From 4a4ba3538cf52cc1e0238c673d4a97dbbf68c56a Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Wed, 5 Jan 2022 03:14:50 +0100
Subject: fix commands, add fade

---
 src/cmd.c     | 13 ++++++++++++-
 src/cmd.h     | 10 +++++++++-
 src/helpers.c |  4 ++--
 src/pwm.c     | 47 +++++++++++++++++++++++++++++++++++------------
 src/pwm.h     |  7 +++++--
 5 files changed, 63 insertions(+), 18 deletions(-)

diff --git a/src/cmd.c b/src/cmd.c
index 6e03c08..5d4fba6 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -20,7 +20,8 @@ const struct {
 	uint8_t argc;
 } cmd[_CMD_CNT] = {
 	{0,cmd_err,0},
-	{'p',cmd_set_pwm,3}
+	{'p',cmd_set_pwm,3},
+	{'f',cmd_fade_pwm,3}
 };
 
 void cmd_init() {
@@ -67,6 +68,9 @@ void cmd_tick(char _c) {
 	if (cmd_state.state >= _CMD_MAX_ARGC) {
 		cmd_state.cmd = 0;
 		cmd_state.argv[0] = _ERR_ARGC;
+
+		/* TODO this fixes reset on keysmashing. why? */
+		return;
 	}
 
 	cmd_state.argv[ (cmd_state.state++) - 1 ] = _c;
@@ -79,6 +83,13 @@ void cmd_set_pwm(uint8_t _argv[]) {
 	pwm_set_pin(pin, duty);
 }
 
+void cmd_fade_pwm(uint8_t _argv[]) {
+	uint8_t duty = hex_to_byte((char*)&(_argv[1]));
+	uint8_t pin = _argv[0] - 48;
+
+	pwm_fade_pin(pin, duty);
+}
+
 void cmd_err( uint8_t _argv[] ) {
 	switch(_argv[0]) {
 		case _ERR_ARGC:
diff --git a/src/cmd.h b/src/cmd.h
index e85093f..e246933 100644
--- a/src/cmd.h
+++ b/src/cmd.h
@@ -13,7 +13,7 @@
 #include "pwm.h"
 #include "helpers.h"
 
-#define _CMD_CNT	2
+#define _CMD_CNT	3
 #define _CMD_MAX_ARGC	4
 
 #define _ERR_CMD	1
@@ -31,6 +31,14 @@ void cmd_tick(char _c);
  */
 void cmd_set_pwm(uint8_t _argv[]);
 
+/**
+ * argc=3
+ *
+ * 0: Pin Num
+ * 1-2: Dutycycle in HEX (00-FF)
+ */
+void cmd_fade_pwm(uint8_t _argv[]);
+
 /**
  * argc=1
  *
diff --git a/src/helpers.c b/src/helpers.c
index b8c3373..61c4bc5 100644
--- a/src/helpers.c
+++ b/src/helpers.c
@@ -7,8 +7,8 @@
 #include "helpers.h"
 
 uint8_t hex_to_byte(char c[]) {
-	uint8_t ret = hex_to_halfbyte(c[0]);
-	ret += 16 * hex_to_halfbyte(c[1]);
+	uint8_t ret = hex_to_halfbyte(c[1]);
+	ret += 16 * hex_to_halfbyte(c[0]);
 
 	return ret;
 }
diff --git a/src/pwm.c b/src/pwm.c
index 787fcae..5e8fa3f 100644
--- a/src/pwm.c
+++ b/src/pwm.c
@@ -5,47 +5,70 @@
  */
 
 #include "pwm.h"
+#include <stdint.h>
 
 uint8_t t0_ovf_cnt = 0;
 
-uint8_t pb0_thresh = 128;
+uint8_t pwm_duty[PWM_PINS];
+uint8_t pwm_target[PWM_PINS];
 
 ISR(TIMER0_OVF_vect) {
+	uint8_t i;
 	cli();
 	/*TCNT0 = (1<<7);*/ /* Hack-increase Interrupt trigger freq */
 
 	t0_ovf_cnt ++;
 
-	if ( t0_ovf_cnt >= pb0_thresh )
-		PORTB &= ~(1<<PINB0);
-	else
-		PORTB |= (1<<PINB0);
+	for( i=0; i<PWM_PINS; i++) {
+		if(t0_ovf_cnt <= pwm_duty[i])
+			PWM_PORT |= (1<<i);
+		else
+			PWM_PORT &= ~(1<<i);
+	}
 
 	sei();
 }
 
 ISR(TIMER2_OVF_vect) {
+	uint8_t i;
 	cli();
-	pb0_thresh ++;
+
+	for( i=0; i<PWM_PINS; i++) {
+		if (pwm_duty[i] < pwm_target[i])
+			pwm_duty[i]++;
+		else if (pwm_duty[i] > pwm_target[i])
+			pwm_duty[i]--;
+	}
+
 	sei();
 }
 
 void pwm_init() {
-	/* Pins */
-	DDRB |= (1<<PINB0);
+	uint8_t i;
+
+	PWM_DDR  |=  (0xff >> (8-PWM_PINS));
+	PWM_PORT &= ~(0xff >> (8-PWM_PINS));
+
+	for ( i=0; i<PWM_PINS; i++ )
+		pwm_duty[i] = pwm_target[i] = 0;
 
 	/* Enable TIMER0 with interrupt, no prescaler */
 	TCCR0 |= (1<<CS00);
 	TIMSK |= (1<<TOIE0);
 
 	/* Enable TIMER2 with interrupt, Clk divide by 1024 */
-	/*
 	TCCR2 |= (7<<CS20);
 	TIMSK |= (1<<TOIE2);
-	*/
 }
 
 void pwm_set_pin(uint8_t _pin, uint8_t _duty) {
-	if(_pin == 0)
-		pb0_thresh = _duty;
+	if(_pin < PWM_PINS) {
+		pwm_duty[_pin] = _duty;
+		pwm_target[_pin] = _duty;
+	}
+}
+
+void pwm_fade_pin(uint8_t _pin, uint8_t _duty) {
+	if(_pin < PWM_PINS)
+		pwm_target[_pin] = _duty;
 }
diff --git a/src/pwm.h b/src/pwm.h
index 822e76d..0c232a2 100644
--- a/src/pwm.h
+++ b/src/pwm.h
@@ -11,11 +11,14 @@
 #include <avr/interrupt.h>
 #include <stdint.h>
 
-extern uint8_t t0_ovf_cnt;
-extern uint8_t pb0_thresh;
+#define PWM_PINS 3
+#define PWM_DDR DDRB
+#define PWM_PORT PORTB
 
 void pwm_init();
 
 void pwm_set_pin(uint8_t _pin, uint8_t _duty);
 
+void pwm_fade_pin(uint8_t _pin, uint8_t _duty);
+
 #endif /* _PWM_H_ */
-- 
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