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Usart Polling

Posted on April 13, 2012 at 13:28Hi, why i have to enable USART1->CR1 |= USART_CR1_RXNEIE; for polling In Example of ST Lib i dont see such thing. I thought for polling i dont need this?

STM32F207 Usart DMA RX Interrupt

Posted on April 26, 2012 at 21:20dear all, I'm working with the microcontroller STM32F207, below there is my function to configure the DMA in order to acquire 3 characters from USART2 and have the interrupt when those 3 characters arrived. Unfortuna...

momede by • Associate II
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Startup Clock HSI

Posted on May 01, 2012 at 17:29I'm simply looking to have the STM32F4 startup using the HSI clock (at the default 16MHz).  How best can this be accomplished (if it's not already default).  What clock does the STM32F4 natively startup using?  I was t...

Startup Problem

Posted on April 05, 2012 at 01:00Hi, I need some ideas on a problem I'm experiencing.I have an STM32F2xx based product (an automotive sensor of sorts) which has just started field testing. The electrical interface to the product is 4 wires - +V, GND...

carl2399 by • Associate III
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PUTCHAR_PROTOTYPE

Posted on May 02, 2012 at 03:04 #ifdef __GNUC__ /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf set to 'Yes') calls __io_putchar() */ #define PUTCHAR_PROTOTYPE int __io_putchar(int ch) #else #define PUTCHAR_PROTOTY...

Large external RAM

Posted on April 30, 2012 at 00:58Hi guys.I have been playing with Stm32f4 discovery for couple months.My problem follows like this;I have to take 2 vga images from CMOS camera and store them.I will make some mathematical operations on both images.An...

F4Discovery using UART1

Posted on March 26, 2012 at 16:03Hi, I not having much success with using the UART (USART1) on my F4Discovery board (STM32F407). I am pretty new to STM32 and Keil (the IDE I am using). Here's my code: &sharpinclude ''stm32f4_discovery.h'' &sharpincl...

I2C address timeout: how to close communication correctly

Posted on April 21, 2012 at 11:27Hi there,I'm trying to implement an enumeration test on the I2C bus with my own driverbut I haven't figured out how to deal with a timeout on the address.After I send the address of the slave, if nobody respond withi...

salvatore by • Associate II
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  • 6 replies
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RTC Autowake Up & Hard Faults

Posted on April 30, 2012 at 19:54I'm running into a strange issue where if I have the RTC auto-wakeup enabled, I intermittently get hard faults when I run the software through the debugger, break, then step through the code. Seems to happen more fre...

shotaro by • Associate II
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