UART- Particle - Renesas microcontroller

Getting Started
1

Hello guys,

I’m new with the Particle programming… i’m having difficulties when i try to connect my Renesas microcontroller to my Particle throught UART…

I programmed my Renesas controller to send a caracter (each 1 ms ) and i configured the particle to receive this caracter and write it on the serial port (i wanna see it on a Terminal installed on my computer).

20170330_133212.jpg2448×3264 2.74 MB

Real Term Terminal

20170330_133221.jpg3264×2448 2.87 MB

and this is the code i wrote to configure the UART of the Particle:

char Buffer1;

void setup()
{

Serial1.begin(57600); // via TX/RX pins
pinMode(RX,INPUT);
pinMode(TX,OUTPUT);

}

void loop() {

Buffer1=Serial1.read(); // Read whats in the Serial port and store to Buffer
Serial1.print(Buffer1);

}

But the problem is that i can’t see the caracter i sent from the Renesas controller… ???

2

@vannistelkimo, you need to remove the pinMode() statements for RX and TX since these will override the Serial1.begin() pin configuration. Try that and let me know how it works. :slight_smile:

3

@peekay123 Hi, Thanks for your answer… i’m still receiving wrong characters on the Terminal… :slight_smile:

4

@vannistelkimo, try this code:

char Buffer1;

void setup()
{

  Serial1.begin(57600); // via TX/RX pins 

}

void loop() {

  while(Serial1.available()) {
     Buffer1=Serial1.read(); // Read whats in the Serial port and store to Buffer
     Serial1.write(Buffer1);
}
5

Hello @peekay123 , now i can’t see any character on the Terminal… does this means that i’m not receiving any character on the RX of the Particle? and the characters i saw before on the terminal came from where? confused…

6

@vannistelkimo do you have the RX and TX lines crossed between the Renesas and the Photon?

Photon    Renesas
-----------------
RX          TX
TX          RX
7

yes

8

If there is nothing in the RX buffer Serial1.read() will return an int16_t -1 (0xFFFF).

9

@ScruffR, look at the code I provided above.

@vannistelkimo, from your picture, you don’t have the Photon RX connected to anything, only TX!!

1 Like
10

I looked at the code OP provided to answer his question.

1 Like
11

@peekay123
@ScruffR
Hello guys, it’s working now , my mistake was in the Hardware … i thought i connected Rx to TX and TX to RX but it was wrong … Thanks a lot guys , now i can continue my project and send a string from the Renesas controller to a server.

Thanks. :slight_smile:

2 Likes