Interpolating temperature points and displaying them works
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commit
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/bin
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[submodule "avr-st7735"]
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path = avr-st7735
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url = git@github.com:LongHairedHacker/avr-st7735.git
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AVRMCU ?= atmega8
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F_CPU ?= 16000000
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ISPPORT ?= /dev/kaboard
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VERSION = 0.1
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# ST7735 stuff
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HEADERS = avr-st7735/include/spi.h
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HEADERS += avr-st7735/include/st7735.h avr-st7735/include/st7735initcmds.h
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HEADERS += avr-st7735/include/st7735_gfx.h avr-st7735/include/st7735_font.h
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HEADERS += avr-st7735/images/logo_bw.h avr-st7735/fonts/free_sans.h
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SRC = avr-st7735/spi.c avr-st7735/st7735.c
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SRC += avr-st7735/st7735_gfx.c avr-st7735/st7735_font.c
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# Local stuff
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SRC += main.c
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TARGET = reflow-firmware
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OBJDIR = bin
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CC = avr-gcc
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OBJCOPY = avr-objcopy
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OBJDUMP = avr-objdump
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SIZE = avr-size
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SRC_TMP = $(subst ../,,$(SRC))
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OBJ = $(SRC_TMP:%.c=$(OBJDIR)/$(AVRMCU)/%.o)
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CFLAGS = -I avr-st7735/include -I avr-st7735/images -I avr-st7735/fonts
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CFLAGS += -Os -Wall -Wstrict-prototypes
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CFLAGS += -ffunction-sections -fdata-sections
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CFLAGS += -fshort-enums -fpack-struct -funsigned-char -funsigned-bitfields
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CFLAGS += -mmcu=$(AVRMCU) -DF_CPU=$(F_CPU)UL -DVERSION=$(VERSION)
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LDFLAGS = -mmcu=$(AVRMCU) -Wl,--gc-sections
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all: start $(OBJDIR)/$(AVRMCU)/$(TARGET).hex size
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@echo ":: Done !"
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start:
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@echo "Reflow Firmware $(VERSION)"
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@echo "=========================="
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@echo ":: Building for $(AVRMCU)"
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@echo ":: MCU operating frequency is $(F_CPU)Hz"
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images/logo.h : images/logo.png utils/img_convert.py
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python3 utils/img_convert.py $< $@
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images/logo_bw.h : images/logo_bw.png utils/img_convert_mono.py
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python3 utils/img_convert_mono.py $< $@
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$(OBJDIR)/$(AVRMCU)/%.o : %.c $(HEADERS) Makefile
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@mkdir -p $$(dirname $@)
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$(CC) $(CFLAGS) -c $< -o $@
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$(OBJDIR)/$(AVRMCU)/$(TARGET).elf : $(OBJ)
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$(CC) $(LDFLAGS) $+ -o $@
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$(OBJDIR)/$(AVRMCU)/$(TARGET).hex : $(OBJDIR)/$(AVRMCU)/$(TARGET).elf
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$(OBJCOPY) -O ihex $< $@
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size : $(OBJDIR)/$(AVRMCU)/$(TARGET).elf
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@echo
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@$(SIZE) --mcu=$(AVRMCU) -C $(OBJDIR)/$(AVRMCU)/$(TARGET).elf
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@echo
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clean :
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@rm -rf $(OBJDIR)
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flash : all
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avrdude -c arduino \
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-p $(AVRMCU) -P $(ISPPORT) \
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-U flash:w:$(OBJDIR)/$(AVRMCU)/$(TARGET).hex
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test : flash
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screen $(ISPPORT) 38400
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Subproject commit 3d03fa4038aea6ef89e1b17c6da0e9732284d912
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#include<avr/io.h>
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#include<util/delay.h>
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#include "spi.h"
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#include "st7735.h"
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#include "st7735_gfx.h"
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#include "st7735_font.h"
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#include "logo_bw.h"
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#include "free_sans.h"
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uint8_t profile_point_count = 5;
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uint16_t profile[5][2] = {
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{0, 22},
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{90, 150},
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{180, 180},
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{210, 210},
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{270, 180},
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};
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uint16_t interpolate_profile(uint16_t t) {
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if(t > profile[profile_point_count -1][0]) {
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return profile[profile_point_count -1][1] * 100;
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}
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uint8_t pos;
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for(pos = 0; pos < profile_point_count; pos++) {
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if(profile[pos][0] > t) {
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break;
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}
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}
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int16_t time_diff = profile[pos][0] - profile[pos - 1][0];
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int16_t tmp_diff = (profile[pos][1] - profile[pos - 1][1]) * 100;
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int16_t gradient = tmp_diff / time_diff;
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return gradient * (t - profile[pos - 1][0]) + profile[pos - 1][1] * 100;
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}
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void splash_screen(void) {
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st7735_fill_rect(0, 0, 160, 128, ST7735_COLOR_BLACK);
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st7735_draw_mono_bitmap(16, 4, &logo_bw, ST7735_COLOR_WHITE, ST7735_COLOR_BLACK);
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_delay_ms(2000);
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}
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void draw_plot_template(void) {
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st7735_fill_rect(0, 0, 160, 128, ST7735_COLOR_BLACK);
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for(uint8_t y = 28; y < 128; y += 10) {
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st7735_draw_fast_hline(0, y, 160, st7735_color(128,128,128));
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}
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for(uint8_t x = 10; x < 160; x+=10) {
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st7735_draw_fast_vline(x, 20, 128, st7735_color(128,128,128));
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}
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for(uint8_t t = 0; t < 160; t++) {
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uint16_t temp = interpolate_profile(t * 2);
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st7735_draw_pixel(t, 127 - (temp / 250), ST7735_COLOR_CYAN);
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}
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}
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int main(void) {
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spi_init();
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st7735_init();
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st7735_set_orientation(ST7735_LANDSCAPE);
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splash_screen();
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draw_plot_template();
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while(1);
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}
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