From d9b9b3e71397a2da9e16cbee75c4954105237363 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Wed, 5 Jan 2022 02:18:16 +0100
Subject: p command working to change PWM

refactgored pwm code
---
 src/cmd.c     | 20 ++++++++++++++------
 src/cmd.h     | 13 +++++++++++++
 src/helpers.c | 27 +++++++++++++++++++++++++++
 src/helpers.h | 16 ++++++++++++++++
 src/main.c    | 44 +++-----------------------------------------
 src/pwm.c     | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/pwm.h     | 21 +++++++++++++++++++++
 7 files changed, 145 insertions(+), 47 deletions(-)
 create mode 100644 src/helpers.c
 create mode 100644 src/helpers.h
 create mode 100644 src/pwm.c
 create mode 100644 src/pwm.h

diff --git a/src/cmd.c b/src/cmd.c
index 43b9bfc..6e03c08 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -5,6 +5,8 @@
  */
 
 #include "cmd.h"
+#include "helpers.h"
+#include <stdint.h>
 
 struct {
 	uint8_t state;
@@ -18,7 +20,7 @@ const struct {
 	uint8_t argc;
 } cmd[_CMD_CNT] = {
 	{0,cmd_err,0},
-	{'p',cmd_set_pwm,2}
+	{'p',cmd_set_pwm,3}
 };
 
 void cmd_init() {
@@ -31,18 +33,22 @@ void cmd_tick(char _c) {
 
 	if(_c == '\r') {
 		/* if cmd is not cmd_err and argc do not match */
-		if( cmd_state.cmd && cmd[cmd_state.cmd].argc != cmd_state.state - 1 ) {
+		if( cmd_state.cmd && ( cmd[cmd_state.cmd].argc != cmd_state.state - 1 ) ) {
 			/* set cmd_err to _ERR_ARGC */
 			cmd_state.cmd = 0;
 			cmd_state.argv[0] = _ERR_ARGC;
 		}
 
 		(*cmd[cmd_state.cmd].fkt)(cmd_state.argv);
-		cmd_state.state = 0;
-		cmd_state.cmd   = 0;
+		cmd_state.state   = 0;
+		cmd_state.cmd     = 0;
+		cmd_state.argv[0] = 0;
 		return;
 	}
 
+	if(_c == '\n')
+		return;
+
 	if(!cmd_state.state) {
 		cmd_state.state = 1;
 		for( i=0; i<_CMD_CNT; i++ ) {
@@ -67,8 +73,10 @@ void cmd_tick(char _c) {
 }
 
 void cmd_set_pwm(uint8_t _argv[]) {
-	uart_putchar(_argv[0]);
-	uart_putchar(_argv[1]);
+	uint8_t duty = hex_to_byte((char*)&(_argv[1]));
+	uint8_t pin = _argv[0] - 48;
+
+	pwm_set_pin(pin, duty);
 }
 
 void cmd_err( uint8_t _argv[] ) {
diff --git a/src/cmd.h b/src/cmd.h
index c547f6e..e85093f 100644
--- a/src/cmd.h
+++ b/src/cmd.h
@@ -10,6 +10,8 @@
 #include <stdint.h>
 
 #include "uart.h"
+#include "pwm.h"
+#include "helpers.h"
 
 #define _CMD_CNT	2
 #define _CMD_MAX_ARGC	4
@@ -21,8 +23,19 @@ void cmd_init();
 
 void cmd_tick(char _c);
 
+/**
+ * argc=3
+ *
+ * 0: Pin Num
+ * 1-2: Dutycycle in HEX (00-FF)
+ */
 void cmd_set_pwm(uint8_t _argv[]);
 
+/**
+ * argc=1
+ *
+ * 0: Error type
+ */
 void cmd_err(uint8_t _argv[]);
 
 #endif
diff --git a/src/helpers.c b/src/helpers.c
new file mode 100644
index 0000000..b8c3373
--- /dev/null
+++ b/src/helpers.c
@@ -0,0 +1,27 @@
+/*
+ * src/helpers.c
+ * (c) 2022 Jonas Gunz <himself@jonasgunz.de>
+ * License: All rights reserved.
+ */
+
+#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]);
+
+	return ret;
+}
+
+uint8_t hex_to_halfbyte(char c) {
+	uint8_t ret = 0;
+
+	if ( c >= 48 && c <= 57)
+		ret = c-48;
+	else if (c >= 65 && c <= 70)
+		ret = c-55;
+	else if (c >= 97 && c <= 102)
+		ret = c-87;
+
+	return ret;
+}
diff --git a/src/helpers.h b/src/helpers.h
new file mode 100644
index 0000000..6395abc
--- /dev/null
+++ b/src/helpers.h
@@ -0,0 +1,16 @@
+/*
+ * src/helpers.h
+ * (c) 2022 Jonas Gunz <himself@jonasgunz.de>
+ * License: All rights reserved.
+ */
+
+#ifndef _HELPERS_H_
+#define _HELPERS_H_
+
+#include <stdint.h>
+
+uint8_t hex_to_byte(char c[]);
+
+uint8_t hex_to_halfbyte(char c);
+
+#endif /* _HELPERS_H_ */
diff --git a/src/main.c b/src/main.c
index 131b483..7e1939c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -10,53 +10,14 @@
 
 #include "uart.h"
 #include "cmd.h"
-
-uint8_t t0_ovf_cnt = 0;
-
-uint8_t pb0_thresh = 128;
-
-ISR(TIMER0_OVF_vect) {
-	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);
-
-	sei();
-}
-
-ISR(TIMER2_OVF_vect) {
-	cli();
-	pb0_thresh ++;
-	sei();
-}
+#include "pwm.h"
 
 int main(void) {
-	char c;
-
 	cli();
 
-	/* Pins */
-	DDRB |= (1<<PINB0);
-
-	/* 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);
-	*/
-
-	/* Uart */
 	uart_init();
-
 	cmd_init();
+	pwm_init();
 	
 	/* Go! */
 	sei();
@@ -64,6 +25,7 @@ int main(void) {
 	uart_putstring("START\r\n");
 
 	while(1){
+		char c;
 		if( uart_getchar(&c) )
 			continue;
 
diff --git a/src/pwm.c b/src/pwm.c
new file mode 100644
index 0000000..787fcae
--- /dev/null
+++ b/src/pwm.c
@@ -0,0 +1,51 @@
+/*
+ * src/pwm.c
+ * (c) 2022 Jonas Gunz <himself@jonasgunz.de>
+ * License: All rights reserved.
+ */
+
+#include "pwm.h"
+
+uint8_t t0_ovf_cnt = 0;
+
+uint8_t pb0_thresh = 128;
+
+ISR(TIMER0_OVF_vect) {
+	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);
+
+	sei();
+}
+
+ISR(TIMER2_OVF_vect) {
+	cli();
+	pb0_thresh ++;
+	sei();
+}
+
+void pwm_init() {
+	/* Pins */
+	DDRB |= (1<<PINB0);
+
+	/* 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;
+}
diff --git a/src/pwm.h b/src/pwm.h
new file mode 100644
index 0000000..822e76d
--- /dev/null
+++ b/src/pwm.h
@@ -0,0 +1,21 @@
+/*
+ * src/pwm.h
+ * (c) 2022 Jonas Gunz <himself@jonasgunz.de>
+ * License: All rights reserved.
+ */
+
+#ifndef _PWM_H_
+#define _PWM_H_
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <stdint.h>
+
+extern uint8_t t0_ovf_cnt;
+extern uint8_t pb0_thresh;
+
+void pwm_init();
+
+void pwm_set_pin(uint8_t _pin, uint8_t _duty);
+
+#endif /* _PWM_H_ */
-- 
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