kopia lustrzana https://github.com/gcallipo/RadioDSP-Stm32f103
211 wiersze
6.1 KiB
C
211 wiersze
6.1 KiB
C
/**
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******************************************************************************
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* @file main.c
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* @author Giuseppe Callipo - IK8YFW - ik8yfw@libero.it
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* @version V1.0.0
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* @date 22-04-2018
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* @brief IO Routine
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*
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*
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* NOTE: This file is part of RadioDSP project.
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* See main.c file for additional project informations.
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******************************************************************************/
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#include "io_routines.h"
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/********************************************************************
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*
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* DAC PWM SETUP - SAMPLE FREQ. 35.15kHz
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*
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********************************************************************/
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void PWM_Setup()
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{
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TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
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NVIC_InitTypeDef NVIC_InitStruct;
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TIM_OCInitTypeDef TIM_OCInitStruct;
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GPIO_InitTypeDef GPIO_InitStruct;
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// Step 1: Initialize TIM2 for PWM
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
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// Timer freq = timer_clock / ((TIM_Prescaler+1) * (TIM_Period+1))
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// Timer freq = 72MHz / ((1+1) * (1023+1) = 35.15kHz
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TIM_TimeBaseInitStruct.TIM_Prescaler = 1;
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TIM_TimeBaseInitStruct.TIM_Period = 1023;
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TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
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TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
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TIM_Cmd(TIM2, ENABLE);
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// Step 2: Initialize PWM
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TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
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TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
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TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
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TIM_OCInitStruct.TIM_Pulse = 0;
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TIM_OC1Init(TIM2, &TIM_OCInitStruct);
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TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
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// Step 3: Initialize TIM3 for timer interrupt
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
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// Timer freq = timer_clock / ((TIM_Prescaler+1) * (TIM_Period+1))
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// Timer freq = 72MHz / ((1+1) * (1023+1) = 35.15kHz
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TIM_TimeBaseInitStruct.TIM_Prescaler = 1;
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TIM_TimeBaseInitStruct.TIM_Period = 1023;
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TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
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TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);
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// Enable TIM3 interrupt
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TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
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TIM_Cmd(TIM3, ENABLE);
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// Step 4: Initialize NVIC for timer interrupt
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NVIC_InitStruct.NVIC_IRQChannel = TIM3_IRQn;
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NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00;
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NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00;
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NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStruct);
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// Step 5: Initialize GPIOA (PA0) for PWM output
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_Init(GPIOA, &GPIO_InitStruct);
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}
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void PWM_Write(uint16_t val)
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{
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// Write PWM value
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TIM2->CCR1 = val;
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}
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/********************************************************************
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*
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* ADC SETUP
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*
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********************************************************************/
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void ADC_Setup()
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{
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ADC_InitTypeDef ADC_InitStruct;
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GPIO_InitTypeDef GPIO_InitStruct;
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// Step 1: Initialize ADC1
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
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ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
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ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
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ADC_InitStruct.ADC_ExternalTrigConv = DISABLE;
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ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
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ADC_InitStruct.ADC_Mode = ADC_Mode_Independent;
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ADC_InitStruct.ADC_NbrOfChannel = 1;
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ADC_InitStruct.ADC_ScanConvMode = DISABLE;
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ADC_Init(ADC1, &ADC_InitStruct);
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ADC_Cmd(ADC1, ENABLE);
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// ADC1 channel 1 (PA1)
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ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_7Cycles5);
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// Step 2: Initialize GPIOA (PA1) for analog input
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AIN;
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GPIO_Init(GPIOA, &GPIO_InitStruct);
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}
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uint16_t ADC_Read()
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{
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// Start ADC conversion
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ADC_SoftwareStartConvCmd(ADC1, ENABLE);
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// Wait until ADC conversion finished
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while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
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return ADC_GetConversionValue(ADC1);
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}
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/********************************************************************
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*
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* IO BUTTON AND LED SETUP
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*
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********************************************************************/
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void GPIO_Setup()
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{
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GPIO_InitTypeDef GPIO_InitStruct;
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// Initialize GPIOC (PC13) for LED
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13;
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_Init(GPIOC, &GPIO_InitStruct);
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// Initialize GPIOB (PB12, PB13, PB14, PB15) for switch
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 |
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GPIO_Pin_14 | GPIO_Pin_15;
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_Init(GPIOB, &GPIO_InitStruct);
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}
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/********************************************************************
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*
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* TIMER ROUTINES IMPLEMENTATION
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*
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********************************************************************/
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// For store tick counts in us
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static __IO uint32_t usTicks;
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// SysTick_Handler function will be called every 1 us
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void SysTick_Handler()
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{
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if (usTicks != 0)
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{
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usTicks--;
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}
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}
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void DelayInit()
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{
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// Update SystemCoreClock value
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SystemCoreClockUpdate();
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// Configure the SysTick timer to overflow every 1 us
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SysTick_Config(SystemCoreClock / 1000000);
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}
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void DelayUs(uint32_t us)
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{
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// Reload us value
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usTicks = us;
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// Wait until usTick reach zero
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while (usTicks);
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}
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void DelayMs(uint32_t ms)
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{
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// Wait until ms reach zero
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while (ms--)
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{
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// Delay 1ms
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DelayUs(1000);
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}
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}
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/********************************************************************
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*
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* INPUT OUTPUT CONVERTER
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*
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* The routines convert the integer format acquired to float alternate
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* values used in real time filtering and vice versa.
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*
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*
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********************************************************************/
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float32_t inputConvert(uint16_t input){
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return (((float32_t)input*3.2)/1024) - 1.6;
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}
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uint16_t outputConvert(float32_t input){
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return((input + 1.6) *1024)/3.2;
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}
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