diff --git a/klippy/extras/mcp4451.py b/klippy/extras/mcp4451.py
index a7eda9aa..9a79671b 100644
--- a/klippy/extras/mcp4451.py
+++ b/klippy/extras/mcp4451.py
@@ -10,8 +10,9 @@ WiperRegisters = [0x00, 0x01, 0x06, 0x07]
 class mcp4451:
     def __init__(self, config):
         printer = config.get_printer()
+        # Read config parameters
         self.mcu = mcu.get_printer_mcu(printer, config.get('mcu', 'mcu'))
-        self.i2c_addr = config.getint('i2c_address')
+        i2c_addr = config.getint('i2c_address')
         scale = config.getfloat('scale', 1., above=0.)
         wipers = [None]*4
         for i in range(len(wipers)):
@@ -19,14 +20,20 @@ class mcp4451:
                                   minval=0., maxval=scale)
             if val is not None:
                 wipers[i] = int(val * 255. / scale + .5)
+        # Setup i2c
+        self.oid = self.mcu.create_oid()
+        self.mcu.add_config_cmd(
+            "config_i2c oid=%d bus=0 rate=100000 addr=%d" % (
+                self.oid, i2c_addr))
+        # Configure registers
         self.add_config_cmd(0x04, 0xff)
         self.add_config_cmd(0x0a, 0xff)
         for reg, val in zip(WiperRegisters, wipers):
             if val is not None:
                 self.add_config_cmd(reg, val)
     def add_config_cmd(self, reg, val):
-        self.mcu.add_config_cmd("i2c_send data=%02x%02x%02x" % (
-            self.i2c_addr, (reg << 4) | ((val >> 8) & 0x03), val), is_init=True)
+        self.mcu.add_config_cmd("i2c_write oid=%d data=%02x%02x" % (
+            self.oid, (reg << 4) | ((val >> 8) & 0x03), val), is_init=True)
 
 def load_config_prefix(config):
     return mcp4451(config)
diff --git a/src/lpc176x/Kconfig b/src/lpc176x/Kconfig
index aaf852b6..f722aa3e 100644
--- a/src/lpc176x/Kconfig
+++ b/src/lpc176x/Kconfig
@@ -7,6 +7,7 @@ config LPC_SELECT
     default y
     select HAVE_GPIO
     select HAVE_GPIO_ADC
+    select HAVE_GPIO_I2C
     select HAVE_GPIO_SPI
     select HAVE_GPIO_BITBANGING
 
diff --git a/src/lpc176x/gpio.h b/src/lpc176x/gpio.h
index 59041fe3..79d48698 100644
--- a/src/lpc176x/gpio.h
+++ b/src/lpc176x/gpio.h
@@ -37,4 +37,13 @@ void spi_prepare(struct spi_config config);
 void spi_transfer(struct spi_config config, uint8_t receive_data
                   , uint8_t len, uint8_t *data);
 
+struct i2c_config {
+    uint8_t addr;
+};
+
+struct i2c_config i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr);
+void i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write);
+void i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg
+              , uint8_t read_len, uint8_t *read);
+
 #endif // gpio.h
diff --git a/src/lpc176x/i2c.c b/src/lpc176x/i2c.c
index 76c5b738..50081d50 100644
--- a/src/lpc176x/i2c.c
+++ b/src/lpc176x/i2c.c
@@ -7,6 +7,7 @@
 #include "LPC17xx.h" // LPC_I2C1
 #include "board/misc.h" // timer_is_before
 #include "command.h" // DECL_COMMAND
+#include "gpio.h" // i2c_setup
 #include "internal.h" // gpio_peripheral
 #include "sched.h" // sched_shutdown
 
@@ -37,6 +38,15 @@ i2c_init(void)
     LPC_I2C1->I2CONSET = IF_ENA;
 }
 
+struct i2c_config
+i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr)
+{
+    if (bus)
+        shutdown("Unsupported i2c bus");
+    i2c_init();
+    return (struct i2c_config){ .addr=addr };
+}
+
 static void
 i2c_wait(uint32_t bit, uint32_t timeout)
 {
@@ -78,23 +88,21 @@ i2c_stop(uint32_t timeout)
     i2c_wait(IF_STOP, timeout);
 }
 
-static void
-i2c_send(uint8_t *data, int data_len)
+void
+i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write)
 {
-    i2c_init();
     uint32_t timeout = timer_read_time() + timer_from_us(5000);
 
     i2c_start(timeout);
-    while (data_len--)
-        i2c_send_byte(*data++, timeout);
+    i2c_send_byte(config.addr, timeout);
+    while (write_len--)
+        i2c_send_byte(*write++, timeout);
     i2c_stop(timeout);
 }
 
-// This provides just enough functionality to program an MCP4451 chip
 void
-command_i2c_send(uint32_t *args)
+i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg
+         , uint8_t read_len, uint8_t *read)
 {
-    uint8_t data_len = args[0], *data = (void*)(size_t)args[1];
-    i2c_send(data, data_len);
+    shutdown("i2c_read not supported on lpc176x");
 }
-DECL_COMMAND(command_i2c_send, "i2c_send data=%*s");