1 files changed, 169 insertions, 0 deletions
diff --git a/src/app/forced-convection/main.cc b/src/app/forced-convection/main.cc
new file mode 100644
index 0000000..052e3fc
--- /dev/null
+++ b/src/app/forced-convection/main.cc
@@ -0,0 +1,169 @@
+/*
+ * Copyright 2026 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "arch.h"
+#include "driver/adc.h"
+#include "driver/gpio.h"
+#include "driver/stdout.h"
+#include "driver/i2c.h"
+#include "driver/soft_i2c.h"
+#include "driver/lm75.h"
+#include "driver/ssd1306.h"
+#include "lib/pixelfont/pixeloperator_mirrored.h"
+#include "object/framebuffer.h"
+
+
+#define shift_ser GPIO::d8
+#define shift_clk GPIO::d4
+#define shift_latch GPIO::d12
+#define shift_en GPIO::d7
+
+#define PWM1 OCR2A
+#define PWM2 OCR2B
+#define PWM3 OCR0A
+#define PWM4 OCR0B
+
+#define PWM1_EN _BV(5)
+#define PWM2_EN _BV(3)
+#define PWM3_EN _BV(0)
+#define PWM4_EN _BV(7)
+
+unsigned char graph[88];
+unsigned char graph_offset = 0;
+
+void loop(void)
+{
+	static int seconds = 0;
+	static int fan_speed = 0;
+	gpio.led_on(0);
+	float temp = lm75.getTemp();
+
+	if (temp < 25) {
+		PWM1 = 0;
+		PWM2 = 0;
+		PWM3 = 0;
+		PWM4 = 0;
+		TCCR0A = 0;
+		TCCR2A = 0;
+		TCCR0B = 0;
+		TCCR2B = 0;
+		fan_speed = 0;
+	}
+	else if (temp >= 30) {
+		PWM1 = 255;
+		PWM2 = 255;
+		PWM3 = 255;
+		PWM4 = 255;
+		TCCR0A = _BV(COM0A1) | _BV(COM0B1) | _BV(WGM01) | _BV(WGM00);
+		TCCR2A = _BV(COM2A1) | _BV(COM2B1) | _BV(WGM21) | _BV(WGM20);
+		TCCR0B = _BV(CS00);
+		TCCR2B = _BV(CS20);
+		fan_speed = 100;
+	}
+
+	if (seconds++ == 60) {
+		if (temp < 20) {
+			graph[graph_offset ] = 0;
+		}
+		else if (temp > 40) {
+			graph[graph_offset ] = 31;
+		}
+		else {
+			graph[graph_offset] = (temp - 20) * 1.5;
+		}
+		seconds = 0;
+		graph_offset = (graph_offset + 1) % (sizeof(graph) / sizeof(graph[0]));
+	}
+
+	uint16_t vcc = adc.getVCC_mV() - 200;
+
+	fb.clear();
+	fb.setFont(pixeloperator_mirrored);
+	fb.setPos(88, 0);
+	fb << temp << "c";
+	fb.setPos(88, 16);
+	fb << vcc/1000 << "." << (vcc%1000)/100 << (vcc%100)/10 << "V";
+	fb.setPos(88, 24);
+	fb << fan_speed << "%";
+
+	for (unsigned char i = 0; i < (sizeof(graph) / sizeof(graph[0])); i++) {
+		unsigned char column_value = graph[(graph_offset + i) % (sizeof(graph) / sizeof(graph[0]))];
+		fb.data[i*4 + 3 - (column_value/8)] = 1 << ( 7 - column_value%8);
+	}
+	ssd1306.showImage(fb.data, fb.width * fb.height / 8);
+
+	kout << "temperature_celsius: ";
+	kout.printf_float(temp);
+	kout << endl;
+	gpio.led_off(0);
+}
+
+int main(void)
+{
+	arch.setup();
+	gpio.setup();
+	kout.setup();
+
+	gpio.led_on(0);
+
+	/*
+	 * Ensure that the SSD1306 OLED display gets a clean reset / power cycle
+	 */
+
+	gpio.output(GPIO::a2, 0);
+	gpio.output(GPIO::a3, 0);
+
+	arch.delay_ms(50);
+
+	gpio.write(GPIO::a2, 1);
+	gpio.write(GPIO::a3, 0);
+
+	arch.delay_ms(50);
+
+	if (i2c.setup() != 0) {
+		kout << "I2C setup FAILED" << endl;
+		return 1;
+	}
+	kout << "I2C setup OK" << endl;
+
+	if (softi2c.setup() != 0) {
+		kout << "SoftI2C setup FAILED" << endl;
+		return 1;
+	}
+	kout << "SoftI2C setup OK" << endl;
+
+	lm75.setOS(30);
+	lm75.setHyst(25);
+	ssd1306.init();
+
+	fb.setFont(pixeloperator_mirrored);
+
+	gpio.output(shift_ser, 0);
+	gpio.output(shift_clk, 0);
+	gpio.output(shift_latch, 0);
+	gpio.output(shift_en, 0);
+
+	gpio.output(GPIO::pd3, 0); // OC2B - D3
+	gpio.output(GPIO::pd5, 0); // OC0B - D5
+	gpio.output(GPIO::pd6, 0); // OC0A - D6
+	gpio.output(GPIO::pb3, 0); // OC2A - D11
+
+	// m4a m2a m1a m1b m2b m3a m4b m3b
+	uint8_t shift_out = 0b10101001;
+
+	for (unsigned int i = 0; i < 8; i++) {
+		gpio.write(shift_ser, shift_out & (1<<i));
+		gpio.write(shift_clk, 1);
+		gpio.write(shift_clk, 0);
+	}
+	gpio.write(shift_latch, 1);
+	gpio.write(shift_latch, 0);
+
+	gpio.led_off(0);
+
+	arch.idle_loop();
+
+	return 0;
+}