Diff: i2c.h

Revision:

209:63e9c8f8b5d2

Parent:

198:17200a427e71

Child:

215:6848a51af734

Child:

227:05e929bdd4dc

--- a/i2c.h	Sat Jul 02 14:25:11 2016 +0000
+++ b/i2c.h	Sat Jul 02 14:54:52 2016 +0000
@@ -7,78 +7,156 @@
 bool read_ack = false;
 const int addr_pl = 0x20<<1;  //PL address
 const int addr_bae = 0x20; ///bae address
-uint8_t rcv_isr = 0;
+//uint8_t rcv_isr = 0;
 
 int count = 0;
 
 char PL_I2C_DATA[134];//Payload i2c array
 uint8_t PL_TM_SIZE;//size of data to bev read from i2c
-
-void FCTN_I2C_WRITE_PL(char *data2,uint8_t tc_len2)
-{
-    write_ack = master.write(addr_pl|0x00,data2,tc_len2);//address to be defined in payload
-    if(write_ack == 0)
-        {gPC.printf("\n\rData sent to PL \n");}
-    if(write_ack == 1)
-    {
-        gPC.printf("\n\rdata not sent\n");
-        }
-}
+uint32_t pdirr1;
+uint32_t pdirw1;
 
-void FCTN_I2C_READ_PL(char *data,int length)
-{   
-    PYLD_I2C_GPIO = 1;
-    //t_read.start();
+void I2C_busreset()
+{
+    PORTE->PCR[1] &= 0xfffffffb;    //Enabling high slew rates for SDA and SCL lines
+    PORTE->PCR[0] &= 0xfffffffb;    //Enabling high slew rates for SDA and SCL lines
+    I2C0->C1 &= 0x7f;               //Disabling I2C module
+    SIM->SCGC4 &= 0xffffffbf;       //Disabling clock to I2C module
+    SIM->SCGC4 |= 0x00000040;       //Enabling clock to I2C module
+    I2C0->C1 |= 0x80;               //Enabling I2C module
+    PORTE->PCR[1] |= 0x00000004;    //Disabling high slew rates for SDA and SCL lines
+    PORTE->PCR[0] |= 0x00000004;    //Disabling high slew rates for SDA and SCL lines
+    Thread::wait(1);                //Wait for all I2C registers to be updates to their their values
+}
+bool FCTN_I2C_READ_PL(char *data,int length)       // Returns 0 for success
+{    
+    PL_I2C_GPIO = 1;
     read_ack = master.read(addr_pl|1,data,length);
-    //t_read.stop();
-  
-    if(read_ack == 0)
-        gPC.printf("\n\rData received from PL \n");
- if (read_ack == 1)
+    Thread::wait(1);        //as per tests Thread::wait not required on master side. But its safe to give 1ms 
+    pdirr1=PTE->PDIR;
+    uint8_t i2c_count = 0;    
+    if(read_ack == 0)   //if read_ack says success, it may or may not be successful.Hence we check SCL and SDA
+    {
+        while(((pdirr1 & 0x03000000)!=0x03000000)&& i2c_count<10)//checking SCL and SDA for time=10ms
+        {
+            Thread::wait(1);
+            pdirr1=PTE->PDIR;
+            i2c_count++;
+        }
+        if(((pdirr1 & 0x03000000)==0x03000000))//if SCL and SDA are both high
+        {    
+            gPC.printf("\n\rData received from BAE");
+        }
+        else 
+        {            
+            I2C_busreset();
+            read_ack = 1;
+        }
+    }
+    else if (read_ack == 1)
     {
-        gPC.printf("\n \r data not received \n");
+        I2C_busreset();
     }
-    PYLD_I2C_GPIO = 0;
+    PL_I2C_GPIO = 0;
+    i2c_count = 0;
+    return read_ack;
+    
 }
-
-int FCTN_I2C_READ(char *data,int length)
+bool FCTN_I2C_WRITE_PL(char *data2,uint8_t tc_len2)       // Returns 0 for success
+{
+    write_ack = master.write(addr_pl|0x00,data2,tc_len2);//address to be defined in payload    
+    Thread::wait(1);    //As per the tests Thread::wait is not required on master side but its safe to give 1ms
+    pdirw1=PTE->PDIR;
+    uint8_t i2c_count = 0;
+    if(write_ack == 0)
+    {
+        while(((pdirw1 & 0x03000000)!=0x03000000)&& i2c_count<10)
+        {
+            Thread::wait(1);
+            pdirw1=PTE->PDIR;
+            i2c_count++;
+        }
+        if(((pdirw1 & 0x03000000)==0x03000000))
+        {
+            gPC.printf("\n\r Data sent");        
+        }
+        else
+        {
+            I2C_busreset();
+            write_ack = 1;
+        }
+    }      
+    if (write_ack == 1)
+    {
+        I2C_busreset();
+    }
+    i2c_count = 0;
+    return write_ack;
+}
+bool FCTN_I2C_READ(char *data,int length)       // Returns 0 for success
 {   
     CDMS_I2C_GPIO = 1;
-    //t_read.start();
     read_ack = master.read(addr_bae|1,data,length);
-    //t_read.stop();
-  
-    if(read_ack == 0)
-        gPC.printf("\n\rData received from BAE \n");
- if (read_ack == 1)
+    Thread::wait(1);        //as per tests Thread::wait not required on master side. But its safe to give 1ms 
+    pdirr1=PTE->PDIR;
+    uint8_t i2c_count = 0;    
+    if(read_ack == 0)   //if read_ack says success, it may or may not be successful.Hence we check SCL and SDA
     {
-        gPC.printf("\n \r data not received \n");
+        while(((pdirr1 & 0x03000000)!=0x03000000)&& i2c_count<10)//checking SCL and SDA for time=10ms
+        {
+            Thread::wait(1);
+            pdirr1=PTE->PDIR;
+            i2c_count++;
+        }
+        if(((pdirr1 & 0x03000000)==0x03000000))//if SCL and SDA are both high
+        {    
+            gPC.printf("\n\rData received from BAE");
+        }
+        else 
+        {            
+            I2C_busreset();
+            read_ack = 1;
+        }
     }
-//if(read_ack == 1)
-//pc.printf("\n \r data not received \n");
-
+    else if (read_ack == 1)
+    {
+        I2C_busreset();
+    }
     CDMS_I2C_GPIO = 0;
-    //gPC.printf("\n\r %d \n",t.read_us());
-    //t.reset();
+    i2c_count = 0;
     return read_ack;
 }
 
-void FCTN_I2C_WRITE(char *data,uint8_t tc_len2)
-{
+bool FCTN_I2C_WRITE(char *data,int tc_len2)       // Returns 0 for success
+{    
     CDMS_I2C_GPIO = 1;
-    //t.start();
-    write_ack = master.write(addr_bae|0x00,data,tc_len2);
-    //t.stop();
-    //if(write_ack == 0)
-        //gPC.printf("\n\r data not sent \n");
-       
-if (write_ack == 1)
+    write_ack = master.write(addr_bae|0x00,data,tc_len2);    
+    Thread::wait(1);    //As per the tests Thread::wait is not required on master side but its safe to give 1ms
+    pdirw1=PTE->PDIR;
+    uint8_t i2c_count = 0;
+    if(write_ack == 0)
     {
-//        led2 = 1;
-        gPC.printf("\n\r data not sent \n");
-//        led2 = 0;    
+        while(((pdirw1 & 0x03000000)!=0x03000000)&& i2c_count<10)
+        {
+            Thread::wait(1);
+            pdirw1=PTE->PDIR;
+            i2c_count++;
+        }
+        if(((pdirw1 & 0x03000000)==0x03000000))
+        {
+            gPC.printf("\n\r Data sent");        
+        }
+        else
+        {
+            I2C_busreset();
+            write_ack = 1;
+        }
+    }      
+    if (write_ack == 1)
+    {
+        I2C_busreset();
     }
     CDMS_I2C_GPIO = 0;
-    //gPC.printf("\n\r %d \n",t.read_us());
-    //t.reset();
+    i2c_count = 0;
+    return write_ack;
 }
\ No newline at end of file