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TurboCobalt/README.md
Sylvain Schneider debd19a8cd minor update
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TurboCobalt

High-Performance Desktop Multi-Tool for Software Developers

📘 Project Specifications

Version: 1.0
Core System: STM32G491 (Arm Cortex-M4F @ 170MHz)
Operating System: FreeRTOS
Development Status: Design Phase
Target Market: Professional Software Development Tools

Table of Contents

💡 1. Concept Overview

TurboCobalt is a high-end desktop multi-tool designed for software developers. It merges retro-analog aesthetics with modern digital power to provide:

  • Analog Monitoring: PC resource tracking (CPU/RAM) via physical galvanometers
  • Audio Synthesis: 2 channel sound engine via I2S protocol
  • Interactive Interface: Graphical LCD and rotary encoder for system navigation
  • Industrial Gateway: USB bridge to fieldbus protocols (CAN-FD, Modbus/RS485)

Key Design Principles

  • Real-Time Performance: FreeRTOS ensures deterministic response times
  • Professional Grade: Industrial-standard communication protocols
  • Developer Focused: Productivity tools integrated into hardware
  • Extensible Architecture: Modular design for future enhancements

🏗️ 2. System Architecture

graph TB
    PC[PC/Host Computer] --> USB[USB-C]
    USB --> MCU[STM32G491<br/>ARM Cortex-M4F]
    
    subgraph MEM ["Memory Subsystem"]
        EEPROM[24LC512<br/>64KB EEPROM]
        PSRAM[APS1604M<br/>16MB PSRAM]
        RTC[DS3231<br/>RTC + Battery]
    end
    
    subgraph ANALOG ["Analog Monitoring"]
        PWM1[PWM + Filter] --> GAL1[CPU Meter<br/>SO-45]
        PWM2[PWM + Filter] --> GAL2[RAM Meter<br/>SO-45]
    end
    
    subgraph AUDIO ["Audio Chain"]
        I2S[I2S Interface] --> DAC[PCM5102<br/>Audio DAC] --> OUT[🎵 Audio Out]
    end
    
    subgraph UI ["User Interface"]
        LCD[128x64 Display<br/>NHD-C12864LZ]
        ENC[Rotary Encoder<br/>+ Button]
    end
    
    subgraph FIELDBUS ["Industrial I/O"]
        CAN_TX[TJA1050] --> CAN_BUS[CAN-FD Bus]
        RS485_TX[MAX485] --> MODBUS[Modbus RS485]
    end
    
    subgraph PWR ["Power"]
        POWER[USB 5V] --> LDO[3.3V Regulator]
    end
    
    MCU -.-> MEM
    MCU --> ANALOG
    MCU --> AUDIO
    MCU --> UI
    MCU --> FIELDBUS
    LDO --> MCU

🔧 3. Component Selection & Rationale

Primary MCU: STM32G491

Selection Criteria Met:

  • Performance: 170MHz ARM Cortex-M4F with DSP instructions
  • Audio Processing: Hardware CORDIC accelerator for real-time synthesis
  • Connectivity: Integrated CAN-FD controller eliminates external chips
  • Memory: 128KB SRAM sufficient for FreeRTOS + audio buffers
  • Package: LQFP-80 provides adequate I/O for all peripherals

Key Advantages:

  • Mathematical accelerator reduces CPU load for audio algorithms
  • Advanced timer units enable precise PWM generation for galvanometers
  • Fast ADC enables potential future analog input expansion

Memory Subsystem

Component Part Number Capacity Interface Purpose Rationale
EEPROM 24LC512 64KB I2C Config Storage Non-volatile, reliable for settings
PSRAM APS1604M 16MB SPI/QPI Audio Buffer & Samples Premium capacity, 144MHz, future-proof

📊 PSRAM Capacity Analysis

Calculated Requirements:

  • Audio Buffers (48kHz, 24-bit, 2ch): ~200KB (multiple buffers + safety margin)
  • Sample Storage: ~10-15MB (extensive soundbanks, high-quality samples, user recordings)
  • Communication Buffers: ~50KB (USB, CAN-FD, Modbus queues)
  • UI Graphics Buffer: ~50KB (advanced display cache, animations, menus)
  • System Overhead: ~200KB (FreeRTOS heap extension)

APS1604M 16MB PSRAM

  • Studio-Grade Capacity: 1000+ high-quality samples (24-bit, 48kHz)
  • Multi-Project Storage: Multiple soundbanks and user configurations
  • Advanced Features: Real-time convolution, complex synthesis algorithms
  • Recording Capability: Store user recordings directly to PSRAM
  • Performance: 144MHz clock - fastest available option
  • Future-Proof: Extensive room for firmware expansion

Audio Chain

DAC Selection: PCM5102

  • 24-bit resolution, 192kHz sampling rate
  • I2S interface directly compatible with STM32
  • Low THD+N: 0.0008% typical
  • Self-clocking eliminates need for external crystal

Analog Indicators

Galvanometer Choice: SO-45 Series

  • Vintage aesthetic with modern reliability
  • Fast response time (<200ms full scale)
  • Linear voltage-to-deflection characteristics
  • Standard 0-5V input range matches PWM filtering

🛠️ 4. Bill of Materials (BOM)

Core Components

Category Component Part Number Specs Rationale
MCU Microcontroller STM32G491RET6 170MHz ARM-M4F, 512KB Flash CORDIC accelerator + CAN-FD integrated
Memory PSRAM APS1604M-3SQR 16MB, 144MHz SPI/QPI Premium audio capacity + performance
Memory EEPROM 24LC512-I/P 64KB I2C Non-volatile config storage
RTC Real-Time Clock DS3231SN ±2ppm, I2C, Battery backup Precision timekeeping
Audio DAC PCM5102A 24-bit, 192kHz I2S Studio-grade audio quality
Display LCD NHD-C12864LZ 128x64, SPI Professional readability
Analog Galvanometer (x2) SO-45 0-5V, <200ms response Vintage aesthetic + reliability
CAN Transceiver TJA1050T CAN-FD compatible Industrial fieldbus standard
RS485 Transceiver MAX485CSA Full-duplex RS485 Modbus communication

Technology Choices Summary

🎯 Key Design Decisions:

  • STM32G491: Best-in-class for audio (CORDIC) + industrial connectivity (CAN-FD)
  • 16MB PSRAM: Premium capacity enabling studio-grade sample storage
  • PCM5102: Professional DAC with excellent THD+N performance
  • SO-45 Galvanometers: Authentic retro aesthetic with modern reliability
  • I2S Audio Chain: Eliminates noise, ensures digital precision to DAC
  • SPI/QPI Memory: High-speed access for real-time audio processing

⚡ 5. Hardware Architecture

🖥️ Processing & Memory

  • MCU: STM32G491 (High-performance, CORDIC math accelerator for audio, integrated FDCAN)
  • EEPROM (I2C): 24LC512 (64 KB) for presets, logs, and persistent configuration storage
  • PSRAM (SPI/QPI): APS1604M (16MB) for extensive audio sample storage and real-time processing
  • RTC: DS3231 for precise alarm and clock functions

🔌 Connectivity & I/O

  • USB: Main USB-C interface supporting Composite Device Classes: CDC (Data) and HID (Keyboard/Control)
  • Audio: I2S bus connected to an external DAC (e.g., PCM5102)
  • Display: Newhaven NHD-C12864LZ (128x64 pixels) via high-speed SPI
  • Indicators: 2x SO-45 Galvanometers driven by filtered PWM (Pulse Width Modulation) outputs

Fieldbus Ports

  • CAN-FD Port: Dedicated connector via TJA1050 (or equivalent) transceiver
  • RS485/Modbus Port: Dedicated connector via MAX485 (or equivalent) transceiver

💻 6. Software Architecture (FreeRTOS Tasks)

The FreeRTOS implementation ensures low-latency audio processing and responsive UI handling by isolating critical tasks.

Task Name Priority Description
Task_Audio 1 (Critical) Signal synthesis and I2S DMA buffer management
Task_USB_Comm 2 (High) USB stack management, receiving PC stats and HID commands
Task_Gateway 3 (Medium) Packet routing between USB and CAN/Modbus interfaces
Task_UI 4 (Medium) NHD display refresh and rotary encoder debouncing/logic
Task_Sensors 5 (Low) Periodic RTC, Temperature, and EEPROM housekeeping

⚙️ 7. Operational Modes

  • Studio Mode: Operates as a standalone synthesizer or MIDI controller
  • Monitor Mode: Visualizes real-time dev-machine performance (CPU/RAM load)
  • Gateway Mode: Acts as a transparent bridge between the PC and industrial buses (CAN/Modbus)
  • Dev-Tool Mode: Physical password vault (HID injection) and Pomodoro productivity timer

🔄 8. System Data Flow Summary

Primary Data Paths

  • PC → USB: Streams CPU/RAM utilization data to the MCU
  • STM32 → PWM: Maps data to voltage levels to move the SO-45 needles
  • STM32 → I2S: Outputs real-time generated waveforms to the audio DAC
  • External Bus ↔ STM32 ↔ USB: Bi-directional data transit for CAN/Modbus debugging

Performance Metrics

  • USB Latency: <1ms for HID commands
  • Audio Latency: <5ms buffer (configurable)
  • Galvanometer Update Rate: 60Hz
  • Display Refresh Rate: 30Hz
  • CAN/Modbus Throughput: Up to 1Mbps (CAN-FD), 115.2kbps (RS485)

📋 9. Technical Specifications

Power Requirements

  • Input: USB-C 5V, 500mA maximum
  • Consumption:
    • Idle: ~150mA @ 5V
    • Active Audio: ~300mA @ 5V
    • Peak (All peripherals): ~450mA @ 5V

Environmental Specifications

  • Operating Temperature: 0°C to +70°C
  • Storage Temperature: -40°C to +85°C
  • Humidity: 10-90% RH, non-condensing
  • Dimensions: TBD (Desktop form factor)

Compliance & Standards

  • USB: USB 2.0 Full Speed compliant
  • CAN: ISO 11898-1 (CAN-FD)
  • RS485: TIA/EIA-485-A
  • EMC: Designed for CE marking compliance
  • Safety: Low voltage, USB powered design

Development Tools

  • RTOS: FreeRTOS v10.x
  • HAL: STM32 HAL Driver
  • Debug: SWD interface with ST-Link
  • Version Control: Git-based workflow
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