spi timing

displayDriver.c

@@ -33,7 +33,11 @@ void displayDriverInit() {
   UCB0CTL0 = UCMST;
   // SPI timing config
   UCB0CTL1 = UCSSEL_3;
-  UCB0BR0 = 4; // 2 would be too fast and ends up with errors
+  // Faster than 8 ends up in strange communication errors
+  // between the both MCUs.
+  // With 8 the transfer of a complete 110 pixel canvas takes
+  // about 720us.
+  UCB0BR0 = 8; 
   UCB0BR1 = 0;
 
   // BIT5: UCB0CLK