ChibiOS Free Embedded RTOS

Hi all,
I want to use Timer in counter mode, but I don't find how to config to use external clock for Timer. Please help me.
Thanks in advance.

Hi all,
I'm using PWM in STM32. I read in pwm.h file:

I don't understand the "output modes mask" of PWM. Please explain to me.
Thanks in advance.

Hi all.
I've studied ChibiOS for some weeks. I used to work with CMSIS library on STM32 microcontroller. I have a question: Can I use CMSIS library in ChibiOS to work with STM32?
Sorry if my question is stupid.
Thanks in advance.

Thank you very much. I understand now. This forum is very helpfull. I like it.

Thank you very much for your help. I don't understand much about deadlock but my code can work now (I can send and receive message with a thread).

Hi all. I have a problem with MailBox. I don't know what is the different between two functions of MaiBox:
chMBPostAheadS (Mailbox *mbp, msg_t msg, systime_t time)
//Posts an high priority message into a mailbox.
chMBPostAheadI (Mailbox *mbp, msg_t msg)
//Posts an high priority message into ...

Hi all, I need help about MailBox. I create two thread. One post message, another fetch message, when it receive message, it with turn on or turn off LED3 (I'm using STM32l-Discovery). Here the code I used and it done well (LED3 on or off as I expected).
#include "ch.h"
#include "hal.h ...

Giovanni, thank you very much. I can solve problem now.

I have a STM32L-Discovery kit. I want to control the brightness of Led4 (connect with pin PB6). I used this code:
#include "ch.h"
#include "hal.h"

static PWMConfig pwmcfg = {
10000, /* 10kHz PWM clock frequency. */
10000, /* Initial PWM period 1S. */
NULL,
{
{PWM_OUTPUT ...