Diff: OneWire.cpp

Revision:

6:28e60d774095

Parent:

5:45f3eb39b00c

Child:

7:a42114ac702f

--- a/OneWire.cpp	Sat Jan 07 11:20:08 2017 +0000
+++ b/OneWire.cpp	Sat Sep 09 09:10:49 2017 +0000
@@ -129,30 +129,76 @@
 // the bus to come high, if it doesn't then it is broken or shorted
 // and we return a 0;
 //
-// Returns 1 if a device asserted a presence pulse, 0 otherwise.
+// Returns ONEWIRE_OK if a device asserted a presence pulse, ONEWIRE_ERROR otherwise.
 //
-uint8_t OneWire::reset(void)
+
+
+uint8_t OneWire::init_sequence() 
 {
-   uint8_t r;
+    uint16_t retries = 20000;
+    
+    /*if( reset(false) == ONEWIRE_ERROR )
+        return ONEWIRE_ERROR;*/
+        
+    reset();
+        
+    //wire.input(); should be input coming out of reset
+    wait_us(80);
+    
+  /* uint8_t result = wire.read_bit();
+    
+    if ( result == 0 )
+    {
+        while( result == 0)
+        {
+            result = wire.read_bit();
+            
+            if (--retries == 0) {
+                return ONEWIRE_NO_RESPONSE;   
+            }
+        }
+        
+        return ONEWIRE_OK;
+    }
+    
+    return ONEWIRE_NO_RESPONSE;*/
+    
+    
+    return ONEWIRE_OK;
+}
+    
+uint8_t OneWire::reset( bool force/* = true*/ )
+{
    uint8_t retries = 125;
 
-    wire.input();
+   /*wire.input();
     // wait until the wire is high... just in case
     do {
         if (--retries == 0) {
-             return 0;
+             if( force )
+                break;
+            else
+                return ONEWIRE_ERROR;
         }
         wait_us(2);
-    } while (wire.read() != 1);
+    } while (wire.read() != 1);*/
 
     wire.output();
     wire = 0;
-    wait_us(480);
+    wait_us(500);
     wire.input();
+
     wait_us(70);
-    r = !wire.read();
-    wait_us(410);
-    return r;
+    uint8_t err = wire;     //just do the reset, use init_seq function to do more
+    
+    wait_us(240);
+    if ( wire == 0 )    {    // short circuit
+        printf("OneWire::reset SHORT_CIRCUIT\r\n");
+        return ONEWIRE_ERROR_SHORT_CIRCUIT;
+    }
+    
+    printf("OneWire::reset OK\r\n");
+    return ONEWIRE_OK;
 }
 
 //
@@ -161,7 +207,8 @@
 //
 void OneWire::write_bit(uint8_t v)
 {
-    wire.output();
+    wire.output();   
+    
     if (v & 1) {
         wire = 0;   // drive output low
         wait_us(10);
@@ -185,11 +232,11 @@
 
     wire.output();
     wire = 0;
-    //wait_us(1);
+    wait_us(2); //modified to meet ray's values
     wire.input();
-    wait_us(5);
-    r = wire.read();
-    wait_us(54);
+    wait_us(14);
+    r = wire;
+    wait_us(45);
     return r;
 }
 
@@ -202,9 +249,11 @@
 //
 void OneWire::write(uint8_t v, uint8_t power /* = 0 */) {
     uint8_t bitMask;
+    
+    printf("OneWire::write => %#x\r\n", v);
 
     for (bitMask = 0x01; bitMask; bitMask <<= 1) {
-    OneWire::write_bit( (bitMask & v)?1:0);
+        OneWire::write_bit( (bitMask & v)?1:0);
     }
     if ( !power) {
         wire.input();
@@ -212,11 +261,15 @@
 }
 
 void OneWire::write_bytes(const uint8_t *buf, uint16_t count, bool power /* = 0 */) {
-  for (uint16_t i = 0 ; i < count ; i++)
-    write(buf[i]);
-  if (!power) {
+    
+    for (uint16_t i = 0 ; i < count ; i++)
+    {
+        write(buf[i]);
+    }
+    
+    if (!power) {
         wire.input();
-  }
+    }
 }
 
 //