Merge tag 'release/2.1.1-4.5' into debian/2.1.1

[tinyos-2.x.git] / tos / chips / msp430 / usci / HplMsp430UsciInt0P.nc

diff --git a/tos/chips/msp430/usci/HplMsp430UsciInt0P.nc b/tos/chips/msp430/usci/HplMsp430UsciInt0P.nc
index dff680fd7ddb43cda8720126fc0705772c64fbf4..d802a0bf3b66e2163998866bb63580d8934ff57f 100644 (file)
--- a/tos/chips/msp430/usci/HplMsp430UsciInt0P.nc
+++ b/tos/chips/msp430/usci/HplMsp430UsciInt0P.nc
@@ -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();
@@ -106,9 +106,13 @@ implementation
    * 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() {}
 }