join. was and with me. Let's discuss..

Besides, a comparison to show timing difference between using and not using DMA is also mentioned. I also used this library at the first time and found it was quite difficult to get the most updated gyro data for calculation. So, I got the wrong gyro angle all the time. Moreover, I noticed that the code took lots of time to read 14 bytes of data including 6 bytes acceleration, 2 bytes of temperature and 6 bytes of gyronearly 2ms, so there is no chance to get the sample rate at 1ms.

Again, Stdperiph driver V3. Here, we finish setting up the MPU sensor. From now on, the sensor will run with the following configuration:. This means for example if the sensor is rotated in X axis with maximum angular velocity of degrees per second, the gyro X data will be maximum value of 16bit integer variable: In the other hand, the readout value will be if the angular velocity is degrees per second. Fire interrupt signal when data is available.

Clear interrupt flag whenever the data is completely read out. We have some important points to notice here in order for you to be able to edit the code yourself in the future if you use a another I2C peripheral or different type of sensor with different byte to transfer through DMA:.

As you can see from the two tables from STM32F1 reference manual, there are 2 DMA blocks connected to different type of peripherals using different channels. Then, for reading data, we need to consider channel 7 that is connected to the RX register of I2C1 where all incoming data is stores. Later, if you want to use other peripherals with DMA in your own project, this table can be useful. Each peripheral inside the STM32 has a boundary address which can be found in Table 3 of the reference manual.

And inside that peripheral, there are several registers whose address are inside that peripheral boundary. After finishing the configuration parts, we move to the reading part. The interrupt routine is as follow:. Now, the reading sequence will be done automatically and store into AccelGyro variable with the minimum time needed. I have also done a timing test to check how efficient this method could be.

stm32 i2c dma example

Following figures show the timing consume of two method: regular reading and DMA reading. Fig: regular I2C reading. Fig: DMA supported reading. With the normal way of reading I2C data, CPU is busy for the whole period and cannot do anything else. This could lead to delay in reading other sensor data as well. The interupt routine is in the receiver.

What is the physical peripheral address: Each peripheral inside the STM32 has a boundary address which can be found in Table 3 of the reference manual.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

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STM32F4 Discovery board - Keil 5 IDE with CubeMX: Tutorial 10 I2C - Updated Dec 2017

Viewed 5k times. What I do is: I initialize sensor using poll method and it works fine. Now I'd like to read 32 bytes using DMA. What other parameters should be sent then? Active Oldest Votes. Sign up or log in Sign up using Google.

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I have some problems with I2C2 interrupts, I have enabled the interrupt but the handler interrupt never executes. Okay, so you've listed your interrupt config and handler, but what about your I2C initialization in-general?

stm32 i2c dma example

Note: Using a set of define 's perhaps in a header during configuration makes life easier. For example:. Read through the "How to Use This Driver" comment at the top. Learn more. Asked 6 years, 7 months ago. Active 1 year, 6 months ago. Viewed 23k times. BR, Edgar. I'm trying to set up a slave i2c with interrupts and having a hard time given my background in not electrical.

Can you give a reference that helps me understand how you did the setup? A github repository will be the best. Active Oldest Votes. You won't be generating any interrupts if the I2C isn't initialized.

If you already have all this in your project, post it so we can see what you've done there. I have already had the initilization code. I have changed from i2c3 to i2c2 but still does not work.

I see that you edited your post to include your init code, but didn't see this listed. Give it a try. I will give it a try as soon as possible. I will let you know. Sign up or log in Sign up using Google.

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stm32 i2c dma example

By clicking "Accept Cookies", you give your consent to their usage. Your Privacy. Strictly Necessary Cookies. Performance Cookies. Functional Cookies. Targeting Cookies. Cookie Policy. Privacy Preference Centre. Can anyone give me an example code to config, init and send and receive data through the I2C bus. Hi did you solve your problem if yes please send me the sample code for i2c stm32f Let's try and think this through and supply enough detail in the question so people not inside your head can figure out what you're using?

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Using the I2C Interface on the STM32 Devices

Privacy Preference Centre Active. Save Settings. Allow All. ST Community. Enter relevant keywords and click the Search button View This Post. Posted on May 28, at now im trying in this way.

Posted on May 29, at OK,I found the problem. Need to convert the Slave address to 7 bits. It would be helpful for me to change that code to work on RTC. Please click on the provided URL to read the original post. Posted on June 11, at Which RTC chip are you using? What specific STM32 part are you attempting to attach this too?

Sorry for the before post. Thanks in advance. This question is closed.Such an easy to remember and descriptive name, I know! So onwards with the tutorial! Other than certain parts, the I2C protocol consists of a lot of flag checking to check the current status of the bus. I2C is a really neat protocol that uses two bus lines SDA — serial data and SCL — serial clock in an open drain configuration and can address up to devices on the same bus! As I2C is open drain, two pull up resistors are required.

Due to this asymmetrical behaviour, an I2C signal will have a much larger rise time than fall time due to bus capacitance and the time taken for it to be charged by these pull up resistors. Remember however, the above value is not inclusive of any overhead such as returning the internal register pointer back to the first register, the X value.

This was mainly because I had them to hand and they strike a good middle ground between power consumption and rise time, along with being a relatively low impedance. The HMCL is a pretty simple device and only has a handful of registers which are really easy to modify to your specification. The HMCL contains three main registers for setting the parameters within the chip, namely: Config register 1, config register 2 and mode register. Config register 1 contains the settings for the sample averaging, the output rate and measurement configuration if you require sensor bias.

Lets get on with some coding. As per usual, we want to declare out top of file parts, the HMC defines, included files and structs. Either way, shifting up by 1 sorts the problem!

STM32F0 I2C - Tutorial 7 with STM32CubeMX

So prepare yourself for the next two I2C functions. I have used an I2C function to write to registers and read from registers. Sorry about the awful code formatting, the wordpress code block doesnt allow for very long lines! I hope the code is pretty self explanatory in the commenting so I shall continue on.

If you have any questions, just ask! For time keeping, two pretty standard functions are used — the SysTick interrupt handler function which increments a millisecond variable and a delay function that operates the NOP instruction until x milliseconds have passed. As with standard code structure, next comes main! It also sets up the SysTick interrupt handler at 1ms.

stm32 i2c dma example

Constant variables are used to store the register configurations and hopefully the names are pretty self explanatory! The registers are written to, then a small delay is present before the reading on the device occurs. To test whether the sensor was actually working, I used the standard debug mode within Coocox.

By rotating my breadboard with the sensor on, I can view the change in these values and determine the position of local magnetic fields!

The initial configuration using the two 4. Hopefully a better view of the two 4. And again!

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And finally, slot the chip in! You can see the 4. As stated previously, I did all my testing using the debug feature in Coocox. Its really simple to use, you literally just click the debug icon, wait for it to do its stuff, set a breakpoint and monitor your variables!

So in simple steps:. Step 1: Press the debug button and you shall be transported to the magical realm of debugging. The initial debugging screen once the debug icon has been pressed. Once the debug initialization is complete, you will be met with this screen, now to step 2!

This will ensure that all three values are read before the program pauses. Adding a breakpoint is really easy!Being occupied by all the courses and my research, I hardly had time to continue with the STM32F0 tutorial series I started almost two years ago.

Hence, I thought that I need to spent some time to continue with this tutorial series to finish all the basic peripherals. If you are not familiar with I2C, I suggest that you take a look at the tutorial on Sparkfun website and come back here with these information in mind:.

I2C1 possible pin mapping.

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I2C2 possible pin mapping. Analog and Digital noise filter feature Analog and Digital noise filter: their benefits and drawbacks. In HAL library, there are several functions that provide us an easy solution to program I2C communication, particularly for Master mode. In this tutorial, I will only mention the normal communication without using interrupts and DMA.

Hence, for master transmitting and receiving, we can classify the functions into 2 groups as following:. HDC temperature and humidity sensor. You can take a look at the tutorial video below where I did pretty much all the explanation for this sensor and how to connect and read data from it through I2C connection. Therefore, in this tutorial, I will be covering the following parts: Some basic ideas of the I2C and when we need to use it.

Start condition can be issued multiple times repeat start in case a master wants to retrieve more data from slaves. Only the slave which has the same address sends the ACK back to the master. Some of the differences between these two modules are extracted from the datasheet of the F chip and presented in the table below. Based on the specifications of the targeted I2C sensor, the frequency is chosen accordingly. The benefits and drawbacks of each filter are presented in Table 87 below.

Analog and Digital noise filter feature Analog and Digital noise filter: their benefits and drawbacks 3. HDC temperature and humidity sensor You can take a look at the tutorial video below where I did pretty much all the explanation for this sensor and how to connect and read data from it through I2C connection.Moderators: barthessRoccoMarco.

Quick links. I looked at all the examples in the testhal directory for the 2. When I do a write with read set to 0, I do not get any errors. Calling this with that 4 replaced to 0 generates no errors. I am not sure if what I am seeing is my other threads interrupting this one which they should, as they are the ADC thread and a timer that I need to be very accurate.

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My thought was, if I moved this to DMA, then the interrupts would not affect the transfer. Any thoughts on what I could be doing wrong? There also appears to be a bit of ringing around zero state, maybe I need to clean that up I just shut off the ADC and the timer and still getting that Ack error on read.

STM32 F0 and F3 are not affected by this. If so, on my next board revision I can certainly change to one of the others. I switched out the 1. I also made sure I had the pins set correctly from the page you posted which they were correct already, but reset them in code again just to be SURE. This is probably why I am not getting an ACK signal back. I'm trying to wrap my head around how the ACK is getting generated, how the hand off to the bus is working.

I know I've used this exact part before in this configuration, although I was using 2. F0 and F3 have a new peripheral. I'm using the F which is newer, but maybe not new enough they fixed problems. I've shut everything else off in the code just to see what was happening, still not working.

Reading other posts, I see others having similar issues and the selected resistance making a HUGE difference in what worked and what didn't. Guess I will have to experiment with that since nothing else jumping out at me. All voltages look good. Code: Select all chThdSleep. What version are you using? This working when I was using the 2. I had copied the code, that's why I was surprised when it didn't work. Jump to.