X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=tos%2Fchips%2Fmsp430%2Fusci%2FHplMsp430UsciInt0P.nc;h=d802a0bf3b66e2163998866bb63580d8934ff57f;hb=a4c683fb39c46c4a0382866e7ca1ab65a524fcf4;hp=9e69649cd7701f039c4fa3e132a562e394d956bd;hpb=59a38cc43b09cc83e1a414ec0531588abab72cc9;p=tinyos-2.x.git

diff --git a/tos/chips/msp430/usci/HplMsp430UsciInt0P.nc b/tos/chips/msp430/usci/HplMsp430UsciInt0P.nc
index 9e69649c..d802a0bf 100644
--- a/tos/chips/msp430/usci/HplMsp430UsciInt0P.nc
+++ b/tos/chips/msp430/usci/HplMsp430UsciInt0P.nc
@@ -26,13 +26,13 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
- 
+
 /**
  * HPL interrupt interface for the USCI0 peripheral.
- * 
+ *
  * @author R. Steve McKown <rsmckown@gmail.com>
  */
- 
+
 #include "Msp430Usci.h"
 #include "msp430hardware.h"
 
@@ -91,7 +91,7 @@ implementation
     } else if (READ_FLAG(UCB0STAT, UCNACKIFG)) {
       CLR_FLAG(UCB0STAT, UCNACKIFG);
       CLR_FLAG(UC0IFG, UCB0TXIFG); /* Errata USCI25; 'reset' means clear? */
-      signal IntB.i2cNak();
+      signal IntB.i2cNack();
     } else if (READ_FLAG(UCB0STAT, UCSTTIFG)) {
       CLR_FLAG(UCB0STAT, UCSTTIFG);
       signal IntB.i2cStart();
@@ -100,15 +100,19 @@ implementation
       signal IntB.i2cStop();
     }
   }
-  
+
   /* This interrupt vector signals transmit events.  USCI_A0 can receive events
    * for UART and SPI modes, while USCI_B0 can receive events for I2C and SPI
    * modes.
    */
   TOSH_SIGNAL(USCIAB0TX_VECTOR) {
-    if (READ_FLAG(UC0IFG & UC0IE, UCB0RXIE))
-      signal IntB.rx(UCB0RXBUF); /* I2C receive */
-    else if (READ_FLAG(UC0IFG & UC0IE, UCA0TXIFG))
+    if (READ_FLAG(UC0IFG & UC0IE, UCB0RXIE)) {
+      /* I2C receive.  Do not read UCB0RXBUF here, as the code receiving
+       * IntB.rx() may first need to set stop and/or start bits.  The receiver
+       * must read UCB0RXBUF.
+       */
+      signal IntB.rx(0);
+    } else if (READ_FLAG(UC0IFG & UC0IE, UCA0TXIFG))
       signal IntA.tx();
     else if (READ_FLAG(UC0IFG & UC0IE, UCB0TXIFG))
       signal IntB.tx();
@@ -119,7 +123,7 @@ implementation
   default async event void IntA.tx() {}
   /* i2c is not available for A devices, so the below are never signalled */
   default async event void IntA.i2cCal() {}
-  default async event void IntA.i2cNak() {}
+  default async event void IntA.i2cNack() {}
   default async event void IntA.i2cStart() {}
   default async event void IntA.i2cStop() {}
 
@@ -128,7 +132,7 @@ implementation
   default async event void IntB.rx(uint8_t byte) {}
   default async event void IntB.tx() {}
   default async event void IntB.i2cCal() {}
-  default async event void IntB.i2cNak() {}
+  default async event void IntB.i2cNack() {}
   default async event void IntB.i2cStart() {}
   default async event void IntB.i2cStop() {}
 }