Bitwise Operations - MATLAB & Simulink (original) (raw)
This example shows how to implement bitwise operations by using Simulink® blocks, Stateflow® Charts, and MATLAB® Function blocks.
Simulink Bitwise Operator Block
To include a logical operation in your model, use the Bitwise Operator block from the Logic and Bit Operations library.
1. Open example model ex_bit_logic_SL.
The Logical Operator blocks perform an AND operation in the model. To change the operation, double-click the block and set the Operator field to any of the operations in the menu.
2. Double-click the block to open the Block Parameters dialog box.
3. To perform bitwise operations with a bit-mask, select Use bit mask.
If another input uses bitwise operations, clear the Use bit mask parameter and enter the number of input ports.
4. In the Bit Mask field, enter a decimal number. Use bin2dec or hex2dec to convert the input from binary or hexadecimal. In this example, enter hex2dec('D9').
5. To build the model and generate code, press Ctrl+B.
The code implementing the bitwise operator AND is in the ex_bit_logic_SL_step function in ex_bit_logic_SL.c:
/* Exported block signals / uint8_T u1; / '/u1' / uint8_T y1; / '/Bitwise Operator' */
/* Model step function / void ex_bit_logic_SL_step(void) { / S-Function (sfix_bitop): '/Bitwise Operator' incorporates:
- Inport: '/u1' */ y1 = (uint8_T)(u1 & 217); }
Stateflow Chart
1. Open example model ex_bit_logic_SF.
2. Right-click the Stateflow chart to open the chart Properties.
3. Verify that the Enable C-bit operations check box is selected.
4. To build the model and generate code, press Ctrl+B.
The code implementing the bitwise operator AND is in the ex_bit_logic_SF_step function in ex_bit_logic_SF.c:
/* Exported block signals / uint8_T u1; / '/u1' / uint8_T y1; / '/Bit_Logic' */
/* Model step function / void ex_bit_logic_SF_step(void) { / Chart: '/Bit_Logic' incorporates:
- Inport: '/u1' */ y1 = (uint8_T)(u1 & (uint32_T)0xD9); }
MATLAB Function Block
In this example, to show the MATLAB Function block method for implementing bitwise logic into the generated code, use the bitwise OR, '|'.
1. Open example model ex_bit_logic_ML.
2. The MATLAB Function Block contains this function:
function y1 = fcn(u1, u2) %#eml
y1 = bitor(u1, u2); end
3. To build the model and generate code, press Ctrl+B.
The code implementing the bitwise operator OR is in the ex_bit_logic_ML_step function in ex_bit_logic_ML.c:
/* Exported block signals / uint8_T u1; / '/u1' / uint8_T u2; / '/u2' / uint8_T y1; / '/Bitwise OR' */
/* Model step function / void ex_bit_logic_ML_step(void) { / MATLAB Function: '/Bitwise OR' incorporates:
- Inport: '/u1'
- Inport: '/u2' */ y1 = (uint8_T)(u1 | u2); }