From 86f7ef98f388c7d418d7f2c3ce46086d3ba51eaa Mon Sep 17 00:00:00 2001
From: Wolfgang Hottgenroth <wolfgang@hottgenroth.net>
Date: Sun, 25 Sep 2016 22:47:50 +0200
Subject: [PATCH] symmetric wave

---
 src/inverter.c | 12 ++++++++----
 src/main.c     |  2 +-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/inverter.c b/src/inverter.c
index 1a4a01c..a2f57ee 100644
--- a/src/inverter.c
+++ b/src/inverter.c
@@ -46,7 +46,6 @@ volatile uint8_t activeOffset = 0;
 
 ISR(TIMER1_A0, TA1_ISR_Ovrfl) {
 	if (pulseWidthIdx == 0) {
-		P1OUT ^= (BIT1 | BIT0);
 	}
 
 	uint16_t pw = pulseWidths[pulseWidthIdx + activeOffset];
@@ -63,8 +62,11 @@ ISR(TIMER1_A0, TA1_ISR_Ovrfl) {
 
 ISR(TIMER1_A1, TA1_ISR_Comp) {
 	__disable_interrupt();
-	if (TA1IV & TA1IV_TACCR1) {
+	uint16_t taiv = TA1IV;
+	if (taiv & TA1IV_TACCR1) {
 		P2OUT &= ~BIT1;
+	} else if ((taiv && TA1IV_TACCR2) && (pulseWidthIdx == 0)) {
+		P1OUT ^= (BIT1 | BIT0);
 	}
 	__enable_interrupt();
 }
@@ -86,8 +88,10 @@ void inverterInit() {
 	TA1CTL = MC_1 | ID_0 | TASSEL_2 | TACLR;
 	TA1CCTL0 = CCIE | OUTMOD_4;
 	TA1CCTL1 = CCIE;
+	TA1CCTL2 = CCIE;
 	TA1CCR0 = 0;
 	TA1CCR1 = 0;
+	TA1CCR2 = 1;
 }
 
 void inverterSetFrequency(uint16_t f) {
@@ -97,8 +101,8 @@ void inverterSetFrequency(uint16_t f) {
 
 	uint8_t currentOffset = (activeOffset == 0) ? NUM_OF_SINE_VALUES : 0;
 	for (uint8_t i = 0; i < NUM_OF_SINE_VALUES; i++) {
-		uint16_t pw = (uint16_t)(slotLength * sineValues[i]);
-		pulseWidths[i + currentOffset] = (pw == sl) ? (pw - 25) : pw;
+		uint16_t pw = (uint16_t)(slotLength * 0.9 * sineValues[i]);
+		pulseWidths[i + currentOffset] = pw;
 	}
 
 	__disable_interrupt();
diff --git a/src/main.c b/src/main.c
index 8409b01..0b1efe8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -30,7 +30,7 @@ int main() {
 
   __enable_interrupt();
 
-  inverterSetFrequency(75);
+  inverterSetFrequency(50);
 
   while (1) {
   }