CODEWITHSUNDEEP
arduinoserial-portstm32uartttl
Peter Boldt
Peter Boldt

Reputation: 73

STM32F103C8T6 (Blue pill) and Arduino nano serial communication

I have a next code in in my Arduino nano:

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3);
void setup()
{
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Native USB only
  }
  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
}

void loop() // run over and over
{
  mySerial.write("Software serial from Arduino Nano\n");
  delay(500);
}

If i connect the D2 and D3 to my TTL, i can read the message at 9600 baud, but if i connect the Tx->Rx and Rx->Tx to my STM32F103C8T6 (Blue pill) with a next code:

#include "stm32f103c8t6.h"
#include "mbed.h"
#include "USBSerial.h"
#include "Crypto.h"

int main() {
    Serial pc(PA_2, PA_3);
    Serial nano(PA_9, PA_10);
while(1) 
    {
     //AES data here

     if(nano.readable()) 
        {
            printf("Nano is here!\n");
            char c[128];
            nano.gets(c, 4);
            printf("I got c line: %s \n", c);
        }
        else
        {
            printf("Nano is unreadable\n");
        }
        wait_ms(1000);
    }
}

On the PA_2, PA_3 is an USB TTL, that send some encrypted data to one PC. The PA_9 and PA10 are connected to Arduino Nano, and i wish to read the data from Nano on the BluePill with this UART, but i always receive that a Nano in unreadable. Have try to change the Tx-Rx wires, but nothing. Why will not work a simultanous use of two serbials?

Upvotes: 0

Views: 1848

Answers (1)

jhoog
jhoog

Reputation: 26

Try setting a baud rate for the Nano on the Blue Pill-it doesn't look like you ever set one in your script. You may also need to include Software Serial like you do on your Nano-the Blue Pill may not have the library it needs otherwise to communicate.

Note, I haven't worked with a Blue Pill before so I'm not sure of how similar or different it is from the Nano.

Upvotes: 0

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