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Forum Posts

FFT function oddities

Posted on August 09, 2013 at 10:42I'm using the ''arm_cfft_radix4_f32(&S, FFTData); '' function to obtain the FFT of an array and then inverse it back after some processing. I have things working, to a point, but with some odd restrictions. Firstl...

STM32F4 USART PROBLEM

Posted on August 09, 2013 at 20:18Hello, everyone.  I am currently playing around with the USART without standard peripheral lib provided by ST (using CMSIS only) and my code strangely works in one MDK project and does not work in another MDK projec...

ran2 by Associate III
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AT commands for HTTP

Posted on August 12, 2013 at 09:10Hi all,I am using HILO GSM modem of Sagem. It supports HTTP feature. I am implenting that feature in my device but i am facing problem while using POST and GET commands related to HTTP. I am using AT commands to imp...

manoj23 by Associate II
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Quadrature Encoder Channels

Posted on August 09, 2013 at 20:11I'm working with the STM32F3 Discovery board.  I'm wondering if it is possible to use a timer in encoder interface mode with the signals coming in on Channels 1 and 4.  Do you have to use channels 1 and 2?  Does the...

mattfox by Associate II
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Current Consumption of STM32L-DISCOVERY in low Power Modes

Posted on August 11, 2013 at 19:23Hi, I am using the STM32L-DISCOVERY evaluation board, and I made JP1 off as per the below instructions from the evaluation board user manual:  JP1 OFF: the STM32L152 is directly powered, IDD measurement circuit is b...

HSI vs. HSE crystals

Posted on August 11, 2013 at 19:01I've been looking at some board designs that I've found online, and it looks like some people include an external 8 MHz crystal in a resonator to run their clock.  I'm wondering what the benefit of using this extern...

mattfox by Associate II
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stm32f3 PWM Input latency

Posted on August 10, 2013 at 09:28Hello together, i´m just asking in case someone had the same issue and knows the answer - of course i don´t want u to read the manuals for me... So, i´m using the PWM input feature on Timer2 and in general it wo...

GNU gcc toolchain on linux

Posted on August 10, 2013 at 00:33Hi all,I've been playing with different peripheral examples of STM32L-Discovery on MDK-ARM (Keil) environment.  Recently I'd like to move to linux with GNU gcc tool chain.  I had a hard time learning to write a Make...

GPIO_Remap_SWJ_Disable Issue

Posted on August 08, 2013 at 23:20 Hey guy's ! [I'd like to apologize for my bad englisch] I think I've made two mistakes in a row... First, I designed a STM32 Board with the usage of the Pin PA.15 - which is remapped after ...

benedikt by Associate II
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CMSIS DSP PID Algorithm and 1.15 format

Posted on August 10, 2013 at 04:51Hello, I am having a problem with CMSIS DSP. the state variables are represented in 1.15 format.I want to control the speed of a motor using PID algorithm.The minimum value of the PWM duty Cycle is 500 and it Maximu...