ES_Synth Report

Group Peaky Blinders’ report for the ES_synth project.

Table of Contents

• updateKeys Task
• updateDisplay Task
• decodeMessage Task
• CAN_TX_TASK
• CAN_TX_ISR
• CAN_RX_ISR
• sampleISR

Advanced features implemented

• Octaves
• UI
• Polyphony
• Tones
• Metronome
• Video

Task categorisations and characterisations

Task	Functionality	Implementation Type (interrupt/thread)	Initiation Interval (ms) Aka deadline	Worst-case execution time (ms)
updateKeys	Reads and updates all input variables in system state	thread	25.2	0.53425 (17096 us for 32)
updateDisplay	Outputs UI onto display	thread	100	16.778 (536898 us for 32)
decodeMessage	Loads oldest message in received queue into system state variable	thread		0.009875 (316 us for 32) note: we had to fill up the msgin queue to be able to run the function otherwise the queuereceive blocked the function
CAN_TX_Task	Transmits oldest message in transmitting queue over CAN bus	thread		0.01 (30 us for 3) ran the test 3 times
CAN_TX_ISR	Gives the semaphore to signal when a new transmission can be sent	interrupt		0.0026667 (8 us for 3) had to change the give from ISR to just give ran the test for 3 times
CAN_RX_ISR	Places a received message onto the received queue	interrupt		0.99333 (2980 us for 3) had to set loopback to true to make 3 calls of CAN_TX to fill up the mailbox had to change the queuesendfromISR to just queuesend ran the test for 3 times
sampleISR	Based on the current system state (notes pressed, octave, tone, etc) output value to speaker	interrupt	0.0455	0.0155 (496 us for 32)

Critical instance analysis

$$\lceil \dfrac{100}{25.2} \rceil * 0.53425 + \lceil \dfrac{100}{100} \rceil * 16.778 + \lceil \dfrac{100}{25.2} \rceil * 0.3555 + \lceil \dfrac{100}{60} \rceil * 0.36 + \lceil \dfrac{100}{60} \rceil * 0.104 + \lceil \dfrac{100}{25.2} \rceil * 0.99333 + \lceil \dfrac{100}{0.0455} \rceil * 0.00155 \le 100$$

Dependency diagram