added ability to set/get the free ram byte on pcf85063a

drivers/pcf85063a/pcf85063a.cpp

@@ -178,4 +178,12 @@ namespace pimoroni {
       address, Registers::CONTROL_2, bits);
   }
 
+  void PCF85063A::set_byte(uint8_t v) {
+    i2c->reg_write_uint8(address, Registers::RAM_BYTE, v);
+  }
+
+  uint8_t PCF85063A::get_byte() {
+    return i2c->reg_read_uint8(address, Registers::RAM_BYTE);
+  }
+
 }

drivers/pcf85063a/pcf85063a.hpp

@@ -133,6 +133,10 @@ namespace pimoroni {
 
     // Clock output
     void set_clock_output(ClockOut co);
+
+    // FREE byte of RAM!!
+    void set_byte(uint8_t v);
+    uint8_t get_byte();
   };
 
 }