYNC */ #endif /* CONFIG_ADC_ASYNC */
/**
* @brief Get the internal reference voltage.
*
* Returns the voltage corresponding to @ref ADC_REF_INTERNAL,
* measured in millivolts.
*
* @return a positive value is the reference voltage value. Returns
* zero if reference voltage information is not available.
*/
static inline u16_t adc_ref_internal(struct device *dev)
{
const struct adc_driver_api *api =
(const struct adc_driver_api *)dev->driver_api;
return api->ref_internal;
}
#include <syscalls/adc.h> #include <syscalls/adc.h>
/** /**