YC3121 Thermal Printer Firmware Development -- 2

Title: Embedded Firmware Engineer - YC3121 Thermal Printer Development

Description:
We need an experienced embedded firmware engineer to develop thermal
printer firmware for YC3121 MCU (ARM Cortex-M based). The project
involves creating ESC/POS compatible printer firmware using existing
reference code and manufacturer SDK.

Requirements:
5+ years embedded C programming
ARM Cortex-M MCU experience (STM32, NXP, or similar)
FreeRTOS development experience (2+ years)
USB device stack implementation experience
Hardware driver development (GPIO, SPI, UART, Timer, ADC)
Keil MDK or IAR Embedded Workbench experience
Strong debugging skills (J-Link, logic analyzer)

Project Scope:
- Develop ESC/POS compatible thermal printer firmware
- Integrate YC3121 SDK drivers (provided)
- Implement USB printer communication
- Print buffer and print head control
- Motor control and sensor integration

Timeline: 4-6 weeks
Budget: $1,000 - $1,500

Deliverables:
- Complete source code (well-commented)
- Working firmware binary
- Project documentation
- Test report

What We Provide:
- Complete YC3121 SDK
- Reference firmware code
- Hardware for testing
- Technical documentation

Please Include:
- Portfolio with embedded projects (GitHub preferred)
- Code samples showing hardware drivers and RTOS usage
- Brief explanation of your approach
- Timeline estimate
- Rate/budget