Diff: master_i2c.cpp

Revision:

1:acf14b6dd1be

Child:

3:764ccaf29ce9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/master_i2c.cpp	Fri Aug 03 06:10:02 2012 +0000
@@ -0,0 +1,128 @@
+//master
+#include "mbed.h"
+#include <stdlib.h>
+
+I2C master(p28, p27);        // sda, scl
+Serial pc_master(USBTX, USBRX); // tx, rx
+DigitalOut success(LED1);
+DigitalOut fail(LED2);
+DigitalIn read(p29);
+
+const int SLAVEADDR = 0x88; // define the I2C Slave Address (mbed 2)
+char cmd[2];
+char buf[50];
+
+void i2c_write(char * data) {
+    int ack = master.write(SLAVEADDR, cmd, 2); // Send command string
+    if (ack)
+        fail=!fail;
+    else {
+        pc_master.printf("Master is writing..\n");
+        success=!success;
+    }
+}
+
+void i2c_read(char * buf) {
+    /*
+    int ack = master.read(SLAVEADDR, buf, 6);
+    if (ack)
+        fail=!fail;
+    else {
+        pc_master.printf("Slave sent: %s\n", buf);
+        success=!success;
+    }
+    */
+    int ack, data, scan_counter;
+    scan_counter = 0;
+    while(1)
+    {
+        data=master.read(ack);
+        if(data==0xFF)
+        {
+            pc_master.printf("Scan finish..\n");
+            break;
+        }
+        else
+        {
+            pc_master.printf("data %d reads %d\n",scan_counter++, data);
+        }
+    }
+}
+
+void i2c_test() {
+    master.start();
+    cmd[0] = 'U';
+    cmd[1] = 'S';
+    while (1) {
+        if (read) {
+            i2c_read(buf);
+        } else {
+            i2c_write(cmd);
+        }
+        wait(0.07);
+    }
+}
+
+void i2c_test2() {
+    //send signal to mbed2 and wait for response
+    master.start();
+    cmd[0] = 'C';
+    while (master.write(SLAVEADDR, cmd, 2)) {
+        fail=!fail;
+    }
+    int ack = 1;
+    while (1) {
+        if (read) {
+            while (ack) {
+                ack = master.read(SLAVEADDR, buf, 2);
+            }
+            success = 1;
+            //pc_master.printf("Slave sent: $s\n", buf);
+            break;
+        }
+    }
+}
+
+void master_write() {
+    char cmd[] = "scan";
+    while (master.write(SLAVEADDR, cmd, 4)) {
+        fail=1;
+    }
+    fail = 0;
+}
+
+void master_read() {
+    /*
+    char * data[2];
+    for (int i=0; i<2; i++) {
+        int ack = 1;
+        while (ack) {
+            ack = master.read(SLAVEADDR, data[i], 10);
+            fail = 1;
+        }
+        fail = 0;
+    }
+    pc_master.printf("master gets: %s  and %s", *(data[0]), *(data[1]));
+    */
+    pc_master.printf("master starts reading\n");
+    char data_read[64*5+1];
+    for(int i=0;i<64*5;i++)
+    {
+        data_read[i]=(char)49;
+    }
+    master.read(SLAVEADDR|1, data_read, 64*5, true);
+    for(int i=0;i<64;i++)
+    {
+      pc_master.printf("master gets: %c%c%c%c%c\n", data_read[5*i],data_read[5*i+1],data_read[5*i+2],data_read[5*i+3],data_read[5*i+4]);
+    }
+    pc_master.printf("master finishes reading\n");
+}
+
+void m2s_scan() {
+    pc_master.printf("master sends command..\n");
+    master_read();
+    master_write();
+    
+    master_read();
+    master_read();
+}
\ No newline at end of file