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drv_io_timer Add simplified Oneshot API

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1) Define IOTimerChanMode_OneShot
   2) Added detailed commnent on .clock_freq and how it is used
   3) Added single additional API point in support of Onshot mode
      io_timer_trigger - That trigger all timer's channels in Oneshot
      mode to fire the oneshots with updated values.
This commit is contained in:
David Sidrane 2017-03-02 16:47:34 -10:00 committed by Lorenz Meier
parent b01768addc
commit 96db91c468
1 changed files with 8 additions and 14 deletions
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22
src/drivers/stm32/drv_io_timer.h
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@ -1,6 +1,6 @@
/****************************************************************************
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
* Copyright (C) 2012, 2017 PX4 Development Team. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -65,11 +65,12 @@ typedef enum io_timer_channel_mode_t {
typedef uint8_t io_timer_channel_allocation_t; /* big enough to hold MAX_TIMER_IO_CHANNELS */
/* array of timers dedicated to PWM in and out and capture use
*** Note that the clock_freq field must be set to the frequency (in Hz) of the selected clock.
*** Normal PWM timers set the prescaler to achieve a counter frequency of 1MHz
*** and OneShot PWM timers set the prescaler to achieve a counter frequency of 8MHz.
*** These counter frequencies are specified (in MHz) in array timer_freq[MAX_IO_TIMERS].
*** Beware that legacy code *assumes* that the counter frequency is 1MHz.
*** Note that the clock_freq is set to the source in the clock tree that
*** feeds this specific timer. This can differs by Timer!
*** In PWM mode the timer's prescaler is set to achieve a counter frequency of 1MHz
*** In OneShot mode the timer's prescaler is set to achieve a counter frequency of 8MHz
*** Other prescaler rates can be achieved by fore instance by setting the clock_freq = 1Mhz
*** the resulting PSC will be one and the timer will count at it's clock frequency.
*/
typedef struct io_timers_t {
uint32_t base;
@ -115,7 +116,6 @@ __EXPORT int io_timer_channel_init(unsigned channel, io_timer_channel_mode_t mod
channel_handler_t channel_handler, void *context);
__EXPORT int io_timer_init_timer(unsigned timer);
__EXPORT void io_timer_set_oneshot_mode(unsigned timer);
__EXPORT int io_timer_set_rate(unsigned timer, unsigned rate);
__EXPORT int io_timer_set_enable(bool state, io_timer_channel_mode_t mode,
@ -129,12 +129,6 @@ __EXPORT int io_timer_is_channel_free(unsigned channel);
__EXPORT int io_timer_free_channel(unsigned channel);
__EXPORT int io_timer_get_channel_mode(unsigned channel);
__EXPORT int io_timer_get_mode_channels(io_timer_channel_mode_t mode);
/**
* Force update of all timer channels
*
* @param timer The timer to force.
*/
__EXPORT extern void io_timer_force_update(void);
__EXPORT extern uint8_t io_timer_get_freq(unsigned timer);
__EXPORT extern void io_timer_trigger(void);
__END_DECLS