From 7a411f2ae5cc61f69766647934e896d698a51d28 Mon Sep 17 00:00:00 2001
From: Jim Whitelaw <jimwhitelaw@gmail.com>
Date: Sat, 16 Dec 2023 22:57:46 -0700
Subject: [PATCH] Fix for issue myELM327.supportedPIDs_1_20()  not working as
 expected #157

---
 .../ESP32_CheckPIDs_1_20.ino                  | 53 +++++++++++++++++++
 src/ELMduino.cpp                              |  2 +-
 2 files changed, 54 insertions(+), 1 deletion(-)
 create mode 100644 examples/ESP32_CheckPIDs_1_20/ESP32_CheckPIDs_1_20.ino

diff --git a/examples/ESP32_CheckPIDs_1_20/ESP32_CheckPIDs_1_20.ino b/examples/ESP32_CheckPIDs_1_20/ESP32_CheckPIDs_1_20.ino
new file mode 100644
index 0000000..735bbda
--- /dev/null
+++ b/examples/ESP32_CheckPIDs_1_20/ESP32_CheckPIDs_1_20.ino
@@ -0,0 +1,53 @@
+#include "BluetoothSerial.h"
+#include "ELMduino.h"
+
+BluetoothSerial SerialBT;
+#define ELM_PORT SerialBT
+#define DEBUG_PORT Serial
+
+ELM327 myELM327;
+
+uint32_t rpm = 0;
+
+void setup()
+{
+#if LED_BUILTIN
+    pinMode(LED_BUILTIN, OUTPUT);
+    digitalWrite(LED_BUILTIN, LOW);
+#endif
+
+    DEBUG_PORT.begin(115200);
+    // SerialBT.setPin("1234");
+    ELM_PORT.begin("ArduHUD", true);
+
+    if (!ELM_PORT.connect("OBDII"))
+    {
+        DEBUG_PORT.println("Couldn't connect to OBD scanner - Phase 1");
+        while (1)
+            ;
+    }
+
+    if (!myELM327.begin(ELM_PORT, true, 2000))
+    {
+        Serial.println("Couldn't connect to OBD scanner - Phase 2");
+        while (1)
+            ;
+    }
+
+    Serial.println("Connected to ELM327");
+}
+
+void loop()
+{
+    uint32_t pids = myELM327.supportedPIDs_1_20();
+
+    if (myELM327.nb_rx_state == ELM_SUCCESS)
+    {
+        Serial.print("Supported PIDS: "); Serial.println(pids);
+        delay(10000);
+    }
+    else if (myELM327.nb_rx_state != ELM_GETTING_MSG)
+    {
+        myELM327.printError();
+    }       
+}
diff --git a/src/ELMduino.cpp b/src/ELMduino.cpp
index 69c84cf..ac57041 100644
--- a/src/ELMduino.cpp
+++ b/src/ELMduino.cpp
@@ -2359,7 +2359,7 @@ uint64_t ELM327::findResponse()
         {
             uint8_t payloadIndex = firstDatum + i;
             uint8_t bitsOffset = 4 * (numPayChars - i - 1);
-            response = response | (ctoi(payload[payloadIndex]) << bitsOffset);
+            response = response | ((uint64_t)ctoi(payload[payloadIndex]) << bitsOffset);
         }
 
         // It is useful to have the response bytes