This project implements bare-metal drivers for the IS25LP128F serial flash memory and the SerLCD 20x4 display on the STM32L432KC development board. The flash memory is controlled via SPI, and the LCD is driven using I2C, all without relying on STM32 HAL, CMSIS, or any third-party libraries.
| Part | Description |
|---|---|
| STM32L432KC | NUCLEO-STM32L432KC Development Board. |
| IS25LP128F | Serial Flash Memory (SPI). |
| SerLCD | SparkFun 20x4 Serial LCD Display (I2C). |
The main goals of this project are:
- Develop a Fully bare-metal SPI driver for IS25LP128F flash memory.
- Develop a bare-metal I2C driver for the SerLCD 20x4 display.
- Enable direct register-level control of peripherals for maximum efficiency.
- Implement reliable data storage and retrieval from the flash memory.
- Keep the code minimal, optimized, and dependency-free.
The project uses a simple bare-metal scheduler to manage three tasks:
- Task01 (LED Blinking) : Toggles an LED on PB3 every 1 second.
- Task02 (Flash Memory Handler) : Handles SPI flash operations, including erase, write, read, and verification every 5 seconds.
- Task03 (LCD Display) : Displays the current flash operation status on the SerLCD via I2C.
Each task runs based on the time intervals set for it without an RTOS.
To set up the hardware, connect the components as follows:
| Peripheral | Interface | STM32L432KC Pins Used |
|---|---|---|
| IS25LP128F (Flash) | SPI | PA5 (SCK), PA6 (MISO), PA7 (MOSI), PA4 (CS) |
| SerLCD (LCD) | I2C | PB6 (SDA), PB7 (SCL) |
Below is the circuit of the STM32L432KC with the flash memory and LCD display:
