Sometimes you need watchdog timer to look at your system if it gets stuck. I made a little library to work with it. Watchdog in STM32F4xx device has it’s own clock which is independent from main system clock. You have to constantly reset it’s counter value or it will elapse and reset MCU. Watchdog Library Features Detect if system was reset by watchdog Supports different timeouts Reset watchdog
It’s been some time when I post last library. Next one is internal RTC library. STM32F4xx devices have Real Time Clock (RTC) inside, with support of internal calibrated 32768 Hz oscillator or external (more accurate) 32768 Hz oscillator. RTC peripheral has also backup register support, which means that when you reset MCU, registers are not reset or if power is off and you have battery connected on Vbat pin, clock is still working. RTC can also wakeup MCU from all...
Today I’ve modified USART library. My library uses receive interrupt. After that, it just save data into cyclic buffer. User actually don’t know when that happen. Today, I was working on some project, where I need to know exact time, when data arrived on USART. For that purpose, I’ve modified USART library. To be able to know exact time when data arrived, you have to add defines in your defines.h file:
//Enable custom receive interrupt handler for each USART
//Enable for USART1 and so on
//Put only this defines, you want to use
Then, you have to manually create a function...
It’s been a while when I first got ILI9341 lcd working on discovery, but without LTDC driver. Yesterday I decided to make a new library. With LTDC, you can actually display movies, because it uses parallel communication and support 2 layers simultaneously what gives you a high refresh rate. I used my old ILI9341 library and just add/modify some things to get LTDC to work. LTDC also supports 2 layers, so this means that while one layer is displayed, other layer...
17th library is here. I will show how to basic communicate with 2 nRF24L01+ RF transceivers. The Nordic nRF24L01+ is a highly integrated, ultra low power (ULP) 2Mbps RF transceiver IC for the 2.4GHz ISM (Industrial, Scientific and Medical) band. With peak RX/TX currents lower than 14mA, a sub μA power down mode, advanced power management, and a 1.9 to 3.6V supply range, the nRF24L01+ provides a true ULP solution enabling months to years of battery life from coin cell...
16th library is here. We will interfacing HD44780 (and its compatible) driver for alpha-numeric LCDs. Library supports up to 20 x 4 LCD size. It was tested with 20 x 4 (on picture) and with 16 x 2. HD44780 Library Features 4bit operation mode Minimum GPIOs used (6) Supports different LCD sizes Supports up to 8 custom characters Enable/disable cursor blinking Show/hide cursor Shift content in ram left/right Connection pins to board are user selectable Automatically jumps to new line...