Diff: main.cpp

Revision:

5:d622f8a4a016

Parent:

4:9e2adff677ac

Child:

6:b9578f756c9c

--- a/main.cpp	Wed Dec 16 19:42:44 2015 +0000
+++ b/main.cpp	Thu Dec 17 00:03:01 2015 +0000
@@ -1,26 +1,48 @@
 // Conv1 Slave
 #include "main.h"
 
-int main() {
+int main()
+{
     init();
     while (1) {}
 }
 
-void i2cStart(void){
+void i2cStart(void)
+{
     SDA_interrupt.disable_irq();
     char addr = (char)slave.read();
-    if (addr == RTC_ADDR) {
+    if (addr & 0x01 == 0x01) { //reading from slave
+        char uart_rec2;
+        device.putc(DATA_TO_WRITE_CHAR);
+        device.putc(addr);
+        while(1) {
+            device.putc(DATA_TO_READ_CHAR);
+            while(1) { // waiting for data byte from conv2
+                if(device.readable()) {
+                    if (device.getc() == UART_CHAR_INCOMING) {
+                        uart_rec2 = device.getc();
+                        break;
+                    }
+                }
+            }
+            if(!slave.write(uart_rec2)) {
+                device.putc(END_OF_TRANSMISSION);
+                break;
+            }
+        }
+        slave.read();
+    } else {
         count = 0;
         char uart_rec;
         device.putc(DATA_TO_WRITE_CHAR);
         device.putc(addr);
         while(!SDA_state) { //writting to slave
             buffer = (char)slave.read();
-            for(int y = 0; y < 1024; y++){} //some delay required for signal establishment
+            for(int y = 0; y < 1024; y++) {} //some delay required for signal establishment
             if(SDA_state) break;
             device.putc(DATA_TO_WRITE_CHAR);
-            device.putc(buffer); 
-            
+            device.putc(buffer);
+
             while(1) { // waiting until confirmation char is received from converter 2
                 if(device.readable()) {
                     uart_rec = device.getc();
@@ -30,41 +52,53 @@
             }
             if (uart_rec == UART_NON_CONFIRMATION_CHAR)
                 break;
-        }     
-        //slave.stop();
+        }
         device.putc(END_OF_TRANSMISSION);
-    } 
-    else if (addr & 0x01 == 0x01){ //reading from slave
-        char uart_rec2;
-        device.putc(DATA_TO_WRITE_CHAR);
-        device.putc(addr);
-        while(1){
-            device.putc(DATA_TO_READ_CHAR);
-            while(1) { // waiting for data byte from conv2 
-                if(device.readable()) {
-                    if (device.getc() == UART_CHAR_INCOMING){
-                        uart_rec2 = device.getc(); 
-                        break;
-                    }       
-                }
-            } 
-            if(!slave.write(uart_rec2)) {
-                device.putc(END_OF_TRANSMISSION);
-                break;
-            }  
-        }
-        slave.read();
-    }
-    else {
-        //pc.printf("Unknown address: %x\n\r",addr);
-        slave.stop();
     }
     SDA_interrupt.enable_irq();
 }
 
-void init(void){
+void init(void)
+{    
+    device.baud(921600);
+    SDA_interrupt.fall(&on_SDA_falling_slope_interrupt);
+}
+
+void on_SDA_falling_slope_interrupt(void)
+{
+    SDA_interrupt.disable_irq();
+    int prev_state = 1;
+    int temp_state;
+    uint8_t address = 0;
+    for (int i = 7; i >= 0; i--) //for every clock cycle in frame
+    {
+        while(1) //sample CLK line state
+        {
+            if ((temp_state = SCL_state) == prev_state) 
+                continue;
+            else
+            {
+                if (SDA_state == 1) 
+                    address |= (0x01 << i); 
+                prev_state = temp_state;
+                //device.putc((char)SDA_state);
+                break;
+            }
+        }
+    }
+    
+    // now we (probably) know the Slave address, so we can initialize i2c bus
+    // and set this Conv as Conv1 and send info to second Conv to act as Conv2
+    
+    //device.putc(SET_CONV2_FUNCT);
+    device.putc(address);
+    //init_I2C(address, 100000);
+    SDA_interrupt.enable_irq();
+}
+
+void init_I2C(char addr, int freq)
+{
     SDA_interrupt.fall(&i2cStart);
-    slave.frequency(100000);
-    device.baud(921600);
-    slave.address(RTC_ADDR);
+    slave.address(addr);
+    slave.frequency(freq);
 }
\ No newline at end of file