1 files changed, 93 insertions, 0 deletions
diff --git a/CODE/debugprewk/debug/i2c_scanner/i2c_scanner.ino b/CODE/debugprewk/debug/i2c_scanner/i2c_scanner.ino
new file mode 100644
index 0000000..d3d4570
--- /dev/null
+++ b/CODE/debugprewk/debug/i2c_scanner/i2c_scanner.ino
@@ -0,0 +1,93 @@
+/**
+i2c port scanner based on:
+  in wire library examples i2c_scanner
+  https://learn.adafruit.com/adafruit-pca9548-8-channel-stemma-qt-qwiic-i2c-multiplexer/arduino
+
+
+ *
+ */
+
+#include <Wire.h>
+
+#define PCAADDR 0x70    //i2c address of the i2c multiplexer
+
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial); // Leonardo: wait for Serial Monitor
+  Serial.println("\nI2C Scanner");
+
+}
+
+void pcaselect(uint8_t i) {
+  if (i > 7) return;
+ 
+  Wire.beginTransmission(PCAADDR);
+  Wire.write(1 << i);
+  Wire.endTransmission();  
+}
+
+
+
+
+void scandirectports(){
+  Wire.begin();
+  int nDevices = 0;
+  Serial.println("Scanning for i2c ports on board...");
+
+  for (byte address = 1; address < 127; ++address) {
+    // The i2c_scanner uses the return value of
+    // the Wire.endTransmission to see if
+    // a device did acknowledge to the address.
+    Wire.beginTransmission(address);
+    byte error = Wire.endTransmission();
+
+    if (error == 0) {
+      Serial.print("I2C device found at address 0x");
+      if (address < 16) {
+        Serial.print("0");
+      }
+      Serial.print(address, HEX);
+      Serial.println("  !");
+
+      ++nDevices;
+    } else if (error == 4) {
+      Serial.print("Unknown error at address 0x");
+      if (address < 16) {
+        Serial.print("0");
+      }
+      Serial.println(address, HEX);
+    }
+  }
+  if (nDevices == 0) {
+    Serial.println("No I2C devices found\n");
+  } else {
+    Serial.println("done\n");
+  }
+  Serial.println("done scanning for i2c ports on board");
+}
+void scani2cmultiplexer(){
+  Serial.println("Scanning for i2c ports on i2c multiplexer...");
+  for (uint8_t t=0; t<8; t++) {
+    pcaselect(t);
+    Serial.print("PCA Port #"); Serial.println(t);
+
+    for (uint8_t addr = 0; addr<=127; addr++) {
+      if (addr == PCAADDR) continue;
+      Wire.beginTransmission(addr);
+      if (!Wire.endTransmission()) {
+        Serial.print("Found I2C 0x");  Serial.println(addr,HEX);
+      }
+    }
+  }
+  Serial.println("done scanning for i2c ports on i2c multiplexer");
+}
+
+
+
+void loop() {
+ scandirectports();
+ delay(1000);
+ scani2cmultiplexer();
+ delay(1000);
+}