sakthi priya amirtharaj / Mbed 2 deprecated i2c_std_alone

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Dependencies:   mbed-rtos mbed

Fork of slave_working_obama by green rosh

main.cpp@8:04b912dc2443, 2014-12-13 (annotated)

Committer:
sakthipriya
Date:
Sat Dec 13 11:22:34 2014 +0000
Revision:
8:04b912dc2443
Parent:
7:debeb7070a54
Child:
9:baf5de5828c9
i2c working

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);
sakthipriya 8:04b912dc2443 9 InterruptIn master_reset(D11);
greenroshks 5:ce0bb4174ca4 10 DigitalOut data_ready(D10);
greenroshks 5:ce0bb4174ca4 11 int i2c_status=0; //read/write mode for i2c 0 : write2slave, 1 : write2master
sakthipriya 8:04b912dc2443 12 int reset=0;
sakthipriya 8:04b912dc2443 13 int temp;
sakthipriya 8:04b912dc2443 14
greenroshks 4:133b49d51b18 15
greenroshks 4:133b49d51b18 16 typedef struct
greenroshks 2:458f9e603814 17 {
greenroshks 4:133b49d51b18 18 char data; // To avoid dynamic memory allocation
greenroshks 4:133b49d51b18 19 int length;
greenroshks 4:133b49d51b18 20 }i2c_data;
viswachaitanya 0:24e80ff2c7b1 21
greenroshks 4:133b49d51b18 22 Mail<i2c_data,16> i2c_data_receive;
greenroshks 4:133b49d51b18 23 Mail<i2c_data,16> i2c_data_send;
raizel_varun 6:8aea752c6eda 24
sakthipriya 8:04b912dc2443 25
greenroshks 5:ce0bb4174ca4 26 void FUNC_I2C_WRITE2CDMS(char *data, int length=1)
greenroshks 4:133b49d51b18 27 {
raizel_varun 6:8aea752c6eda 28 int slave_status = 1;
raizel_varun 6:8aea752c6eda 29
greenroshks 2:458f9e603814 30 while(slave_status)
greenroshks 2:458f9e603814 31 {
viswachaitanya 0:24e80ff2c7b1 32 slave.address(0x20);
greenroshks 2:458f9e603814 33 if(slave.receive()==1)
greenroshks 2:458f9e603814 34 {
greenroshks 5:ce0bb4174ca4 35 slave_status=slave.write(data,length);
sakthipriya 7:debeb7070a54 36
greenroshks 2:458f9e603814 37
viswachaitanya 0:24e80ff2c7b1 38 }
sakthipriya 8:04b912dc2443 39 else if(slave.receive()==3 || slave.receive()==2)
sakthipriya 8:04b912dc2443 40 {
sakthipriya 8:04b912dc2443 41 slave_status=slave.read(data,length);
sakthipriya 8:04b912dc2443 42 }
sakthipriya 8:04b912dc2443 43
greenroshks 2:458f9e603814 44 }
sakthipriya 8:04b912dc2443 45 printf("\ndone\n\r");
greenroshks 4:133b49d51b18 46
greenroshks 2:458f9e603814 47 }
greenroshks 2:458f9e603814 48
greenroshks 4:133b49d51b18 49 void T_I2C_BAE(void const * args)
greenroshks 2:458f9e603814 50 {
greenroshks 4:133b49d51b18 51 char data_send,data_receive;
greenroshks 4:133b49d51b18 52 while(1)
greenroshks 4:133b49d51b18 53 {
greenroshks 4:133b49d51b18 54 Thread::signal_wait(0x1);
sakthipriya 8:04b912dc2443 55 //i2c_status = temp;
sakthipriya 8:04b912dc2443 56 //wait(0.5);
sakthipriya 8:04b912dc2443 57 printf("\n entered thread\n\r");
sakthipriya 8:04b912dc2443 58 if(i2c_status == 0 && reset !=1)
greenroshks 5:ce0bb4174ca4 59 {
greenroshks 5:ce0bb4174ca4 60
greenroshks 5:ce0bb4174ca4 61 FUNC_I2C_WRITE2CDMS(&data_receive);
greenroshks 5:ce0bb4174ca4 62 i2c_data * i2c_data_r = i2c_data_receive.alloc();
greenroshks 5:ce0bb4174ca4 63 i2c_data_r->data = data_receive;
greenroshks 5:ce0bb4174ca4 64 i2c_data_r->length = 1;
greenroshks 5:ce0bb4174ca4 65 i2c_data_receive.put(i2c_data_r);
sakthipriya 8:04b912dc2443 66 printf("\n Data received from CDMS is %c\n\r",data_receive);
sakthipriya 8:04b912dc2443 67 i2c_data_receive.free(i2c_data_r); // This has to be done from a differen thread
raizel_varun 6:8aea752c6eda 68
greenroshks 5:ce0bb4174ca4 69 }
sakthipriya 8:04b912dc2443 70 else if(i2c_status ==1 && reset !=1)
greenroshks 5:ce0bb4174ca4 71 {
greenroshks 5:ce0bb4174ca4 72 osEvent evt = i2c_data_send.get();
greenroshks 5:ce0bb4174ca4 73 if (evt.status == osEventMail)
greenroshks 5:ce0bb4174ca4 74 {
greenroshks 5:ce0bb4174ca4 75 i2c_data *i2c_data_s = (i2c_data*)evt.value.p;
greenroshks 5:ce0bb4174ca4 76 data_send = i2c_data_s -> data;
greenroshks 5:ce0bb4174ca4 77 FUNC_I2C_WRITE2CDMS(&data_send);
sakthipriya 8:04b912dc2443 78 printf("\nData sent to CDMS is %c\n\r",data_send);
greenroshks 5:ce0bb4174ca4 79 i2c_data_send.free(i2c_data_s);
greenroshks 5:ce0bb4174ca4 80 i2c_status = 0;
sakthipriya 8:04b912dc2443 81 //temp = i2c_status;
greenroshks 5:ce0bb4174ca4 82 }
raizel_varun 6:8aea752c6eda 83 }
raizel_varun 6:8aea752c6eda 84
greenroshks 4:133b49d51b18 85 }
greenroshks 2:458f9e603814 86 }
greenroshks 4:133b49d51b18 87
greenroshks 4:133b49d51b18 88 void FUNC_INT()
greenroshks 4:133b49d51b18 89 {
sakthipriya 8:04b912dc2443 90 reset = 0;
greenroshks 4:133b49d51b18 91 ptr_t_i2c->signal_set(0x1);
sakthipriya 7:debeb7070a54 92
greenroshks 4:133b49d51b18 93 }
sakthipriya 7:debeb7070a54 94
sakthipriya 8:04b912dc2443 95 void FUNC_RESET()
sakthipriya 8:04b912dc2443 96 {
sakthipriya 8:04b912dc2443 97 reset = 1;
sakthipriya 8:04b912dc2443 98 }
sakthipriya 8:04b912dc2443 99
sakthipriya 7:debeb7070a54 100 void ir2master()
sakthipriya 7:debeb7070a54 101 {
sakthipriya 8:04b912dc2443 102
sakthipriya 8:04b912dc2443 103 char data='a';
sakthipriya 7:debeb7070a54 104 data_ready=0;
sakthipriya 7:debeb7070a54 105 data = pc.getc();
sakthipriya 8:04b912dc2443 106 reset =0;
sakthipriya 7:debeb7070a54 107 i2c_status=1;
sakthipriya 7:debeb7070a54 108 i2c_data * i2c_data_s = i2c_data_send.alloc();
sakthipriya 7:debeb7070a54 109 i2c_data_s->data = data;
sakthipriya 7:debeb7070a54 110 i2c_data_s->length = 1;
sakthipriya 7:debeb7070a54 111 i2c_data_send.put(i2c_data_s);
sakthipriya 7:debeb7070a54 112 data_ready=1;
sakthipriya 8:04b912dc2443 113 //temp = i2c_status;
sakthipriya 7:debeb7070a54 114 }
sakthipriya 7:debeb7070a54 115
greenroshks 4:133b49d51b18 116
greenroshks 4:133b49d51b18 117
greenroshks 4:133b49d51b18 118
raizel_varun 6:8aea752c6eda 119 int main()
raizel_varun 6:8aea752c6eda 120 {
sakthipriya 8:04b912dc2443 121 printf("\n slave started\n\r");
raizel_varun 6:8aea752c6eda 122
greenroshks 4:133b49d51b18 123 ptr_t_i2c = new Thread(T_I2C_BAE);
sakthipriya 8:04b912dc2443 124 master_reset.fall(&FUNC_RESET);
greenroshks 4:133b49d51b18 125 interrupt.rise(&FUNC_INT);
greenroshks 2:458f9e603814 126 while(1)
greenroshks 2:458f9e603814 127 {
sakthipriya 7:debeb7070a54 128 ir2master();
greenroshks 5:ce0bb4174ca4 129
greenroshks 2:458f9e603814 130 }
raizel_varun 6:8aea752c6eda 131
raizel_varun 6:8aea752c6eda 132 }
raizel_varun 6:8aea752c6eda 133
raizel_varun 6:8aea752c6eda 134
raizel_varun 6:8aea752c6eda 135
raizel_varun 6:8aea752c6eda 136