54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*
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Copyright 2017 fishpepper <AT> gmail.com
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http:// www.gnu.org/licenses/>.
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author: fishpepper <AT> gmail.com
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*/
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#ifndef HAL_PPM_H_
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#define HAL_PPM_H_
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#include "config.h"
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#include "stm32f10x_tim.h"
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void hal_ppm_init(void);
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void hal_ppm_failsafe_exit(void);
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void hal_ppm_failsafe_enter(void);
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static void hal_ppm_init_rcc(void);
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static void hal_ppm_init_gpio(void);
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static void hal_ppm_init_timer(void);
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static void hal_ppm_init_nvic(void);
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static void hal_ppm_init_ocx(uint8_t ch, TIM_TypeDef *TIMx, TIM_OCInitTypeDef *tim_oc_init);
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// counter runs with 2MHz = 0.5us resolution
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#define HAL_PPM_US_TO_TICKCOUNT(us) ((us * 2)-1)
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// from frsky to ticks coresponding to 1000...2000 us
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// frsky seems to send us*1.5 (~1480...3020)
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// -> divide by 1.5 (=*2/3) to get us -> multiply by 2 to get us
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#define HAL_PPM_FRSKY_TO_TICKCOUNT(_frsky) ((_frsky)*2*2/3)
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#define PPM_TIMER_ISR(void) PPM_TIMER_IRQHANDLER(void)
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#define HAL_PPM_UPDATE_CCVALUE(x) { PPM_TIMER->ARR = x; }
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#define HAL_PPM_ISR_DISABLE() { __disable_irq(); }
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#define HAL_PPM_ISR_ENABLE() { __enable_irq(); }
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#define HAL_PPM_ISR_FLAG_SET() (TIM_GetITStatus(PPM_TIMER, TIM_IT_Update) != RESET)
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#define HAL_PPM_ISR_CLEAR_FLAG() { TIM_ClearITPendingBit(PPM_TIMER, TIM_IT_Update); }
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#endif // HAL_PPM_H_
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