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LibrePilot/flight/PiOS/STM32F10x/pios_spektrum.c

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/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_SPEKTRUM Spektrum receiver functions
* @brief Code to read Spektrum input
* @{
*
* @file pios_spektrum.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
* Parts by Thorsten Klose (tk@midibox.org) (tk@midibox.org)
* @brief USART commands. Inits USARTs, controls USARTs & Interrupt handlers. (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
*/
/* Project Includes */
#include "pios.h"
#include "pios_spektrum_priv.h"
#if defined(PIOS_INCLUDE_SPEKTRUM)
#if defined(PIOS_INCLUDE_PWM)
#error "Both PWM and SPEKTRUM input defined, choose only one"
#endif
#if defined(PIOS_COM_AUX)
#error "AUX com cannot be used with SPEKTRUM"
#endif
/* Global Variables */
/* Local Variables, use pios_usart */
static uint16_t CaptureValue[12],CaptureValueTemp[12];
static uint8_t prev_byte = 0xFF, sync = 0, bytecount = 0, frame_error=0, byte_array[20] = { 0 };
uint8_t sync_of = 0;
/**
* Initialise the onboard USARTs
*/
void PIOS_SPEKTRUM_Init(void)
{
// TODO: need setting flag for bind on next powerup
if (0) {
PIOS_SPEKTRUM_Bind();
}
NVIC_InitTypeDef NVIC_InitStructure = pios_spektrum_cfg.irq.init;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure = pios_spektrum_cfg.tim_base_init;
/* Enable appropriate clock to timer module */
switch((int32_t) pios_spektrum_cfg.timer) {
case (int32_t)TIM1:
NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
break;
case (int32_t)TIM2:
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
break;
case (int32_t)TIM3:
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
break;
case (int32_t)TIM4:
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
break;
#ifdef STM32F10X_HD
case (int32_t)TIM5:
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
break;
case (int32_t)TIM6:
NVIC_InitStructure.NVIC_IRQChannel = TIM6_IRQn;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
break;
case (int32_t)TIM7:
NVIC_InitStructure.NVIC_IRQChannel = TIM7_IRQn;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM7, ENABLE);
break;
case (int32_t)TIM8:
NVIC_InitStructure.NVIC_IRQChannel = TIM8_CC_IRQn;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
break;
#endif
}
NVIC_Init(&NVIC_InitStructure);
/* Configure timer clocks */
TIM_InternalClockConfig(pios_spektrum_cfg.timer);
TIM_TimeBaseInit(pios_spektrum_cfg.timer, &TIM_TimeBaseStructure);
/* Enable the Capture Compare Interrupt Request */
TIM_ITConfig(pios_spektrum_cfg.timer, pios_spektrum_cfg.ccr, ENABLE);
/* Clear update pending flag */
TIM_ClearFlag(pios_spektrum_cfg.timer, TIM_FLAG_Update);
/* Enable timers */
TIM_Cmd(pios_spektrum_cfg.timer, ENABLE);
}
/**
* Get the value of an input channel
* \param[in] Channel Number of the channel desired
* \output -1 Channel not available
* \output >0 Channel value
*/
int16_t PIOS_SPEKTRUM_Get(int8_t Channel)
{
/* Return error if channel not available */
if (Channel >= 12) {
return -1;
}
return CaptureValue[Channel];
}
/**
* Spektrum bind function
* \output 1 Successful bind
* \output 0 Bind failed
* \note Applications shouldn't call these functions directly
*/
uint8_t PIOS_SPEKTRUM_Bind(void)
{
GPIO_InitTypeDef GPIO_InitStructure = pios_spektrum_cfg.gpio_init;
GPIO_InitStructure.GPIO_Pin = pios_spektrum_cfg.pin;
GPIO_Init(pios_spektrum_cfg.port, &GPIO_InitStructure);
pios_spektrum_cfg.port->BRR = pios_spektrum_cfg.pin;
//PIOS_DELAY_WaitmS(75);
/* RX line, drive high for 10us */
pios_spektrum_cfg.port->BSRR = pios_spektrum_cfg.pin;
PIOS_DELAY_WaituS(10);
/* RX line, drive low for 120us */
pios_spektrum_cfg.port->BRR = pios_spektrum_cfg.pin;
PIOS_DELAY_WaituS(120);
/* RX line, drive high for 120us */
pios_spektrum_cfg.port->BSRR = pios_spektrum_cfg.pin;
PIOS_DELAY_WaituS(120);
/* RX line, drive low for 120us */
pios_spektrum_cfg.port->BRR = pios_spektrum_cfg.pin;
PIOS_DELAY_WaituS(120);
/* RX line, drive high for 120us */
pios_spektrum_cfg.port->BSRR = pios_spektrum_cfg.pin;
PIOS_DELAY_WaituS(120);
/* RX line, drive low for 120us */
pios_spektrum_cfg.port->BRR = pios_spektrum_cfg.pin;
PIOS_DELAY_WaituS(120);
/* RX line, drive high for 120us */
pios_spektrum_cfg.port->BSRR = pios_spektrum_cfg.pin;
PIOS_DELAY_WaituS(120);
/* RX line, drive low for 120us */
pios_spektrum_cfg.port->BRR = pios_spektrum_cfg.pin;
PIOS_DELAY_WaituS(120);
/* RX line, drive high for 120us */
pios_spektrum_cfg.port->BSRR = pios_spektrum_cfg.pin;
PIOS_DELAY_WaituS(120);
/* RX line, set input and wait for data, PIOS_SPEKTRUM_Init */
return 1;
}
/**
* Decodes a byte
* \param[in] b byte which should be spektrum decoded
* \return 0 if no error
* \return -1 if USART not available
* \return -2 if buffer full (retry)
* \note Applications shouldn't call these functions directly
*/
int32_t PIOS_SPEKTRUM_Decode(uint8_t b)
{
static uint16_t channel = 0, sync_word = 0;
uint8_t channeln = 0, frame = 0;
uint16_t data = 0;
byte_array[bytecount] = b;
bytecount++;
if (sync == 0) {
sync_word = (prev_byte << 8) + b;
if(bytecount==1)
{
/* record losscounter into channel8 */
CaptureValueTemp[7]=b;
/* instant write */
CaptureValue[7]=b;
}
if (((sync_word & 0x00FE) == 0) && (bytecount == 2)) {
/* sync low byte always 0x01, high byte seems to be random when switching TX on off on, loss counter??? */
if (sync_word & 0x01) {
sync = 1;
bytecount = 2;
}
}
} else {
if ((bytecount % 2) == 0) {
channel = (prev_byte << 8) + b;
frame = channel >> 15;
channeln = (channel >> 10) & 0x0F;
data = channel & 0x03FF;
if(channeln==0 && data<10) // discard frame if throttle misbehaves
{
frame_error=1;
}
if (channeln < 12 && !frame_error)
CaptureValueTemp[channeln] = data;
}
}
if (bytecount == 16) {
//PIOS_COM_SendBufferNonBlocking(PIOS_COM_TELEM_RF,byte_array,16); //00 2c 58 84 b0 dc ff
bytecount = 0;
sync = 0;
sync_of = 0;
if (!frame_error)
{
for(int i=0;i<12;i++)
{
CaptureValue[i] = CaptureValueTemp[i];
}
}
frame_error=0;
}
prev_byte = b;
return 0;
}
/* Interrupt handler for USART */
void SPEKTRUM_IRQHandler(uint32_t usart_id)
{
/* by always reading DR after SR make sure to clear any error interrupts */
volatile uint16_t sr = pios_spektrum_cfg.pios_usart_spektrum_cfg->regs->SR;
volatile uint8_t b = pios_spektrum_cfg.pios_usart_spektrum_cfg->regs->DR;
/* check if RXNE flag is set */
if (sr & USART_SR_RXNE) {
if (PIOS_SPEKTRUM_Decode(b) < 0) {
/* Here we could add some error handling */
}
}
if (sr & USART_SR_TXE) { // check if TXE flag is set
/* Disable TXE interrupt (TXEIE=0) */
USART_ITConfig(pios_spektrum_cfg.pios_usart_spektrum_cfg->regs, USART_IT_TXE, DISABLE);
}
/* clear "watchdog" timer */
TIM_SetCounter(pios_spektrum_cfg.timer, 0);
}
/**
* This function handles TIM6 global interrupt request.
*/
void PIOS_SPEKTRUM_irq_handler() {
//PIOS_SPEKTRUM_SUPV_IRQ_FUNC {
/* Clear timer interrupt pending bit */
TIM_ClearITPendingBit(pios_spektrum_cfg.timer, TIM_IT_Update);
/* sync between frames, TODO! DX7SE */
sync = 0;
bytecount = 0;
prev_byte = 0xFF;
frame_error=0;
sync_of++;
/* watchdog activated */
if (sync_of > 6) {
/* signal lost */
sync_of = 0;
for (int i = 0; i < 12; i++)
{
CaptureValue[i] = 0;
CaptureValueTemp[i] = 0;
}
}
}
#endif
/**
* @}
* @}
*/