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/* H7 -projekt opgave */ |
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///////////////////////////////////////////////////////////////////////
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//Includes |
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#include <pic18.h>
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#include <string.h>
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#include "delay.h" |
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#include "i2c.h"
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#include "lcd.h" |
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/////////////////////////////////////////////////////////////////////
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//Defines
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#define TC74 0x9A /* I2C TC74 IC */
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#define SLIP_END 192
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#define SLIP_ESC 219
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#define SLIP_ESCAPED_END 220
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#define SLIP_ESCAPED_ESC 221
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#define BUFFERLEN 16
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//////////////////////////////////////////////////////////////////
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// Enumerations
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enum SlipState{
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SlipNormal,
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SlipEscaped,
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SlipError,
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SlipStopped
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};
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enum BaudRates{
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Baud1200,
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Baud2400,
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Baud4800,
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Baud9600,
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Baud19200
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};
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enum Commands{
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CmdRead,
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CmdWrite,
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CmdAck,
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CmdNAck
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};
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enum Targets {
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TLed3, //0
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TLed4,
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TLed5,
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TSwitch2,
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TSwitch3,
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TPotmeter,
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TTemp,
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TBaud = 10
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};
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//////////////////////////////////////////////////////////////////
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//Globale data
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// Alle globale variabler bruger "global_" som prefix
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unsigned char global_comm_buffer[BUFFERLEN];
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unsigned char global_comm_length;
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unsigned char global_comm_index;
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bit global_comm_ready;
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bit global_comm_error;
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unsigned char global_comm_slipstate;
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unsigned char global_comm_currentrate;
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unsigned char global_lcd_buffer[20];
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unsigned char global_lcd_index;
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bit global_led_0;
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bit global_led_1;
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bit global_led_2;
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bit global_reset_baudrate;
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char global_temp;
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unsigned char global_potmeter_hi;
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unsigned char global_potmeter_lo;
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///////////////////////////////////////////////////////////////////
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// Interrupt funktioner
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void recieve_interrupt(void)
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{
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unsigned char data = RCREG;
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RB2 = !RB2;
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switch (global_comm_slipstate)
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{
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case SlipNormal:
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if (data == SLIP_END)
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{
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global_comm_ready = 1;
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global_comm_slipstate = SlipStopped;
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}
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else if (data == SLIP_ESC)
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{
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global_comm_slipstate = SlipEscaped;
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}
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else
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global_comm_buffer[ global_comm_length++ ] = data;
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break;
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case SlipEscaped:
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if (data == SLIP_ESCAPED_ESC)
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{
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global_comm_buffer[ global_comm_length++ ] = SLIP_ESC;
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global_comm_slipstate = SlipNormal;
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}
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else if (data ==SLIP_ESCAPED_END)
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{
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global_comm_buffer[ global_comm_length++ ] = SLIP_END;
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global_comm_slipstate = SlipNormal;
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}
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else
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{
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global_comm_slipstate = SlipError;
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}
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case SlipError:
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if (data == SLIP_END)
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{
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global_comm_error = 1;
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global_comm_slipstate = SlipStopped;
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global_comm_ready = 1;
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}
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case SlipStopped: //vi var ikke klar til at modtage data
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global_comm_error = 1;
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}
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}
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/*
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void transmit_interrupt(void)
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{
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RB2 = !RB2;
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}
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*/
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void interrupt interrupt_handler(void)
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{
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if (RCIF == 1)
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{
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recieve_interrupt();
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RCIF = 0;
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}
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/*if (TXIF == 1)
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{
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transmit_interrupt();
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TXIF = 0;
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}
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*/
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}
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///////////////////////////////////////////////////////////////////
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// Slip funktioner
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void slip_reset(void)
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{
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global_comm_error = 0;
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global_comm_slipstate = SlipNormal;
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global_comm_ready = 0;
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global_comm_length = 0;
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memset(global_comm_buffer, 0, BUFFERLEN);
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}
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void slip_highlevel_protocol(void)
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{
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unsigned char cmd,target,data;
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cmd = global_comm_buffer[0] & 0x0F;
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target = ( global_comm_buffer[0] >> 4 ) & 0x0F;
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data = global_comm_buffer[1];
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if (cmd == CmdRead || cmd == CmdWrite)
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{
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//sæt standart længde - da længden kun varierer ved læsning af potmeter
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if (cmd == CmdRead)
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global_comm_length = 2;
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else
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global_comm_length = 1;
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switch(target)
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{
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case TLed3:
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if (cmd == CmdRead)
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global_comm_buffer[1] = global_led_0;
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else
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global_led_0 = data;
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break;
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case TLed4:
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if(cmd == CmdRead)
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global_comm_buffer[1] = global_led_1;
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else
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global_led_1 = data;
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break;
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case TLed5:
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if (cmd == CmdRead)
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global_comm_buffer[1] = global_led_2;
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else
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global_led_2 = data;
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break;
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case TSwitch2:
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if (cmd == CmdRead)
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global_comm_buffer[1] = RA4;
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else
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global_comm_error = 1;
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break;
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case TSwitch3:
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if (cmd == CmdRead)
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global_comm_buffer[1] = RB0;
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else
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global_comm_error = 1;
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break;
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case TPotmeter:
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if (cmd == CmdRead)
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{
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global_comm_buffer[1] = global_potmeter_hi;
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global_comm_buffer[2] = global_potmeter_lo;
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global_comm_length = 3;
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}
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else
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global_comm_error = 1;
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break;
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case TTemp:
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if (cmd == CmdRead)
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global_comm_buffer[1] = global_temp;
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else
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global_comm_error = 1;
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break;
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case TBaud:
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if (cmd == CmdRead)
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global_comm_error = 1;
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else
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{
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//we can only handle 1200,2400,9600,19200
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if (data == 0 || data == 1 || data == 3 || data == 4)
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global_reset_baudrate = 1;
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else
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global_comm_error = 1;
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}
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break;
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default:
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global_comm_error = 1;
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}
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}
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else //kommandoen var noget andet end read/write
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{
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global_comm_error = 1;
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}
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if (global_comm_error == 1) //we saw an error
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{
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global_comm_buffer[0] = CmdNAck | target<<4;
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global_comm_length = 1;
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}
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else
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{
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global_comm_buffer[0] = CmdAck | target<<4; //skriv acknowledge feltet
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}
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}
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void slip_send_byte(char data)
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{
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TXREG = data;
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while (TRMT==0) ;
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DelayUs(20);
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}
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void slip_send_response(void)
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{
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int i;
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for (i=0; i< global_comm_length;i++)
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{
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if ( global_comm_buffer[i] == SLIP_ESC)
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{
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slip_send_byte(SLIP_ESC);
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slip_send_byte(SLIP_ESCAPED_ESC);
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}
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else if (global_comm_buffer[i] == SLIP_END)
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{
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slip_send_byte(SLIP_ESC);
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slip_send_byte(SLIP_ESCAPED_END);
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}
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else
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{
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slip_send_byte( global_comm_buffer[i]);
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}
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}
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slip_send_byte(SLIP_END);
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}
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///////////////////////////////////////////////////////////////////
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// Gennerelle funktioner
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void interrupt_init(void)
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{
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TXIE = 0; //Disable AUX TX interrupt - testes med TXIF;
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RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF;
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IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet
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PEIE = 1; // PEIE = PEriphal Interrupt Enable
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TXIF = 0; //nulstil intterupt flag
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RCIF = 0;
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GIE = 1; //Global interrupt enable bit
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}
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void serial_init(void)
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{
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SPEN = 0; //Make sure serial port is disabled
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// snupset fra Kim H Pedersens serialmain.c
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// Set Port C bit 6 output (TxD) and bit 7 input (RxD)
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TRISC6 = 0;
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TRISC7 = 1;
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SPBRG = 25; // x = Fosc/(16 * Baud Rate) - 1
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// x = 4000000/(16 * 9600) - 1
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// x = 25.0417 ~ 25
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// Baud Rate = Fosc/(16 * (x+1))
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// Baud Rate = 4000000/(16 * (25+1))
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// Baud Rate = 9615
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TXSTA = 0x24; // TXSTA7 = 0 Don't care in asynchronous
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// TXSTA6 = 0 8-bit transmission
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// TXSTA5 = 1 Transmit enabled
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// TXSTA4 = 0 Asynchronous mode
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// TXSTA3 = 0 Unimplemented
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// TXSTA2 = 1 High speed
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// TXSTA1 = 0 TSR empty
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// TXSTA0 = 0 9th bit */
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RCSTA = 0x90; // RCSTA7 = 0 Serial port disabled
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// RCSTA6 = 0 8-bit reception
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// RCSTA5 = 0 Don't care in asynchronous
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// RCSTA4 = 1 Receiver enabled
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// RCSTA3 = 0 Don't care (8-bit operation)
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// RCSTA2 = 0 No framing error
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// RCSTA1 = 0 Overrun error bit
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// RCSTA0 = 0 9th bit */
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//config completed
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SPEN = 1; //Enable Serial port
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}
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/* basic I/O ports */
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void io_init(void)
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{
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TRISB3 = 0; //LED ports = output
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TRISB2 = 0;
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TRISB1 = 0;
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TRISB0 = 1; //Switch porte = input
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TRISA0 = 1;
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}
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void ad_init(void)
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{
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// AD Conversion clock
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ADCS0 = 0;
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ADCS1 = 0;
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ADCS2 = 0;
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//Select AN0/RA0 for AD source
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CHS0=0;
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CHS1=0;
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CHS2=0;
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//Only AN0 is selected for AD and with Vdd/Vss as limits
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PCFG0=0;
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PCFG1=1;
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PCFG2=1;
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PCFG3=1;
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//Result is right justified
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ADFM=1;
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//Fire up for A/D converter module
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ADON=1;
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}
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void i2c_init(void)
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{
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// I2C_MODULE hører hjemme i i2c.h
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#ifdef I2C_MODULE |
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SSPMode(MASTER_MODE); |
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SSPEN = 1; |
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CKP = 1; |
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#else |
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SCL_DIR = I2C_OUTPUT; |
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SDA_DIR = I2C_OUTPUT; |
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SDA = 0; |
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SCL = 0; |
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#endif
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}
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char ReadTemp(void)
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{
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char temp;
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i2c_WriteTo(TC74); //write to, will automatically send a start condition
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i2c_PutByte(0x00); //tell TC74 we want to read
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i2c_ReadFrom(TC74);
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temp = i2c_GetByte(I2C_LAST);
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i2c_Stop(); //assert a stop condition on SDA & SCL
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return temp;
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}
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///////////////////////////////////////////////////////////////////
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//Main
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void main(void)
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{
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char lcdbuf[20];
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int i;
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lcd_init(0); //init in 4-bit mode
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i2c_init();
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serial_init(); //9600 8N1
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ad_init();
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io_init();
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interrupt_init();
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slip_reset(); //take SLIP FSM into normal state
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global_comm_currentrate = Baud9600; //default baudrate = 9600
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global_reset_baudrate = 0;
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// initialisation completed and we are ready to recieve commands - enable serial reception
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CREN = 1;
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while (1)
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{
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if (global_comm_ready == 1)
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{
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slip_highlevel_protocol(); //parse the slip frame recieved & generate response
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slip_send_response();
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slip_reset();
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}
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if ( global_reset_baudrate == 1)
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{
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}
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RB1 = global_led_0;
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RB2 = global_led_1;
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RB3 = global_led_2;
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global_temp = ReadTemp();
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//potmeter
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if (GODONE ==0 )//hvis A/D-conv er færdig
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{
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global_potmeter_hi = ADRESH;//gem AD resultat
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global_potmeter_lo = ADRESL;
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GODONE = 1; //start ny konverering
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}
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|
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//just for fun - blink RB3
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// RB3 = !RB3;
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// DelayMs(250);
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} |
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} |