diff --git a/src/lib.rs b/src/lib.rs
index 0ab8f42..e68c666 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -125,6 +125,15 @@ where
         Ok(())
     }
 
+    /// How many SW rows to enable
+    pub fn sw_enablement(&mut self, setting: SwSetting) -> Result<(), I2cError> {
+        let config_register = self.read_register(Page::Config, addresses::CONFIG_REGISTER)?;
+
+        let new_val = (config_register & 0x0F) | (setting as u8) << 4;
+        self.write_register(Page::Config, addresses::CONFIG_REGISTER, new_val)?;
+        Ok(())
+    }
+
     /// Set the PWM frequency
     pub fn set_pwm_freq(&mut self, pwm: PwmFreq) -> Result<(), I2cError> {
         self.write_register(Page::Config, addresses::PWM_FREQ_REGISTER, pwm as u8)
@@ -168,6 +177,40 @@ where
             ],
         )
     }
+
+    //pub fn check_open(&mut self, register: u8) -> Result<u8, I2cError> {
+    pub fn check_open<DEL: DelayMs<u8>>(
+        &mut self,
+        delay: &mut DEL,
+        register: u8,
+        open: bool,
+    ) -> Result<u8, I2cError> {
+        // Set low current before testing
+        self.write_register(Page::Config, addresses::CURRENT_REGISTER, 0x01)?;
+        if open {
+            self.write_register(Page::Config, addresses::PULL_UP_REGISTER, 0x00)?;
+        }
+        delay.delay_ms(10);
+
+        // Trigger detection
+        // OSDE 01 => open  detection
+        // OSDE 10 => short detection
+        let osde = if open { 0b010 } else { 0b100 };
+        let reg = self.read_register(Page::Config, addresses::CONFIG_REGISTER)?;
+        let reg = reg & (!0b110); // Clear OSDE
+        self.write_register(Page::Config, addresses::CONFIG_REGISTER, reg)?;
+        delay.delay_ms(100);
+        self.write_register(Page::Config, addresses::CONFIG_REGISTER, reg | osde)?;
+        delay.delay_ms(100);
+
+        // Read status
+        let status = self.read_register(Page::Config, register)?;
+
+        // Reset high current again
+        //self.write_register(Page::Config, addresses::CURRENT_REGISTER, 0xFF)?;
+        delay.delay_ms(10);
+        Ok(status)
+    }
 }
 
 /// See the [data sheet](https://lumissil.com/assets/pdf/core/IS31FL3741A_DS.pdf)
@@ -221,3 +264,25 @@ pub enum PwmFreq {
     /// 900Hz
     P900 = 0x0B,
 }
+
+#[repr(u8)]
+pub enum SwSetting {
+    // SW1-SW9 active
+    Sw1Sw9 = 0b0000,
+    // SW1-SW8 active, SW9 not active
+    Sw1Sw8 = 0b0001,
+    // SW1-SW7 active, SW8-SW9 not active
+    Sw1Sw7 = 0b0010,
+    // SW1-SW6 active, SW7-SW9 not active
+    Sw1Sw6 = 0b0011,
+    // SW1-SW5 active, SW6-SW9 not active
+    Sw1Sw5 = 0b0100,
+    // SW1-SW4 active, SW5-SW9 not activee
+    Sw1Sw4 = 0b0101,
+    // SW1-SW3 active, SW4-SW9 not active
+    Sw1Sw3 = 0b0110,
+    // SW1-SW2 active, SW3-SW9 not active
+    Sw1Sw2 = 0b0111,
+    // All CSx pins only act as current sink, no scanning
+    NoScan = 0b1000,
+}