diff --git a/you-ass-bee-see/src/main.rs b/you-ass-bee-see/src/main.rs
index 3338c2e..96d827c 100644
--- a/you-ass-bee-see/src/main.rs
+++ b/you-ass-bee-see/src/main.rs
@@ -4,25 +4,60 @@ use i2cdev::linux::LinuxI2CDevice;
 const IECS_CMD: u8 = 8;
 const IECS_DATA: u8 = 9;
 const MSG_OUT_RDATA: u8 = 18;
-const CMD_AFRR: &'static [u8] = &[b'A', b'F', b'R', b'R'];
+
+const CMD_AFRR: u32 = 0x52524641;
+const CMD_AUTH: u32 = 0x48545541;
+const CMD_BLKW: u32 = 0x574b4c42;
+const CMD_BOPS: u32 = 0x53504f42;
+const CMD_PCYC: u32 = 0x43594350;
+
+fn read<I: I2CDevice>(dev: &mut I, reg: u8) -> Result<u32, I::Error> {
+    let bytes = dev.smbus_read_block_data(reg)?;
+    //TODO: return error on bytes.len() != 4
+    Ok(
+        bytes[0] as u32 |
+        (bytes[1] as u32) << 8 |
+        (bytes[2] as u32) << 16 |
+        (bytes[3] as u32) << 24
+    )
+}
+
+fn write<I: I2CDevice>(dev: &mut I, reg: u8, data: u32) -> Result<(), I::Error> {
+    let bytes = [
+        data as u8,
+        (data >> 8) as u8,
+        (data >> 16) as u8,
+        (data >> 24) as u8,
+    ];
+    dev.smbus_write_block_data(reg, &bytes)
+}
+
+
+fn command<I: I2CDevice>(dev: &mut I, cmd: u32) -> Result<u32, I::Error> {
+    write(dev, IECS_CMD, cmd)?;
+    loop {
+        let status = read(dev, IECS_CMD)?;
+        println!("Status: {:X}", status);
+        if status != cmd {
+            //TODO: perform error checking here
+            return Ok(status);
+        }
+    }
+}
 
 fn main() {
     let mut dev = LinuxI2CDevice::new("/dev/i2c-11", 0x40).unwrap();
-    println!("Vendor: {:X?}", dev.smbus_read_block_data(0));
-    println!("Device: {:X?}", dev.smbus_read_block_data(1));
+    println!("Vendor: {:X}", read(&mut dev, 0).unwrap());
+    println!("Device: {:X}", read(&mut dev, 1).unwrap());
 
     for offset in 0..=8 {
-        dev.smbus_write_block_data(IECS_DATA, &[offset, 0, 0, 0]).unwrap();
-        dev.smbus_write_block_data(IECS_CMD, CMD_AFRR).unwrap();
-
-        loop {
-            let data = dev.smbus_read_block_data(IECS_CMD).unwrap();
-            println!("{:?}", data);
-            if data.as_slice() != CMD_AFRR {
-                break;
-            }
+        write(&mut dev, IECS_DATA, offset).unwrap();
+        let status = command(&mut dev, CMD_AFRR).unwrap();
+        if status == 0 {
+            let data = read(&mut dev, MSG_OUT_RDATA).unwrap();
+            println!("{:X}: {:X}", offset, data);
+        } else {
+            println!("{:X}: Error {:X}", offset, status);
         }
-
-        println!("{:X}: {:X?}", offset, dev.smbus_read_block_data(MSG_OUT_RDATA));
     }
 }