From 4dea7fe8951e7565ed3b9efe9f5532b55e8ea86b Mon Sep 17 00:00:00 2001
From: Wolfgang Hottgenroth <wolfgang@hottgenroth.net>
Date: Wed, 21 Sep 2016 17:27:22 +0200
Subject: [PATCH] not yet working

---
 src/inverter.c | 80 +++++++++++++++++++++++++++++++++++++++++++-------
 src/inverter.h |  2 +-
 src/main.c     |  2 ++
 3 files changed, 72 insertions(+), 12 deletions(-)

diff --git a/src/inverter.c b/src/inverter.c
index ee5074e..0b2ee24 100644
--- a/src/inverter.c
+++ b/src/inverter.c
@@ -13,9 +13,47 @@
 
 #include "inverter.h"
 
+#define NUM_OF_SINE_VALUES 10
+
+float sineValues[NUM_OF_SINE_VALUES] = {
+		0.3090,
+		0.5878,
+		0.8090,
+		0.9511,
+		1.0000,
+		0.9511,
+		0.8090,
+		0.5878,
+		0.3090,
+		0.0000,
+};
+
+volatile uint16_t pulseWidths[NUM_OF_SINE_VALUES * 2] = { 0,50,0,50,0,50,0,50,0,50,0,0,0,0,0,0,0,0,0,0 };
+volatile uint8_t activeOffset = 0;
+
+
+volatile uint16_t uiSlotLength = 2040;
 
 ISR(TIMER1_A0, TA1_ISR_Ovrfl) {
+	static uint16_t myUiSlotLength = 0;
+	if (myUiSlotLength != uiSlotLength) {
+		TA1CCR0 = uiSlotLength;
+		myUiSlotLength = uiSlotLength;
+	}
 
+
+	static uint8_t idx = 0;
+
+	if (idx == 0) {
+		P1OUT ^= BIT1;
+	}
+
+	TA1CCR1 = pulseWidths[idx + activeOffset];
+
+	idx++;
+	if (idx >= NUM_OF_SINE_VALUES) {
+		idx = 0;
+	}
 }
 
 //ISR(TIMER1_A1, TA1_ISR_Comp) {
@@ -25,18 +63,38 @@ ISR(TIMER1_A0, TA1_ISR_Ovrfl) {
 
 
 void inverterInit() {
-  P2OUT &= ~BIT1;
-  P2DIR |= BIT1;
-  P2SEL |= BIT1;
+	P1OUT &= ~BIT1;
+	P1DIR |= BIT1;
 
-  P2OUT &= ~BIT0;
-  P2DIR |= BIT0;
-  P2SEL |= BIT0;
+	P2OUT &= ~BIT1;
+	P2DIR |= BIT1;
+	P2SEL |= BIT1;
+
+	P2OUT &= ~BIT0;
+	P2DIR |= BIT0;
+	P2SEL |= BIT0;
 
 
-  TA1CTL = MC_1 | ID_1 | TASSEL_2 | TACLR;
-  TA1CCTL0 = CCIE | OUTMOD_4;
-  // TA1CCTL1 = OUTMOD_7;
-  TA1CCR0 = 100;
-  // TA1CCR1 = 62;
+
+
+	TA1CTL = MC_1 | ID_1 | TASSEL_2 | TACLR;
+	TA1CCTL0 = CCIE | OUTMOD_4;
+	TA1CCTL1 = OUTMOD_7;
+	TA1CCR0 = 5000;
+	TA1CCR1 = 0;
+}
+
+void inverterSetFrequency(uint16_t f) {
+	float ff = (float)f;
+	float slotLength = 100.0 / (ff * 9.8e-6 * 20);
+
+	uint8_t currentOffset = (activeOffset == 0) ? NUM_OF_SINE_VALUES : 0;
+	for (uint8_t i = 0; i < NUM_OF_SINE_VALUES; i++) {
+		pulseWidths[i + currentOffset] = (uint16_t)(slotLength * sineValues[i]);
+	}
+
+	__disable_interrupt();
+	activeOffset = currentOffset;
+	uiSlotLength = (uint16_t)slotLength;
+	__enable_interrupt();
 }
diff --git a/src/inverter.h b/src/inverter.h
index 88470fa..ac26522 100644
--- a/src/inverter.h
+++ b/src/inverter.h
@@ -11,6 +11,6 @@
 #include <stdint.h>
 
 void inverterInit();
-void inverterSetFrequency(uint8_t f);
+void inverterSetFrequency(uint16_t f);
 
 #endif /* INVERTER_H_ */
diff --git a/src/main.c b/src/main.c
index 5f1bd95..00a4b83 100644
--- a/src/main.c
+++ b/src/main.c
@@ -30,6 +30,8 @@ int main() {
 
   __enable_interrupt();
 
+  //inverterSetFrequency(100);
+
   while (1) {
   }
 }