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#include <linux/serial.h>
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2
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#include <stdio.h>
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3
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#include <stdlib.h>
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4
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#include <fcntl.h>
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5
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#include <termios.h>
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7
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/* Driver-specific ioctls: */
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#define TIOCGRS485 0x542E
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#define TIOCSRS485 0x542F
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10
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11
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/* new defines in linux/serial.h of CL provided kernel */
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#ifndef SER_RS485_USE_GPIO
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#define SER_RS485_USE_GPIO (1<<5)
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#define gpio_pin padding[0]
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15
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#endif
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16
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/* Convert GPIO signal to GPIO pin number */
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#define GPIO_TO_PIN(bank, gpio) (32 * (bank) + (gpio))
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19
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20
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#define GATERO_UART1_RS485EN GPIO_TO_PIN(0,12)
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#define GATERO_UART2_RS485EN GPIO_TO_PIN(0,13)
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#define GATERO_UART3_RS485EN GPIO_TO_PIN(1,31)
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#define GATERO_UART4_RS485EN GPIO_TO_PIN(1,30)
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25
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26
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/*
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* Test program for 485 control
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*/
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int main(int argc, char* argv[])
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{
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struct serial_rs485 rs485conf;
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char buffer[20], buffer2[21],uartname[10];
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int i, rv, opt, uartnr,gpio_txen;
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struct termios my_termios, new_termios;
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if (argc > 1)
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{
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uartnr = atoi(argv[1]);
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sprintf(uartname, "/dev/ttyO%d", uartnr);
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switch(uartnr)
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{
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case 1: gpio_txen = GATERO_UART1_RS485EN; break;
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case 2: gpio_txen = GATERO_UART2_RS485EN; break;
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case 3: gpio_txen = GATERO_UART3_RS485EN; break;
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case 4: gpio_txen = GATERO_UART4_RS485EN; break;
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default: printf("The command had out of range uartNr: Only 1 to 4 available.\n"); exit(1);
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47
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}
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}
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else
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{
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printf("The command had no other arguments. Usage: %s uartNr\n", argv[0]); exit(1);
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}
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53
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int fd0 = open(uartname, O_RDWR | O_NDELAY | O_NOCTTY);
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rs485conf.flags = (1<<0); //SER_RS485_ENABLED;
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rs485conf.flags |= SER_RS485_USE_GPIO;
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rs485conf.delay_rts_before_send = 0;
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rs485conf.gpio_pin = gpio_txen;
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rv = ioctl (fd0, TIOCSRS485, &rs485conf);
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if (rv) {
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printf("rv = %d\n", rv);
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perror("unable to set IOCTL:");
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}
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tcgetattr(fd0, &my_termios);
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my_termios.c_iflag &= ~(IGNBRK | BRKINT | ICRNL | INLCR | PARMRK | INPCK | ISTRIP | IXON);
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my_termios.c_oflag &= ~(OCRNL | ONLCR | ONLRET | ONOCR | OFILL | OLCUC | OPOST);
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my_termios.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN | ISIG | ECHOK | ECHOCTL | ECHOPRT);
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my_termios.c_cflag &= ~(CSIZE | PARENB);
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my_termios.c_cflag &= ~CRTSCTS;
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my_termios.c_cflag |= CS8 | CLOCAL;
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my_termios.c_cflag &= ~CBAUD;
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my_termios.c_cflag |= B115200; //B115200; // B19200; //
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my_termios.c_cc[VMIN] = 1;
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my_termios.c_cc[VTIME] = 0;
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rv = tcsetattr(fd0, TCSANOW, &my_termios);
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tcgetattr(fd0, &new_termios);
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80
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81
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for (i = 0; i < 20; i++) {
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buffer[i] = 'A'+i;
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}
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85
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for (i = 0; i < 1; i++) {
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printf("Writing [%d]\n", i);
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write(fd0, buffer, 15);
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sleep(1);
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}
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close(fd0);
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}
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