From a9f7889862cc229b7ceb33afca985f104013242f Mon Sep 17 00:00:00 2001
From: Wolfgang Hottgenroth <wolfgang@hottgenroth.net>
Date: Fri, 14 Oct 2016 14:52:18 +0200
Subject: [PATCH] consider start polarity of bridge

---
 src/inverter.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/src/inverter.c b/src/inverter.c
index 9cd6aba..5389006 100644
--- a/src/inverter.c
+++ b/src/inverter.c
@@ -79,13 +79,19 @@ void inverterExec() {
 		if (! running) {
 			// start
 			pulseWidthIdx = 0;
+			// bridge start polarity
+			P1OUT &= ~BIT1;
+			P1OUT |= ((BIT2 & P1IN) >> 1);
+			// start timer
 			TA0CTL = MC_1 | ID_0 | TASSEL_0 | TACLR;
 			running = true;
 		}
 	} else {
 		if (running) {
 			// stop
+			// stop timer
 			TA0CTL = MC_0;
+			// shutdown bridge
 			P2OUT &= ~BIT1;
 			running = false;
 		}
@@ -94,13 +100,16 @@ void inverterExec() {
 
 void inverterInit() {
 	// start, stop
-	P1OUT &= BIT3;
-	P1DIR &= BIT3;
+	P1OUT &= ~BIT3;
+	P1DIR &= ~BIT3;
 
-	// bridge direction
-	P1OUT &= ~BIT2;
-	P1OUT |= BIT1;
-	P1DIR |= BIT1 | BIT2;
+	// bridge start polarity
+	P1DIR &= ~BIT2;
+
+	// bridge polarity
+	P1OUT &= ~BIT1;
+	P1OUT |= ((BIT2 & P1IN) >> 1);
+	P1DIR |= BIT1;
 
 	// bridge enable (PWM)
 	P2OUT &= ~BIT1;