ChibiOS Free Embedded RTOS

Hello,

I am using MMC SPI to log float values to microSD card using STM32F4 MCU and Chibios 2.6.5.
I have mostly followed demo from chibios. I am using snprintf() function to convert float to string and then write them file.
This method works perfectly when I call write function from main thread. However when I call this write function from any other static thread, I get 0 and -268156 values written on SD card and none of expected value.
I have added syscall.c to makefile.
Am I missing something? Is there any difference in the execution of main thread and any other static thread?

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Nikhil

Probably a stack overflow, libraries are not exactly designed for embedded.

Giovanni

Any suggestion for alternate solution to this issue?

Use chsnprintf()?

Giovanni

Tried using chsnprintf() but it also gives 214748368s and 0s instead of desired values.


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Nikhil

You are looking for the wrong thing then.

Giovanni