green rosh / Mbed 2 deprecated master_working_obama

while loop removed ( master to slave not working )

Dependencies:   mbed-rtos mbed

Fork of master_working_obama by sakthi priya amirtharaj

main.cpp@6:efcbb48e0d03, 2015-01-24 (annotated)

Committer:
greenroshks
Date:
Sat Jan 24 11:48:32 2015 +0000
Revision:
6:efcbb48e0d03
Parent:
5:cb35b461fa29
Child:
7:0d18080e16ce
with while loop removed ( master sending to slave not working )

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sakthipriya 0:58b0c597a58c 1 #include "mbed.h"
sakthipriya 0:58b0c597a58c 2 #include "rtos.h"
sakthipriya 0:58b0c597a58c 3
sakthipriya 0:58b0c597a58c 4 const int addr = 0x20; //slave address
sakthipriya 0:58b0c597a58c 5 I2C master (D14,D15); //configure pins p27,p28 as I2C master
sakthipriya 0:58b0c597a58c 6 Serial pc (USBTX,USBRX);
sakthipriya 0:58b0c597a58c 7 DigitalOut interrupt(D9);
sakthipriya 0:58b0c597a58c 8 InterruptIn data_ready(D10);
greenroshks 6:efcbb48e0d03 9 Timer t;
sakthipriya 0:58b0c597a58c 10
sakthipriya 0:58b0c597a58c 11 int reset;
sakthipriya 0:58b0c597a58c 12
sakthipriya 0:58b0c597a58c 13 typedef struct
sakthipriya 0:58b0c597a58c 14 {
sakthipriya 0:58b0c597a58c 15 char data; // To avoid dynamic memory allocation
sakthipriya 0:58b0c597a58c 16 int length;
sakthipriya 0:58b0c597a58c 17 }i2c_data;
sakthipriya 0:58b0c597a58c 18
sakthipriya 0:58b0c597a58c 19 Mail<i2c_data,16> i2c_data_receive;
sakthipriya 0:58b0c597a58c 20 Mail<i2c_data,16> i2c_data_send;
sakthipriya 4:7992ea5e41ed 21 unsigned char* data_reg = (unsigned char*)0x40067004;
sakthipriya 4:7992ea5e41ed 22 unsigned char* status_reg = (unsigned char*)0x40067003;
sakthipriya 4:7992ea5e41ed 23 unsigned char* c1_reg = (unsigned char*)0x40067002;
sakthipriya 4:7992ea5e41ed 24 unsigned char* c2_reg = (unsigned char*)0x40067005;
sakthipriya 4:7992ea5e41ed 25 unsigned char* freq_reg = (unsigned char*)0x40067001;
sakthipriya 0:58b0c597a58c 26
sakthipriya 0:58b0c597a58c 27 Thread * ptr_t_i2c;
sakthipriya 0:58b0c597a58c 28 void FUNC_I2C_MASTER_FSLAVE(char * data,int length)
sakthipriya 0:58b0c597a58c 29 {
sakthipriya 0:58b0c597a58c 30 //printf("press backspace for master to start \n\r");
sakthipriya 0:58b0c597a58c 31 //while(1){
sakthipriya 0:58b0c597a58c 32 //interrupt = 0;
sakthipriya 0:58b0c597a58c 33 // if(pc.getc()=='z'){
greenroshks 6:efcbb48e0d03 34 wait(0.2);
greenroshks 6:efcbb48e0d03 35
sakthipriya 0:58b0c597a58c 36 interrupt = 1;
greenroshks 6:efcbb48e0d03 37 //printf("\nMaster executed\n");
sakthipriya 0:58b0c597a58c 38
sakthipriya 0:58b0c597a58c 39
sakthipriya 0:58b0c597a58c 40 bool ack0 =true;
sakthipriya 0:58b0c597a58c 41 bool loopvariable0 =true;
sakthipriya 0:58b0c597a58c 42 //char *data = new char;
sakthipriya 0:58b0c597a58c 43 //*data = 'b';
sakthipriya 0:58b0c597a58c 44
sakthipriya 0:58b0c597a58c 45
sakthipriya 0:58b0c597a58c 46
sakthipriya 5:cb35b461fa29 47 // master.frequency(100000); //set clock frequency
greenroshks 6:efcbb48e0d03 48 // master.start();
sakthipriya 0:58b0c597a58c 49 /*while(write2slave)
sakthipriya 0:58b0c597a58c 50 { *writedata = pc.getc();
sakthipriya 0:58b0c597a58c 51 wait(0.5);
sakthipriya 0:58b0c597a58c 52
sakthipriya 0:58b0c597a58c 53 printf("master clk freq setup and addressing slave\n\r");
sakthipriya 0:58b0c597a58c 54 master.start(); //initiating the data transfer
sakthipriya 0:58b0c597a58c 55 master_status_write = (bool) master.write(addr|0x00,writedata,1);
sakthipriya 0:58b0c597a58c 56 if(master_status_write==0)
sakthipriya 0:58b0c597a58c 57 {
sakthipriya 0:58b0c597a58c 58 printf("master has written %c to slave\n\r",*writedata);
sakthipriya 0:58b0c597a58c 59 write2slave=false;
sakthipriya 0:58b0c597a58c 60 }
sakthipriya 0:58b0c597a58c 61
sakthipriya 0:58b0c597a58c 62
sakthipriya 0:58b0c597a58c 63 }*/
greenroshks 3:7a895e0fdd45 64 //wait(0.5);
greenroshks 6:efcbb48e0d03 65 //while(ack0 )
greenroshks 6:efcbb48e0d03 66 //{
sakthipriya 4:7992ea5e41ed 67 //printf("\n\r %x \n",addr);
sakthipriya 0:58b0c597a58c 68
sakthipriya 4:7992ea5e41ed 69 //initiating the data transfer
sakthipriya 4:7992ea5e41ed 70 ack0 = master.read(addr|1,data,length);
sakthipriya 4:7992ea5e41ed 71 //printf("\nready to receive\n");
sakthipriya 4:7992ea5e41ed 72
greenroshks 6:efcbb48e0d03 73 //}
sakthipriya 4:7992ea5e41ed 74
sakthipriya 4:7992ea5e41ed 75 if(!ack0 )
sakthipriya 0:58b0c597a58c 76 {
sakthipriya 0:58b0c597a58c 77 printf("\n master has read %c from slave\n\r",*data);
sakthipriya 5:cb35b461fa29 78 //printf("\n \r %d %d %d %d %d\n",*data_reg,*status_reg,*c1_reg,*c2_reg,*freq_reg);
sakthipriya 0:58b0c597a58c 79 loopvariable0=false;
sakthipriya 0:58b0c597a58c 80 }
sakthipriya 0:58b0c597a58c 81 //master.stop();
sakthipriya 0:58b0c597a58c 82
sakthipriya 0:58b0c597a58c 83 //printf("done\n\r");
sakthipriya 0:58b0c597a58c 84 //delete data;
sakthipriya 0:58b0c597a58c 85 interrupt=0;
greenroshks 6:efcbb48e0d03 86
greenroshks 6:efcbb48e0d03 87
greenroshks 6:efcbb48e0d03 88
sakthipriya 0:58b0c597a58c 89 }
sakthipriya 0:58b0c597a58c 90
sakthipriya 0:58b0c597a58c 91 void T_I2C_MASTER_FSLAVE(void const *args)
sakthipriya 0:58b0c597a58c 92 {
sakthipriya 0:58b0c597a58c 93 char data_receive;
sakthipriya 0:58b0c597a58c 94 while(1)
sakthipriya 0:58b0c597a58c 95 {
sakthipriya 0:58b0c597a58c 96 Thread::signal_wait(0x1);
sakthipriya 0:58b0c597a58c 97 FUNC_I2C_MASTER_FSLAVE(&data_receive,1);
sakthipriya 0:58b0c597a58c 98 i2c_data * i2c_data_r = i2c_data_receive.alloc();
sakthipriya 0:58b0c597a58c 99 i2c_data_r->data = data_receive;
sakthipriya 0:58b0c597a58c 100 i2c_data_r->length = 1;
sakthipriya 0:58b0c597a58c 101 i2c_data_receive.put(i2c_data_r);
sakthipriya 1:e5c939440756 102 printf("\n Data received from slave is %c\n\r",data_receive);
sakthipriya 0:58b0c597a58c 103 i2c_data_receive.free(i2c_data_r);
sakthipriya 0:58b0c597a58c 104 }
sakthipriya 0:58b0c597a58c 105 }
sakthipriya 0:58b0c597a58c 106
sakthipriya 0:58b0c597a58c 107 void FUNC_INT()
sakthipriya 0:58b0c597a58c 108 {
sakthipriya 0:58b0c597a58c 109
sakthipriya 0:58b0c597a58c 110 ptr_t_i2c->signal_set(0x1);
sakthipriya 0:58b0c597a58c 111
sakthipriya 0:58b0c597a58c 112 }
sakthipriya 0:58b0c597a58c 113
sakthipriya 1:e5c939440756 114 char *writedata = new char;
sakthipriya 1:e5c939440756 115 void FUNC_MASTER_WRITE()
sakthipriya 1:e5c939440756 116 {
sakthipriya 1:e5c939440756 117 bool write2slave=true;
sakthipriya 0:58b0c597a58c 118
sakthipriya 0:58b0c597a58c 119 interrupt = 0;
sakthipriya 1:e5c939440756 120
sakthipriya 1:e5c939440756 121 char data = pc.getc();
sakthipriya 1:e5c939440756 122 i2c_data * i2c_data_s = i2c_data_send.alloc();
sakthipriya 1:e5c939440756 123 i2c_data_s->data = data;
sakthipriya 1:e5c939440756 124 i2c_data_s->length = 1;
sakthipriya 1:e5c939440756 125 i2c_data_send.put(i2c_data_s);
sakthipriya 1:e5c939440756 126 bool master_status_write = true;
greenroshks 6:efcbb48e0d03 127 interrupt = 1;
greenroshks 6:efcbb48e0d03 128
sakthipriya 1:e5c939440756 129 osEvent evt = i2c_data_send.get();
sakthipriya 1:e5c939440756 130 if (evt.status == osEventMail)
sakthipriya 1:e5c939440756 131 {
sakthipriya 1:e5c939440756 132 i2c_data *i2c_data_s = (i2c_data*)evt.value.p;
sakthipriya 1:e5c939440756 133 *writedata = i2c_data_s -> data;
sakthipriya 5:cb35b461fa29 134 //master.frequency(100000); //set clock frequency
greenroshks 6:efcbb48e0d03 135 if(interrupt ==1)
sakthipriya 1:e5c939440756 136 {
greenroshks 6:efcbb48e0d03 137 printf("\nhere\n");
sakthipriya 4:7992ea5e41ed 138 //master.start(); //initiating the data transfer
sakthipriya 0:58b0c597a58c 139 master_status_write = (bool) master.write(addr|0x00,writedata,1);
sakthipriya 0:58b0c597a58c 140 if(master_status_write==0)
sakthipriya 0:58b0c597a58c 141 {
sakthipriya 0:58b0c597a58c 142 printf("master has written %c to slave\n\r",*writedata);
sakthipriya 0:58b0c597a58c 143 write2slave=false;
sakthipriya 0:58b0c597a58c 144 }
sakthipriya 2:e80af3c366aa 145 i2c_data_send.free(i2c_data_s);
sakthipriya 5:cb35b461fa29 146 //printf("\n \r %d %d %d %d %d\n",*data_reg,*status_reg,*c1_reg,*c2_reg,*freq_reg);
sakthipriya 1:e5c939440756 147 }
sakthipriya 0:58b0c597a58c 148 }
sakthipriya 1:e5c939440756 149 }
sakthipriya 1:e5c939440756 150
sakthipriya 1:e5c939440756 151
sakthipriya 1:e5c939440756 152
sakthipriya 1:e5c939440756 153 int main()
sakthipriya 1:e5c939440756 154 {
greenroshks 6:efcbb48e0d03 155
sakthipriya 4:7992ea5e41ed 156 int i= 0;
greenroshks 6:efcbb48e0d03 157 //master.start();
sakthipriya 5:cb35b461fa29 158 master.frequency(100000);
sakthipriya 1:e5c939440756 159 ptr_t_i2c = new Thread(T_I2C_MASTER_FSLAVE);
greenroshks 6:efcbb48e0d03 160
sakthipriya 1:e5c939440756 161 data_ready.rise(&FUNC_INT);
sakthipriya 1:e5c939440756 162 printf("\nstarted master\n");
sakthipriya 4:7992ea5e41ed 163 //master.start();
sakthipriya 1:e5c939440756 164 while(1)
sakthipriya 1:e5c939440756 165 {
sakthipriya 1:e5c939440756 166 FUNC_MASTER_WRITE();
sakthipriya 2:e80af3c366aa 167
sakthipriya 0:58b0c597a58c 168 }
sakthipriya 0:58b0c597a58c 169 }