sakthi priya amirtharaj / Mbed 2 deprecated slave_working1_1

i2c slave working version 1.1

Dependencies:   mbed-rtos mbed

Fork of slave_i2c3 by sakthi priya amirtharaj

main.cpp@5:ce0bb4174ca4, 2014-12-10 (annotated)

Committer:
greenroshks
Date:
Wed Dec 10 16:38:29 2014 +0000
Revision:
5:ce0bb4174ca4
Parent:
4:133b49d51b18
Child:
6:8aea752c6eda
i2c slave completed

Who changed what in which revision?

UserRevisionLine numberNew contents of line
viswachaitanya 0:24e80ff2c7b1 1 #include "mbed.h"
greenroshks 4:133b49d51b18 2 #include "rtos.h"
viswachaitanya 0:24e80ff2c7b1 3
viswachaitanya 0:24e80ff2c7b1 4 void write_to_master(char); //function to write data to master
greenroshks 4:133b49d51b18 5 Thread * ptr_t_i2c;
viswachaitanya 0:24e80ff2c7b1 6 I2CSlave slave(D14,D15); //configuring pins p27, p28 as I2Cslave
viswachaitanya 0:24e80ff2c7b1 7 Serial pc (USBTX,USBRX);
greenroshks 2:458f9e603814 8 InterruptIn interrupt(D9);
greenroshks 5:ce0bb4174ca4 9 DigitalOut data_ready(D10);
greenroshks 5:ce0bb4174ca4 10 int i2c_status=0; //read/write mode for i2c 0 : write2slave, 1 : write2master
greenroshks 4:133b49d51b18 11
greenroshks 4:133b49d51b18 12 typedef struct
greenroshks 2:458f9e603814 13 {
greenroshks 4:133b49d51b18 14 char data; // To avoid dynamic memory allocation
greenroshks 4:133b49d51b18 15 int length;
greenroshks 4:133b49d51b18 16 }i2c_data;
viswachaitanya 0:24e80ff2c7b1 17
greenroshks 4:133b49d51b18 18 Mail<i2c_data,16> i2c_data_receive;
greenroshks 4:133b49d51b18 19 Mail<i2c_data,16> i2c_data_send;
greenroshks 4:133b49d51b18 20
greenroshks 5:ce0bb4174ca4 21 void FUNC_I2C_WRITE2CDMS(char *data, int length=1)
greenroshks 4:133b49d51b18 22 {
greenroshks 4:133b49d51b18 23
greenroshks 2:458f9e603814 24 int slave_status = 1;
greenroshks 2:458f9e603814 25 while(slave_status)
greenroshks 2:458f9e603814 26 {
viswachaitanya 0:24e80ff2c7b1 27 slave.address(0x20);
greenroshks 2:458f9e603814 28 if(slave.receive()==1)
greenroshks 2:458f9e603814 29 {
greenroshks 5:ce0bb4174ca4 30 slave_status=slave.write(data,length);
greenroshks 3:5e68dd4bbb70 31 // printf("\n In the while loop\n");
greenroshks 2:458f9e603814 32
greenroshks 4:133b49d51b18 33 /*if(!slave_status)
greenroshks 2:458f9e603814 34 {
greenroshks 3:5e68dd4bbb70 35 printf("slave wrote %c to master\n\r",*data);
greenroshks 2:458f9e603814 36
greenroshks 3:5e68dd4bbb70 37 }*/
greenroshks 2:458f9e603814 38
viswachaitanya 0:24e80ff2c7b1 39 }
greenroshks 3:5e68dd4bbb70 40 else
greenroshks 3:5e68dd4bbb70 41 if(slave.receive()==3 || slave.receive()==2)
greenroshks 3:5e68dd4bbb70 42 {
greenroshks 4:133b49d51b18 43 //i2c_data *i2c_data_r = i2c_data_receive.alloc();
greenroshks 5:ce0bb4174ca4 44 slave_status=slave.read(data,length);
greenroshks 3:5e68dd4bbb70 45 /*if(!slave_status)
greenroshks 3:5e68dd4bbb70 46 {
greenroshks 3:5e68dd4bbb70 47 printf("1 read %c from master\n\r",*data);
greenroshks 3:5e68dd4bbb70 48 }*/
greenroshks 3:5e68dd4bbb70 49 }
greenroshks 2:458f9e603814 50 //slave.stop();
greenroshks 2:458f9e603814 51 }
viswachaitanya 0:24e80ff2c7b1 52 printf("2 done");
greenroshks 4:133b49d51b18 53
greenroshks 2:458f9e603814 54 }
greenroshks 2:458f9e603814 55
greenroshks 4:133b49d51b18 56 void T_I2C_BAE(void const * args)
greenroshks 2:458f9e603814 57 {
greenroshks 4:133b49d51b18 58 char data_send,data_receive;
greenroshks 5:ce0bb4174ca4 59 //data_send = 'a';
greenroshks 4:133b49d51b18 60 while(1)
greenroshks 4:133b49d51b18 61 {
greenroshks 4:133b49d51b18 62 Thread::signal_wait(0x1);
greenroshks 5:ce0bb4174ca4 63 if(i2c_status == 0)
greenroshks 5:ce0bb4174ca4 64 {
greenroshks 5:ce0bb4174ca4 65
greenroshks 5:ce0bb4174ca4 66 FUNC_I2C_WRITE2CDMS(&data_receive);
greenroshks 5:ce0bb4174ca4 67 //printf("\n Data received from CDMS is %c\n",data_receive);
greenroshks 5:ce0bb4174ca4 68 i2c_data * i2c_data_r = i2c_data_receive.alloc();
greenroshks 5:ce0bb4174ca4 69 i2c_data_r->data = data_receive;
greenroshks 5:ce0bb4174ca4 70 i2c_data_r->length = 1;
greenroshks 5:ce0bb4174ca4 71 i2c_data_receive.put(i2c_data_r);
greenroshks 5:ce0bb4174ca4 72 }
greenroshks 5:ce0bb4174ca4 73 else if(i2c_status ==1 )
greenroshks 5:ce0bb4174ca4 74 {
greenroshks 5:ce0bb4174ca4 75 osEvent evt = i2c_data_send.get();
greenroshks 5:ce0bb4174ca4 76 if (evt.status == osEventMail)
greenroshks 5:ce0bb4174ca4 77 {
greenroshks 5:ce0bb4174ca4 78 i2c_data *i2c_data_s = (i2c_data*)evt.value.p;
greenroshks 5:ce0bb4174ca4 79 //printf("\nData read from CDMS is %c\n",i2c_data_r->data);
greenroshks 5:ce0bb4174ca4 80 data_send = i2c_data_s -> data;
greenroshks 5:ce0bb4174ca4 81 FUNC_I2C_WRITE2CDMS(&data_send);
greenroshks 5:ce0bb4174ca4 82 printf("\nData sent to CDMS is %c\n",data_send);
greenroshks 5:ce0bb4174ca4 83 i2c_data_send.free(i2c_data_s);
greenroshks 5:ce0bb4174ca4 84 i2c_status = 0;
greenroshks 5:ce0bb4174ca4 85 //delete i2c_data_r;
greenroshks 5:ce0bb4174ca4 86 }
greenroshks 5:ce0bb4174ca4 87 }
greenroshks 4:133b49d51b18 88 }
greenroshks 2:458f9e603814 89 }
greenroshks 4:133b49d51b18 90
greenroshks 4:133b49d51b18 91 void FUNC_INT()
greenroshks 4:133b49d51b18 92 {
greenroshks 4:133b49d51b18 93 // char * data = new char;
greenroshks 4:133b49d51b18 94 //*data = 'a';
greenroshks 4:133b49d51b18 95 ptr_t_i2c->signal_set(0x1);
greenroshks 4:133b49d51b18 96 //delete data;
greenroshks 4:133b49d51b18 97 }
greenroshks 4:133b49d51b18 98
greenroshks 4:133b49d51b18 99
greenroshks 4:133b49d51b18 100
greenroshks 2:458f9e603814 101 void main()
greenroshks 2:458f9e603814 102 {
greenroshks 2:458f9e603814 103 printf("\nStarted slave... waiting for master\n");
greenroshks 4:133b49d51b18 104 ptr_t_i2c = new Thread(T_I2C_BAE);
greenroshks 4:133b49d51b18 105 char data='a';
greenroshks 4:133b49d51b18 106 interrupt.rise(&FUNC_INT);
greenroshks 2:458f9e603814 107 while(1)
greenroshks 2:458f9e603814 108 {
greenroshks 2:458f9e603814 109 //*(data_send)=pc.getc();
greenroshks 2:458f9e603814 110
greenroshks 4:133b49d51b18 111 //FUNC_I2C_WRITE2CDMS(&data,1);
greenroshks 4:133b49d51b18 112 //printf("\n The data send or received by slave is %c\n",data);
greenroshks 4:133b49d51b18 113 //(data)++;
greenroshks 2:458f9e603814 114 //wait(1);
greenroshks 5:ce0bb4174ca4 115 //Remove the comments for receiving data
greenroshks 5:ce0bb4174ca4 116 /* osEvent evt = i2c_data_receive.get();
greenroshks 4:133b49d51b18 117 if (evt.status == osEventMail)
greenroshks 4:133b49d51b18 118 {
greenroshks 4:133b49d51b18 119 i2c_data *i2c_data_r = (i2c_data*)evt.value.p;
greenroshks 4:133b49d51b18 120 printf("\nData read from CDMS is %c\n",i2c_data_r->data);
greenroshks 4:133b49d51b18 121
greenroshks 4:133b49d51b18 122 i2c_data_receive.free(i2c_data_r);
greenroshks 4:133b49d51b18 123 //delete i2c_data_r;
greenroshks 5:ce0bb4174ca4 124 }*/
greenroshks 5:ce0bb4174ca4 125 //put in comments for receiving data
greenroshks 5:ce0bb4174ca4 126 data_ready=0;
greenroshks 5:ce0bb4174ca4 127 data = pc.getc();
greenroshks 5:ce0bb4174ca4 128 i2c_data * i2c_data_s = i2c_data_send.alloc();
greenroshks 5:ce0bb4174ca4 129 i2c_data_s->data = data;
greenroshks 5:ce0bb4174ca4 130 i2c_data_s->length = 1;
greenroshks 5:ce0bb4174ca4 131 i2c_data_send.put(i2c_data_s);
greenroshks 5:ce0bb4174ca4 132 data_ready=1;
greenroshks 5:ce0bb4174ca4 133 i2c_status=1;
greenroshks 5:ce0bb4174ca4 134
greenroshks 2:458f9e603814 135 }
greenroshks 2:458f9e603814 136 }