Category: STM32F4 Discovery

Library 38- External interrupts for STM32F4 31

Library 38- External interrupts for STM32F4

A new library is here. 38th are external interrupts. This library allows you to very easly use external interrupts for your needs with just one function and function handler. I have written everything you need to start. For more informations on how external interrupts works on STM32F4 with pins and lines and so on, you should look at my external interrupts tutorial. I tried explain there everything as best as I can. I think it’s quite understandable. I will just...

Precise delay with counter 8

Precise delay with counter

If you work at high speed, as STM32F4 devices do (84MHz or more) then this tutorial is not right for you. But, you are able to descrease system speed to any frequency basicly you want. If you want to use delay with systick down timer, look at my library here. You can use great solution, Systick timer to make an interrups for you. But you can also decrease speed to let’s say 42Mhz, and that systick every 42ticks checks for...

Program STM32F4 with UART 14

Program STM32F4 with UART

STM32F4 devices have great feature. They can be programed with only USB to UART converter. Each device has bootloader inside, which supports UART programming. This is not very great method for Discovery boards, because they have better and faster solution on board, ST-link. But if you are working own board, then this solution can be quite nice. In this tutorial, I will go through step-by-step how to program device with USB->UART converter. I will use FTDI’s home made converter. This...

BMP-180 Pressure sensor 27

Library 37- BMP180 pressure sensor for STM32F4

BMP180 is a digital pressure sensor, with builtin temperature sensor. Its range is between 300 and 1100 hPa (0.3 to 1.1Bar). In relating to the sea level, this is +9000 to -500 meters. Sensor works with I2C communication at 100kHz. If you want sensorĀ from ebay, here is one link. Sensor is quite bad created, because if you want to read pressure, you first need to read current temperature for pressure calculation. To read temperature you have to wait at least...

Square wave 10kHz 28

Library 36- DAC Signal generator for STM32F4

For FFT project purpose, I needed simple, really simple signal generator. I don’t have separate device at home, so I made one with STM32F4. DAC Signal library uses timer for output generation and DMA forĀ transferring data from memory to DAC peripheral. So this library does not use processor for controlling. Everything is behind the scenes. You can use 4 different signal waves: Square Sawtooth Triangle Sinus They are simple, predefined signals. You can adjust signal frequency for specific wave. I...

Library 35- LIS302DL or LIS3DSH accelerometer 62

Library 35- LIS302DL or LIS3DSH accelerometer

Maybe you’ve noticed one chip between four leds on STM32F4-Discovery board. This chip is accelerometer. On market, there are 2 versions of STM32F4-Discovery board. First release had LIS302DL (old board) and new release (current) has LIS3DSH device. LIS3DSH has 5 selectables full scales (2/4/6/8/16G), old LIS302DL has only 2 (2.3/9.2G). I made a simple library which supports both devices. Library automatically recognize connected device, if there is any. You just have to check which is on board, because different devices...