2 * This file is part of the libsigrok project.
4 * Copyright (C) 2016 Lars-Peter Clausen <lars@metafoo.de>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 * Software limits helper functions
31 #include <libsigrok/libsigrok.h>
32 #include "libsigrok-internal.h"
35 * Initialize a software limit instance
37 * Must be called before any other operations are performed on a struct
38 * sr_sw_limits and should typically be called after the data structure has been
41 * @param limits the software limit instance to initialize
43 SR_PRIV void sr_sw_limits_init(struct sr_sw_limits *limits)
45 limits->limit_samples = 0;
46 limits->limit_msec = 0;
50 * Get software limit configuration
52 * Retrieve the currently configured software limit for the specified key.
53 * Should be called from the drivers config_get() callback.
55 * @param limits software limit instance
56 * @param key config item key
57 * @param data config item data
58 * @return SR_ERR_NA if @p key is not a supported limit, SR_OK otherwise
60 SR_PRIV int sr_sw_limits_config_get(struct sr_sw_limits *limits, uint32_t key,
64 case SR_CONF_LIMIT_SAMPLES:
65 *data = g_variant_new_uint64(limits->limit_samples);
67 case SR_CONF_LIMIT_MSEC:
68 *data = g_variant_new_uint64(limits->limit_msec / 1000);
78 * Set software limit configuration
80 * Configure software limit for the specified key. Should be called from the
81 * drivers config_set() callback.
83 * @param limits software limit instance
84 * @param key config item key
85 * @param data config item data
86 * @return SR_ERR_NA if @p key is not a supported limit, SR_OK otherwise
88 SR_PRIV int sr_sw_limits_config_set(struct sr_sw_limits *limits, uint32_t key,
92 case SR_CONF_LIMIT_SAMPLES:
93 limits->limit_samples = g_variant_get_uint64(data);
95 case SR_CONF_LIMIT_MSEC:
96 limits->limit_msec = g_variant_get_uint64(data) * 1000;
106 * Start a new data acquisition session
108 * Resets the internal accounting for all software limits. Usually should be
109 * called from the drivers acquisition_start() callback.
111 * @param limits software limits instance
113 SR_PRIV void sr_sw_limits_acquisition_start(struct sr_sw_limits *limits)
115 limits->samples_read = 0;
116 limits->start_time = g_get_monotonic_time();
120 * Check if any of the configured software limits has been reached
122 * Usually should be called at the end of the drivers work function after all
123 * processing has been done.
125 * @param limits software limits instance
126 * @returns TRUE if any of the software limits has been reached and the driver
127 * should stop data acquisition, otherwise FALSE.
129 SR_PRIV gboolean sr_sw_limits_check(struct sr_sw_limits *limits)
131 if (limits->limit_samples) {
132 if (limits->samples_read >= limits->limit_samples)
136 if (limits->limit_msec) {
138 now = g_get_monotonic_time();
139 if (now > limits->start_time &&
140 now - limits->start_time > limits->limit_msec)
148 * Update the amount samples that have been read
150 * Update the amount of samples that have been read in the current data
151 * acquisition run. For each invocation @p samples_read will be accumulated and
152 * once the configured sample limit has been reached sr_sw_limits_check() will
155 * @param limits software limits instance
156 * @param samples_read the amount of samples that have been read
158 SR_PRIV void sr_sw_limits_update_samples_read(struct sr_sw_limits *limits,
159 uint64_t samples_read)
161 limits->samples_read += samples_read;