libsigrok/hardware/conrad-digi-35-cpu/protocol.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2014 Matthias Heidbrink <m-sigrok@heidbrink.biz>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file
* <em>Conrad DIGI 35 CPU</em> power supply driver
* @internal
*/
#include "protocol.h"
/**
* Send command with parameter.
*
* @param[in] cmd Command
* @param[in] param Parameter (0..999, depending on command).
*
* @retval SR_OK Success.
* @retval SR_ERR_ARG Invalid argument.
* @retval SR_ERR Error.
*/
SR_PRIV int send_msg1(const struct sr_dev_inst *sdi, char cmd, int param)
{
struct sr_serial_dev_inst *serial;
char buf[5];
if (!sdi || !(serial = sdi->conn))
return SR_ERR_ARG;
snprintf(buf, sizeof(buf), "%c%03d", cmd, param);
buf[4] = '\r';
sr_spew("send_msg1(): %c%c%c%c\\r", buf[0], buf[1], buf[2], buf[3]);
if (serial_write(serial, buf, sizeof(buf)) == -1) {
sr_err("Write error for cmd=%c: %d %s", cmd, errno, strerror(errno));
return SR_ERR;
}
/*
* Wait 50ms to ensure that the device does not swallow any of the
* following commands.
*/
g_usleep(50000);
return SR_OK;
}