From d68e7f9cc2ee8b53ab6d45b1d0333d4b69948abd Mon Sep 17 00:00:00 2001
From: Julian Daube <julian.daube@breadboarder.de>
Date: Sat, 9 Feb 2019 21:33:45 +0100
Subject: [PATCH] about 80 percent there

---
 firmware/slider/CMakeLists.txt |   2 +-
 firmware/slider/adc.c          |  75 ++++++++++++++++++
 firmware/slider/adc.h          |  55 +++++++++++++
 firmware/slider/led.c          |  14 ++++
 firmware/slider/led.h          |  33 ++++++++
 firmware/slider/main.c         | 136 ++++++++++++++++-----------------
 6 files changed, 245 insertions(+), 70 deletions(-)
 create mode 100644 firmware/slider/adc.c
 create mode 100644 firmware/slider/adc.h
 create mode 100644 firmware/slider/led.c
 create mode 100644 firmware/slider/led.h

diff --git a/firmware/slider/CMakeLists.txt b/firmware/slider/CMakeLists.txt
index b3f6d58..c59228a 100644
--- a/firmware/slider/CMakeLists.txt
+++ b/firmware/slider/CMakeLists.txt
@@ -7,5 +7,5 @@ project(slider_firmware C)
 
 add_subdirectory(SliderCommunication)
 
-add_avr_executable(slider_firmware main.c)
+add_avr_executable(slider_firmware led.c main.c adc.c )
 target_link_libraries(slider_firmware DSPLAB_SliderCommunication)
diff --git a/firmware/slider/adc.c b/firmware/slider/adc.c
new file mode 100644
index 0000000..2d420b3
--- /dev/null
+++ b/firmware/slider/adc.c
@@ -0,0 +1,75 @@
+/*
+ * adc.c
+ *
+ *  Created on: 08.02.2019
+ *      Author: julian
+ */
+
+#include "adc.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#include "led.h"
+
+// global adc instance
+volatile adc_t adc;
+
+static inline void adc_next() {
+	do {
+		adc.current_channel = (adc.current_channel+1)%8;
+
+		if (!adc.current_channel) {
+			adc.current_sample = adc.buffer.ptr-1;
+
+			if (adc.interrupt)
+				adc.interrupt(&adc.buffer);
+		}
+	} while(!(adc.channel_mask & (1<<adc.current_channel)));
+
+	if (adc.current_sample < (adc.buffer.ptr + adc.buffer.size)) {
+		adc.current_sample++;
+	}
+
+	// set mux input
+	ADMUX = adc.current_channel;
+}
+
+void adc_on_done(adc_interrupt_t interrupt) {
+	adc.interrupt = interrupt;
+}
+
+/* adc driver */
+void adc_init(adc_buffer_t buffer, uint8_t mask) {
+	if (!mask) {
+		return;
+	}
+
+	adc.buffer = buffer;
+	adc.current_sample = adc.buffer.ptr;
+	adc.channel_mask = mask;
+	adc.current_channel = 0;
+
+	// find first channel
+	while(!((1<<adc.current_channel) & mask)) {
+		adc.current_channel++;
+	}
+
+	adc.interrupt = 0;
+
+	ADMUX  = 0;
+	ADCSRA = (1<<ADATE) | (1<<ADEN) ; // enable adc, maximum prescaler value
+}
+
+void adc_start() {
+	ADCSRA |= (1<<ADIE) | (1<<ADSC); // enable adc interrupt
+}
+
+void adc_stop( ){
+	ADCSRA &= ~(1<<ADIE);
+}
+
+ISR(ADC_vect) {
+	*adc.current_sample = ADC;
+	adc_next();
+}
+
diff --git a/firmware/slider/adc.h b/firmware/slider/adc.h
new file mode 100644
index 0000000..2070166
--- /dev/null
+++ b/firmware/slider/adc.h
@@ -0,0 +1,55 @@
+/*
+ * adc.h
+ *
+ *  Created on: 08.02.2019
+ *      Author: julian
+ */
+
+#ifndef ADC_H_
+#define ADC_H_
+
+#include <stdint.h>
+
+typedef uint16_t adc_sample_t;
+
+typedef struct {
+	adc_sample_t * ptr;
+	uint8_t size;
+} adc_buffer_t;
+
+typedef void (*adc_interrupt_t)(volatile adc_buffer_t * buf);
+
+typedef struct adc {
+	adc_buffer_t buffer;
+
+	uint8_t current_channel;
+	adc_sample_t * current_sample;
+	uint8_t channel_mask;
+
+	adc_interrupt_t interrupt;
+} adc_t;
+
+// the adc instance
+extern volatile adc_t adc;
+
+enum {
+	ADC_CHANNEL_0 = 0x01,
+	ADC_CHANNEL_1 = 0x02,
+	ADC_CHANNEL_2 = 0x04,
+	ADC_CHANNEL_3 = 0x08,
+	ADC_CHANNEL_4 = 0x10,
+	ADC_CHANNEL_5 = 0x20,
+	ADC_CHANNEL_6 = 0x40,
+	ADC_CHANNEL_7 = 0x80,
+	ADC_CHANNEL_ALL = 0xFF,
+};
+
+
+void adc_init(adc_buffer_t buffer, uint8_t channel_mask);
+
+void adc_on_done(adc_interrupt_t interrupt);
+
+void adc_start();
+void adc_stop();
+
+#endif /* ADC_H_ */
diff --git a/firmware/slider/led.c b/firmware/slider/led.c
new file mode 100644
index 0000000..800f6a5
--- /dev/null
+++ b/firmware/slider/led.c
@@ -0,0 +1,14 @@
+/*
+ * led.c
+ *
+ *  Created on: 09.02.2019
+ *      Author: julian
+ */
+
+
+#include "led.h"
+
+void led_init() {
+	LED_DDR |= (1<<LED_PIN);
+	led_off();
+}
diff --git a/firmware/slider/led.h b/firmware/slider/led.h
new file mode 100644
index 0000000..8a4b3a1
--- /dev/null
+++ b/firmware/slider/led.h
@@ -0,0 +1,33 @@
+/*
+ * led.h
+ *
+ *  Created on: 09.02.2019
+ *      Author: julian
+ */
+
+#ifndef LED_H_
+#define LED_H_
+
+#include <avr/io.h>
+
+/* led driver */
+#define LED_DDR DDRB
+#define LED_REG PORTB
+#define LED_PIN 0
+
+static inline void led_toggle() {
+	LED_REG ^= (1<<LED_PIN);
+}
+
+static inline void led_off() {
+	LED_REG |= (1<<LED_PIN);
+}
+
+static inline void led_on() {
+	LED_REG &= ~(1<<LED_PIN);
+}
+
+
+void led_init();
+
+#endif /* LED_H_ */
diff --git a/firmware/slider/main.c b/firmware/slider/main.c
index 3d0deb0..d91a3da 100644
--- a/firmware/slider/main.c
+++ b/firmware/slider/main.c
@@ -1,63 +1,14 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
+#include "adc.h"
+#include "led.h"
 
-/* adc driver */
-void adc_init() {
-	ADMUX = 0; // set channel, set reference to vdd
-	ADCSRA = (1<<ADEN) | // enable adc
-			(1<<ADIE); // enable adc interrupt
-}
-void adc_start() {}
-
-enum {
-	ADC_CHANNEL_1,
-	ADC_CHANNEL_2,
-	ADC_CHANNEL_3,
-	ADC_CHANNEL_4,
-	ADC_CHANNEL_5,
-	ADC_CHANNEL_6,
-	ADC_CHANNEL_7,
-	ADC_CHANNEL_COUNT
-};
-
-
-uint16_t adc_samples[ADC_CHANNEL_COUNT];
-uint8_t adc_current_sample;
-
-ISR(ADC_vect) {
-	uint16_t sample;
-	adc_samples[adc_current_sample] = sample;
-
-	adc_current_sample = (adc_current_sample+1)/ADC_CHANNEL_COUNT;
-}
-
-
-/* led driver */
-#define LED_DDR DDRA
-#define LED_REG PORTA
-#define LED_PIN 1
-
-static inline void led_toggle() {
-	LED_REG ^= (1<<LED_PIN);
-}
-
-static inline void led_off() {
-	LED_REG &= ~(1<<LED_PIN);
-}
-
-static inline void led_on() {
-	LED_REG |= (1<<LED_PIN);
-}
-
-void led_init() {
-	LED_DDR |= (1<<LED_PIN);
-	led_off();
-}
 
 /* button driver */
 // TODO: make interrupt driven
-#define BUTTON_DDR DDRA
-#define BUTTON_REG PINA
+#define BUTTON_DDR DDRB
+#define BUTTON_PORT PORTB
+#define BUTTON_REG PINB
 #define BUTTON_PIN 1
 
 enum {
@@ -67,19 +18,16 @@ enum {
 
 void button_init() {
 	led_init();
-	
+
 	BUTTON_DDR &= ~(1<<BUTTON_PIN);
+	BUTTON_PORT |= (1<<BUTTON_PIN);
+	// activate pin change interrupt
+	// PCINT9
+	PCMSK1 |= (1<<PCINT9);
+	GIMSK  |= (1<<PCIE1); // enable PCINT1
 }
 
-int button_set_state(int state) {
-	if (state == BUTTON_PRESSED) 
-		led_on();
-	else
-		led_off();
 
-	button_state = state;
-	return state;
-}
 
 int button_is_pressed() {
 	return BUTTON_REG&(1<<BUTTON_PIN);
@@ -118,6 +66,9 @@ void comm_init() {
 }
 
 void comm_start() {
+	if (!comm_iface.on_read)
+		return;
+
 	// TODO: activate USART 
 	USICR |= (1<<USIOIE);
 }
@@ -131,25 +82,72 @@ ISR(USI_OVF_vect) {
 	}
 	
 	if (comm_iface.on_read) {
-		comm_iface.on_read(&comm_iface, byte, comm_iface.callback_data);
+		comm_iface.on_read(&comm_iface, byte);
+	}
+}
+
+#include <communication.h>
+
+void on_read(iface_t * sender, byte_t b) {
+	if (!IS_EOM(b)) {
+		sender->write(sender, b);
+		return;
+	}
+
+	// strip EOM message
+	sender->write(sender, b&0x7F);
+}
+
+struct {
+	volatile message_t buffer;
+	adc_sample_t adc_buffer[5];
+} app = {};
+
+
+ISR(PCINT1_vect) {
+	if(BUTTON_REG&(1<<BUTTON_PIN)) {
+		app.buffer.button = !app.buffer.button;
+		led_toggle();
 	}
 }
 
 /* main application code */
 void init() {
-	adc_init();
 	button_init();
-	comm_init();
 
-	adc_start();
-	comm_start();
+	adc_init((adc_buffer_t){
+		.ptr  = app.adc_buffer,
+		.size = 5,
+	}, 0x8F);
 
 	// activate interrupts
 	sei();
 }
 
+void delay(uint16_t d) {
+	while(d--) {
+		__asm("nop");
+	}
+}
+
+void adc_int(volatile adc_buffer_t * buf)
+{
+	app.buffer.slider  = buf->ptr[4];
+
+	app.buffer.poti[0] = buf->ptr[3];
+	app.buffer.poti[1] = buf->ptr[2];
+	app.buffer.poti[2] = buf->ptr[0];
+	app.buffer.poti[3] = buf->ptr[1];
+}
+
 int main() {
 	init();
+	adc_on_done(adc_int);
 
-	while(1) {}
+	// start relevant perephials
+	adc_start();
+
+	while(1) {
+		delay(app.buffer.poti[0]>>4);
+	}
 }