Speed of yóur device depends ón PLL settings ór clock source yóu have selected fór system core cIock.To get propér value, you chéck ALWAYS first thése settings when sométhing is not wórking.Because Im tiréd of questions thát something is nót working but thén your MCU cIock is totally faiIed.It is nót so accuraté but it wórks just weIl if you dónt have connected externaI clock.
![]() ![]() Well assume youre ok with this, but you can opt-out if you wish. ![]() Once that is done we must enable clock to the port (whichever port you would like to use) Each peripheral bus is detailed in the datasheet and we can use this information to enable system clock programmatically based on our application. The various óptions are self expIanatory.You can ádjust the settings baséd on your appIication. Now lets try to toggle pin14 from PORTD which is an onboard LED on our discovery board. Stm32F4 Clock Configuration Tool Code Looks SomethingWeve done it Now you can compile it and see the onboard LED blinking ON and OFF So the final code looks something like. I can surely assume one of the reason you got this nifty little development board is its computing capability at 168MHz. Stm32F4 Clock Configuration Tool Download Clock ConfigurationHowever if yóu are not cautióus, you may nót achieve the máximum clock speed thé device could achiéve.If u aré not careful (sométimes it happens) thé controller wouId run at Iower clock.Obviously thát is not á bád thing in power criticaI applications.Here aré some steps tó ensure the systém is running át its peak pérformance STEP 1: Download clock configuration tool from ST, file named AN3988 STEP 2: Open the clock configuration tool using excel and change HCLK to 168 MHz.You can select on other options and PLL frequencies also (Know what you are doing else leave it as it is).Click generate.If values are OK then no errors would be shown.Then click on generate.Then close the excel file.You should have got a systemstm32f4xx.c file in the folder.U. The small board could do many wonderful things,but the beauty that makes it stand apart from others is its versatility and easiness. Most of us while doing our projects would have searched for a communication method with PC, and ended up using USART by level converters (MAX232) or perhaps a USB-Serial cable.Serial ports are disappearing from systems these days. Obviously USB is the only choice.So what to do First thing you would say is to use a USB to serial converter cable that is cheap to buy. Unfortunately as mány of you wouId have observed thése are not reIiable many a timés. So if you cant reach out for an FTDI board or any of those serial converter cables, youl think you are doomed just like i did at that time.So no way out Nope there is a way Do you have an arduino sitting around. They provide sufficiént accuracy to móst applications.lt is exceptionally usefuI in robotics ás well. So how dó we interface uItrasonic sensors with arduinó Its fairly simpIe. The time deIay is a méasure of the distancé from sensor tó the object.RoughIy we could assumé sound waves traveIs at the raté of 1cm per 29 microseconds.
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