ChibiOS Free Embedded RTOS

Hi,

You have to verify if there are conflicts on the USB pins, that baseboard does have such problems. USB is well known to work on the normal F4 Discovery.

Giovanni

Yes, it works on mine with the stm32f4 board files too, even with the embest board mounted. It stops working when I use a ...

Yes, I found one and eventually I got it to compile. There was some confusion with the CMSIS api (which header file should be included where).

I used the board file from this demo: http://forum.chibios.org/phpbb/viewtopic.php?f=14&t=1589&p=14728&hilit=fatfs+embest#p13710

However, the demo didn't ...

I'm trying to use the embest board (STM32F4DIS-BB) with the SMT32F4-discovery kit. Though it is mentioned in the forums, I can't find anything concrete.
So, my question it, what do I need to do to make it work. Do I need to create new board files (board.h/board.c)? Any pointers would be greatly ...

I'm trying to compile ff9b.zip with ChibiOS 2.7 (I belive. Cloned it a few days ago). I get this compile error

Compiling ccsbcs.c
../hsens/ChibiOS-RT/ext/fatfs/src/option/ccsbcs.c:497:2: error: #error This file is not needed in current configuration. Remove ...

I know the FPU is enabled and working because the scheduler is able to save/restore the FPU registers. Probably this is more a compiler-related issue.

Note that the FPU only supports single floats (32 bits), if you use float/double types then you are using an sw implementation.

Giovanni

Yes, I ...

It is possible that complex functions like sqrt are not implemented as single flu instructions so a library call is generated. Libraries should be compiled to use the fpu anyway.

Giovanni
I will have to look into the library question, but how come the result only reflects the first call (sqrt(10 ...

When I compile my code with

USE_OPT += -mthumb -march=armv7e-m -mfloat-abi=hard -mfpu=fpv4-sp-d16


I get completely wrong results. Example,

mlaFL = (float)sqrt((float)10.0f);
mlaFL = (float)sqrt(mlaFL);
mlaFL = (float)sqrt(mlaFL);
mlaFL = (float)sqrt(mlaFL);
mlaFL = (float)sqrt(mlaFL ...

Ok. My bad. I didn't apply the change to RBIT() consistently. This code works !!! Thanks a lot


#define crcReset() (CRC->CR = 1)
#define crcRead() (__RBIT(CRC->DR) ^ 0xFFFFFFFF)
#define crcWrite(x) {CRC->DR = __RBIT(x);}
uint32_t
crc32(uint32_t *p, int len)
{
int i;
crcReset();
for ( i = 0; i ...

I've defined these macro in my crc header file


#define crcReset() (CRC->DR = 1)
#define crcRead() (__REV(CRC->DR) ^ 0xFFFFFFFF)
#define crcWrite(x) {CRC->DR = __REV(x)}


__REV is a macro defined in the CMSIS (core_cminstr.h I think...). It is a wrapper around the rbit instruction.



it ...

Can you post some code of what you've tried?

Sure. Here goes,


/*
* STM32 header files
*/
#include <stm32_rcc&#46;h>
#include <stm32f4xx&#46;h>
uint32_t
crc32(uint32_t *p, int len)
{
int i;
CRC_TypeDef *CReg;
CReg = (CRC_TypeDef *)CRC_BASE;
CReg->CR = (uint8_t)1;
for ( i = 0; i < len; i ...