/*
* File: ecgcode1.c
* Author: SONY
*
* Created on 4 January, 2015, 12:02 PM
*/
//#include <stdio.h>
//#include <stdlib.h>
#include <xc.h>
#include <sw_spi.h>
// CONFIGURATION BITS ON pg294 of PIC18F4550 datasheet
#pragma config USBDIV = 0; // USB clock source comes directly from the primary oscillator block with no postscale
#pragma config CPUDIV = 00; // Primary oscillator used directly for system clock (no postscaler)
#pragma config PLLDIV = 000;
#pragma config IESO = 0; // Oscillator Switchover mode disabled
#pragma config FCMEN = 0; // Fail-Safe Clock Monitor disabled
#pragma config FOSC = 0b1001; // Internal oscillator, CLKO function on RA6, EC used by USB (INTCKO)
#pragma config VREGEN = 1; // USB voltage regulator enabled
#pragma config BOR = 0; // Brown-out Reset disabled in hardware and software
#pragma config PWRT = 0; // PWRT disabled
#pragma config WDT = 0; // WDT disabled (control is placed on the SWDTEN bit)
#pragma config MCLRE = 1; // MCLR pin enabled, RE3 input pin disabled
#pragma config PBADEN = 0; // PORTB<4:0> pins are configured as digital I/O on Reset
// #pragma config PBADEN = 1; PORTB<4:0> pins are configured as analog input channels on Reset
#pragma config CCP2MX = 1; // 1 = CCP2 input/output is multiplexed with RC1; 0 = CCP2 input/output is multiplexed with RB3
#pragma config CONFIG4L = 0b11000000; // background debugger disabled, Dedicated ICPORT enabled, LVP disabled, stack overflow will not cause RESET,
#pragma config CONFIG5L = 0b00001111; // No code protection
#pragma config CONFIG5H = 0b11000000; // No code protection
#pragma config CONFIG6L = 0b00001111; // No write protection
#pragma config CONFIG6H = 0b11100000; // No write protection
#pragma config CONFIG7L = 0b00001111; // Not protected from table reads executed in other blocks
#pragma config CONFIG7H = 0b01000000; // Not protected from table reads executed in other blocks
//#pragma config OSCCON = 0b01111111; // 8MHz Internal Clock
/*
#pragma config FOSC = INTOSCIO_EC
#pragma config FCMEN = OFF // OR this way
#pragma config BORV = 3
#pragma config WDT = OFF
#pragma config CPB = OFF
#pragma config CPD = OFF //- See more at: http://www.rakeshmondal.info/pic18f4550-tutorial-blinking-led#sthash.x41V8uJZ.dpuf
*/
#define _XTAL_FREQ 20000000
// Device Setting Read Only
// Global Setting across channels
#define CONFIG1 0x01h
#define CONFIG2 0x02h
#define CONFIG3 0x03h
#define LOFF 0x04h
// Channel specific settings
#define CH1SET 0x05h
#define CH2SET 0x06h
#define CH3SET 0x07h
#define CH4SET 0x08h
#define CH5SET 0x09h
#define CH6SET 0x0Ah
#define CH7SET 0x0Bh
#define CH8SET 0x0Ch
#define RLD_SENSP 0x0Dh
#define RLD_SENSN 0x0Eh
#define LOFF_SENSP 0x0Fh
#define LOFF_SENSN 0x10h
#define LOFF_FLIP 0x11h
//Lead Off Status Registers (Read Only)
#define LOFF_STATP 0x12h
#define LOFF_STATN 0x13h
//GPIO and other registers
#define GPIO 0x14h
#define PACE 0x15h
#define RESP 0x16h
#define CONFIG4 0x17h
#define WCT1 0x18h
#define WCT2 0x19h
#define DevID 0b10010010
// opcode commands
#define WAKEUP 0x02h
#define STANDBY 0x04h
#define RESETr 0x06h
#define START 0x08h
#define STOP 0x0Ah
#define RDATAC 0x10h
#define SDATAC 0x11h
#define RDATA 0x12h
void delay_millisec(unsigned int X);
void SPI_Write(unsigned char addr,unsigned char data);
unsigned char SPI_Read(unsigned char addr);
void OPCODE_Write(unsigned char* code);
int main(void) {
OSCCON = 0b01111111;
TRISD = 0x00; // port D configured as output
LATD = 0x00; // all outputs set to 0;
unsigned char ID = 0;
SMP = 0b1; // Input data sampled at end of data output time
CKE = 0b1; // Transmit occurs on transition from active to Idle clock state
SSPEN = 0b1; // Enables serial port and configures SCK, SDO, SDI and SS as serial port pins
CKP = 0b0; // Idle state for clock is a low level
SSPM3 = 0b0; // SPI Master mode, clock = FOSC/4 USE FOSC = 8MHz
SSPM2 = 0b0;
SSPM1 = 0b0;
SSPM0 = 0b0;
delay_millisec(820);
OPCODE_Write("RESETr");
__delay_us(9);
OPCODE_Write("SDATAC");
__delay_us(2);
SPI_Write("CONFIG3", 0xC0);
SPI_Write("CONFIG1", 0x86);
SPI_Write("CONFIG2", 0x00);
SPI_Write("CH1SET", 0x01);
SPI_Write("CH2SET", 0x01);
SPI_Write("CH3SET", 0x01);
SPI_Write("CH4SET", 0x01);
SPI_Write("CH5SET", 0x01);
SPI_Write("CH6SET", 0x01);
SPI_Write("CH7SET", 0x01);
SPI_Write("CH8SET", 0x01);
ID = SPI_Read(0x00);
//LATD = ID;
while (1)
{
//ID = SPI_Read(0x00);
LATD = ID;
}
// return (EXIT_SUCCESS);
}
void delay_millisec(unsigned int X)
{
do
{
X--;
__delay_ms(1);
}
while(X > 0);
}
void SPI_Write(unsigned char addr,unsigned char data)
{
// Activate the SS SPI Select pin
LATAbits.LATA5 = 0;
// Send the address of the register to be accessed
SSPBUF = (0x40|addr);
// Wait for Data Transmit/Receipt complete
while(!SSPSTATbits.BF);
// Delay of 4 tCLKs after every transfer. Refer pg40 of ads1298 datasheet
__delay_us(2);
// One register at a time
SSPBUF = 0x00;
// Wait for Data Transmit/Receipt complete
while(!SSPSTATbits.BF);
// Delay of 4 tCLKs after every transfer. Refer pg40 of ads1298 datasheet
__delay_us(2);
// Write data
SSPBUF = data;
// Wait for Data Transmit/Receipt complete
while(!SSPSTATbits.BF);
// Delay of 4 tCLKs after every transfer. Refer pg40 of ads1298 datasheet
__delay_us(2);
// CS pin is not active
LATAbits.LATA5 = 1;
}
unsigned char SPI_Read(unsigned char addr)
{
// Activate the SS SPI Select pin
LATAbits.LATA5 = 0;
//NOP;
// Send address of the register to be accessed
SSPBUF = (0x20|addr);
// Wait for Data Transmit/Receipt complete
while(!SSPSTATbits.BF);
// Delay of 4 tCLKs after every transfer. Refer pg40 of ads1298 datasheet
__delay_us(2);
// One register at a time
SSPBUF = 0x00;
// Wait for Data Transmit/Receipt complete
while(!SSPSTATbits.BF);
// Delay of 4 tCLKs after every transfer. Refer pg40 of ads1298 datasheet
__delay_us(2);
// Send dummy variable
SSPBUF = 0x00;
// Delay of 8 tCLKs after every transfer
__delay_us(4);
// Wait for Data Transmit/Receipt complete
while(!SSPSTATbits.BF);
// Delay of 4 tCLKs after every transfer. Refer pg40 of ads1298 datasheet
__delay_us(2);
// Delay of 4 tCLKs before CS goes high. Refer pg15 of ads1298 datasheet
__delay_us(2);
// CS pin is not active
LATAbits.LATA5 = 1;
//NOP;
return(SSPBUF);
}
void OPCODE_Write(unsigned char* code)
{
// Activate the SS SPI Select pin
LATAbits.LATA5 = 0;
//NOP;
// Send the OPCODE
SSPBUF = code;
// Wait for Data Transmit/Receipt complete
while(!SSPSTATbits.BF);
// Delay of 4 tCLKs after every transfer. Refer pg40 of ads1298 datasheet
__delay_us(2);
// Delay of 4 tCLKs before CS goes high. Refer pg15 of ads1298 datasheet
__delay_us(2);
// CS pin is not active
LATAbits.LATA5 = 1;
//NOP;
}