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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>
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/* Copyright (c) 2013 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 module for Chrome EC */
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#include "adc.h"
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#include "adc_chip.h"
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#include "common.h"
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#include "console.h"
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#include "util.h"
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/* 'adc' console command is not supported in continuous mode */
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#ifndef CONFIG_ADC_PROFILE_FAST_CONTINUOUS
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static enum adc_channel find_adc_channel_by_name(const char *name)
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{
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const struct adc_t *ch = adc_channels;
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int i;
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if (!name || !*name)
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return ADC_CH_COUNT;
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for (i = 0; i < ADC_CH_COUNT; i++, ch++) {
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if (!strcasecmp(name, ch->name))
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return i;
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}
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return ADC_CH_COUNT;
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}
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static int command_adc(int argc, char **argv)
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{
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int i, v;
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int data[ADC_CH_COUNT];
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/* If a channel is specified, read only that one */
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if (argc == 2) {
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i = find_adc_channel_by_name(argv[1]);
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if (i == ADC_CH_COUNT)
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return EC_ERROR_PARAM1;
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v = adc_read_channel(i);
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if (v == ADC_READ_ERROR)
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return EC_ERROR_UNKNOWN;
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ccprintf(" %s = %d\n", adc_channels[i].name, v);
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return EC_SUCCESS;
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} else {
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/* Otherwise print them all */
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if (adc_read_all_channels(data))
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return EC_ERROR_UNKNOWN;
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for (i = 0; i < ADC_CH_COUNT; ++i)
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ccprintf(" %s = %d\n", adc_channels[i].name, data[i]);
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return EC_SUCCESS;
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}
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}
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DECLARE_CONSOLE_COMMAND(adc, command_adc,
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"[name]",
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"Print ADC channel(s)",
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NULL);
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#endif
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