Serial Communication between CM-510/BeagleBone Black

[CarAlAg]

Hello.

This is a cry for help.

I'm trying to send a "Hello World" message from the BBB to the CM-510 using the seriallib Robotis provides but I'm not able to achieve anything.

In order to simplify things, right now I'm just trying to send a "Hello World" message from the CM-510 to the hyperterminal through the serial port but it's more of the same. I mean, nothing arrives to the hyperterminal.

Any idea? has anybody had the same issue?

My program is like this (some declarations are unused after):

#include <avr/io.h>
#include <stdio.h>
#include <avr/interrupt.h>
#include "serial.h"
#include "termios.h"
#include "global.h"

void main( void )
{
int x;
unsigned char cosa;
unsigned char *buffer_rec;
unsigned char *buffer_tra;
unsigned char *mensaje="hola_mundoB";

serial_initialize(9600); // USART Initialize
sei();

printf("\n inicializado\n");
_delay_ms(3000);
_delay_ms(5000);

serial_write(mensaje,18);

}

[CarAlAg]

Maybe if anybody can just show me how "serial_read" from the seriallib works I could figure out what I need.

[CarAlAg]

Hello again. Forget abou the previous posts because I think I reached that goal. But the real thing here is that I need help in how to understand and making work a serial connection between a BBB and a CM-510.

Please, help.

[andrefleitao]

Hello CarAlAg

The Beaglebone Black (BBB) uses TTL voltage level signals on its serial ports. It has 6 serial ports: http://beaglebone.cameon.net/home/serial-ports-uart

The CM-510 board has other kind of voltage level signals (RS-232)

You can see here the difference: https://www.sparkfun.com/tutorials/215

This means that you need a level converter to connect BBB to CM-510 through the serial port. Robosavvy sells this one: http://robosavvy.com/store/sparkfun-spa ... r-smd.html

You'd also need a cable to connect to the serial jack on the CM-510.