Goals:

• Build a complete drivers from scratch using:
• Custom register-level drivers (GPIO, UART, ADC, SPI, I2C, SPI)
• No ST HAL libraries (pure CMSIS + bare-metal)
• Modular API design for reusability

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-Feature1_addition

• System Clock: HSI 48MHz configuration via RCC registers
• SysTick Timer: 1ms timebase with overflow-safe delays
• GPIO Driver: Pin mode, alternate function, read/write
• SPI Driver: Possible APIs of read write, Interrupts and status,flags handling
• UART Driver: 115200 baud with printf redirection
• ADC Driver: Internal temperature sensor with factory calibration