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LibrePilot/flight/PiOS/STM32F10x/pios_ppm_out.c

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/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_PPM PPM Output Functions
* @brief Code to output a PPM receiver signal
* @{
*
* @file pios_ppm_out.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
* @brief PPM Input functions (STM32 dependent)
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pios.h"
#ifdef PIOS_INCLUDE_PPM_OUT
#include "pios_ppm_out_priv.h"
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#define PIOS_PPM_OUT_MAX_DEVS 1
#define PIOS_PPM_OUT_MAX_CHANNELS 8
#define PIOS_PPM_OUT_FRAME_PERIOD_US 22500 // microseconds
#define PIOS_PPM_OUT_HIGH_PULSE_US 400 // microseconds
#define PIOS_PPM_OUT_MIN_CHANNEL_PULSE_US 1000 // microseconds
#define PIOS_PPM_OUT_MAX_CHANNEL_PULSE_US 2000 // microseconds
enum pios_ppm_out_dev_magic {
PIOS_PPM_OUT_DEV_MAGIC = 0x0e0210e2
};
struct pios_ppm_out_dev {
enum pios_ppm_out_dev_magic magic;
const struct pios_ppm_out_cfg * cfg;
uint32_t triggering_period;
uint32_t ChannelSum;
uint8_t NumChannelCounter;
uint16_t ChannelValue[PIOS_PPM_OUT_MAX_CHANNELS];
uint8_t supv_timer;
bool Tracking;
bool Fresh;
};
static bool PIOS_PPM_Out_validate(struct pios_ppm_out_dev *ppm_dev)
{
return (ppm_dev->magic == PIOS_PPM_OUT_DEV_MAGIC);
}
#if defined(PIOS_INCLUDE_FREERTOS)
static struct pios_ppm_out_dev * PIOS_PPM_OUT_alloc(void)
{
struct pios_ppm_out_dev * ppm_dev;
ppm_dev = (struct pios_ppm_out_dev *)pvPortMalloc(sizeof(*ppm_dev));
if (!ppm_dev) return(NULL);
ppm_dev->magic = PIOS_PPM_OUT_DEV_MAGIC;
return(ppm_dev);
}
#else
static struct pios_ppm_out_dev pios_ppm_out_devs[PIOS_PPM_OUT_MAX_DEVS];
static uint8_t pios_ppm_out_num_devs;
static struct pios_ppm_out_dev * PIOS_PPM_alloc(void)
{
struct pios_ppm_out_dev * ppm_dev;
if (pios_ppm_out_num_devs >= PIOS_PPM_OUT_MAX_DEVS) {
return (NULL);
}
ppm_dev = &pios_ppm_out_devs[pios_ppm_out_num_devs++];
ppm_dev->magic = PIOS_PPM_OUT_DEV_MAGIC;
return (ppm_dev);
}
#endif
static void PIOS_PPM_OUT_tim_edge_cb (uint32_t tim_id, uint32_t context, uint8_t chan_idx, uint16_t count);
const static struct pios_tim_callbacks tim_out_callbacks = {
.overflow = NULL,
.edge = PIOS_PPM_OUT_tim_edge_cb,
};
int32_t PIOS_PPM_Out_Init(uint32_t *ppm_out_id, const struct pios_ppm_out_cfg * cfg)
{
PIOS_DEBUG_Assert(ppm_id);
PIOS_DEBUG_Assert(cfg);
// Allocate the device structure
struct pios_ppm_out_dev *ppm_dev = (struct pios_ppm_out_dev *)PIOS_PPM_OUT_alloc();
if (!ppm_dev)
return -1;
ppm_dev->magic = PIOS_PPM_OUT_DEV_MAGIC;
*ppm_out_id = (uint32_t)ppm_dev;
// Bind the configuration to the device instance
ppm_dev->cfg = cfg;
// Set up the state variables
ppm_dev->triggering_period = PIOS_PPM_OUT_HIGH_PULSE_US;
ppm_dev->ChannelSum = 0;
ppm_dev->NumChannelCounter = 0;
// Flush counter variables
for (uint8_t i = 0; i < PIOS_PPM_OUT_MAX_CHANNELS; i++)
ppm_dev->ChannelValue[i] = 1000;
uint32_t tim_id;
if (PIOS_TIM_InitChannels(&tim_id, cfg->channel, 1, &tim_out_callbacks, (uint32_t)ppm_dev))
return -1;
// Configure the channels to be in output compare mode
const struct pios_tim_channel *chan = cfg->channel;
/* Set up for output compare function */
switch(chan->timer_chan) {
case TIM_Channel_1:
TIM_OC1Init(chan->timer, &cfg->tim_oc_init);
TIM_OC1PreloadConfig(chan->timer, TIM_OCPreload_Enable);
break;
case TIM_Channel_2:
TIM_OC2Init(chan->timer, &cfg->tim_oc_init);
TIM_OC2PreloadConfig(chan->timer, TIM_OCPreload_Enable);
break;
case TIM_Channel_3:
TIM_OC3Init(chan->timer, &cfg->tim_oc_init);
TIM_OC3PreloadConfig(chan->timer, TIM_OCPreload_Enable);
break;
case TIM_Channel_4:
TIM_OC4Init(chan->timer, &cfg->tim_oc_init);
TIM_OC4PreloadConfig(chan->timer, TIM_OCPreload_Enable);
break;
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}
switch (chan->timer_chan) {
case TIM_Channel_1:
TIM_ITConfig(chan->timer, TIM_IT_CC1 | TIM_IT_Update, ENABLE);
break;
case TIM_Channel_2:
TIM_ITConfig(chan->timer, TIM_IT_CC2 | TIM_IT_Update, ENABLE);
break;
case TIM_Channel_3:
TIM_ITConfig(chan->timer, TIM_IT_CC3 | TIM_IT_Update, ENABLE);
break;
case TIM_Channel_4:
TIM_ITConfig(chan->timer, TIM_IT_CC4 | TIM_IT_Update, ENABLE);
break;
}
TIM_ARRPreloadConfig(chan->timer, ENABLE);
TIM_CtrlPWMOutputs(chan->timer, ENABLE);
TIM_Cmd(chan->timer, ENABLE);
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Prescaler = (PIOS_MASTER_CLOCK / 1000000) - 1;
TIM_TimeBaseStructure.TIM_Period = ((1000000 / 100) - 1);
TIM_TimeBaseInit(chan->timer, &TIM_TimeBaseStructure);
switch(chan->timer_chan) {
case TIM_Channel_1:
TIM_SetCompare1(chan->timer, ppm_dev->triggering_period);
break;
case TIM_Channel_2:
TIM_SetCompare2(chan->timer, ppm_dev->triggering_period);
break;
case TIM_Channel_3:
TIM_SetCompare3(chan->timer, ppm_dev->triggering_period);
break;
case TIM_Channel_4:
TIM_SetCompare4(chan->timer, ppm_dev->triggering_period);
break;
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}
return 0;
}
void PIOS_PPM_OUT_Set(uint32_t ppm_out_id, uint8_t servo, uint16_t position)
{
struct pios_ppm_out_dev *ppm_dev = (struct pios_ppm_out_dev *)ppm_out_id;
if (!PIOS_PPM_Out_validate(ppm_dev) || (servo >= PIOS_PPM_OUT_MAX_CHANNELS))
return;
// Don't allow positions that are out of range.
if (position < PIOS_PPM_OUT_MIN_CHANNEL_PULSE_US)
position = PIOS_PPM_OUT_MIN_CHANNEL_PULSE_US;
if (position > PIOS_PPM_OUT_MAX_CHANNEL_PULSE_US)
position = PIOS_PPM_OUT_MAX_CHANNEL_PULSE_US;
// Update the position
ppm_dev->ChannelValue[servo] = position;
}
static void PIOS_PPM_OUT_tim_edge_cb (uint32_t tim_id, uint32_t context, uint8_t chan_idx, uint16_t count)
{
struct pios_ppm_out_dev *ppm_dev = (struct pios_ppm_out_dev *)context;
if (!PIOS_PPM_Out_validate(ppm_dev))
return;
// Finish out the frame if we reached the last channel.
uint32_t pulse_width;
if ((ppm_dev->NumChannelCounter >= PIOS_PPM_OUT_MAX_CHANNELS)) {
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pulse_width = PIOS_PPM_OUT_FRAME_PERIOD_US - ppm_dev->ChannelSum;
ppm_dev->NumChannelCounter = 0;
ppm_dev->ChannelSum = 0;
} else
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ppm_dev->ChannelSum += (pulse_width = ppm_dev->ChannelValue[ppm_dev->NumChannelCounter++]);
// Initiate the pulse
TIM_SetAutoreload(ppm_dev->cfg->channel->timer, pulse_width - 1);
return;
}
#endif /* PIOS_INCLUDE_PPM_OUT */