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Maple mini with USB serial in Arduino fails

I’m trying to port a small application that works fine under the original Arduino IDE, but I’m not able to get it working on Platformio.

#include <Arduino.h>
#define ARDUINOJSON_ENABLE_PROGMEM 0
#include <ArduinoJson.h>
#include <stdint.h>

StaticJsonDocument<2000> jsonDoc;
#define LED_BUILTIN PB1

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(115200);
    while (!Serial)
  {
    digitalWrite(LED_BUILTIN,!digitalRead(LED_BUILTIN)); // Turn the LED from off to on, or on to off
    delay(100);         // fast blink
  }
  Serial1.begin(8*115200,SERIAL_8E1);
}

/*
 * create hostname based on board & serial Id
 */
String getHostname() {
    uint16_t *idBase0 =  (uint16_t *) (0x1FFFF7E8);
  uint16_t *idBase1 =  (uint16_t *) (0x1FFFF7E8+0x02);
  uint32_t *idBase2 =  (uint32_t *) (0x1FFFF7E8+0x04);
  uint32_t *idBase3 =  (uint32_t *) (0x1FFFF7E8+0x08);
  return "MAPLE-"+String(*idBase3 & 0xFFFF);
}

extern "C" char* sbrk(int incr);
static int FreeStack() {
  char top = 't';
  return &top - reinterpret_cast<char*>(sbrk(0));
}


// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(500);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(500);                       // wait for a second
  jsonDoc.clear();
  deserializeJson(jsonDoc,"{}");
  JsonObject json = jsonDoc.as<JsonObject>();
  json["cmd"]="MQTT-PUB";
  json["topic"]="src/"+getHostname()+"/system/upTime";
  json["message"]=String(millis());
  json["qos"]=0;
  json["retained"]=false;
  String str;
  serializeJson(jsonDoc,str);
     str+="\n";
  Serial.println(str);
  Serial1.println(str);
  json["topic"]="src/"+getHostname()+"/system/heap";
  json["message"]=String(FreeStack());
   serializeJson(jsonDoc,str);//
   str+="\n";
  Serial.println(str);
    Serial1.println(str);
    Serial.flush();
    Serial1.flush();
}

I tried all kind of build options, but none seem to work correctly. Code compiles but doesn’t write anything to UART1 or USB.

[env:maple]
platform = ststm32
board = maple
framework = arduino
build_flags = 
    -D USBD_USE_CDC
    -D PIO_FRAMEWORK_ARDUINO_ENABLE_CDC
    -D PIO_FRAMEWORK_ARDUINO_USB_FULLMODE
    -D USBCON
	-D USBD_VID=0x0483
	-D USB_MANUFACTURER="Unknown"
	-D USB_PRODUCT="\"BLUEPILL_F103C8\""
	-D HAL_PCD_MODULE_ENABLED
1 Like

Ok, made some progress. This .ini works !

[env:maple]
platform = ststm32
board = maple_mini_origin
framework = arduino
upload_protocol = serial
build_flags = 
    -D USBD_USE_CDC
    -D PIO_FRAMEWORK_ARDUINO_ENABLE_CDC
    -D PIO_FRAMEWORK_ARDUINO_USB_FULLMODE
    -D USBCON
	-D USBD_VID=0x0483
	-D USB_MANUFACTURER="Unknown"
	-D USB_PRODUCT="\"BLUEPILL_F103C8\""
	-D HAL_PCD_MODULE_ENABLED
1 Like