sakthi priya amirtharaj / Mbed 2 deprecated CDMS_tc

master sending tc

Dependencies:   mbed-rtos mbed

main.cpp@0:252ce694a71e, 2014-12-17 (annotated)

Committer:
sakthipriya
Date:
Wed Dec 17 12:49:58 2014 +0000
Revision:
0:252ce694a71e
master sending tc

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sakthipriya 0:252ce694a71e 1 #include "mbed.h"
sakthipriya 0:252ce694a71e 2 #include "rtos.h"
sakthipriya 0:252ce694a71e 3
sakthipriya 0:252ce694a71e 4 const int addr = 0x20; //slave address
sakthipriya 0:252ce694a71e 5 I2C master (D14,D15); //configure pins p27,p28 as I2C master
sakthipriya 0:252ce694a71e 6 Serial pc (USBTX,USBRX);
sakthipriya 0:252ce694a71e 7 DigitalOut interrupt(D9);
sakthipriya 0:252ce694a71e 8 InterruptIn data_ready(D10);
sakthipriya 0:252ce694a71e 9
sakthipriya 0:252ce694a71e 10 int reset;
sakthipriya 0:252ce694a71e 11
sakthipriya 0:252ce694a71e 12 typedef struct
sakthipriya 0:252ce694a71e 13 {
sakthipriya 0:252ce694a71e 14 char data; // To avoid dynamic memory allocation
sakthipriya 0:252ce694a71e 15 int length;
sakthipriya 0:252ce694a71e 16 }i2c_data;
sakthipriya 0:252ce694a71e 17
sakthipriya 0:252ce694a71e 18 //Mail<i2c_data,16> i2c_data_receive;
sakthipriya 0:252ce694a71e 19 Mail<i2c_data,16> i2c_data_send;
sakthipriya 0:252ce694a71e 20
sakthipriya 0:252ce694a71e 21 Thread * ptr_t_i2c;
sakthipriya 0:252ce694a71e 22 void FUNC_I2C_MASTER_FSLAVE(char * data,int length)
sakthipriya 0:252ce694a71e 23 {
sakthipriya 0:252ce694a71e 24 //printf("press backspace for master to start \n\r");
sakthipriya 0:252ce694a71e 25 //while(1){
sakthipriya 0:252ce694a71e 26 //interrupt = 0;
sakthipriya 0:252ce694a71e 27 // if(pc.getc()=='z'){
sakthipriya 0:252ce694a71e 28 wait(0.5);
sakthipriya 0:252ce694a71e 29 interrupt = 1;
sakthipriya 0:252ce694a71e 30 printf("\nMaster executed\n");
sakthipriya 0:252ce694a71e 31
sakthipriya 0:252ce694a71e 32
sakthipriya 0:252ce694a71e 33 bool ack0 =true;
sakthipriya 0:252ce694a71e 34 bool loopvariable0 =true;
sakthipriya 0:252ce694a71e 35 //char *data = new char;
sakthipriya 0:252ce694a71e 36 //*data = 'b';
sakthipriya 0:252ce694a71e 37
sakthipriya 0:252ce694a71e 38
sakthipriya 0:252ce694a71e 39
sakthipriya 0:252ce694a71e 40 master.frequency(100000); //set clock frequency
sakthipriya 0:252ce694a71e 41 //master.start();
sakthipriya 0:252ce694a71e 42 /*while(write2slave)
sakthipriya 0:252ce694a71e 43 { *writedata = pc.getc();
sakthipriya 0:252ce694a71e 44 wait(0.5);
sakthipriya 0:252ce694a71e 45
sakthipriya 0:252ce694a71e 46 printf("master clk freq setup and addressing slave\n\r");
sakthipriya 0:252ce694a71e 47 master.start(); //initiating the data transfer
sakthipriya 0:252ce694a71e 48 master_status_write = (bool) master.write(addr|0x00,writedata,1);
sakthipriya 0:252ce694a71e 49 if(master_status_write==0)
sakthipriya 0:252ce694a71e 50 {
sakthipriya 0:252ce694a71e 51 printf("master has written %c to slave\n\r",*writedata);
sakthipriya 0:252ce694a71e 52 write2slave=false;
sakthipriya 0:252ce694a71e 53 }
sakthipriya 0:252ce694a71e 54
sakthipriya 0:252ce694a71e 55
sakthipriya 0:252ce694a71e 56 }*/
sakthipriya 0:252ce694a71e 57
sakthipriya 0:252ce694a71e 58 while(ack0)
sakthipriya 0:252ce694a71e 59 {
sakthipriya 0:252ce694a71e 60 //printf("2 master clk freq setup and addressing slave\n\r");
sakthipriya 0:252ce694a71e 61
sakthipriya 0:252ce694a71e 62 master.start(); //initiating the data transfer
sakthipriya 0:252ce694a71e 63 ack0 = master.read(addr,data,length);
sakthipriya 0:252ce694a71e 64 }
sakthipriya 0:252ce694a71e 65 if(!ack0)
sakthipriya 0:252ce694a71e 66 {
sakthipriya 0:252ce694a71e 67 printf("\n master has read %s from slave\n\r",data);
sakthipriya 0:252ce694a71e 68 loopvariable0=false;
sakthipriya 0:252ce694a71e 69 }
sakthipriya 0:252ce694a71e 70 //master.stop();
sakthipriya 0:252ce694a71e 71
sakthipriya 0:252ce694a71e 72 //printf("done\n\r");
sakthipriya 0:252ce694a71e 73 //delete data;
sakthipriya 0:252ce694a71e 74 interrupt=0;
sakthipriya 0:252ce694a71e 75 }
sakthipriya 0:252ce694a71e 76
sakthipriya 0:252ce694a71e 77 void T_I2C_MASTER_FSLAVE(void const *args)
sakthipriya 0:252ce694a71e 78 {
sakthipriya 0:252ce694a71e 79 char data_receive[25];
sakthipriya 0:252ce694a71e 80 while(1)
sakthipriya 0:252ce694a71e 81 {
sakthipriya 0:252ce694a71e 82 Thread::signal_wait(0x1);
sakthipriya 0:252ce694a71e 83 FUNC_I2C_MASTER_FSLAVE(data_receive,25);
sakthipriya 0:252ce694a71e 84 /*i2c_data * i2c_data_r = i2c_data_receive.alloc();
sakthipriya 0:252ce694a71e 85 strcpy(i2c_data_r->data , data_receive);
sakthipriya 0:252ce694a71e 86 i2c_data_r->length = 25;
sakthipriya 0:252ce694a71e 87 i2c_data_receive.put(i2c_data_r);*/
sakthipriya 0:252ce694a71e 88 printf("\n Data received from slave is %s\n\r",data_receive);
sakthipriya 0:252ce694a71e 89 }
sakthipriya 0:252ce694a71e 90 }
sakthipriya 0:252ce694a71e 91
sakthipriya 0:252ce694a71e 92 void FUNC_INT()
sakthipriya 0:252ce694a71e 93 {
sakthipriya 0:252ce694a71e 94
sakthipriya 0:252ce694a71e 95 ptr_t_i2c->signal_set(0x1);
sakthipriya 0:252ce694a71e 96
sakthipriya 0:252ce694a71e 97 }
sakthipriya 0:252ce694a71e 98
sakthipriya 0:252ce694a71e 99 char writedata;
sakthipriya 0:252ce694a71e 100 bool write2slave;
sakthipriya 0:252ce694a71e 101 bool master_status_write;
sakthipriya 0:252ce694a71e 102 void FUNC_MASTER_WRITE()
sakthipriya 0:252ce694a71e 103 { //wait(1);
sakthipriya 0:252ce694a71e 104 write2slave=true;
sakthipriya 0:252ce694a71e 105
sakthipriya 0:252ce694a71e 106
sakthipriya 0:252ce694a71e 107
sakthipriya 0:252ce694a71e 108 char data = pc.getc();
sakthipriya 0:252ce694a71e 109 interrupt = 1;
sakthipriya 0:252ce694a71e 110 i2c_data * i2c_data_s = i2c_data_send.alloc();
sakthipriya 0:252ce694a71e 111 i2c_data_s->data = data;
sakthipriya 0:252ce694a71e 112 i2c_data_s->length = 1;
sakthipriya 0:252ce694a71e 113 i2c_data_send.put(i2c_data_s);
sakthipriya 0:252ce694a71e 114 master_status_write = true;
sakthipriya 0:252ce694a71e 115
sakthipriya 0:252ce694a71e 116 // interrupt = 1;
sakthipriya 0:252ce694a71e 117
sakthipriya 0:252ce694a71e 118 osEvent evt = i2c_data_send.get();
sakthipriya 0:252ce694a71e 119 if (evt.status == osEventMail)
sakthipriya 0:252ce694a71e 120 {
sakthipriya 0:252ce694a71e 121 i2c_data *i2c_data_s = (i2c_data*)evt.value.p;
sakthipriya 0:252ce694a71e 122 writedata = i2c_data_s -> data;
sakthipriya 0:252ce694a71e 123 master.frequency(100000); //set clock frequency
sakthipriya 0:252ce694a71e 124 while(write2slave)
sakthipriya 0:252ce694a71e 125 {
sakthipriya 0:252ce694a71e 126 printf("master clk freq setup and addressing slave\n\r");
sakthipriya 0:252ce694a71e 127 master.start(); //initiating the data transfer
sakthipriya 0:252ce694a71e 128 master_status_write = (bool) master.write(addr|0x00,&writedata,1);
sakthipriya 0:252ce694a71e 129 if(master_status_write==0)
sakthipriya 0:252ce694a71e 130 {
sakthipriya 0:252ce694a71e 131 printf("master has written %c to slave\n\r",writedata);
sakthipriya 0:252ce694a71e 132 write2slave=false;
sakthipriya 0:252ce694a71e 133 }
sakthipriya 0:252ce694a71e 134 i2c_data_send.free(i2c_data_s);
sakthipriya 0:252ce694a71e 135 }
sakthipriya 0:252ce694a71e 136 }
sakthipriya 0:252ce694a71e 137 interrupt = 0;
sakthipriya 0:252ce694a71e 138 }
sakthipriya 0:252ce694a71e 139
sakthipriya 0:252ce694a71e 140
sakthipriya 0:252ce694a71e 141
sakthipriya 0:252ce694a71e 142 int main()
sakthipriya 0:252ce694a71e 143 {
sakthipriya 0:252ce694a71e 144 ptr_t_i2c = new Thread(T_I2C_MASTER_FSLAVE);
sakthipriya 0:252ce694a71e 145 data_ready.rise(&FUNC_INT);
sakthipriya 0:252ce694a71e 146 printf("\nstarted master\n");
sakthipriya 0:252ce694a71e 147 while(1)
sakthipriya 0:252ce694a71e 148 { //Thread::wait(9000);
sakthipriya 0:252ce694a71e 149 //interrupt = 1;
sakthipriya 0:252ce694a71e 150
sakthipriya 0:252ce694a71e 151 FUNC_MASTER_WRITE();
sakthipriya 0:252ce694a71e 152 //interrupt = 0;
sakthipriya 0:252ce694a71e 153 ;
sakthipriya 0:252ce694a71e 154 }
sakthipriya 0:252ce694a71e 155 }