cancel
Showing results for 
Search instead for 
Did you mean: 

1-Wire library for STM32 in C

raivo
Associate II
Posted on December 29, 2012 at 08:38

Could not find a ready solution for using 1-wire protocol with STM32 in C (working wiwth IAR), so I decided to rework the C++ library that came with arduino.

So, if anyone needs it - here it is a fully working solution (compiled wit IAR, tested on STM32F103VET6 processor running at 72 Mhz - Delay functions need to be modified for other frequencies). I have not yet add comments to functions in code, but it should not be hard to understand, as it is 1:1 ported from arduino library. Sample code:

OWire OneWire;
unsigned char DeviceAddress[8];
int nCount = 0;
OWInit(&OneWire, GPIOB, GPIO_Pin_14); 
while(OWSearch(&OneWire, DeviceAddress))
{
printf(''Device %d: %02X %02X %02X %02X %02X %02X %02X %02X \n\r'',
nCount+1,
DeviceAddress[7],DeviceAddress[6],
DeviceAddress[5],DeviceAddress[4],
DeviceAddress[3],DeviceAddress[2],
DeviceAddress[1],DeviceAddress[0]);
nCount++;
}
printf(''DeviceCount: %d'',nCount);

Output: 0690X00000602n4QAA.jpg May be someone finds the Delay library useful too. Working on DallasTemp library now - will post here when finished.. Any comments, suggestions are welcome... #1wire #delay #1-wire
14 REPLIES 14
Andrew Neil
Evangelist III
Posted on January 03, 2013 at 16:00

''rework the C++ library that came with arduino''

I guess it's a result of this that the code contains variable declarations intermixed with executable statements - which is allowed in C++, but not in so-called ''ANSI'' C.

Therefore compiling this code will require C++/C99, or some option to ''allow C++ extensions'' - or a bit of reorganisation to move all the delcarations before the code...

http://stackoverflow.com/questions/2896177/mixed-declarations-and-codes

If no-one else beats me to it, I'll post an update sometime...

Andrew Neil
Evangelist III
Posted on December 31, 2012 at 15:17

Why is there no lightbulb icon to ''like'' this contribution??

Muhammad Moiz khan
Associate II
Posted on September 06, 2016 at 17:09

Hello, 

 

Hello, I am using STM32F0 microcontroller and currently implementing DS18S20 using one wire protocol. I am searching for delay and one wire library but not able to find, I have made my own delay library using Systick timer but it is not making precise delay in microseconds?  Help in this regard would be highly appreciated.

slimen
Senior
Posted on September 06, 2016 at 17:42

Hi,

Maybe this

http://stm32f4-discovery.net/2015/07/hal-library-05-onewire-for-stm32fxxx/

is helpful for you.

Regards

Posted on September 06, 2016 at 18:27

For micro-second delays on the CM0 I'd recommend using a TIM configured in a free-running mode, and pacing bus transitions with spin-loops against that.

The micro-controller isn't going to be able to interrupt at 1 MHz, so those types of software counters used by SysTick, etc, are not viable.

On STM32 M3/M4 designs there is also the DWT_CYCCNT often providing nano-second level resolutions.

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..
mahdi zamani
Associate II
Posted on January 28, 2017 at 07:40

can connect two micro stm32f103xxxx whit this protocol ?

have a sample fore this ?

thanks

Posted on January 28, 2017 at 13:07

Not sure this is an efficient way. Wouldn't it be far easier to use a USART and let the peripheral hardware do all the work rather than doing it a bit at a time managing the timing? 

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..
Posted on February 03, 2017 at 11:29

my usart pin used ...

Posted on February 03, 2017 at 13:41

Two suggestions:

1. Use I2c to 1-wire adapter: DS2482

https://www.maximintegrated.com/en/products/interface/controllers-expanders/DS2482-100.html

 

This way you can i2c library for easy handling of 1-wire

2. My favorite solution: connect the 1-wire device to the uart as per maxim app note:

https://www.maximintegrated.com/en/app-notes/index.mvp/id/214

 

This way you can access the 1-wire device the same as you use the uart.

Here is the project in Russion:

http://we.easyelectronics.ru/STM32/stm32-1-wire-dma.html

 

I made a few project using UART for the purpose of handling 1-wire thermometer e.g. DS18B20

Bogdan