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uartat is the underlying UART driver, specifically for use with AT-style command driven devices like modems. The le910 support is provided in the form of examples that make use of the uartat driver to interact with the device. Signed-off-by: Jon Trulson <jtrulson@ics.com>
170 lines
5.6 KiB
C
170 lines
5.6 KiB
C
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2017 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <unistd.h>
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#include "uartat.h"
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#include "upm_utilities.h"
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const size_t bufferLength = 256;
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int main(int argc, char **argv)
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{
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//! [Interesting]
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char *defaultDev = "/dev/ttyUSB0";
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if (argc > 1)
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defaultDev = argv[1];
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printf("Using device: %s\n", defaultDev);
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// Instantiate a UARTAT sensor on defaultDev at 115200 baud.
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uartat_context sensor = uartat_init_tty(defaultDev, 115200);
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if (!sensor)
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{
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printf("uartat_init_tty() failed.\n");
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return 1;
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}
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// This is a simplistic example that tries to configure the LE910,
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// and use it's built-in socket capabilities to connect to a
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// remote host, obtain a small piece of data, and return it. It's
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// mainly intended to show you how you can use the various AT
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// commands supported by the LE910 to perform simple tasks.
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//
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// You must have a valid SIM card with an active data plan for
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// this example to do anything interesting.
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//
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// See the LE910 AT Commands reference for full information on
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// what is possible with this device. The uartat driver is
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// intended to make it a little easier to control AT-style
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// devices, but is by no means a full-featured communication
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// infrastructure. A "real" application will probably need to be
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// much more sophisticated, and custom designed for the desired
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// task.
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//
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// For experimenting with various AT commands, try using an
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// interactive terminal emulator like minicom or screen.
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char buffer[bufferLength];
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// make sure we are in command mode
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if (!uartat_in_command_mode(sensor))
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{
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printf("Not in command mode, switching...\n");
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uartat_command_mode(sensor, "+++", 1000);
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}
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// flter out CR's in responses by default
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uartat_filter_cr(sensor, true);
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printf("Configuring modem...\n");
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// discard any waiting characters
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uartat_drain(sensor);
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// reset modem
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uartat_command(sensor, "ATZ\r");
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// turn off command echo, set verbosity to 1, enable data
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// connection mode
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uartat_command(sensor, "ATE0 V1 +FCLASS=0\r");
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uartat_drain(sensor);
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// Now issue some commands and output the results.
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printf("Modem and SIM information:\n");
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if (uartat_command_with_response(sensor, "AT+ICCID\r",
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buffer, bufferLength))
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printf("ICCID (SIM ID): %s\n", buffer);
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if (uartat_command_with_response(sensor, "AT+CGSN=1\r",
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buffer, bufferLength))
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printf("IMEI: %s\n", buffer);
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// see if we are on the network....
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if (uartat_command_with_response(sensor, "AT+CREG?\r",
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buffer, bufferLength))
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{
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printf("%s\n", buffer);
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// look for "CGREG: 0,1" or "CGREG: 0,5"
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if (uartat_find(sensor, buffer, "CREG: 0,1") ||
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uartat_find(sensor, buffer, "CREG: 0,5"))
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{
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printf("Connected to the cell data network.\n");
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// wait up to 5 seconds for responses now...
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uartat_set_response_wait_time(sensor, 5000);
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// setup PDP context (socket 1). An ERROR response is
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// possible if the PDP context is already set up.
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uartat_command(sensor, "AT#SGACT=1,1\r");
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// setup a TCP socket to nist.gov and read the timestamp.
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printf("Connecting to time-a.nist.gov, TCP port 13\n");
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// Wait up to 60 seconds to find the NO CARRIER
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// string, which will be present at the end, if the
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// connection succeeded and the requested data was
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// obtained.
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if (uartat_command_waitfor(sensor,
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"AT#SD=1,0,13,\"time-a.nist.gov\"\r",
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buffer, bufferLength,
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"\nNO CARRIER\n", 60000))
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{
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// print out the response
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printf("RESPONSE:\r%s\r", buffer);
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}
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else
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{
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printf("No response.\n");
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}
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// destroy PDP context
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uartat_set_response_wait_time(sensor, 250);
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uartat_command(sensor, "AT#SGACT=1,0\r");
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}
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else
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{
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printf("You do not appear to be connected to the network...\n");
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}
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}
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else
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{
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printf("Error executing query\n");
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}
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// reset the modem
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uartat_command(sensor, "ATZ\r");
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printf("Exiting\n");
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uartat_close(sensor);
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//! [Interesting]
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return 0;
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}
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