new

src/lib/mod.rs

@@ -72,6 +72,15 @@ impl PortIO {
         }
     }
 
+    /// The memory address of the digital enable (DEN) register for this port
+    fn digital_enable(&self) -> *mut u32 {
+        match self.port {
+            Port::A => registers::gpio::den::PORT_A,
+            Port::F => registers::gpio::den::PORT_F,
+            _ => todo!(),
+        }
+    }
+
     /// The memory address of the data (DATA) register for this port
     fn data(&self) -> *mut u32 {
         match self.port {
@@ -145,6 +154,7 @@ impl PortIO {
 }
 
 impl PortIO {
+    // TODO: refactor into private setup_pins function
     pub fn setup_readable_pins<const N: usize>(
         &self,
         bits: &[Bit; N],
@@ -197,13 +207,36 @@ impl PortIO {
             }
         }
 
-
-        // TODO: finish
-
+        // Configure pull-up and pull-down resistors
         match options.pull_up {
-            Some(true) => todo!(),
-            Some(false) => todo!(),
-            None => todo!(),
+            Some(true) => {
+                unsafe {
+                    memory::set_bits(self.pull_up_select(), &bits.map(|bit| bit as u32));
+                }
+            },
+            Some(false) => {
+                unsafe {
+                    memory::set_bits(self.pull_down_select(), &bits.map(|bit| bit as u32));
+                }
+            },
+            None => {
+                unsafe {
+                    memory::clear_bits(self.pull_up_select(), &bits.map(|bit| bit as u32));
+                }
+                unsafe {
+                    memory::clear_bits(self.pull_down_select(), &bits.map(|bit| bit as u32));
+                }
+            },
+        }
+
+        match options.function {
+            Function::Digital => unsafe {
+                memory::set_bits(self.digital_enable(), &bits.map(|bit| bit as u32));
+            },
+            Function::Analog => unsafe {
+                memory::clear_bits(self.digital_enable(), &bits.map(|bit| bit as u32));
+            },
+            _ => todo!(),
         }
 
         let data_address = self.data();
@@ -280,6 +313,16 @@ impl PortIO {
             },
         }
 
+        match options.function {
+            Function::Digital => unsafe {
+                memory::set_bits(self.digital_enable(), &bits.map(|bit| bit as u32));
+            },
+            Function::Analog => unsafe {
+                memory::clear_bits(self.digital_enable(), &bits.map(|bit| bit as u32));
+            },
+            _ => todo!(),
+        }
+
         let data_address = self.data();
 
         let pins: [WritablePin; N] = bits.map(|bit| WritablePin { data_address, bit });

src/main.rs

@@ -78,26 +78,26 @@ fn setup_port_f() {
     //     ptr::write_volatile(GPIO_PORTF_AFSEL_R, 0x00);
     // }
     // enable pull-up on PF0 and PF4
-    unsafe {
-        ptr::write_volatile(GPIO_PORTF_PUR_R, 0x11);
-    }
+    // unsafe {
+    //     ptr::write_volatile(GPIO_PORTF_PUR_R, 0x11);
+    // }
     // 7) enable digital I/O on PF4-0
-    unsafe {
-        ptr::write_volatile(GPIO_PORTF_DEN_R, 0x1F);
-    }
+    // unsafe {
+    //     ptr::write_volatile(GPIO_PORTF_DEN_R, 0x1F);
+    // }
 }
 
-fn input_from_port_f() -> u32 {
-    unsafe {
-        ptr::read_volatile(GPIO_PORTF_DATA_R) & u32::from(SW1 | SW2)
-    }
-}
+// fn input_from_port_f() -> u32 {
+//     unsafe {
+//         ptr::read_volatile(GPIO_PORTF_DATA_R) & u32::from(SW1 | SW2)
+//     }
+// }
 
-fn output_to_port_f(value: u8) {
-    unsafe {
-        ptr::write_volatile(GPIO_PORTF_DATA_R, u32::from(value));
-    }
-}
+// fn output_to_port_f(value: u8) {
+//     unsafe {
+//         ptr::write_volatile(GPIO_PORTF_DATA_R, u32::from(value));
+//     }
+// }
 
 #[entry]
 fn main() -> ! {
@@ -106,6 +106,7 @@ fn main() -> ! {
 
     let switches = port_f.setup_readable_pins(&[Bit::Zero, Bit::Four], ReadablePinSetup {
         function: Function::Digital,
+        pull_up: Some(true),
     });
     let [sw1, sw2] = switches.pins();