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@7:0d18080e16ce, 2015-01-26 (annotated)

Committer:
greenroshks
Date:
Mon Jan 26 11:11:59 2015 +0000
Revision:
7:0d18080e16ce
Parent:
6:efcbb48e0d03 
with timeouts and timers

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;
greenroshks 7:0d18080e16ce 10 Timer t2;
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 7:0d18080e16ce 34
greenroshks 6:efcbb48e0d03 35
sakthipriya 0:58b0c597a58c 36 interrupt = 1;
greenroshks 7:0d18080e16ce 37 t2.start();
greenroshks 6:efcbb48e0d03 38 //printf("\nMaster executed\n");
sakthipriya 0:58b0c597a58c 39
sakthipriya 0:58b0c597a58c 40
sakthipriya 0:58b0c597a58c 41 bool ack0 =true;
sakthipriya 0:58b0c597a58c 42 bool loopvariable0 =true;
sakthipriya 0:58b0c597a58c 43 //char *data = new char;
sakthipriya 0:58b0c597a58c 44 //*data = 'b';
sakthipriya 0:58b0c597a58c 45
sakthipriya 0:58b0c597a58c 46
sakthipriya 0:58b0c597a58c 47
sakthipriya 5:cb35b461fa29 48 // master.frequency(100000); //set clock frequency
greenroshks 6:efcbb48e0d03 49 // master.start();
sakthipriya 0:58b0c597a58c 50 /*while(write2slave)
sakthipriya 0:58b0c597a58c 51 { *writedata = pc.getc();
sakthipriya 0:58b0c597a58c 52 wait(0.5);
sakthipriya 0:58b0c597a58c 53
sakthipriya 0:58b0c597a58c 54 printf("master clk freq setup and addressing slave\n\r");
sakthipriya 0:58b0c597a58c 55 master.start(); //initiating the data transfer
sakthipriya 0:58b0c597a58c 56 master_status_write = (bool) master.write(addr|0x00,writedata,1);
sakthipriya 0:58b0c597a58c 57 if(master_status_write==0)
sakthipriya 0:58b0c597a58c 58 {
sakthipriya 0:58b0c597a58c 59 printf("master has written %c to slave\n\r",*writedata);
sakthipriya 0:58b0c597a58c 60 write2slave=false;
sakthipriya 0:58b0c597a58c 61 }
sakthipriya 0:58b0c597a58c 62
sakthipriya 0:58b0c597a58c 63
sakthipriya 0:58b0c597a58c 64 }*/
greenroshks 3:7a895e0fdd45 65 //wait(0.5);
greenroshks 6:efcbb48e0d03 66 //while(ack0 )
greenroshks 6:efcbb48e0d03 67 //{
sakthipriya 4:7992ea5e41ed 68 //printf("\n\r %x \n",addr);
sakthipriya 0:58b0c597a58c 69
greenroshks 7:0d18080e16ce 70 //t2.stop(); //initiating the data transfer
greenroshks 7:0d18080e16ce 71 //wait_ms(10);
greenroshks 7:0d18080e16ce 72
sakthipriya 4:7992ea5e41ed 73 ack0 = master.read(addr|1,data,length);
greenroshks 7:0d18080e16ce 74 t2.stop();
greenroshks 7:0d18080e16ce 75 //t2.stop();
greenroshks 7:0d18080e16ce 76
sakthipriya 4:7992ea5e41ed 77 //printf("\nready to receive\n");
sakthipriya 4:7992ea5e41ed 78
greenroshks 6:efcbb48e0d03 79 //}
sakthipriya 4:7992ea5e41ed 80
sakthipriya 4:7992ea5e41ed 81 if(!ack0 )
sakthipriya 0:58b0c597a58c 82 {
sakthipriya 0:58b0c597a58c 83 printf("\n master has read %c from slave\n\r",*data);
sakthipriya 5:cb35b461fa29 84 //printf("\n \r %d %d %d %d %d\n",*data_reg,*status_reg,*c1_reg,*c2_reg,*freq_reg);
sakthipriya 0:58b0c597a58c 85 loopvariable0=false;
sakthipriya 0:58b0c597a58c 86 }
sakthipriya 0:58b0c597a58c 87 //master.stop();
greenroshks 7:0d18080e16ce 88 printf("\n%d\n\r",t2.read_us());
greenroshks 7:0d18080e16ce 89 t2.reset();
sakthipriya 0:58b0c597a58c 90 //printf("done\n\r");
sakthipriya 0:58b0c597a58c 91 //delete data;
sakthipriya 0:58b0c597a58c 92 interrupt=0;
greenroshks 6:efcbb48e0d03 93
greenroshks 6:efcbb48e0d03 94
greenroshks 6:efcbb48e0d03 95
sakthipriya 0:58b0c597a58c 96 }
sakthipriya 0:58b0c597a58c 97
sakthipriya 0:58b0c597a58c 98 void T_I2C_MASTER_FSLAVE(void const *args)
sakthipriya 0:58b0c597a58c 99 {
sakthipriya 0:58b0c597a58c 100 char data_receive;
sakthipriya 0:58b0c597a58c 101 while(1)
sakthipriya 0:58b0c597a58c 102 {
sakthipriya 0:58b0c597a58c 103 Thread::signal_wait(0x1);
sakthipriya 0:58b0c597a58c 104 FUNC_I2C_MASTER_FSLAVE(&data_receive,1);
sakthipriya 0:58b0c597a58c 105 i2c_data * i2c_data_r = i2c_data_receive.alloc();
sakthipriya 0:58b0c597a58c 106 i2c_data_r->data = data_receive;
sakthipriya 0:58b0c597a58c 107 i2c_data_r->length = 1;
sakthipriya 0:58b0c597a58c 108 i2c_data_receive.put(i2c_data_r);
sakthipriya 1:e5c939440756 109 printf("\n Data received from slave is %c\n\r",data_receive);
sakthipriya 0:58b0c597a58c 110 i2c_data_receive.free(i2c_data_r);
sakthipriya 0:58b0c597a58c 111 }
sakthipriya 0:58b0c597a58c 112 }
sakthipriya 0:58b0c597a58c 113
sakthipriya 0:58b0c597a58c 114 void FUNC_INT()
sakthipriya 0:58b0c597a58c 115 {
sakthipriya 0:58b0c597a58c 116
sakthipriya 0:58b0c597a58c 117 ptr_t_i2c->signal_set(0x1);
sakthipriya 0:58b0c597a58c 118
sakthipriya 0:58b0c597a58c 119 }
sakthipriya 0:58b0c597a58c 120
sakthipriya 1:e5c939440756 121 char *writedata = new char;
sakthipriya 1:e5c939440756 122 void FUNC_MASTER_WRITE()
sakthipriya 1:e5c939440756 123 {
sakthipriya 1:e5c939440756 124 bool write2slave=true;
sakthipriya 0:58b0c597a58c 125
sakthipriya 0:58b0c597a58c 126 interrupt = 0;
sakthipriya 1:e5c939440756 127
sakthipriya 1:e5c939440756 128 char data = pc.getc();
greenroshks 7:0d18080e16ce 129
sakthipriya 1:e5c939440756 130 i2c_data * i2c_data_s = i2c_data_send.alloc();
sakthipriya 1:e5c939440756 131 i2c_data_s->data = data;
sakthipriya 1:e5c939440756 132 i2c_data_s->length = 1;
sakthipriya 1:e5c939440756 133 i2c_data_send.put(i2c_data_s);
sakthipriya 1:e5c939440756 134 bool master_status_write = true;
greenroshks 6:efcbb48e0d03 135 interrupt = 1;
greenroshks 7:0d18080e16ce 136 t.start();
greenroshks 7:0d18080e16ce 137 //wait_ms(43); //to account for npt entering the inteupt = 1 conditin on slave due to the interruitp = 0 above
sakthipriya 1:e5c939440756 138 osEvent evt = i2c_data_send.get();
sakthipriya 1:e5c939440756 139 if (evt.status == osEventMail)
sakthipriya 1:e5c939440756 140 {
sakthipriya 1:e5c939440756 141 i2c_data *i2c_data_s = (i2c_data*)evt.value.p;
sakthipriya 1:e5c939440756 142 *writedata = i2c_data_s -> data;
sakthipriya 5:cb35b461fa29 143 //master.frequency(100000); //set clock frequency
greenroshks 7:0d18080e16ce 144 //while(write2slave)
greenroshks 7:0d18080e16ce 145 //{
greenroshks 6:efcbb48e0d03 146 printf("\nhere\n");
greenroshks 7:0d18080e16ce 147 //master.start();
greenroshks 7:0d18080e16ce 148 t.stop(); //initiating the data transfer
sakthipriya 0:58b0c597a58c 149 master_status_write = (bool) master.write(addr|0x00,writedata,1);
sakthipriya 0:58b0c597a58c 150 if(master_status_write==0)
sakthipriya 0:58b0c597a58c 151 {
sakthipriya 0:58b0c597a58c 152 printf("master has written %c to slave\n\r",*writedata);
sakthipriya 0:58b0c597a58c 153 write2slave=false;
sakthipriya 0:58b0c597a58c 154 }
greenroshks 7:0d18080e16ce 155 printf("\n%f\n",t.read());
greenroshks 7:0d18080e16ce 156 t.reset();
sakthipriya 2:e80af3c366aa 157 i2c_data_send.free(i2c_data_s);
sakthipriya 5:cb35b461fa29 158 //printf("\n \r %d %d %d %d %d\n",*data_reg,*status_reg,*c1_reg,*c2_reg,*freq_reg);
greenroshks 7:0d18080e16ce 159 //}
sakthipriya 0:58b0c597a58c 160 }
sakthipriya 1:e5c939440756 161 }
sakthipriya 1:e5c939440756 162
sakthipriya 1:e5c939440756 163
sakthipriya 1:e5c939440756 164
sakthipriya 1:e5c939440756 165 int main()
sakthipriya 1:e5c939440756 166 {
greenroshks 6:efcbb48e0d03 167
sakthipriya 4:7992ea5e41ed 168 int i= 0;
greenroshks 6:efcbb48e0d03 169 //master.start();
sakthipriya 5:cb35b461fa29 170 master.frequency(100000);
sakthipriya 1:e5c939440756 171 ptr_t_i2c = new Thread(T_I2C_MASTER_FSLAVE);
greenroshks 6:efcbb48e0d03 172
sakthipriya 1:e5c939440756 173 data_ready.rise(&FUNC_INT);
sakthipriya 1:e5c939440756 174 printf("\nstarted master\n");
sakthipriya 4:7992ea5e41ed 175 //master.start();
sakthipriya 1:e5c939440756 176 while(1)
sakthipriya 1:e5c939440756 177 {
sakthipriya 1:e5c939440756 178 FUNC_MASTER_WRITE();
sakthipriya 2:e80af3c366aa 179
sakthipriya 0:58b0c597a58c 180 }
sakthipriya 0:58b0c597a58c 181 }