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mraa/tools/mraa-uart.c
Manivannan Sadhasivam ec26f92fe6 tools: add new tools directory 
This is the start of the series of commits focussed on
cleaning up the exmaples/ directory.

This commit moves mraa-gpio, mraa-i2c, mraa-uart files
out of examples directory into new tools directory. Moved
files are the good cadidates to be treated as tools
instead of examples.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
2017-11-02 10:00:35 +01:00

302 lines
12 KiB
C
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/*
* Author: Tapani Utriainen <tapani@technexion.com>
* Copyright (c) 2017 TechNexion Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include "mraa.h"
#ifndef FALSE
#define FALSE 0
#define TRUE (!FALSE)
#endif
static const char *undefined = "<undefined>";
static const char paritymode_table[] = {
[MRAA_UART_PARITY_NONE] = 'N',
[MRAA_UART_PARITY_EVEN] = 'E',
[MRAA_UART_PARITY_ODD] = 'O',
[MRAA_UART_PARITY_MARK] = 'M',
[MRAA_UART_PARITY_SPACE] = 'S'
};
/* ------------------------------------------------------------------------ */
mraa_uart_context
uarttool_find(const char *str) {
/* Try to find the uart by name, then by index, by devpath and as last resort create a raw uart */
int uart_index = mraa_uart_lookup(str);
if (uart_index < 0) {
/* name lookup failed, try index if the first character is a digit */
if (isdigit(*str)) {
uart_index = atoi(str);
} else {
const char *devpath;
int number_of_uarts = mraa_get_uart_count();
for (uart_index = 0; uart_index < number_of_uarts; uart_index++) {
mraa_result_t res = mraa_uart_settings(uart_index, NULL, &devpath, NULL, NULL, NULL, NULL, NULL, NULL);
if (res == MRAA_SUCCESS && devpath != NULL && !strcmp(devpath, str)) break;
}
if (uart_index >= number_of_uarts) {
return mraa_uart_init_raw(str);
}
}
}
return mraa_uart_init(uart_index);
}
/* ------------------------------------------------------------------------ */
double
now(void) {
struct timeval tv;
gettimeofday(&tv, NULL);
return (double)tv.tv_usec * 1e-6 + (double)tv.tv_sec;
}
/* ------------------------------------------------------------------------ */
void
uarttool_read_and_print(mraa_uart_context uart, double receive_timeout) {
char buf;
do {
double start = now();
if (mraa_uart_data_available(uart, 1.0 + receive_timeout * 1000.0)) {
mraa_uart_read(uart, &buf, 1);
putchar(buf);
fflush(stdout);
}
receive_timeout -= now() - start;
} while (receive_timeout > 0.0);
}
/* ------------------------------------------------------------------------ */
void
uarttool_usage(const char *name) {
printf("Usage: %s { list | dev device } [ baud bps ] [ databits d ] [ parity p ] [ stopbits s ] [ ctsrts mode ] [ send string ] [ recv timeout ] [ show ]\n\n", name);
printf("Simple tool to test UART functionality. Needs either list or dev arguments, the others are optional\n");
printf(" list : lists uarts on the system (non intrusive)\n");
printf(" dev : select uart device, can be by name, by device name or by index (as listed in list)\n");
printf(" baud : set the baudrate to given parameter, in bits per second\n");
printf(" parity : set parity mode to given parameter - can be E, O, or N\n");
printf(" stopbits : set the number of stopbits - can be 1 or 2\n");
printf(" ctsrts : set CTS/RTS flow control to either on or off\n");
printf(" send : transmits a string\n");
printf(" recv : reads data on uart for timeout seconds, and displays the result on stdout\n");
printf(" show : show settings of selected uart\n");
}
/* ------------------------------------------------------------------------ */
int
main(int argc, const char** argv) {
mraa_uart_context uart = NULL;
int uart_index, i;
int baudrate = 115200, stopbits = 1, databits = 8;
mraa_uart_parity_t parity = MRAA_UART_PARITY_NONE;
unsigned int ctsrts = FALSE, xonxoff = FALSE;
const char *name = NULL, *dev = NULL;
double recieve_timeout = 0.0;
int recieve = FALSE; /* whether we are requested to receive */
int send = FALSE; /* whether we are requested to send or not */
const char *to_send; /* data to send, assigned during parsing of command line */
int show = FALSE; /* whether to show uart settings after everything else*/
/* Initialize MRAA. Init is done automatically if libmraa is compiled
with a compiler that supports __attribute__((constructor)), like
GCC and CLANG
*/
mraa_init();
if (argc <= 1) {
uarttool_usage(argv[0]);
} else
if (!strcmp(argv[1], "list")) {
int number_of_uarts = mraa_get_uart_count();
for (uart_index = 0; uart_index < number_of_uarts; uart_index++) {
mraa_result_t res = mraa_uart_settings(uart_index, &name, &dev, &baudrate, &databits, &stopbits, &parity, &ctsrts, &xonxoff);
if (res == MRAA_SUCCESS) {
if (name == NULL) name = undefined;
if (dev == NULL) dev = undefined;
printf("%i. %-12s %-16s %7i %i%c%i %s %s\n", uart_index, name, dev, baudrate, databits, paritymode_table[parity], stopbits, ctsrts?"CTSRTS":"(none)", xonxoff?"XONXOFF":"(none) ");
} else {
printf("%i. ---- error reading uart information ----\n", uart_index);
}
}
} else {
for (i=1; i<argc; i++) {
if (!strcmp(argv[i], "dev")) {
uart = uarttool_find(argv[i+1]);
if (uart == NULL) {
fprintf(stderr, "%s : cannot find uart %s\n", argv[0], argv[i+1]);
break;
}
dev = mraa_uart_get_dev_path(uart);
mraa_result_t res = mraa_uart_settings(-1, &dev, &name, &baudrate, &databits, &stopbits, &parity, &ctsrts, &xonxoff);
if (res != MRAA_SUCCESS) {
fprintf(stderr, "warning: problems accessing uart settings, attempting to continue\n");
}
} else
/* Baudrate setting */
if (!strcmp(argv[i], "baud") || !strcmp(argv[i], "baudrate")) {
if (i+1 >= argc || !isdigit(argv[i+1][0])) {
fprintf(stderr, "%s : %s needs number as argument\n", argv[0], argv[i]);
break;
}
baudrate = atoi(argv[i+1]);
if (uart != NULL) {
mraa_uart_set_baudrate(uart, baudrate);
}
i++;
} else
/* Accept a few variants of the flow control setting name */
if (!strcmp(argv[i], "ctsrts") || !strcmp(argv[i], "rtscts") || !strcmp(argv[i], "crtscts")) {
if (i+1 >= argc || argv[i+1][0] != 'o') {
fprintf(stderr, "%s : ctsrts needs either on or off as argument\n", argv[0]);
break;
}
ctsrts = !strcmp(argv[i+1], "on") ? 1u : 0u;
xonxoff = 0u;
if (uart != NULL) {
mraa_uart_set_flowcontrol(uart, xonxoff, ctsrts);
}
i++;
} else
/* Number of stopbits */
if (!strcmp(argv[i], "stopbits")) {
if (i+1 >= argc || !isdigit(argv[i+1][0])) {
fprintf(stderr, "%s : %s needs number as argument\n", argv[0], argv[i]);
break;
}
stopbits = atoi(argv[i+1]);
if (stopbits < 1 || stopbits > 2) {
stopbits = 1;
fprintf(stderr, "%s : invalid number of stopbits, bust be 1 or 2\n", argv[0]);
}
if (uart != NULL) {
mraa_uart_set_mode(uart, databits, parity, stopbits);
}
i++;
} else
/* Databits */
if (!strcmp(argv[i], "databits") || !strcmp(argv[i], "bytesize")) {
if (i+1 >= argc || !isdigit(argv[i+1][0])) {
fprintf(stderr, "%s : %s needs number as argument\n", argv[0], argv[i]);
break;
}
databits = atoi(argv[i+1]);
if (uart != NULL) {
mraa_uart_set_mode(uart, databits, parity, stopbits);
}
i++;
} else
/* Parity mode, uses paritmode array */
if (!strcmp(argv[i], "paritybits") || !strcmp(argv[i], "parity")) {
int j;
if (i+1 >= argc) {
fprintf(stderr, "%s : %s needs 'O','E' or 'N' as argument\n", argv[0], argv[i]);
break;
}
/* Even if there were gaps between declared array elements, they would be initialized to 0 compile time */
for (j=0; j<sizeof(paritymode_table); j++) {
if (paritymode_table[j] == toupper(argv[i+1][0])) {
parity = j;
break;
}
}
if (j >= sizeof(paritymode_table)) {
fprintf(stderr, "warning: unrecognized parity mode %s (ignoring)\n", argv[i+1]);
}
if (uart != NULL) {
mraa_uart_set_mode(uart, databits, parity, stopbits);
}
i++;
} else
/* Show settings */
if (!strcmp(argv[i], "show")) {
show = TRUE;
} else
/* Send data */
if (!strcmp(argv[i], "send")) {
if (i+1 >= argc) {
fprintf(stderr, "%s : %s needs string as argument\n", argv[0], argv[i]);
break;
}
send = TRUE;
to_send = argv[i+1];
i++;
} else
if (!strcmp(argv[i], "receive") || !strcmp(argv[i], "recieve") || !strcmp(argv[i], "recv")) {
if (i+1 >= argc) {
fprintf(stderr, "%s : %s needs a timeout (in seconds, fractional ok) as argument\n", argv[0], argv[i]);
break;
}
recieve = TRUE;
recieve_timeout = atof(argv[i+1]);
i++;
}
}
if (i == argc && uart != NULL) {
if (send) {
mraa_uart_write(uart, to_send, strlen(to_send)+1);
}
if (recieve) {
uarttool_read_and_print(uart, recieve_timeout);
}
if (show) {
if (recieve) putchar('\n');
dev = mraa_uart_get_dev_path(uart);
mraa_uart_settings(-1, &dev, &name, &baudrate, &databits, &stopbits, &parity, &ctsrts, &xonxoff);
printf("%-12s %-16s %7i %i%c%i %s %s\n", name!=NULL?name:undefined, dev, baudrate, databits, paritymode_table[parity], stopbits, ctsrts?"CTS/RTS":"(no hw)", xonxoff?"XONXOFF":"(no sw)");
}
} else {
uarttool_usage(argv[0]);
}
}
mraa_deinit();
return EXIT_SUCCESS;
}
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