Ask questions, find answers, and share insights on STM32 products and their technical features.
Posted on April 15, 2015 at 18:02Hi, I have several time strict TIMER ISR and I tested the execution time of one of them.The result is that 47 instructions(indluding 3 branch instructions) costs 3 us.My chip is stm32f103 and all code and data is...
Posted on April 15, 2015 at 09:36i am going to use 16 bit wide data bus in high speed (roughly 20mhz). so theoretically, i need to use one port? the problem is the lqfp100 package that the chip has, have all the port pins scattered. none of the port...
Posted on April 10, 2015 at 12:25I'm using a stm32f429 running at 144MHz and I wanted to implement a periodic two-channel adc conversion. I need to make the conversions on a 1us period and I'm considering in using a dma adc conversion. I know how to...
Posted on April 15, 2015 at 15:23I am using the STM32F429 and are using a timer in output compare mode. It works as expected, except that it toggles the output on overflow as well as compare. Is there some way to disable this behavior? I am using th...
Posted on April 12, 2015 at 16:50Hello everyone! I am using STM32F103RET for my project. I need to communicate by SPI with a low speed digital device with the speed of at most 1KHz clock. At the same time, I need to have my own cpu clock as high as ...
Posted on April 14, 2015 at 15:33Hi,I want to use external SRAM with the controller STM32F429. i want to make use of internal supervisor circuit, which is used to power the internal RTC and internal 4Kb SRAM, to backup the data in external SRAM. for...
Posted on April 14, 2015 at 13:47I have setup a timer in PWM input mode. It all works well. I have setup the prescaler and period counter so I can measure down to 10 Hz. But if the input frequency is too low (< 10 Hz) the timer will wrap around.If I...
Posted on April 14, 2015 at 21:51 Hello, I have function fifo_read(RxFifo, &rx, 1) which reads byte from FIFO buffer. I want to use this function in two different interrupt handlers. I have declared rx variable as fo...
Posted on April 14, 2015 at 23:01I've made several custom STM32F4 boards.Never any problems, until now, when my JLINK detects my board ONLY, if I press reset button before I press detect device in Keil uVision.When I press download button I got erro...
Posted on April 14, 2015 at 17:03How can I disable RTC 512Hz signal and return PC13 as I/O ??I programed the PC13 as ''GPIO_AF_RTC_50Hz'' to calibrate the 512Hz signal of internal RTC, but now I cant disable it to use PC13 as I/O, The STM32F205 doe...
