STM32 Tutorial : Clock, AHB & APB Buses configuration (Part2: Writing the Code)

[@YeliseiMelnichuk]

I have some problems with English listening because I'm from Russian-speaking country, but I understand your speaking very good. Your lessons is very informative. Thanks.

[@ridhoazharmegantara757]

ithink u may use subtitle in english

[@SmokeDankTrees]

This is extremely clear and helpful. Thank you very much. Please do more!

[@eugeneroh3003]

Really helpful to understand the clock system. For some videos, I was having a tough time to understand the concept, but this video provides the figures and flowcharts which suggest the entire context to understand very clearly. Thank you

[@dipankarpanda8414]

Mr. TizanaMen Yo, you have done a really great video here. All steps are very very clear. Really impressive. Thanks a lot.

[@Minas841]

Thank you very much. I have struggled with the initial steps and you were very helpful. Please keep posting videos like this one.

[@ericL5302]

This is a great video. A very hand-on approach. Thanks!

[@ajinkyabansod5169]

Very thoroughly explained.. I'd like to suggest keeping same volume for audio effects and your voice. Thank you for making this.. :)

[@Nanaki278]

Thank you so much. Finally I figured out this "PLL". In total, it was to look in the reference manual and read that PLLN can not be less than 192. Actually because of this, nothing wanted to start. = ^ _ ^ =

[@pavelonetchiq106]

great explained STM32F4 clocks settings. Thank you.

[@RuwanthaPushpika]

really great tutorial... thank you.. it's quite hard to find a good tutorial like this.... :)

[@abinjohnthomas3079]

Great tutorial....I has been looking for it ....very clear explanation. Thanks you

[@EdwinFairchild]

Amazing amazing amazing! You just help me understand some very difficult concepts. thank you very much , even though i am using Amtel Sam microcontrollers i still understood a lot!!!!!!!!!!! I will check out the Stm32 boards

[@MuhammadSalman-gv6mx]

Wonderful Explanation, Thank you very much

[@hakanaydnbh]

it's very useful video. it has allow me understand what PLL is. Thank you for this video.

[@giannisloukovitis1256]

Thank you. Very nice explanation of everything

[@frankaalbers1099]

Thanks ! This really helped. Following is an update using HAL library coding. The idea is still exactly the same though. For the STN32F401RET6 / SysCLK = 84 Mhz /* Set Oscillator and clock structures */ RCC_OscInitTypeDef RCC_OscInitStruct; RCC_ClkInitTypeDef RCC_ClkInitStruct; /* HSE = 8 Mhz , HSI = 16 Mhz */ /* Enable HSE Oscillator 8 Mhz */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; /* Settings to get PLL frequencies of and */ RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; /* HSE devider. Result needs to stay between 1 and 2 Mhz */ /* PLLM output = 8 Mhz / PLLM = 1 Mhz */ RCC_OscInitStruct.PLL.PLLM = 8; /* PLLMout multiplier. Result needs to stay between 192 and 432 Mhz */ /* The actual PLLN number can aslo only be between 192 and 432 */ /* PLLN0ut = PLLMout * PLLN = 336 Mhz */ RCC_OscInitStruct.PLL.PLLN = 336; /* PLLNout devider for SysCLK. Devider can only be 2, 4, 6 or 8 */ /* SysCLK = PLLNout / 4 = 84 Mhz */ RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4; /* PLLNout devider for USB OTG FS. Between 4 and 15 */ /* USB = PLLNout / 7 = 48 Mhz */ RCC_OscInitStruct.PLL.PLLQ = 7; /* Check if oscilators are OK when setting */ if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers*/ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; /* AHB = SysCLK / 1 = 84 Mhz */ /* This can be DIV1, 2, 4, 8, 16, 64, 128, 256, 512 */ RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; /* APB1 = SysCLK / 2 = 42 Mhz */ /* This can be DIV1, 2, 4, 8, 16 */ RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2; /* APB2 = SysCLK / 1 = 84 Mhz */ /* This can be DIV1, 2, 4, 8, 16 */ RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; /* wait state for Vdd = 2.7 to 3.6 SYSCLK = 84Mhz is 2 (see datasheet) */ if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { Error_Handler(); }

[@rostislavjandejsek2665]

Really clearly explained, thanks!

[@sbylk99]

Great tutorial! very informative!

Great tutorial, thanks a lot!

[@berkanonderkaramelek8866]

Thank you so much for your explanation! Really useful and full of information :)

[@EmbSysDev]

Thank you very much! Please do more! Also if you could do some tutorials on using AC6,would be great.

[@muratpinar7478]

Excellent, thank you.

[@emretuncay394]

thank you this is very benefitial for me.

[@markrussell5587]

So great THANKS!!

[@binhvuthanh5080]

so amazing!!! Thank you.........

[@marianojb7]

Awesome!! Thanks

[@naasikhendricks1501]

this Course is good in the info department. it would be nice if you have more Labs Session using Library from Scratch.

[@tolgacansabah1310]

thanks for video

[@phankhanh8444]

Many thanks sir

[@saranzeb2183]

how to create the empty project i cant find the link ?

[@javijap424]

Hi TizanaMenYo, great tutorial! what program have you used to make the PLL diagram animation?

[@TizanaMenYo]

i used adobe after effects

[@krish2nasa]

Thank you

[@dilipsilga]

Great

[@massimilianogilli1164]

Why should a developer choose a lower frequency ? Is it due to power consumption? Moreover why should a developer use the external oscillator direclty rather than the PLL path?

[@jonnyreh001]

Isnt there error? This is nonsence ... RCC_GetFlagStatus(RCC_FLAG_PLLRDY == RESET); Mabye you ment this: ? while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);

[@gabrielezampieri9221]

was about to comment about that. Of course the compiler doesn't give error becouse seems that the param is in a valid range (should be 0) so de functionality of the CPU could be instable. Your solution is the right one. while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); //wait until RCC_FLAG_PLLRDY is resetted Just a note: avoid this kind of waiting becouse the cpu wastes cycles, do it in that way only when there's no other option. This is a valid context to use a blocking cycle ;)

[@EmbSysDev]

Yes,I was about to post a query on this,and then saw these posts. Surprising how he made an error on this,because otherwise it is an excellent tutorial!

[@bincheng2203]

nice! Thanks!

[@oas3610]

Thank you very much.

[@deadpoems]

Sorry my friend im begginer in this, anyone can aswer to me if st has no software for programming? thank you

[@youssefelmzaiti3201]

hello , how configure a mapping please

[@alextrezvy6889]

Next time, please, set lower resolution on your screen during recording.

[@adambzh]

really like the video, but there just too much emmmmmm, hmmmmmmmmmm, ahhhhhhhhhhhhhhhhhhh