stm32f4-discoveryregister level stm32
Read the RM0090 Reference Manual and understand the bit level functionality of the peripheral registers.
For the Cortex-M4 ARM has a TRM, and Joseph Yiu has a series of books that provide alternate perspective.
Have you any other experience programming micro-controllers at this level? Can you leverage that knowledge?
I have programmed 8051 series, pic16f series using registers, I have also used Tiva c(Tm4c123 & Tm4c1294 Launchpads) but for that I used spl in code composer studio so I have no basic Idea of programming ARM using registers.
Also,How to set Keil run time environment for register level programming?
Can you pull in the stm32f4xx.h, or equivalent, file and use peripheral register structures?
VTOR->SCB = 0x08000000;
if (USART1->SR & 0x80) // TXE
USART1->DR = 0x55;
You could create pointers at specific addresses if that is the way you want to do it.
Yes sort of!!!!
Thanks for the Help.
+1 to all Clive said above, except the example
SCB->VTOR = 0x08000000;orif (USART1->SR & USART_SR_TXE) // TXE USART1->DR = 0x55;
I recommend to avoid the "magic numbers". IMO it's better to use the symbols defined in the headers. Unfortunately, ST doesn't properly define values for non-single-bit fields int he registers (I try to pester them for this at all possible occasions :-) ) so I augment my headers.
If you have an STM32F4 DISCO or the related EVAL, this snippet - www.efton.sk/STM32/b.c demonstrates blinking LEDS using timer. (Augmented header www.efton.sk/STM32/stm32f4xx.zip - it's an older version of the header so don't use it for your work, I just give it here as the example of the augmentations). I threw clock or any other than the default C memory clear/init out of my startup code; I know it's there on ARMs insistence but IMO it does not belong there, I do all clocks etc. inits wherever I find it appropriate, usually at the beginning of main().
I don't use Keil (I use CodeBlocks with EPSDebugger, or just plain gcc at times with a simplistic programmers' editor I prefer), so can't speak for that, sorry.
Trying to gauge the level of no library I'm playing to.
I also recommend treating the libraries provided by ST (SPL or HAL) as coding examples.
This may save you some debugging time when accessing the hardware when a specific register access mode is required ( like for example 16-bit access or when read-modify-write operation should be avoided )
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