Development Preparation
- SSH Tools
We recommend using MobaXterm, or you can choose your preferred SSH tool.
https://iotrouter.yuque.com/attachments/yuque/0/2025/zip/40387797/1751447985727-10cb8014-e57d-4f95-85f2-722b2f822d6f.zip
2. Serial port debugging tool
We recommend using XCOM, or choose your preferred serial port debugging tool
https://iotrouter.yuque.com/attachments/yuque/0/2025/zip/40387797/1751448098345-cc351ada-aa82-4de7-b0bf-b6a909e637bc.zip
3. Hardware Tools
Common debugging tools include: CAN-to-USB tools / 485-to-USB tools / network cables, etc. Please prepare these on your own.
4. Cross-Compilation Toolchain
https://iotrouter.yuque.com/attachments/yuque/0/2025/tar/40387797/1751447691686-3001e3bf-2f16-43d3-a4d7-55c4705dff97.tar
Software Environment
OS: Ubuntu 20.04.1; partially cropped
NodeJs: v22.16.0
Python: python3.8
Shell: bash
GLIBC: 2.31
Peripheral Interfaces
1. Serial Port
The EC100 comes with two built-in RS485 transceivers.
Note: With RS485 transmission and reception, users do not need to worry about switching between transmission and reception, as the hardware will handle it automatically.
1.1. Quick test
Use the minicom tool for testing. For specific usage instructions, please search Baidu or consult DeepSeek.
1.2. Code test example
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <errno.h>
#include <sys/select.h>
#define BUFFER_SIZE 256
typedef struct {
int baud_rate; // Baud rate
int data_bits; // Data bits (5,6,7,8)
int stop_bits; // Stop bits (1,2)
char parity; // Parity bit (N: No parity, O: Odd parity, E: Even parity)
} SerialConfig;
int set_serial_attr(int fd, SerialConfig *config)
{
struct termios tty;
if (tcgetattr(fd, &tty) < 0) {
perror(“tcgetattr”);
return -1;
}
// Set baud rate
speed_t speed;
switch (config->baud_rate) {
case 9600: speed = B9600; break;
case 19200: speed = B19200; break;
case 38400: speed = B38400; break;
case 57600: speed = B57600; break;
case 115200: speed = B115200; break;
default:
fprintf(stderr, “Unsupported baud rate, using 115200\n”);
speed = B115200;
}
cfsetispeed(&tty, speed);
cfsetospeed(&tty, speed);
// Set data bits
tty.c_cflag &= ~CSIZE;
switch (config->data_bits) {
case 5: tty.c_cflag |= CS5; break;
case 6: tty.c_cflag |= CS6; break;
case 7: tty.c_cflag |= CS7; break;
case 8: tty.c_cflag |= CS8; break;
default:
fprintf(stderr, “Unsupported data bits, using 8\n”);
tty.c_cflag |= CS8;
}
// Set stop bit
if (config->stop_bits == 2) {
tty.c_cflag |= CSTOPB;
} else {
tty.c_cflag &= ~CSTOPB;
}
// Set the check digit
switch (config->parity) {
case ‘N’: case ‘n’:
tty.c_cflag &= ~PARENB; // No verification
break;
case ‘O’: case ‘o’:
tty.c_cflag |= PARENB; // Odd parity check
tty.c_cflag |= PARODD;
break;
case ‘E’: case ‘e’:
tty.c_cflag |= PARENB; // Parity check
tty.c_cflag &= ~PARODD;
break;
default:
fprintf(stderr, “Unsupported parity, using N\n”);
tty.c_cflag &= ~PARENB;
}
// Other settings
tty.c_cflag |= (CLOCAL | CREAD); // Enable receive and local mode
tty.c_cflag &= ~CRTSCTS; // No hardware flow control
tty.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // Original input mode
tty.c_oflag &= ~OPOST; // Original output mode
tty.c_cc[VMIN] = 1; // Minimum number of characters read
tty.c_cc[VTIME] = 0; // Read timeout (unit: 0.1 seconds)
if (tcsetattr(fd, TCSANOW, &tty) < 0) {
perror(“tcsetattr”);
return -1;
}
return 0;
}
int main(int argc, char *argv[])
{
int fd;
char *portname;
if (argc < 2) {
fprintf(stderr, “Usage: %s <serial_port>\n”, argv[0]);
exit(EXIT_FAILURE);
}
portname = argv[1];
// Configure serial port parameters
SerialConfig config = {
.baud_rate = 115200, // 波特率
.data_bits = 8, // 数据位
.stop_bits = 1, // 停止位
.parity = ‘N’ // 校验位 (N:无校验, O:奇校验, E:偶校验)
};
fd = open(portname, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fd < 0) {
perror(“open”);
exit(EXIT_FAILURE);
}
if (set_serial_attr(fd, &config)) {
close(fd);
exit(EXIT_FAILURE);
}
printf(“Serial port echo test running on %s\n”, portname);
printf(“Configuration: %d baud, %d data bits, %d stop bit, %c parity\n”,
config.baud_rate, config.data_bits, config.stop_bits, config.parity);
printf(“Press Ctrl+C to exit.\n”);
fd_set readfds;
char buffer[BUFFER_SIZE];
int n;
while (1) {
FD_ZERO(&readfds);
FD_SET(fd, &readfds);
// 无限等待数据到达（移除了超时设置）
if (select(fd + 1, &readfds, NULL, NULL, NULL) < 0) {
perror(“select”);
break;
}
if (FD_ISSET(fd, &readfds)) {
n = read(fd, buffer, BUFFER_SIZE – 1);
if (n > 0) {
buffer[n] = ‘\0’;
printf(“Received %d bytes: %s\n”, n, buffer);
// 回显数据
write(fd, buffer, n);
} else if (n < 0) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
perror(“read”);
break;
}
}
}
}
close(fd);
return 0;
}
