From 02d197fdf6d6294e3aeb392f427c5acc3a0c475d Mon Sep 17 00:00:00 2001
From: Gabriel Hart
Date: Fri, 20 Aug 2021 09:48:04 -0500
Subject: from Tom E, support PB4 for any of the 3 PWM channels

---
 spaghetti-monster/fsm-main.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'spaghetti-monster/fsm-main.c')

diff --git a/spaghetti-monster/fsm-main.c b/spaghetti-monster/fsm-main.c
index f3c319c..2015563 100644
--- a/spaghetti-monster/fsm-main.c
+++ b/spaghetti-monster/fsm-main.c
@@ -46,17 +46,28 @@ static inline void hw_setup() {
     DDRB |= (1 << PWM1_PIN);
     TCCR0B = 0x01; // pre-scaler for timer (1 => 1, 2 => 8, 3 => 64...)
     TCCR0A = PHASE;
+    #if (PWM1_PIN == PB4) // Second PWM counter is ... weird
+    TCCR1 = _BV (CS10);
+    GTCCR = _BV (COM1B1) | _BV (PWM1B);
+    OCR1C = 255;  // Set ceiling value to maximum
+    #endif
     #endif
     #if PWM_CHANNELS >= 2
     DDRB |= (1 << PWM2_PIN);
+    #if (PWM2_PIN == PB4) // Second PWM counter is ... weird
+    TCCR1 = _BV (CS10);
+    GTCCR = _BV (COM1B1) | _BV (PWM1B);
+    OCR1C = 255;  // Set ceiling value to maximum
+    #endif
     #endif
     #if PWM_CHANNELS >= 3
-    // Second PWM counter is ... weird
     DDRB |= (1 << PWM3_PIN);
+    #if (PWM3_PIN == PB4) // Second PWM counter is ... weird
     TCCR1 = _BV (CS10);
     GTCCR = _BV (COM1B1) | _BV (PWM1B);
     OCR1C = 255;  // Set ceiling value to maximum
     #endif
+    #endif
     #if PWM_CHANNELS >= 4
     // 4th PWM channel is ... not actually supported in hardware  :(
     DDRB |= (1 << PWM4_PIN);
-- 
cgit v1.2.3