#3. How to Configure UART using REGISTERS || STM32F4
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- Опубликовано: 5 авг 2024
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00:00 Introduction
01:28 Including libraries
05:02 UART Configuration
13:48 Baud Rate setup
18:33 How to send data
20:01 main function begins
21:56 How to receive data 
Наука
I love your videos and want to thank you for what you are doing! you are great!
Really Excellent!!! Very well presented ! Thank you .
Brilliant work...!!!
When I applied it on stm32h7b3, it didn't work. But when I cleared the moder bits before assigning it, it worked. Thanks for no hal library explanation!
great job again, waiting for I2C :)
great job thank you !!!
Great work
Thank you very much
Excelente explicación, HAL lo hace todo más fácil, cuando pueda analice el bus CAN, gracias
Thank you so much, what's the song that you are using in the background?
Thanks -^-
If I connect an Xbee pro S1 module, what kind of changes do I have to make so that it receives data?
thank you a lot for this tuto, please i'm using stm32f429discovery board the register are slightly same as your i did all think correclty but did not get any char on the serial please can you guess what can be the issue
Thank you so much for this useful video. I tried same program in stm32L072 but i am not getting any data. Then one more doubt I have in stm32L0 series, what is the alternate function value in stm32L0, In reference manual not there so I am asking you.
Thank you for the video. I'm struggling with lcd on 4-bit mode. But it works very fine in 8-bit mode. Do you have any lcd libraries for 8 bit mode
Just modify that 4 bit library. In functions, send_cmd and send_data, Instead of sending the data in 2 parts (upper and lower nibble), send a single byte.
Also modify the startup sequence as per the lcd datasheet (you need to remove 1 or 2 statements i guess).
Thank you so much. This series on stm32 || NO HAL is very educational and fun to watch/learn. One question on line 30 (and 31) where GPIOA->AFR[0] is written, but why not GPIOA->AFRL for more explicit expression per reference manual?
AFRL is not a register in the core file.. it's AFR[0]
the convention being used in the reference manual and the code are not the same. That's why the confusion occurs
from where u getting comments code
Thank you for the video, I was looking for it. One question, in your opinion what is the best method to communicate with a GSM module like SIM800 by UART in a FreeRTOS design?
Don't know how to handle that situation with freertos, but without freertos, you can use uart ring buffer to take care of it.
@@ControllersTech Thanks for the reply.
Yes. You can use UART and push AT commands.
i am using nucleo f446re board i used the same code of yours but i am not getting and data from uart2 pins (pin PA2) , i connected arduino and stm32f4 board .
i am getting uart values in tera term terminals but not getting from pins of micro controllers
do i have to do any setup in the board to get uart datas from pins.
solved the problem by SB14,SB13 soldering removed and SB62,SB63 soldered then on board UART worked
Yeah by default uart2 is connected to the usb for communication with PC. That's why i use other uarts for communicating with other devices
Actually he was describing some other issue.
You can't get the uart2 data from pins PA2 and PA3 in nucleo board. Uart2 is directly connected to the stlink usb.
So he did those things to get data from those pins.
Thank you. Do you have a similar tutorial for Bluepill?
The process is identical in bluepill also
You even don't know how sad I become when I realized that your voice is synthesized (after watching more than a few of your videos), I felt like in a movie Her. Nonetheless, I really appreciate your work :)
It's amazing that you realized it now.
Synthesized version is a bit better, as it doesn't have accent issues. Also it's easier for youtube to generate the subtitles in all the languages.
@@ControllersTech Haha, yes, actually my bf pointed it out and I was like - no way that that's not my fav stm32 youtuber voice 😂
If I connect an HC-06 Bluetooth module, what kind of changes do I have to make so that it receives data?
No changes needed
Can u explain about the line in detail
While(! (USART2->SR & (1
It's the same
Can you explain about that line what does it do step by step?
It waits for the 6th bit in the USART_SR register to reset.
Hi...!
I have coded everything right according to my stm32f407DISCOVERY Board. I am able to send string using Hercules, But not able to recieve and send it back. I am having a warning where as your does not. on this Line. Send_String(data); Wrning is "main.c(84): incompatible integer to pointer conversion passing 'uint8_t' (aka 'unsigned char') to parameter of type 'char *' [-Wint-conversion].
1. Is this your first program with registers ? I would highly recommend that you see the first 2 videos and make those work first.
2. You should use breakpoints at different stages in the code to check where it stucks or something.
3. Also make sure the clock setup is right, and you haven't copied exactly what's mine.
Different controllers work at different frequencies. The procedure would be same but values will be different.
4. If doesn't work, contact me on telegram or discord.
USART2->CR1 &= ~(1
yes, thats most right statement
Not sure if someone knows why but I am using an STM32F767ZI which has slightly different registers and I was not able to get the baud rate I wanted. I debugged the issue and I noticed that despite having APB1 peripheral clocks at 54MHz it was capped at 20 MHz and when calculating the proper prescalar for that clock I was able to get the peripheral working.
Whats the voltage scale range ?
@@ControllersTech Sorry I am not too sure where to find that information but I found a section on the "Voltage Regulator" this in the datasheet on page 123.
www.st.com/resource/en/reference_manual/dm00224583-stm32f76xxx-and-stm32f77xxx-advanced-armbased-32bit-mcus-stmicroelectronics.pdf
I also found this on page 115 of this link
www.st.com/resource/en/datasheet/stm32f765bg.pdf
When the regulator is ON, the voltage scaling and over-drive mode are adjusted to fHCLK frequency as follows:
- Scale 3 for fHCLK ≤ 144 MHz
- Scale 2 for 144 MHz < fHCLK ≤ 168 MHz
- Scale 1 for 168 MHz < fHCLK ≤ 216 MHz. The over-drive is only ON at 216 MHz.
Just FYI my clock is at 216MHz and I have not touched these registers so it seems like scale 1 is the reset value. Please let me know if there is anything else I can do to help or if you know where I can find more descriptive information to answer your question.
Did you saw the first video of this series ?
@@ControllersTech Oh whoops yes I did but I set the register to the reset value (0b11) which is scale 3
How can we glow led using usart2 ?
watch the first video and implement it here
you mentioned like writing 0x07 on AFRL7 for USART 1 to 3 but you are writing it on both AFRL6 and 7.i got stuck there lol,can you explain that
I guess you mean at 12:05.
I wrote 7 to the 8th position for AFRL2 ( pin PA2) and at 12th position AFRL3 (pin PA3)
@@ControllersTech you're so great so humble thanks for replaying to my doubt i got cleared about that .Can you suggest which IDE is best for STM32 like IAR or systemworkbench by eclips or Keil.also i am working on SAMD21 thats so complext to understand do have any idea on that
8:46 Why we are using pa2 and pa3 ? how can I underdanst which pin use ?
By checking the schematics of the board. Also check the pin description of the mcu to see which pins can be assigned to which peripheral
@@ControllersTech thank you sir
i did what you said in you video but still it is not working for me
Please help me
look at my comment
👌👌👌👌👌👌👍👍👍👍👍👍👍👍👏👏👏👏
How ST came up the idea to calcutate baudrate. It is so stupid. But there is much simply way to calculate baud rate. Take frequency for UART preiferial divide by preferd baud rate and put trzys walue to the baud register. this walue is the same as this awful method of calculating baud rate according to Reference Manual
Could they have made it any more complicated. I doubt it.