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Microcontroller load

Posted on April 21, 2014 at 11:17How do I calculate/decide the clock frequency of a microcontroller and load it can take?for example, if a controller is capable of 32MHz clock frequency, with 4UARTs, USB host, 2 I2C & SPI, 20 GPIOs, an LCD controlle...

STM32F4 APB1 Prescaling Issue

Posted on April 19, 2014 at 10:54Hi all, I'm curious about prescaling APB1 for the STM32F4. I'm building a triangle wave generator and frequency meter, for which it is conveniant for me to have a high as possible clock frequency for Timers 4 and 6....

Wrong STM32 clock at startup

Posted on March 31, 2014 at 15:44Hello, I have a problem similar to the one discussed in the post named ''STM32F103RB - Different Clock Speed Between Reset?''https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=ht...

MarcoM by Associate II
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stm32f4 discovery wrong core clock

Posted on January 27, 2014 at 19:37I'm new on stm32 development and I could be wrong. I try to test the real core clock of my Stm32f4 discovery, using a modified example of IO_Ttoggle project of  STM32F4-Discovery_FW_V1.1.0, using startup_stm32f4xx...

fabio23 by Associate
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Overdriving LSI oscillator by external oscillator

Posted on August 23, 2013 at 15:06Hi everyone,I overdrive the low-speed internal oscillator by external source with a small offset and small swing.Where can I find parameters for external clock(without bypassing LSI osc)?Thanks.Eugene #lsi #oscil...

st2399 by Associate
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problem on watchdog

Posted on August 05, 2013 at 14:51Hi everbody,I'm using a ST32F205VE. On my board, I'm using the internal watchdog of the microcontroller and an external watchdog (MCP1318T).During normal operation, the �c sends square pulses every 0.5s to the exter...

missing ADCPRE configuration in systeminit() ?

Posted on June 03, 2013 at 16:57Hello everybody, I set up the (new) 3.5.0 lib in our project and configured the clock (via &sharpdefine SYSCLK_FREQ_36MHz  36000000) but the ADCPRE register did not get configured correctly. I'm missing the part where...

konrad by Associate
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MCO1 output doesn't output anything

Posted on February 21, 2013 at 23:36Hello all,Can someone help me please?I must be doing something wrong because I can't do something so trivial...I'm trying to output HSI over MCO1, it must be something straightforward, but...void cpu_init_mco( voi...

cherobim by Associate
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HSI Clock Configuraion

Posted on January 28, 2013 at 22:38Hi,I'm using stm32f10xc4, low density value line, it supports an HSE of 8 MHz, my hardware has 20 MHz which is wrong and that's the reason why the clock configuration doesn't go properly - i guess -.So i tried to g...

sherif by Associate II
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