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main.c
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main.c
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/*
* DSP33F V1
*
* - configuration of the Oscillator (extern)
* - configuration of the ADC module
* - configuration of the SPI module and connection of an LCD
* - configuration of an interruption from Timer 1
* - signal filtering (running average filter)
*
* Microcontroller: DSPIC33FJ32MC204
* Proteus File: DSP_V0.pdsprj
* Author: Samuel CIULLA
*
* Created on June 2021
*/
#include <xc.h>
#include "config.h"
#include "SPI_LCD.h"
#define FCY 10000000 // Fin = 10 MHz
#include <libpic30.h>
/*------------------------------------------------------------------------------
* Global variables
*----------------------------------------------------------------------------*/
int bufX[12]={0}, bufY[12]={0}, steps=0;
/*------------------------------------------------------------------------------
* Prototypes
*----------------------------------------------------------------------------*/
void PLL_config(void);
void PIN_config(void);
void ADC_config(void);
void TIMER_config(void);
void PPS_config(void);
void SPI_config(void);
void LCD_display(void);
void running_average_filter(void);
void init_running_average_filter(void);
/*------------------------------------------------------------------------------
* Interruption
*----------------------------------------------------------------------------*/
void __attribute__((interrupt(auto_psv))) _T1Interrupt(void) {
TMR1 = 0xFF00; // set Timer register
LATCbits.LATC9 = 1; // TICK ON
AD1CON1bits.SAMP = 1; // start sampling
AD1CON1bits.SAMP = 0; // finish sampling
while(!AD1CON1bits.DONE); // conversion done
running_average_filter(); // apply filter
LATCbits.LATC9 = 0; // TICK OFF
_T1IF = 0; // reset T1 flag
}
/*------------------------------------------------------------------------------
* Main program
*----------------------------------------------------------------------------*/
int main(void) {
PPS_config(); // SPI peripheral pins configuration
PLL_config(); // frequency oscillator
PIN_config(); // I/O and analogic pins
ADC_config(); // ADC converter
SPI_config(); // SPI configuration
TIMER_config(); // Timer
Init_Alpha_LCD(); // LCD initialisation
init_running_average_filter(); // read parameters (running average steps)
LCD_display(); // display title and parameters
while (1);
return 0;
}
/*------------------------------------------------------------------------------
* Filter the input signal using running average and output to PORTB (DAC1208)
*----------------------------------------------------------------------------*/
void running_average_filter(void) {
switch (steps) {
case 2:
bufX[0] = ADC1BUF0;
bufY[0] = (bufX[0] + bufX[1]) / steps;
bufX[1] = bufX[0];
LATB = bufY[0];
break;
case 3:
bufX[0] = ADC1BUF0;
bufY[0] = (bufX[0] + bufX[1] + bufX[2]) / steps;
bufX[2] = bufX[1];
bufX[1] = bufX[0];
LATB = bufY[0];
break;
case 4:
bufX[0] = ADC1BUF0;
bufY[0] = (bufX[0] + bufX[1] + bufX[2] + bufX[3]) / steps;
bufX[3] = bufX[2];
bufX[2] = bufX[1];
bufX[1] = bufX[0];
LATB = bufY[0];
break;
case 5:
bufX[0] = ADC1BUF0;
bufY[0] = (bufX[0] + bufX[1] + bufX[2] + bufX[3] + bufX[4]) / steps;
bufX[4] = bufX[3];
bufX[3] = bufX[2];
bufX[2] = bufX[1];
bufX[1] = bufX[0];
LATB = bufY[0];
break;
default:
LATB = 0;
break;
}
}
/*------------------------------------------------------------------------------
* Running average filter initialisation
* Reads parameters from last 4 bits of PORTB
*----------------------------------------------------------------------------*/
void init_running_average_filter(void) {
if ((PORTB >> 12 & 0x000F) == 0) steps = 2;
else if ((PORTB >> 12 & 0x000F) == 1) steps = 3;
else if ((PORTB >> 12 & 0x000F) == 2) steps = 4;
else if ((PORTB >> 12 & 0x000F) == 3) steps = 5;
}
/*------------------------------------------------------------------------------
* ADC configuration
*----------------------------------------------------------------------------*/
void ADC_config(void) {
AD1PCFGL = 0xFFFE; // all digital except AN0
AD1CON1bits.AD12B = 1; // 12 bit operation mode (4096 values)
AD1CON1bits.FORM = 0; // Data output format: Integer
AD1CON1bits.ASAM = 0; // Start when SAMP is set
AD1CON1bits.SSRC = 0; // Conversion start triggered manually
AD1CON2bits.VCFG = 0; // Voltage Vref+=AVDD Vref-=AVSS
AD1CON2bits.CHPS = 0; // Channel select - CH0 only (12 bit mode)
AD1CON3bits.ADRC = 0; // ADC clock source from system clock
AD1CON3bits.ADCS = 2; // TCY · (ADCS<7:0> + 1) = 3 · TCY = TAD
AD1CHS0bits.CH0NA = 0; // Channel 0 negative input is VREF-
AD1CHS0bits.CH0SA = 0; // Channel 0 positive input is AN0
AD1CON1bits.ADON = 1; // enable ADC
}
/*------------------------------------------------------------------------------
* Pins configuration
*----------------------------------------------------------------------------*/
void PIN_config(void) {
TRISB = 0xF000; // PORTB 0-11 OUTPUT and 12-15 INPUT
TRISCbits.TRISC9 = 0; // tick interruption
}
/*------------------------------------------------------------------------------
* PLL configuration
* => Frequency Oscillator = (Fin x (M/(N1*N2))) / 2
*----------------------------------------------------------------------------*/
void PLL_config(void) {
PLLFBDbits.PLLDIV = 0x06; // M=8
CLKDIVbits.PLLPRE = 0; // N1=2
CLKDIVbits.PLLPOST = 0; // N2=2
}
/*------------------------------------------------------------------------------
* Timer configuration
*----------------------------------------------------------------------------*/
void TIMER_config(void) {
T1CON = 0x8000; // Timer 1 ON, pre-scaler 1:1, internal clock
_T1IF = 0; // reset T1 flag
_T1IP = 0x001; // set interrupt priority (lowest)
TMR1 = 0xFF00; // configure Timer register
_T1IE = 1; // enable
}
/*------------------------------------------------------------------------------
* SPI configuration
*----------------------------------------------------------------------------*/
void SPI_config(void) {
IFS0bits.SPI1IF = 0; // reset SPI flag
IEC0bits.SPI1IE = 0; // disable SPI
SPI1CON1 = 0x0000; // clean SPI1 control register
SPI1CON1bits.CKE = 1; // Serial output data on transition from
// active clock state to Idle clock state
SPI1CON1bits.MODE16 = 0; // mode 8 bits
SPI1CON1bits.MSTEN = 1; // master mode
SPI1CON1bits.SPRE = 6; // Secondary pre-scale 2:1
SPI1CON1bits.PPRE = 2; // Primary pre-scale 4:1
SPI1CON2 = 0x0000; // clean SPI1 control 2 register
SPI1STAT = 0x0000; // clean SPI status and control register
SPI1STATbits.SPIEN = 1; // SPI enabled
}
/*------------------------------------------------------------------------------
* Peripheral Pin Selection
*----------------------------------------------------------------------------*/
void PPS_config(void) {
__builtin_write_OSCCONL(OSCCON & ~(1<<6)); // Unlock registers
RPINR20bits.SCK1R = 20; // SPI input pin setup
RPOR10bits.RP21R = 7; // SPI output pin setup
RPOR11bits.RP23R = 8; // SPI SCK pin setup
__builtin_write_OSCCONL(OSCCON | (1<<6)); // Lock registers
}
/*------------------------------------------------------------------------------
* Set display data
*----------------------------------------------------------------------------*/
void LCD_display(void) {
char txt[21];
Send_Cmd_LCD(LCD_CLEAR);
Send_Cmd_LCD(LCD_CUR_OFF);
Send_Txt_LCD("DSPIC33FJ32MC204", 1);
Send_Txt_LCD("Running avg. filter", 2);
switch (steps) {
case 2 ... 5:
sprintf(txt, "Steps: %d", steps);
Send_Txt_LCD(txt, 4);
break;
default:
Send_Txt_LCD("Signal not filtered", 4);
break;
}
}