update sample code without actual testing it

.github/workflows/build.yml

@@ -10,7 +10,8 @@ jobs:
         example:
           - examples/analogRead_Mux/analogRead_Mux.ino
           - examples/analogRead_Scan/analogRead_Scan.ino
-          - examples/analogRead_ContinuousScan/analogRead_ContinuousScan.ino
+          - examples/analogRead_Scan_Differential/analogRead_Scan_Differential.ino
+          - examples/analogReadContinuous_Scan/analogReadContinuous_Scan.ino
     steps:
     - uses: actions/checkout@v2
     - name: Cache pip

.github/workflows/lint.yml

@@ -19,7 +19,8 @@ jobs:
         examples:
           - examples/analogRead_Mux/analogRead_Mux.ino
           - examples/analogRead_Scan/analogRead_Scan.ino
-          - examples/analogRead_ContinuousScan/analogRead_ContinuousScan.ino
+          - examples/analogRead_Scan_Differential/analogRead_Scan_Differential.ino
+          - examples/analogReadContinuous_Scan/analogReadContinuous_Scan.ino
     steps:
     - uses: actions/checkout@v3
     - uses: arduino/arduino-lint-action@v1

examples/analogRead_ContinuousScan/analogRead_ContinuousScan.ino → examples/analogReadContinuous_Scan/analogReadContinuous_Scan.ino

@@ -41,6 +41,7 @@ void setup() {
       ;
   }
   mcp.enableScanChannel(MCP_CH0);
+  mcp.enableScanChannel(MCP_CH1);
   mcp.startContinuous();
 
   Serial.println("MCP setup done");
@@ -58,16 +59,16 @@ void loop() {
 
     // read the input on default analog channel:
     int32_t adcdata0 = mcp.analogReadContinuous(MCP_CH0);
-    // int32_t adcdata1 = mcp.analogReadContinuous(MCP_CH1);
+    int32_t adcdata1 = mcp.analogReadContinuous(MCP_CH1);
 
     // Convert the analog reading
     double voltage0 = adcdata0 * mcp.getReference() / mcp.getMaxValue();
-    // double voltage1 = adcdata1 * mcp.getReference() / mcp.getMaxValue();
+    double voltage1 = adcdata1 * mcp.getReference() / mcp.getMaxValue();
 
     // print out the value you read:
     Serial.print("voltage0: ");
     Serial.println(voltage0, 10);
-    // Serial.print("voltage1: ");
-    // Serial.println(voltage1, 10);
+    Serial.print("voltage1: ");
+    Serial.println(voltage1, 10);
   }
 }

examples/analogRead_Scan/analogRead_Scan.ino

@@ -39,6 +39,7 @@ void setup() {
       ;
   }
   mcp.enableScanChannel(MCP_CH0);
+  mcp.enableScanChannel(MCP_CH1);
 }
 
 // the loop routine runs over and over again forever:

examples/analogRead_Scan_Differential/analogRead_Scan_Differential.ino

@@ -0,0 +1,57 @@
+/*
+  ReadAnalogVoltage
+
+  Reads an analog input off channel0, converts it to voltage, and prints the
+  result to the Serial Monitor. Attach the center pin of a potentiometer to pin
+  A0, and the outside pins to +3V3 and ground.
+
+*/
+
+#include "MCP3x6x.h"
+
+#if defined ARDUINO_AVR_PROMICRO8
+MCP3561 mcp(2, 3, 10);
+#elif defined ARDUINO_GRAND_CENTRAL_M4
+SPIClass mySPI = SPIClass(&sercom5, 125, 126, 99, SPI_PAD_0_SCK_3, SERCOM_RX_PAD_2);
+MCP3561 mcp(84, 81, 98, &mySPI);
+#elif defined ADAFRUIT_METRO_M0_EXPRESS
+SPIClass mySPI(&sercom1, 12, 13, 11, SPI_PAD_0_SCK_1, SERCOM_RX_PAD_3);
+MCP3561 mcp(8, 7, 10, &mySPI, 11, 12, 13);
+#elif defined ARDUINO_ARCH_ESP8266
+MCP3561 mcp(D1, D2, SS);
+// #elif
+// todo: might need further cases, didn't check for all boards
+#else
+MCP3561 mcp;
+#endif
+
+void mcp_wrapper() { mcp.IRQ_handler(); }
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial)
+    ;
+  Serial.println(__FILE__);
+
+  if (!mcp.begin()) {
+    Serial.println("failed to initialize MCP");
+    while (1)
+      ;
+  }
+  mcp.enableScanChannel(MCP_DIFFA);
+}
+
+// the loop routine runs over and over again forever:
+void loop() {
+  // read the input on default analog channel:
+  int32_t adcdata = mcp.analogRead(MCP_DIFFA);
+
+  // Convert the analog reading
+  double voltage = adcdata * mcp.getReference() / mcp.getMaxValue();
+
+  // print out the value you read:
+  Serial.print("voltage: ");
+  Serial.println(voltage, 10);
+  // pause program for one second
+  delay(1000);
+}