Diff: main.cpp
- Revision:
- 1:2bba0fcfda85
- Parent:
- 0:906202f8e2f2
--- a/main.cpp Thu Apr 16 14:13:01 2015 +0000
+++ b/main.cpp Fri May 08 14:10:09 2015 +0000
@@ -1,147 +1,137 @@
#include "mbed.h"
#include "stdio.h"
-#include "C12832.h"
+#include "math.h"
+#include "PortOut.h"
+//To Do:
+//Fix crc_passed logic
+
+//Improvements:
+//Increase bandwidth by reducing wasted nibbles from CRC
+
+//multicast using 4bit address / 4 bit network. network = 4 msb, address = 4 lsb. broadcast = all 0's. multicast = network id & address of 0's.
#define MAX 100 //set the size of the character data storage array
#define BYTE 8
-#define NIBBLE 4 //used to set size of data read
#define PREAMBLE 0x7E //preamble of 01111110
#define POSTAMBLE 0x81 //postamble of 10000001
-#define ADDRESS 0x11 //address of 00010010 - network of 1, id of 2.
-#define NETWORK 0x10 //network portion of the address
-#define ID 0x02 //id portion of the address
+#define ADDRESS 0x12 //address of 00010010 - network of 1, id of 2.
#define BROADCAST 0x00 //address of 00000000
-//multicast using 4bit address / 4 bit network. network = 4 msb, address = 4 lsb. broadcast = all 0's. multicast = network id & address of 0's.
#define CRC 0x13 //crc of 10011 or x^4+x+1 or crc-5
+Timer t; //timer for pausing after data RXed before displaying data
+DigitalOut myled(LED1); // red led on board
+BusOut db(PTC0,PTC1,PTC2,PTC3,PTC4,PTC5,PTC6,PTC7);//db0,db1,db2,db3,db4,db5,db6,db7
+BusOut lcdc(PTB8,PTB9,PTB10);//rs,rw,e
+int msecs, sksecs; //clock time needed for data transfer and skew time
+DigitalIn clock_pin(PTD7); //clock pulse input and data input pins
+DigitalInOut serial_in(PTD6);//Recieve, send for ACK
-C12832 lcd(p5, p7, p6, p8, p11); //LCD structure
-DigitalOut myled(LED1), myled2(LED2), myled3(LED3), myled4(LED4); //variables to access the four blue leds
-DigitalIn clock_pin(p21), serial_in(p22); //clock pulse input and data input pins
-Timer t; //timer for pausing after postamble received before displaying data
-unsigned char temp, data[MAX], crc_calc; //temp byte storage, storage array, transmitted crc value
-unsigned char preamble, address, i, j, k; //increment variables
-unsigned char data_flag, rflag, d_flag, done, temp_data; //data flags
-int crc_passed = 0; //crc flag
-int temp_crc = 0; //stores values for crc check.
+unsigned char temp, crc_calc; //temp byte storage, storage array, transmitted crc value
+char c[1];//Used for troubleshooting to send a char to LCD
+char data[MAX];//data array
+unsigned char preamble, address, i, j, k, temp_data,FCS; //increment variables
+unsigned char data_flag, rflag, done_flag1, done_flag2; //data flags
+int crc_passed = 0, temp_crc = 0; //CRC Flag, stores values for crc check.
//funtion prototypes
-void check_byte(int value); //stays inside the function until the received byte matches the value passed into the function (PREAMBLE)
-int check_abyte();//after preamble received checks the next byte for address. Returns 1 if address received matches ADDRESS, BROADCAST, or multicast; 0 if not.
-int read_byte(int size); //reads received data and returns it a byte at a time.
-int check_crc(int temp_crc, unsigned char crc_calc); //double checks the sent crc value - data sent without error.
-
-//Improvements
-//if crc correct display correct crc
-//if crc correct send ACK(1) to Master
-//if crc wrong, display incorrect crc
-//if crc wrong, send NoACK(0) to Master
-//if crc wrong adjust for retransmit
-
+void check_byte(int value); //stays inside the function until the RXed byte matches the value passed into the function (PREAMBLE)
+int check_abyte();//after preamble RXed checks the next byte for address. Returns 1 if address RXed matches ADDRESS, BROADCAST, or multicast; 0 if not.
+int read_byte(int size); //reads RXed data and returns it a byte at a time.
+int get_crc(int temp_crc);//Get CRC value on data temp_crc
+void Ms_Delay(int msec);
+void lcdInit(void) ;
+void IC(void) ;
+void lcdClear(void);
+void print(char str[]);
+void send_ACK(int ACK);
int main()
{
-
- //turn off leds
- myled = 0;
- myled2 = 0;
- myled3 = 0;
- myled4 = 0;
-
- //initialize variables
- i = 0;
- d_flag = 0;
- done = 0;
- crc_passed=0;
-
-
- while(!d_flag)
- {
- //clear lcd screen, print current build message
- lcd.cls();
- lcd.locate(0,3);
- lcd.printf("Waiting for Preamble");
- //read input clock pulse and data checking for preamble.
- //preamble while loop
- check_byte(PREAMBLE);
-
- //clear lcd screen, print current build message
- lcd.cls();
- lcd.locate(0,3);
- lcd.printf("Preamble Received");
+ clock_pin.mode(PullUp);//Enable PullUp Resistors
+ serial_in.mode(PullUp);//Enable PullUp Resistors
+ myled=0;//Turn LED On
+ lcdInit();//Initialize LCD
+ //clear lcd screen, print current build message
+ lcdClear();
+ print("Comm Started");
+ Ms_Delay(500);//Wait 500mS
+ while(true) {
+ //initialize variables
+ i = 0;
+ done_flag1 = 0;
+ done_flag2 = 0;
+ crc_passed=0;
- //preamble received check address (next byte), returns to preamble check if not addressed to station
- if(check_abyte())
- d_flag = 1;
- }
-
- while(!done)
- {
- //store data into character array if crc checks.
- data[i] = 0; //initialize current array position to zero
- temp_data = read_byte(BYTE); //store successfully transmitted data
-
- //check for postamble
- if(temp_data == POSTAMBLE)
- {
- //break out of while loop - data finished sending
- done = 1;
+ while(!done_flag1) {
+ //read input clock pulse and data checking for preamble.
+ //preamble while loop
+ check_byte(PREAMBLE);
+ myled=0;//Turn LED On
//clear lcd screen, print current build message
- lcd.cls();
- lcd.locate(0,3);
- lcd.printf("Postamble Received");
- }
-
- //store data in character array if not postamble - check crc when appropriate
- else
- {
- data[i] = temp_data;
- i++; //increment array position
- //store the sent data into temp variable for crc calculation
- temp_crc << 8;
- temp_crc += temp_data;
- //wait until i increments and then check to see if 3 bytes have been received
- if( (i % 3) == 0)
- {
- //check crc
- crc_calc = read_byte(NIBBLE);
- if(check_crc(temp_crc, crc_calc))
- {
- crc_passed=1;
- lcd.cls();
- lcd.locate(0,3);
- lcd.printf("Data passes CRC verification");
- }else{
- lcd.cls();
- lcd.locate(0,3);
- lcd.printf("Data fails CRC verification");
- }
- //zero out crc temp variable
- temp_crc = 0;
+ lcdClear();
+ print("Pre RXed");
+
+ //preamble RXed check address (next byte), returns to preamble check if not addressed to station
+ if(check_abyte())
+ done_flag1 = 1;
+ else {
+ //clear lcd screen, print current build message
+ lcdClear();
+ print("Wait for pre");
}
}
- }
- //pause after displaying postamble received and then display data.
- t.start();
- //wait until the timer has reached the set time.
- while(t.read_ms() < 1000)
- {
-
+
+ while(!done_flag2) {
+ //store data into character array if crc checks.
+ temp_data = read_byte(BYTE); //store successfully transmitted data
+
+ //check for postamble
+ if(temp_data == POSTAMBLE) {
+ //break out of while loop - data finished sending
+ done_flag2 = 1;
+ //clear lcd screen, print current build message
+ lcdClear();
+ print("Post RXed");
+ }
+
+ //store data in character array if not postamble - check crc when appropriate
+ else {
+ //byte1, crc1, byte2, crc2
+ data[i]=0;
+ data[i] = temp_data;
+ temp_crc=temp_data<<4;
+ FCS = read_byte(BYTE); //store successfully transmitted data
+ temp_crc=temp_crc+(FCS & 0x0F);//grab the last 4 bits from crc value byte
+ if(get_crc(temp_crc)==0) {
+ crc_passed=1;
+ lcdClear();
+ print("pass CRC");
+ } else {
+ crc_passed=crc_passed & 0;//needs to be fixed
+ lcdClear();
+ print("fail CRC");
+ }
+ }
+ i++; //increment array position
+ temp_crc = 0;//zero out crc temp variables
+ }
+ //pause after displaying postamble RXed and then display data.
+ //Ms_Delay(1000);//Display Postamble Message
+ if(crc_passed) { //if crc passes display data, send ACK
+ //clear debugging messages - and reset lcd to original position before printing data.
+ //send ACK
+ lcdClear();
+ print("RXed: ");
+ print(data);
+ send_ACK(0x1);
+// for(k=0; k<=i; k++)
+// print("%c", data[k]);
+ } else { //if crc fails, send NOACK
+ send_ACK(0x0);
+ }
+ myled=1;
+ //Ms_Delay(1000);
}
- //stop and reset the timer
- t.stop();
- t.reset();
- if(crc_passed){//if crc passes display data, send ACK
- //clear debugging messages - and reset lcd to original position before printing data.
- //send ACK
- lcd.cls();
- lcd.locate(0,3);
- lcd.printf("Received: ");
- for(k=0; k<=i; k++)
- lcd.printf("%c", data[k]);
- }else{//if crc fails, send NOACK
- //send NoACK
- }
}
void check_byte(int value)
@@ -150,11 +140,9 @@
temp = 0;
rflag=0;
//while loop
- while(!rflag)
- {
+ while(!rflag) {
//read in data if clock is 1 and data flag is 1
- if(clock_pin && data_flag)
- {
+ if(clock_pin && data_flag) {
//data is left shifted into our temporary variable.
//each new data bit is moved into the least significant bit after the rest of the bits are shifted to the left
//data must be sent from the other microcontroller shifted out from the most significant bit to the least significant bit.
@@ -175,11 +163,9 @@
temp = 0;
rflag=0;
//while loop
- while(j<8)
- {
+ while(j<8) {
//read in data if clock is 1 and data flag is 1
- if(clock_pin && data_flag)
- {
+ if(clock_pin && data_flag) {
//data is left shifted into our temporary variable.
//each new data bit is moved into the least significant bit after the rest of the bits are shifted to the left
//data must be sent from the other microcontroller shifted out from the most significant bit to the least significant bit.
@@ -191,28 +177,27 @@
if(!clock_pin && !data_flag)
data_flag = 1;
}
-
+
//clear lcd screen, print current build message
- lcd.cls();
- lcd.locate(0,3);
- if(temp == ADDRESS)
- {
+ lcdClear();
+
+ if(temp == ADDRESS) {
+ rflag = 1;
+ print("Addrss RXed");
+ } else if(temp == BROADCAST) {
rflag = 1;
- lcd.printf("Address Received");
+ print("Brdcst RXed");
+ } else if(((temp & 0xF0) == (ADDRESS & 0xF0)) && ((temp & 0x0F) == 0)) {
+ rflag = 1;
+ print("Multicst1 RXed");
+ } else if(((temp & 0xF0) == 0) && ((temp & 0x0F) == (ADDRESS & 0x0F))) {
+ rflag = 1;
+ print("Multicst2 RXed");
+ //can add if Network==0 and address==x send to x in every network
+ } else {
+ print("Wrng addrss RXed");
}
- else if(temp == BROADCAST)
- {
- rflag = 1;
- lcd.printf("Broadcast received");
- }
- else if(((temp & 0xF0) == NETWORK) && ((temp & 0x0F) == 0))
- {
- rflag = 1;
- lcd.printf("Multicast received");
- }//can add if Network==0 and address==x send to x in every network
- else
- printf("Wrong address received");
-
+ Ms_Delay(1000);
return rflag;
}
@@ -222,15 +207,14 @@
temp = 0;
//read a byte/nibble at a time and return it to main
- while(j<size)
- {
+ while(j<size) {
//read in data if clock is 1 and data flag is 1
if(clock_pin && data_flag) {
//data is left shifted into our temporary variable.
//each new data bit is moved into the least significant bit afater the rest of the bits are shifted to the left
//data must be sent from the other microcontroller shifted out from the most significant bit to the least significant bit.
temp = (temp << 1) + serial_in;
- //increment j (tracks bits received) - turn off data_flag until clock changes.
+ //increment j (tracks bits RXed) - turn off data_flag until clock changes.
j++;
data_flag = 0;
}
@@ -241,17 +225,105 @@
return temp;
}
-int check_crc(int temp_crc, unsigned char crc_calc)
+
+int get_crc(int temp_crc)
+{
+ int j = 11, b = 0, z = 0, Y = 0, C0 = 0, C1 = 0, C2 = 0, C3 = 0;
+ while(j > -1) {
+ b = (temp_crc >> j) % 2;//bit
+ Y = C3 ^ b;
+ C3 = C2;
+ C2 = C1;
+ C1 = Y ^ C0;
+ C0 = Y;
+ j--;
+ }
+ z=z+C3<<1;
+ z=z+C2<<1;
+ z=z+C1<<1;
+ z=z+C0;
+ return z;
+}
+
+void Ms_Delay(int msec)//mS Delay
+{
+ t.start();
+ //wait until the timer has reached the set time.
+ while(t.read_ms() < msec) {
+ }
+ //stop and reset the timer
+ t.stop();
+ t.reset();
+}
+
+void lcdInit()//Initialize LCD
{
- //assume data sent incorrectly, check crc to see if data sent correctly
- int data_correct = 0;
-
- //shift temp 3 bytes by 4 and add transmitted crc
- temp_crc << 4;
- temp_crc += crc_calc;
- //check for crc correctness
- if( (temp_crc % CRC) == 0)
- data_correct = 1;
-
- return data_correct;
+ Ms_Delay(100);
+ db = 0x30;
+ Ms_Delay(2);
+ lcdc = 0x4; //1 Enable
+ Ms_Delay(2);
+ lcdc = 0x0; //Disable
+ Ms_Delay(2);
+ db = 0xF;
+ Ms_Delay(2);
+ lcdc = 0x4; //1 Enable
+ Ms_Delay(2);
+ lcdc = 0x0; //Disable
+ Ms_Delay(2);
+ db = 0x1;
+ Ms_Delay(2);
+ lcdc = 0x4; //1 Enable
+ Ms_Delay(2);
+ lcdc = 0x0; //Disable
+ Ms_Delay(2);
+ db = 0x6;
+ Ms_Delay(2);
+ lcdc = 0x4; //1 Enable
+ Ms_Delay(2);
+ lcdc = 0x0; //Disable
+ Ms_Delay(2);
+}
+
+void IC() //Write to LCD
+{
+ Ms_Delay(2);
+ lcdc = 0x5; //Enable and register select high
+ Ms_Delay(2);
+ lcdc = 0x1; //Disable and register select low
+ Ms_Delay(2);
+}
+
+void lcdClear() //Clear LCD, for LPC, lcd.cls();, lcd.locate(0,3);
+{
+ lcdc = 0x0; //Disable
+ Ms_Delay(2);
+ db = 0x1;
+ Ms_Delay(2);
+ lcdc = 0x4; //1 Enable
+ Ms_Delay(2);
+ lcdc = 0x0; //Disable
+ Ms_Delay(2);
+}
+
+void print(char str[])// print String to LCD Display, for LPC, printf(str);
+{
+ int m=0, stl=strlen(str);
+ while(m<stl) {
+ db = str[m];
+ IC();
+ m++;
+ }
+}
+
+void send_ACK(int ACK)
+{
+ serial_in = ACK;
+ Ms_Delay(1500);///////////////can reduce time when Arduino Postamble delay is reduced
+// if(clock_pin) {
+// //if(!clock_pin && skew_flag && t.read_ms() > sksecs) {//output data before clock high
+// serial_in = (byte / j) % 2;
+// j /= 2; //decrement j to get to next bit location
+// }
+ //reset skew flag
}
\ No newline at end of file
Kyle McKeehan
