Minor improvements in I2C client:

- cleaning up clock
- pass back ACKed byte count on write

git-svn-id: https://svn.code.sf.net/p/goodfet/code/trunk@1504 12e2690d-a6be-4b82-a7b7-67c4a43b65c8

diff --git a/firmware/apps/i2c/i2c.c b/firmware/apps/i2c/i2c.c
index 1018c5f..7cc74c2 100644 (file)
--- a/firmware/apps/i2c/i2c.c
+++ b/firmware/apps/i2c/i2c.c
@@ -134,6 +134,7 @@ unsigned char I2C_ReadBit()
   SDAOUTPUT;
   I2CDELAY(1);
   I2C_CLOCK_LO();
+  I2CDELAY(1);
 
   return c;
 }
@@ -161,8 +162,9 @@ unsigned char I2C_ReadBit_Wait()
   SDAOUTPUT;
   I2CDELAY(1);
   I2C_CLOCK_LO();
+  I2CDELAY(1);
 
-  return c;
+  return c?0:1;        // return true on ACK (0)
 }
 
 //! Send a START Condition
@@ -249,15 +251,19 @@ void i2c_handle_fn( uint8_t const app,
                break;
        case WRITE:
                I2C_Start();
-               for(i=0; i<len; i++)
-                       cmddata[0]+=I2C_Write(cmddata[i]);
+               cmddata[0] = cmddata[0] << 1;
+               for(i=0; i<len; i++) {
+                       if (!I2C_Write(cmddata[i]))             //if NACK
+                               break;
+               }
                I2C_Stop();
+               cmddata[0] = i;
                txdata(app,verb,1);
                break;
        case PEEK:
                l = cmddata[0];
                I2C_Start();
-               unsigned char address = cmddata[1]<<1;
+               unsigned char address = cmddata[1] << 1;
                I2C_Write(address);
                for(i=2; i < len; i++){
                        I2C_Write(cmddata[i]);