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+---
+sidebar_position: 1
+description: Bitwise operations to interact with hardware registers in Rust
+---
+
+# Bitwise Operations in Rust
+
+When developing embedded software for the **STM32 Nucleo-U545RE-Q**, you are frequently required to configure specific hardware peripherals. Whether you are turning on one of the 5 LEDs or reading the state of the 4 buttons  on your lab board, you communicate with the microcontroller by modifying specific bits within its hardware registers.
+
+Because hardware registers group multiple independent configuration settings into a single 32-bit (or 8-bit) word, you cannot simply overwrite the entire register without risking the disruption of other settings. This is where bitwise operations come in.
+
+## The Anatomy of a Hardware Register
+
+Registers in microcontrollers generally consist of bits grouped by their specific roles. Here is what those bits actually do under the hood:
+
+- **Control bits**: These are used to control different operating modes of the microcontroller or to activate specific hardware components. For example, setting a specific control bit might turn on the UART communication peripheral.
+- **Status bits**: These are generally read-only bits used to check the state of an action or hardware peripheral. For instance, a status bit might turn to `1` automatically when new data has arrived in a buffer.
+- **Data bits**: These bits are used to provide the microcontroller with data to be processed, or to retrieve data from it.
+- **Reserved bits**: These bits are not currently used by the microcontroller. As a general rule in embedded programming, you should never modify reserved bits.
+
+
+## Bit Shifting
+
+Before modifying registers, you need to know how to target a specific bit. We do this by taking the number `1` and "shifting" it to the correct position.
+
+- Right Shift (`>>`): This moves each bit of the operand to the right by a specified number of positions. Zeros are added to the left to maintain the dimension of the number. Mathematically, shifting right is a highly efficient way to divide a binary number by $ 2^n $ in a single operation.
+
+:::info
+
+`1010 >> 1 = 0101` (In decimal: 10 divided by 2 becomes 5).
+
+:::
+
+- Left Shift (`<<`): Moves bits to the left, filling the empty spaces on the right with zeros. Shifting left by n is mathematically equivalent to multiplying by $ 2^n $.
+
+:::info
+
+`0011 << 1 = 0110` (In decimal: 3 multiplied by 2 becomes 6).
+
+:::
+
+## Modifying Registers
+
+Here are the primary operations you will use daily to manipulate bits without corrupting the rest of the register.
+
+### Setting Bits (Making them `1`)
+
+To set a specific bit to `1` while leaving the rest of the register untouched, we use the bitwise **OR** (`|`) operator.
+
+- **Set a single bit**: `register | 1 << bit`
+- **Set multiple bits**: `register | bits`
+
+### Clearing Bits (Making them `0`)
+
+To clear a specific bit to `0`, we use a combination of the bitwise **AND** (`&`) and bitwise **NOT** (`!`) operators.
+
+- **Clear a single bit**: `register & !(1 << bit)`
+- **Clear multiple bits**: `register & !bits`
+
+### Toggling / Flipping Bits
+
+If you need to invert the current state of a bit (change `1` to `0`, or `0` to `1`), use the bitwise **XOR** (`^`) operator.
+
+- **Flip a single bit**: `register ^ (1 << bit)`
+- **Flip multiple bits**: `register ^ bits`
+
+## Value Extraction(Masking)
+
+Often, a hardware register contains a specific multi-bit "field" (like a 4-bit configuration value) packed into a larger 32-bit word. To read just that field, you need to shift the bits down to the zero position and apply a **Mask** to zero-out everything else.
+
+Here is a practical example of extracting a specific portion of a 32-bit ID:
+
+```rust
+// We define a mask that isolates the bottom 12 bits
+const MASK: u32 = 0b0000_0000_0000_0000_0000_1111_1111_1111;
+
+fn main() {
+    // A 32-bit register value
+    let large_id: u32 = 0b1100_1010_1111_1100_0000_1111_0110_1101;
+    
+    // 1. Shift right by 20 to bring the target bits to the bottom
+    // 2. Apply the AND mask to clear all upper bits
+    let extracted_bits = (large_id >> 20) & MASK; 
+
+    // Result: 00000000_0000_0000_0000_1100_1010_1111 
+}
+```
+
+## Common Pitfalls
+
+Bitwise operations are prone to logical typos. Watch out for these common errors:
+
+:::warning 
+
+Using the assignment operator (`=`) instead of the compound bitwise operator (`|=` or `&=`).
+
+- **Wrong**: `register = 1 << 4` (This wipes out the entire register and only sets bit 4)
+- **Correct**: `register |= 1 << 4` (This preserves the rest of the register while setting bit 4).
+
+:::
+
+:::warning 
+
+Do not confuse **logical** operators with **bitwise** operators!
+
+- `&&` and `||` evaluate truthiness (e.g., `true && false`)
+- `&` and `|` perform mathematically accurate bit-by-bit operations (e.g., `0b1100 & 0b0101 = 0b0100`).
+
+:::