Category: STM32F4 Discovery

Library 12- OneWire library for STM32F4 34

Library 12- OneWire library for STM32F4

1-Wire is a device communications bus system designed by Dallas Semiconductor Corp. that provides low-speed data, signaling, and power over a single signal. It’s used in some temperature sensors, like DS18B20 temp sensor and many others products from Dallas. OneWire key features Single Contact Sufficient for Control and Operation Unique ID Factory-Lasered in Each Device Power Derived from Signal Bus (“Parasitically Powered”) Multidrop Capable: Supports Multiple Devices on Single Line Exceptional ESD Performance source: maximintegrated.com 17th May, 2014: There was some new functions added!...

PWM graph 136

STM32F4 PWM tutorial with TIMERs

In this tutorial, I will show you, how to implement PWM outputs on STM32F4xx devices. This is for a lot of people pretty hard work, but believe me, it’s quite quick and easy. I will go step by step on how to make a PWM output on specific timer. Update: I made a library for PWM, available here. STM32F4 timers They have up to 14 timers inside. Table below shows their description. You have to know, that let’s say F401 doesn’t...

Library 09- I2C for STM32F4 126

Library 09- I2C for STM32F4

I2C or Inter-Integrated Circuit is a multimaster serial single ended bus. This protocol is commonly used with RTC modules, temperature sensors, EEPROMs, IO expanders and more. I2C protocol uses 2 wires: SCL: Serial Clock, clock for serial synchronization SDA: Serial data, bidirection line for receving and transmitting Both wires need external pull up resistor, from about 4k7 to 47k, if you don’t use pull up resistors in MCU. In our case, you don’t need external pull ups, because library uses internal in STM32F4.

ILI9341 LCD on STM32F4 267

Library 08- ILI9341 LCD for STM32F4

On STM32F429 Discovery board there is LCD with ILI9341 controller. It has 240 x 320 pixels resolution and 16bit or 18bit color depth, what gives you 65536 or 262144 different colors. It has also a possibility of different way of connection, like serial, parallel, with VSYNC and HYSNC. STM32F429 has also LTDC driver for LCD like that, but this driver we will use later. For now we will use SPI for driving in serial mode and some other pins for controlling. I...

Library 07- DA Converter on STM32F4 17

Library 07- DA Converter on STM32F4

Digital to Analog Converter has inverse function as ADC. It converts digital value in microcontroller to analog value. Library Features Output analog value from STM32F4x Dependencies CMSIS STM32F4xx STM32F4xx GPIO STM32F4xx DAC TM TM GPIO defines.h STM32F4 has 1 DAC with 2 channels output. Table below shows pins for DAC. DAC pins DAC Channel ALIAS Pin APB DAC_Channel_0 TM_DAC1 PA4 1 DAC_Channel_1 TM_DAC2 PA5 1

Simple ADC characteristic 111

Library 06- AD Converter on STM32F4

In this tutorial I will talk about ADC (Analog to Digital Converter). AD converts analog voltage to digital number, that can be used in microcontrollers. STM32F4xx MCUs have up to 3 ADCs of which every has 19 channels. 16 external channels, connected to IO pins 3 internal channels Vbat Voltage on battery pin for RTC Temp sensor unusable for measure temp,only for measure difference in temperature because it can fail up to 45°C Vref Voltage reference for ADC Below is table...