C/C++ Question Pin interrup issue in LoRa library only in B4R project

candide

Active Member
Licensed User
in March, i was working on a wrapper for LoRa library, but from tests done by ehsan gilassi, both call-back were not working.

last week i received 2 SX1278, Ra-01 M modules, i was able to make tests and i was able to reproduce this issue.
- call-back OnReceive/OnRxDone is OK under arduino (project example with library)
- call-back OnReceive/OnRxDone is NOK under B4R. (same project converted in B4R)

from tests, call-back process is working => issue is before
with traces added in library, i found an issue at interruption on Dio0 pin, after Dio0 interrupt, behavior was different in arduino project and in B4R project
=======================
code at Dio0 interrupt:
=======================
B4X:
ISR_PREFIX void LoRaClass::onDio0Rise()
{
   LoRa.handleDio0Rise();
}
void LoRaClass::handleDio0Rise()
{
   int irqFlags = readRegister(REG_IRQ_FLAGS);
   Serial.print("irqFlags=");Serial.println(irqFlags); //debug******************
//=> irqFlags should be "80" but with B4R it is "00"
  // clear IRQ's
  writeRegister(REG_IRQ_FLAGS, irqFlags);

  if ((irqFlags & IRQ_PAYLOAD_CRC_ERROR_MASK) == 0) {
    if ((irqFlags & IRQ_RX_DONE_MASK) != 0) {
//=> du to irqflags=00, never we come in this part, never we received a packet
       Serial.println("receive packet");//debug*********************************
      _packetIndex = 0;

      // read packet length
      int packetLength = _implicitHeaderMode ? readRegister(REG_PAYLOAD_LENGTH) : readRegister(REG_RX_NB_BYTES);

      // set FIFO address to current RX address
      writeRegister(REG_FIFO_ADDR_PTR, readRegister(REG_FIFO_RX_CURRENT_ADDR));

      if (_onReceive) {
        _onReceive(packetLength);
      }
    }
    else if ((irqFlags & IRQ_TX_DONE_MASK) != 0) {
      if (_onTxDone) {
        _onTxDone();
      }
    }
  }
}
after several tests done, interruption routine don't have access to variables in the library... No crash, but value are seen = 00

i did a change in code to check what is wrong: i run handleDio0Rise from a loop in B4R project, not from interruption, and interruption is doing nothing
===================
code after modification is this one:
====================
B4X:
//added for B4R
void LoRaClass::processing()  {
   if (digitalRead(_dio0)== HIGH) {handleDio0Rise(); }  //test of pin dio0 used for interruption
   }  
ISR_PREFIX void LoRaClass::onDio0Rise()
{
  //LoRa.handleDio0Rise();
}
void LoRaClass::handleDio0Rise()
{
  int irqFlags = readRegister(REG_IRQ_FLAGS);

  // clear IRQ's
  writeRegister(REG_IRQ_FLAGS, irqFlags);

  if ((irqFlags & IRQ_PAYLOAD_CRC_ERROR_MASK) == 0) {

    if ((irqFlags & IRQ_RX_DONE_MASK) != 0) {
      // received a packet
      _packetIndex = 0;

      // read packet length
      int packetLength = _implicitHeaderMode ? readRegister(REG_PAYLOAD_LENGTH) : readRegister(REG_RX_NB_BYTES);

      // set FIFO address to current RX address
      writeRegister(REG_FIFO_ADDR_PTR, readRegister(REG_FIFO_RX_CURRENT_ADDR));

      if (_onReceive) {
        _onReceive(packetLength);
      }
    }
    else if ((irqFlags & IRQ_TX_DONE_MASK) != 0) {
      if (_onTxDone) {
        _onTxDone();
      }
    }
  }
}
in this configuration interruption is doing nothing, a check of dio0 pin is done from a loop in B4R and if level HIGHT => run of handleDio0Rise.
=> with this modification call-backs are working.
tests were done on esp32 and esp8266, and issue is the same: library is working with arduino, library is not working with B4R due to issue on pin interrupt

=> why interruption on pin working in arduino project is not working in B4R project ? i didn't find explanation...

if someone have an idea, he will be welcome
 

Attachments

  • rLoRa.zip
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candide

Active Member
Licensed User
in fact, data are missing at SPI interface :
|code]
uint8_t LoRaClass::singleTransfer(uint8_t address, uint8_t value)
{
uint8_t response;

digitalWrite(_ss, LOW);
_spi->beginTransaction(_spiSettings);
_spi->transfer(address);
response = _spi->transfer(value);
_spi->endTransaction();
Serial.print("response SPI :");Serial.println(response) ; // always "00" when interruption at origin of request
digitalWrite(_ss, HIGH);

return response;
}
[/code]

=> when request to SPI library is coming from interruption , i have an answer "NULL"
=> when request to SPI library is not coming from an interruption, i have correct answer.

if someone have an explanation, he will be welcome
 

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