1. ARM Cortex-M3 and Cortex-M4 Processors
Chapter21. DSP Applications
학부연수생
최문식

2. Contents DSP on a microcontroller Dot product example
Cortex-M4 DSP instructions

3. DSP on a microcontroller
Digital Signal Processing(DSP)
Lower power consumption.
Ease of integration.
Lower overall system cost.

4. Dot product example

5. M3, the inner loop Takes 10 to 14 cycles M4, the inner loop
Cortex-M3
M3, the inner loop
Takes 10 to 14 cycles
Cortex-M4
M4, the inner loop
Takes 7 cycles

6. Cortex-M4 DSP instructions
Registers

7. Data types

8. Fractional arithmetic

9. 8-bit fractional values -> “q7_t” 16-bit fractional values -> “q15_t”

10. SIMD(Single Instruction Multiple Data)

11. Load and store instructions in CMSIS library
8-bit
16-bit

12. Arithmetic instructions SSAT – signed saturation

13. SMMUL – 32bit multiply returning 32 most significant bits

14. SMMLA – 32bit multiply with 32 most significant bit accumulate

15. Floating-point instructions