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8038e5f146
Add support for continuously writing ADC samples to a circular buffer. CONFIG_ADC_PROFILE_FAST_CONTINUOUS should be defined and an appropriate sized buffer must be passed to adc_read_all_channels(). BUG=chromium:569994 TEST=Manual on snoball. Verify 'adc' continues to function (single mode). With pending commit, verify that continuous conversion interrupt is called at appropriate frequency and values look consistent. BRANCH=None Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: I025825d72a698f8f1f4f95a89477df791bd5e67e Reviewed-on: https://chromium-review.googlesource.com/318505 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* ADC interface for Chrome EC */
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#ifndef __CROS_EC_ADC_H
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#define __CROS_EC_ADC_H
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#include "common.h"
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#define HOOK_PRIO_INIT_ADC HOOK_PRIO_DEFAULT /* ADC priority */
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#define ADC_READ_ERROR -1 /* Value returned by adc_read_channel() on error */
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/*
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* Boards which use the ADC interface must provide enum adc_channel in the
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* board.h file. See chip/$CHIP/adc_chip.h for additional chip-specific
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* requirements.
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*/
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/**
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* Read an ADC channel.
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*
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* @param ch Channel to read
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*
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* @return The scaled ADC value, or ADC_READ_ERROR if error.
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*/
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int adc_read_channel(enum adc_channel ch);
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/**
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* Read all ADC channels.
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*
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* @param data Destination array for channel data; must be
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* ADC_CH_COUNT elements long for single-read profile,
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* or sized according to dma_buffer_size in
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* continuous profiles.
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*
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* @return EC_SUCCESS, or non-zero on error.
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*/
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int adc_read_all_channels(int *data);
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/**
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* Enable ADC watchdog. Note that interrupts might come in repeatedly very
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* quickly when ADC output goes out of the accepted range.
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*
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* @param ain_id The AIN to be watched by the watchdog.
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* @param high The high threshold that the watchdog would trigger
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* an interrupt when exceeded.
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* @param low The low threshold.
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*
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* @return EC_SUCCESS, or non-zero if any error.
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*/
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int adc_enable_watchdog(int ain_id, int high, int low);
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/**
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* Disable ADC watchdog.
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*
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* @return EC_SUCCESS, or non-zero if any error.
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*/
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int adc_disable_watchdog(void);
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/**
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* Set the delay between ADC watchdog samples. This can be used as a trade-off
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* of power consumption and performance.
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*
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* @param delay_ms The delay in milliseconds between two ADC watchdog
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* samples.
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*
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* @return EC_SUCCESS, or non-zero if any error or not supported.
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*/
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int adc_set_watchdog_delay(int delay_ms);
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#endif /* __CROS_EC_ADC_H */
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