16F690 and xbee -> usart problem

[raffel0]

Hi all, I linked a Xbee 802.15.4 (series 1) to a 16F690 PIC as you told me some post ago.

Here is the scheme and the photos of the circuit:

**broken link removed**
**broken link removed**
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**broken link removed**



The pic's code (mikroC pro) is the following:

char buff = 0;

void main(){

  ANSEL = 0;
  ANSELH = 0;

UART1_Init(9600); // init USART
Delay_ms(100);


while (1) {                    // Endless loop
   if (UART1_Data_Ready())

   {     // If data is received,
     buff = UART1_Read();     //   read the received data,
     UART1_Write((char)'K');       //   and send data via UART
   }
   
   }
}

With these config bits:

CONFIG   :$2007 : 0x03F4

alias

Internal Rc no clock
Master Clear Enable External
Brown Out Detect Enabled, SBOREN disabled

Xbee modules are able to communicate perfectly (100% success on loopback test via x-ctu) and the pic is able to communicate perfectly in the test via pickit2 on the USART COM port (it answers with the character 'K' to every byte I send).

But as linked above, xbee cannot communicate with the pic and I get 0% success rate in the x-ctu test (always timeout).

Baud rate is 9600 for both of them.

Someone can help me please?

 

[bobcat1]

Hi

Check if you didn't mix TX & RX signal ?

All the best

Bobi

 

[raffel0]

Problem solved bob, the voltage from the xbee (3.3V) was not enough for the pic to "activate" its port.

I solved with a voltage-shifter circuit