71 lines
2 KiB
C
71 lines
2 KiB
C
#include "RFInput.h"
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#include "stm32f1xx_ll_gpio.h"
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#include "stm32f1xx_ll_bus.h"
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#include "stm32f1xx_ll_tim.h"
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// timer 4 channel 1 for pb6 channel 2 for pb7
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void RF_INPUT_Init(void)
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{
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// GPIO setup
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LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOB);
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LL_GPIO_InitTypeDef pb6_init_conf, pb7_init_conf;
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pb6_init_conf.Mode = LL_GPIO_MODE_FLOATING;
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pb6_init_conf.Pin = LL_GPIO_PIN_6;
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pb6_init_conf.Pull = LL_GPIO_PULL_DOWN;
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LL_GPIO_Init(GPIOB, &pb6_init_conf);
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pb7_init_conf.Mode = LL_GPIO_MODE_FLOATING;
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pb7_init_conf.Pin = LL_GPIO_PIN_7;
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pb7_init_conf.Pull = LL_GPIO_PULL_DOWN;
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LL_GPIO_Init(GPIOB, &pb7_init_conf);
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// timer setup to
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LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM4);
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LL_TIM_InitTypeDef tim4_init_struct;
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tim4_init_struct.Autoreload= 0xFFFF; // ??
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tim4_init_struct.Prescaler=71;
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tim4_init_struct.ClockDivision=LL_TIM_CLOCKDIVISION_DIV1;
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tim4_init_struct.CounterMode=LL_TIM_COUNTERMODE_UP;
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tim4_init_struct.RepetitionCounter=0;
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LL_TIM_Init(TIM4, &tim4_init_struct);
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// setup channel 1 to capture period of pwm
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LL_TIM_IC_InitTypeDef tim4_ic_conf;
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tim4_ic_conf.ICPolarity= LL_TIM_IC_POLARITY_RISING;
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tim4_ic_conf.ICActiveInput = LL_TIM_ACTIVEINPUT_DIRECTTI;
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tim4_ic_conf.ICFilter = LL_TIM_IC_FILTER_FDIV1;
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tim4_ic_conf.ICPrescaler = LL_TIM_ICPSC_DIV1;
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LL_TIM_IC_Init(TIM4, LL_TIM_CHANNEL_CH1, &tim4_ic_conf);
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// setup channel 2 to capture duty time of pwm
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LL_TIM_IC_InitTypeDef tim4_ic_conf_2;
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tim4_ic_conf_2.ICPolarity= LL_TIM_IC_POLARITY_FALLING;
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tim4_ic_conf_2.ICActiveInput = LL_TIM_ACTIVEINPUT_INDIRECTTI;
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tim4_ic_conf_2.ICFilter = LL_TIM_IC_FILTER_FDIV1;
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tim4_ic_conf_2.ICPrescaler = LL_TIM_ICPSC_DIV1;
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LL_TIM_IC_Init(TIM4, LL_TIM_CHANNEL_CH2, &tim4_ic_conf_2);
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// setup reset of clock at rising edge
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LL_TIM_SetSlaveMode(TIM4, LL_TIM_SLAVEMODE_RESET);
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LL_TIM_SetTriggerInput(TIM4, LL_TIM_TS_TI1FP1);
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LL_TIM_EnableCounter(TIM4);
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}
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int RF_INPUT_GetValue1(void)
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{
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return LL_TIM_ReadReg(TIM4, CCR1);
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}
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int RF_INPUT_GetValue2(void)
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{
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return LL_TIM_ReadReg(TIM4, CCR2);
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}
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