portuino now kinda works with the pinetab lora USB module.

still need to add an AEX256 impl for the linux port and optimize a bit

platformio.ini

@@ -65,7 +65,7 @@ lib_deps =
   1202 ; CRC32, explicitly needed because dependency is missing in the ble ota update lib
   https://github.com/meshtastic/arduino-fsm.git#2f106146071fc7bc620e1e8d4b88dc4e0266ce39
   https://github.com/meshtastic/SparkFun_Ublox_Arduino_Library.git#31015a55e630a2df77d9d714669c621a5bf355ad
-  https://github.com/meshtastic/RadioLib.git#8657380241bce681c33aab46598bbf13b11f876c
+  https://github.com/meshtastic/RadioLib.git#07de964e929238949035fb0d5887026a3058df1a
   https://github.com/meshtastic/TinyGPSPlus.git#9c1d584d2469523381e077b0b9c1bf868d6c0206
   https://github.com/meshtastic/AXP202X_Library.git#8404abb6d4b486748636bc6ad72d2a47baaf5460
   Wire ; explicitly needed here because the AXP202 library forgets to add it

src/configuration.h

@@ -365,7 +365,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #define USE_RF95
 #define LORA_DIO0 26 // a No connect on the SX1262 module
-#define LORA_RESET 23
+#define LORA_RESET RADIOLIB_NC
 #define LORA_DIO1 33 // Not really used
 #define LORA_DIO2 32 // Not really used
 

src/mesh/RF95Interface.h

@@ -14,6 +14,9 @@ class RF95Interface : public RadioLibInterface
   public:
     RF95Interface(RADIOLIB_PIN_TYPE cs, RADIOLIB_PIN_TYPE irq, RADIOLIB_PIN_TYPE rst, SPIClass &spi);
 
+    /// Some boards (Pinetab Lora module) have broken IRQ wires, so we need to poll via i2c registers
+    bool isIRQPending() { return lora->getPendingIRQ(); }
+
     /// Initialise the Driver transport hardware and software.
     /// Make sure the Driver is properly configured before calling init().
     /// \return true if initialisation succeeded.

src/portduino/PortduinoGlue.cpp

@@ -37,6 +37,52 @@ CryptoEngine *crypto = new CryptoEngine();
 
 void updateBatteryLevel(uint8_t level) NOT_IMPLEMENTED("updateBatteryLevel");
 
+#include <assert.h>
+#include "mesh/RF95Interface.h"
+
+/** Dear pinetab hardware geeks!
+ * 
+ * The current pinetab lora module has a slight bug.  The ch341 part only provides ISR assertions on edges.
+ * This makes sense because USB interrupts happen through fast/repeated special irq urbs that are constantly
+ * chattering on the USB bus.
+ * 
+ * But this isn't sufficient for level triggered ISR sources like the sx127x radios.  The common way that seems to
+ * be addressed by cs341 users is to **always** connect the INT# (pin 26 on the ch341f) signal to one of the GPIO signals
+ * on the part.  I'd recommend connecting that LORA_DIO0/INT# line to pin 19 (data 4) on the pinetab board.  This would
+ * provide an efficent mechanism so that the (kernel) code in the cs341 driver that I've slightly hacked up to see the
+ * current state of LORA_DIO0.  Without that access, I can't know if the interrupt is still pending - which would create
+ * race conditions in packet handling.  
+ * 
+ * My workaround is to poll the status register internally to the sx127x.  Which is expensive because it involves a number of
+ * i2c transactions and many trips back and forth between kernel and my userspace app.  I think shipping the current version
+ * of the pinetab lora device would be fine because I can poll slowly (because lora is slow).  But if you ever have cause to
+ * rev this board.  I highly encourage this small change.
+ * 
+ * Btw - your little "USB lora dongle" is really neat.  I encourage you to sell it, because even non pinetab customers could
+ * use it to easily add lora to rasberry pi, desktop pcs etc...
+ * 
+ * Porduino helper class to do this i2c based polling:
+ */
+class R595PolledIrqPin : public GPIOPin {
+public:
+    R595PolledIrqPin() : GPIOPin(LORA_DIO0, "LORA_DIO0") {}
+
+    /// Read the low level hardware for this pin
+    virtual PinStatus readPinHardware()
+    {
+        if(isrPinStatus < 0)
+            return LOW; // No interrupt handler attached, don't bother polling i2c right now
+        else {
+            extern RadioInterface *rIf; // FIXME, temporary hack until we know if we need to keep this 
+
+            assert(rIf);
+            RF95Interface *rIf95 = static_cast<RF95Interface *>(rIf);
+            bool p = rIf95->isIRQPending();
+            // log(SysGPIO, LogDebug, "R595PolledIrqPin::readPinHardware(%s, %d, %d)", getName(), getPinNum(), p);
+            return p ? HIGH : LOW;
+        }
+    }
+};
 
 
 /** apps run under portduino can optionally define a portduinoSetup() to 
@@ -45,7 +91,7 @@ void updateBatteryLevel(uint8_t level) NOT_IMPLEMENTED("updateBatteryLevel");
  */
 void  portduinoSetup() {
   printf("Setting up Meshtastic on Porduino...\n");
-  gpioBind((new SimGPIOPin(LORA_DIO0, "LORA_DIO0")));
-  gpioBind((new SimGPIOPin(LORA_RESET, "LORA_RESET")));
+  gpioBind(new R595PolledIrqPin());
+  // gpioBind((new SimGPIOPin(LORA_RESET, "LORA_RESET")));
   gpioBind((new SimGPIOPin(RF95_NSS, "RF95_NSS"))->setSilent());
 }