evovch / stm32-lcd_pcd8544

Simple library for STM32 to work with the PCD8544 LCD display (a.k.a. Nokia 5110)

STM32-LCD_PCD8544

Configure your MCU using STM32CubeMX.

SPI baud rate has to be 4 MBits/s. Adjust it using the Prescaler depending on you MCU base frequency.

figure1

Add 3 GPIO_Outputs for CE, DC, and RST pins of the LCD. It is convenient to locate them close to each other.

figure2

Suitable for (tested on) the very popular cheap Chinese boards STM32F103C8T6 "Blue Pill", STM32FxCxT6 Board v5.02, and STM32F407VET6 - STM32 F4VE V2.0.

Example of usage:

#include "lcd_pcd8544.h"

...

  // LCD
  extern LCD_PCD8544_screen_t gLcdScreen;

  // LCD - assign SPI interface and pins
  gLcdScreen.mPinout.mSpiHandle = &hspi3;
  gLcdScreen.mPinout.mLcdSpiRstPort = LCD_RST_GPIO_Port;
  gLcdScreen.mPinout.mLcdSpiRstPin = LCD_RST_Pin;
  gLcdScreen.mPinout.mLcdSpiCePort = LCD_CE_GPIO_Port;
  gLcdScreen.mPinout.mLcdSpiCePin = LCD_CE_Pin;
  gLcdScreen.mPinout.mLcdSpiDcPort = LCD_DC_GPIO_Port;
  gLcdScreen.mPinout.mLcdSpiDcPin = LCD_DC_Pin;
  gLcdScreen.mPinout.mLcdSpiDinPort = LCD_SPI_DIN_GPIO_Port;
  gLcdScreen.mPinout.mLcdSpiDinPin = LCD_SPI_DIN_Pin;
  gLcdScreen.mPinout.mLcdSpiClkPort = LCD_SPI_CLK_GPIO_Port;
  gLcdScreen.mPinout.mLcdSpiClkPin = LCD_SPI_CLK_Pin;
  gLcdScreen.mPinout.mLcdErrorLedPort = LCD_ERROR_LED_GPIO_Port;
  gLcdScreen.mPinout.mLcdErrorLedPin = LCD_ERROR_LED_Pin;

  // LCD - initialize
  LCD_PCD8544_init(&gLcdScreen);

  // LCD - welcome screen
  LCD_PCD8544_write_line(&gLcdScreen, 0, "Privet!");
  HAL_Delay(1000);
  
...