209 lines
6.4 KiB
C
209 lines
6.4 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : main.c
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* Author : WCH
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* Version : V1.0.0
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* Date : 2021/06/06
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* Description : Main program body.
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*********************************************************************************
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* Attention: This software (modified or not) and binary are used for
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* microcontroller manufactured by Nanjing Qinheng Microelectronics.
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*******************************************************************************/
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/*
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*@Note
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OPA1 is used as a voltage follower output, the external voltage is output to OPA1,
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and the ADC samples OPA1
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OPA1_CHP1 -- PB0
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OPA1_CHN1 -- PA6
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OPA1_OUT_IO_OUT0 -- PA3
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In this example, PA6 and PA3 are short-circuited, and the external voltage is input
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from PB0. If the negative feedback is connected to a resistor, it can also form
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an operational amplifier.
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*/
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#include "debug.h"
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/* Global define */
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/* Global Variable */
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/*********************************************************************
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* @fn OPA1_Init
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*
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* @brief Initializes OPA1 collection.
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*
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* @return none
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*/
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void OPA1_Init( void )
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{
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GPIO_InitTypeDef GPIO_InitStructure = {0};
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OPA_InitTypeDef OPA_InitStructure = {0};
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE );
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init( GPIOB, &GPIO_InitStructure );
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OPA_InitStructure.OPA_NUM = OPA1;
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OPA_InitStructure.PSEL = CHP1;
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OPA_InitStructure.NSEL = CHN1;
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OPA_InitStructure.Mode = OUT_IO_OUT0;
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OPA_Init( &OPA_InitStructure );
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OPA_Cmd( OPA1, ENABLE );
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}
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/*********************************************************************
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* @fn ADC_Channel3_Init
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*
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* @brief Initializes ADC Channel3 collection.
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*
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* @return none
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*/
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void ADC_Channel3_Init( void )
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{
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GPIO_InitTypeDef GPIO_InitStructure = {0};
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ADC_InitTypeDef ADC_InitStructure = {0};
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE );
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1, ENABLE );
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RCC_ADCCLKConfig( RCC_PCLK2_Div8 );
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
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ADC_InitStructure.ADC_ScanConvMode = DISABLE;
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ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
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ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
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ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
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ADC_InitStructure.ADC_NbrOfChannel = 1;
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ADC_Init( ADC1, &ADC_InitStructure );
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ADC_Cmd( ADC1, ENABLE );
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ADC1->CTLR1 |= ( 1 << 26 ); //buffer en
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}
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/*********************************************************************
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* @fn Get_ADC_Val
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*
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* @brief Returns ADCx conversion result data.
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*
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* @param ch - ADC channel.
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* ADC_Channel_0 - ADC Channel0 selected.
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* ADC_Channel_1 - ADC Channel1 selected.
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* ADC_Channel_2 - ADC Channel2 selected.
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* ADC_Channel_3 - ADC Channel3 selected.
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* ADC_Channel_4 - ADC Channel4 selected.
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* ADC_Channel_5 - ADC Channel5 selected.
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* ADC_Channel_6 - ADC Channel6 selected.
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* ADC_Channel_7 - ADC Channel7 selected.
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* ADC_Channel_8 - ADC Channel8 selected.
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* ADC_Channel_9 - ADC Channel9 selected.
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* ADC_Channel_10 - ADC Channel10 selected.
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* ADC_Channel_11 - ADC Channel11 selected.
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* ADC_Channel_12 - ADC Channel12 selected.
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* ADC_Channel_13 - ADC Channel13 selected.
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* ADC_Channel_14 - ADC Channel14 selected.
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* ADC_Channel_15 - ADC Channel15 selected.
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* ADC_Channel_16 - ADC Channel16 selected.
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* ADC_Channel_17 - ADC Channel17 selected.
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*
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* @return none
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*/
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u16 Get_ADC_Val( u8 ch )
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{
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u16 val;
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ADC_RegularChannelConfig( ADC1, ch, 1, ADC_SampleTime_239Cycles5 );
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ADC_SoftwareStartConvCmd( ADC1, ENABLE );
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while( !ADC_GetFlagStatus( ADC1, ADC_FLAG_EOC ) );
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val = ADC_GetConversionValue( ADC1 );
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return val;
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}
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/*********************************************************************
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* @fn Get_ADC_Average
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*
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* @brief Returns ADCx conversion result average data.
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*
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* @param ch - ADC channel.
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* ADC_Channel_0 - ADC Channel0 selected.
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* ADC_Channel_1 - ADC Channel1 selected.
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* ADC_Channel_2 - ADC Channel2 selected.
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* ADC_Channel_3 - ADC Channel3 selected.
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* ADC_Channel_4 - ADC Channel4 selected.
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* ADC_Channel_5 - ADC Channel5 selected.
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* ADC_Channel_6 - ADC Channel6 selected.
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* ADC_Channel_7 - ADC Channel7 selected.
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* ADC_Channel_8 - ADC Channel8 selected.
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* ADC_Channel_9 - ADC Channel9 selected.
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* ADC_Channel_10 - ADC Channel10 selected.
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* ADC_Channel_11 - ADC Channel11 selected.
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* ADC_Channel_12 - ADC Channel12 selected.
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* ADC_Channel_13 - ADC Channel13 selected.
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* ADC_Channel_14 - ADC Channel14 selected.
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* ADC_Channel_15 - ADC Channel15 selected.
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* ADC_Channel_16 - ADC Channel16 selected.
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* ADC_Channel_17 - ADC Channel17 selected.
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*
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* @return val - The Data conversion value.
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*/
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u16 Get_ADC_Average( u8 ch, u8 times )
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{
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u32 temp_val = 0;
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u8 t;
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u16 val;
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for( t = 0; t < times; t++ ){
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temp_val += Get_ADC_Val( ch );
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Delay_Ms( 5 );
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}
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val = temp_val / times;
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return val;
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}
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/*********************************************************************
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* @fn main
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*
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* @brief ADC_Channel0_Init
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*
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* @return none
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*/
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int main( void )
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{
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u16 ADC_val, i;
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Delay_Init();
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USART_Printf_Init( 115200 );
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printf( "SystemClk:%d\r\n", SystemCoreClock );
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printf( "OPA Test\r\n" );
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OPA1_Init();
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ADC_Channel3_Init();
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while( 1 )
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{
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for( i = 0; i < 6; i++ ){
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ADC_val = Get_ADC_Average( ADC_Channel_3, 10 );
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printf( "OPA_OUT:%04d\r\n", ADC_val );
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Delay_Ms( 500 );
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}
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}
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}
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