oc cannot control the output because it cannot modify the mode

examples/TestCH422G/TestCH422G.ino

@@ -1,19 +1,6 @@
 #include <Arduino.h>
 #include <ESP_IOExpander_Library.h>
 
-/*********************
-Connect IO0 of CH4-22G to OC0, and IO5 to OC1.
-Then, the program is burned, and the serial terminal will output:
-Test begin
-Original status:
-Set pint 0 and 5 to input mode:
-Pin level: 0, 0
-Pin level: 1, 1
-Pin level: 0, 0
-Pin level: 1, 1
-...
-**********************/
-
 /**
  * Create an ESP_IOExpander object, Currently supports:
  *      - TCA95xx_8bit
@@ -25,6 +12,8 @@ Pin level: 1, 1
 #define EXAMPLE_I2C_NUM         (0)
 #define EXAMPLE_I2C_SDA_PIN     (8)
 #define EXAMPLE_I2C_SCL_PIN     (9)
+#define EXAMPLE_I2C_ADDR        (ESP_IO_EXPANDER_I2C_CH422G_ADDRESS)   // Modify this value according to the
+                                                                            // hardware address
 
 #define _EXAMPLE_CHIP_CLASS(name, ...)   ESP_IOExpander_##name(__VA_ARGS__)
 #define EXAMPLE_CHIP_CLASS(name, ...)    _EXAMPLE_CHIP_CLASS(name, ##__VA_ARGS__)
@@ -34,56 +23,64 @@ ESP_IOExpander *expander = NULL;
 void setup()
 {
     Serial.begin(115200);
+    delay(1000);
     Serial.println("Test begin");
 
-    expander = new EXAMPLE_CHIP_CLASS(EXAMPLE_CHIP_NAME,
-                                    (i2c_port_t)EXAMPLE_I2C_NUM, ESP_IO_EXPANDER_I2C_CH422G_ADDRESS_000,
-                                    EXAMPLE_I2C_SCL_PIN, EXAMPLE_I2C_SDA_PIN);
+    expander = new EXAMPLE_CHIP_CLASS(EXAMPLE_CHIP_NAME, (i2c_port_t)EXAMPLE_I2C_NUM, EXAMPLE_I2C_ADDR,
+                                      EXAMPLE_I2C_SCL_PIN, EXAMPLE_I2C_SDA_PIN);
     expander->init();
     expander->begin();
+
+    /* For CH422G */
+    // static_cast<ESP_IOExpander_CH422G *>(expander)->enableOC_PushPull();
+    // static_cast<ESP_IOExpander_CH422G *>(expander)->enableOC_OpenDrain();
 
     Serial.println("Original status:");
     expander->printStatus();
 
-    //Set pint 0 and 5 to input mode
+    expander->pinMode(8, OUTPUT);
+    expander->pinMode(9, OUTPUT);
+    // expander->multiPinMode(IO_EXPANDER_PIN_NUM_2 | IO_EXPANDER_PIN_NUM_3, OUTPUT);
+
+    Serial.println("Set pint 8 and 9 to output mode:");
+    expander->printStatus();
+
+    expander->digitalWrite(8, LOW);
+    expander->digitalWrite(9, LOW);
+    // expander->multiDigitalWrite(IO_EXPANDER_PIN_NUM_2 | IO_EXPANDER_PIN_NUM_3, LOW);
+
+    Serial.println("Set pint 0 and 5 to low level:");
+    expander->printStatus();
+
     expander->pinMode(0, INPUT);
     expander->pinMode(5, INPUT);
-    // expander->multiPinMode(IO_EXPANDER_PIN_NUM_0 | IO_EXPANDER_PIN_NUM_5, INPUT);
+    // expander->multiPinMode(IO_EXPANDER_PIN_NUM_2 | IO_EXPANDER_PIN_NUM_3, INPUT);
 
     Serial.println("Set pint 0 and 5 to input mode:");
     expander->printStatus();
-
 }
 
 int level[4] = {0, 0, 0, 0};
+uint32_t level_temp;
+String level_str;
 
 void loop()
 {
-    //Set od pint 0-1 to low level
-    expander->digital_od_Write(0, LOW);
-    expander->digital_od_Write(1, LOW);
-    // expander->multiDigital_od_Write(OD_IO_EXPANDER_PIN_NUM_0 |  OD_IO_EXPANDER_PIN_NUM_1, LOW);
-    delay(1);
-    // Read pin 0 and 5 level
-    level[0] = expander->digitalRead(0);
-    level[1] = expander->digitalRead(5);
-    Serial.print("Pin level: ");
-    Serial.print(level[0]);
-    Serial.print(", ");
-    Serial.println(level[1]);
-    delay(1000);
+    for(int i = 0;i < 100;i++)
+    {
+      expander->digitalWrite(8, i%2);
+      expander->digitalWrite(9, !(i%2));
 
-    //Set od pint 0-1 to high level
-    expander->digital_od_Write(0, HIGH);
-    expander->digital_od_Write(1, HIGH);
-    // expander->multiDigital_od_Write(OD_IO_EXPANDER_PIN_NUM_0 |  OD_IO_EXPANDER_PIN_NUM_1, HIGH);
-
-    delay(1);
-    level[0] = expander->digitalRead(0);
-    level[1] = expander->digitalRead(5);
-    Serial.print("Pin level: ");
-    Serial.print(level[0]);
-    Serial.print(", ");
-    Serial.println(level[1]);
-    delay(1000);
+      // Read pin 0 and 5 level
+      level[0] = expander->digitalRead(0);
+      level[1] = expander->digitalRead(5);
+
+      Serial.print("Pin level: ");
+      Serial.print(level[0]);
+      Serial.print(", ");
+      Serial.println(level[1]);
+
+      delay(1000);
+    }
+
 }