ChibiOS Free Embedded RTOS

Found this old post while searching for support for Bit Banding in ChibiOS. This is a generic macro that seems to do the job: #define BB_(periph) (&(periph) + (PERIPH_BB_BASE - PERIPH_BASE)/sizeof(uint32_t)) Here's an example of its usage: void stepperReadyCB(EXTDriver *extp, expchannel_t pad) /...

Hi, I just spent a few days fighting to get a new board to reset reliably. One of the problems encountered was due to the board's having a 1kOhm resistor in series with its 3.3V power input until bypassed by a FET under software control. This was done to limit inrush, as up to sixty of these boards ...

I've been running Chibios 2.6.10 with lockless queues from some months now. There was a race in the examples I posted earlier. Here's the current working code for fast queue reading: /** * @brief Input queue read with timeout when no other reader thread exists * @details The function reads data from...

In my previous post, I forgot to include the definition of overcap referenced in the revised interrupt service routine:

I've added support for TIM10 and TIM11 to the ICU driver. Because TIM10 and TIM11 lack the 2nd compare register the ICU driver normally uses, I've also had to add support for an additional input mode: /** * @brief ICU driver mode. */ typedef enum { ICU_INPUT_ACTIVE_HIGH, /**< Trigger on rising edge....

Hi, [Note that I'm working with 2.6.10, but I have verified that all this valid for 17.x as well] The ICU driver's interrupt handler ends with the following statement: if ((sr & STM32_TIM_SR_UIF) != 0) _icu_isr_invoke_overflow_cb(icup); This causes the overflow handler, if registered, to be call...

I propose adding a polled output mode so panic messages can be output on a serial port with interrupts disabled. This gives some feedback as to the cause of a crash in situations where no debugging probe is installed. Here's a hacked up example for the STM32v1 serial drivers: /** * @brief Switch to ...

ChiBiOS threads support thread local storage between the Thread struct and the thread's stack (which typically grows down toward the Thread struct). These thread local variables are handy and worked great until I tried using it on mainthread. Then, instant segfault panic, because the mainthread's Th...

Just adding another vote for a polled output mode in serial drivers so that panic messages can be output when no debugger is attached. I hacked this into the STM32L serial drivers, but there's no reason it couldn't be done more generically: /** * @brief Switch to polling mode (disable interrupts) * ...

How can the existing counter be made a single byte if the queue size > 255 bytes? I suppose the "counter" could be reduced to simple flag that gets set when the fifo becomes full and cleared when it becomes empty. Is this what you have in mind? As far as FIFO full/empty tests, I don't see ...