Commit ea5a30d9 authored by Daniel Hoffend's avatar Daniel Hoffend
Browse files

feat(ecg-app): add pause-mode

with longer 1s press on the TOP_RIGHT buttont you can pause the screen
update. You can then scroll through the increases 4s buffer with
BUTTON_LEFT and BOTTOM_RIGHT. Another press on TOP_RIGHT brings you back
into the normal mode.

The logging operation doesn't get interrupted when pausing the screen.
parent 00b4b33b
import os
import display
import utime
import buttons
import max30001
import math
import struct
WIDTH = 160
HEIGHT = 80
OFFSET = 50
ECG_RATE = 128
HISTORY_MAX = ECG_RATE * 2
DRAW_AFTER_SAMPLES = 5
SCALE_FACTOR = 30
MODE_USB = "USB"
MODE_FINGER = "Finger"
FILEBUFFERBLOCK = 4096
COLOR_BACKGROUND = [0, 0, 0]
COLOR_LINE = [255, 255, 255]
COLOR_TEXT = [255, 255, 255]
COLOR_MODE_FINGER = [0, 255, 0]
COLOR_MODE_USB = [0, 0, 255]
COLOR_WRITE_FG = [255, 255, 255]
COLOR_WRITE_BG = [255, 0, 0]
current_mode = MODE_FINGER
history = []
filebuffer = bytearray()
write = 0
bias = True
update_screen = 0
pause_screen = 0
sensor = 0
disp = display.open()
def callback_ecg(datasets):
global update_screen, history, filebuffer, write
if len(datasets) > 0:
for value in datasets:
history.append(value)
update_screen += len(datasets)
if len(history) > HISTORY_MAX:
r = len(history) - HISTORY_MAX
for i in range(r):
history.pop(0)
# buffer for writes
if write > 0:
if len(datasets) > 0:
for value in datasets:
filebuffer.extend(struct.pack("h", value))
if len(filebuffer) >= FILEBUFFERBLOCK:
write_filebuffer()
# don't update on every callback
if update_screen >= DRAW_AFTER_SAMPLES:
# print("history: %i, filebuffer: %i" % (len(history), len(filebuffer)))
draw_histogram()
update_screen = 0
def write_filebuffer():
global write, filebuffer
# write to file
chars = ""
lt = utime.localtime(write)
filename = "/ecg-%04d-%02d-%02d_%02d%02d%02d.log" % (
lt[0],
lt[1],
lt[2],
lt[3],
lt[4],
lt[5],
)
# write stuff to disk
# print("Write %i bytes to %s" % (len(filebuffer), filename))
try:
f = open(filename, "ab")
f.write(filebuffer)
f.close()
except OSError as e:
print("Please check the file or filesystem", e)
write = 0
pause_screen = -1
disp.clear(COLOR_BACKGROUND)
disp.print("IO Error", posy=0, fg=COLOR_TEXT)
disp.print("Please check", posy=20, fg=COLOR_TEXT)
disp.print("your", posy=40, fg=COLOR_TEXT)
disp.print("filesystem", posy=60, fg=COLOR_TEXT)
disp.update()
close_sensor()
except:
print("Unexpected error, stop writeing logfile")
write = 0
filebuffer = bytearray()
return
def open_sensor():
global sensor
sensor = max30001.MAX30001(
usb=(False if current_mode == MODE_FINGER else True),
bias=bias,
sample_rate=ECG_RATE,
callback=callback_ecg,
)
def close_sensor():
global sensor
sensor.close()
def toggle_mode():
global current_mode
close_sensor()
current_mode = MODE_USB if current_mode == MODE_FINGER else MODE_FINGER
open_sensor()
def toggle_bias():
global bias
close_sensor()
bias = False if bias == True else True
open_sensor()
return
def toggle_write():
global write, disp, pause_screen
pause_screen = utime.time_ms() + 1000
disp.clear(COLOR_BACKGROUND)
if write > 0:
write_filebuffer()
write = 0
disp.print("Stop", posx=50, posy=20, fg=COLOR_TEXT)
disp.print("logging", posx=30, posy=40, fg=COLOR_TEXT)
else:
filebuffer = bytearray()
write = utime.time()
disp.print("Start", posx=45, posy=20, fg=COLOR_TEXT)
disp.print("logging", posx=30, posy=40, fg=COLOR_TEXT)
disp.update()
return
def draw_histogram():
global disp, history, current_mode, bias, write, pause_screen
# skip rendering due to message beeing shown
if pause_screen == -1:
return
elif pause_screen > 0:
t = utime.time_ms()
if t > pause_screen:
pause_screen = 0
else:
return
disp.clear(COLOR_BACKGROUND)
# get max value and calc scale
value_max = 0
for value in history:
if abs(value) > value_max:
value_max = abs(value)
scale = SCALE_FACTOR / (value_max if value_max > 0 else 1)
# draw histogram
old = False
x = 0
samples = len(history)
for i, value in enumerate(history):
if old == False:
old = (x, int(value * scale) + OFFSET)
x += 1
continue
elif i > samples - WIDTH:
disp.line(old[0], old[1], x, int(value * scale) + OFFSET, col=COLOR_LINE)
old = (x, int(value * scale) + OFFSET)
x += 1
# draw text: mode/bias/write
disp.print(
current_mode + ("+Bias" if bias else ""),
posx=0,
posy=0,
fg=(COLOR_MODE_FINGER if current_mode == MODE_FINGER else COLOR_MODE_USB),
)
# announce writing ecg log
if write > 0:
t = utime.time()
if write > 0 and t % 2 == 0:
disp.print("LOG", posx=0, posy=60, fg=COLOR_WRITE_FG, bg=COLOR_WRITE_BG)
disp.update()
def main():
# show button layout
disp.clear(COLOR_BACKGROUND)
disp.print(" BUTTONS ", posx=0, posy=0, fg=COLOR_TEXT)
disp.print("Finger/USB>", posx=0, posy=20, fg=COLOR_MODE_FINGER)
disp.print(" Bias >", posx=0, posy=40, fg=COLOR_MODE_USB)
disp.print("< Write Log", posx=0, posy=60, fg=COLOR_WRITE_BG)
disp.update()
utime.sleep(3)
# start ecg
open_sensor()
while True:
button_pressed = False
while True:
v = buttons.read(
buttons.BOTTOM_LEFT | buttons.BOTTOM_RIGHT | buttons.TOP_RIGHT
)
if v == 0:
button_pressed = False
if not button_pressed and v & buttons.BOTTOM_LEFT != 0:
button_pressed = True
toggle_write()
elif not button_pressed and v & buttons.BOTTOM_RIGHT != 0:
button_pressed = True
toggle_bias()
elif not button_pressed and v & buttons.TOP_RIGHT != 0:
button_pressed = True
toggle_mode()
pass
if __name__ == "__main__":
main()
import os
import display
import utime
import buttons
import max30001
import math
import struct
WIDTH = 160
HEIGHT = 80
OFFSET_Y = 49
ECG_RATE = 128
HISTORY_MAX = ECG_RATE * 4
DRAW_AFTER_SAMPLES = 5
SCALE_FACTOR = 30
MODE_USB = "USB"
MODE_FINGER = "Finger"
FILEBUFFERBLOCK = 4096
COLOR_BACKGROUND = [0, 0, 0]
COLOR_LINE = [255, 255, 255]
COLOR_TEXT = [255, 255, 255]
COLOR_MODE_FINGER = [0, 255, 0]
COLOR_MODE_USB = [0, 0, 255]
COLOR_WRITE_FG = [255, 255, 255]
COLOR_WRITE_BG = [255, 0, 0]
current_mode = MODE_FINGER
history = []
filebuffer = bytearray()
write = 0
bias = True
update_screen = 0
pause_screen = 0
pause_histogram = False
histogram_offset = 0
sensor = 0
disp = display.open()
def callback_ecg(datasets):
global update_screen, history, filebuffer, write
update_screen += len(datasets)
# update histogram datalist
if pause_histogram == False:
if len(datasets) > 0:
for value in datasets:
history.append(value)
if len(history) > HISTORY_MAX:
r = len(history) - HISTORY_MAX
for i in range(r):
history.pop(0)
# buffer for writes
if write > 0:
if len(datasets) > 0:
for value in datasets:
filebuffer.extend(struct.pack("h", value))
if len(filebuffer) >= FILEBUFFERBLOCK:
write_filebuffer()
# don't update on every callback
if update_screen >= DRAW_AFTER_SAMPLES:
draw_histogram()
def write_filebuffer():
global write, filebuffer
# write to file
chars = ""
lt = utime.localtime(write)
filename = "/ecg-%04d-%02d-%02d_%02d%02d%02d.log" % (
lt[0],
lt[1],
lt[2],
lt[3],
lt[4],
lt[5],
)
# write stuff to disk
try:
f = open(filename, "ab")
f.write(filebuffer)
f.close()
except OSError as e:
print("Please check the file or filesystem", e)
write = 0
pause_screen = -1
disp.clear(COLOR_BACKGROUND)
disp.print("IO Error", posy=0, fg=COLOR_TEXT)
disp.print("Please check", posy=20, fg=COLOR_TEXT)
disp.print("your", posy=40, fg=COLOR_TEXT)
disp.print("filesystem", posy=60, fg=COLOR_TEXT)
disp.update()
close_sensor()
except:
print("Unexpected error, stop writeing logfile")
write = 0
filebuffer = bytearray()
return
def open_sensor():
global sensor
sensor = max30001.MAX30001(
usb=(False if current_mode == MODE_FINGER else True),
bias=bias,
sample_rate=ECG_RATE,
callback=callback_ecg,
)
def close_sensor():
global sensor
sensor.close()
def toggle_mode():
global current_mode
close_sensor()
current_mode = MODE_USB if current_mode == MODE_FINGER else MODE_FINGER
open_sensor()
def toggle_bias():
global bias
close_sensor()
bias = False if bias == True else True
open_sensor()
return
def toggle_write():
global write, disp, pause_screen
pause_screen = utime.time_ms() + 1000
disp.clear(COLOR_BACKGROUND)
if write > 0:
write_filebuffer()
write = 0
disp.print("Stop", posx=50, posy=20, fg=COLOR_TEXT)
disp.print("logging", posx=30, posy=40, fg=COLOR_TEXT)
else:
filebuffer = bytearray()
write = utime.time()
disp.print("Start", posx=45, posy=20, fg=COLOR_TEXT)
disp.print("logging", posx=30, posy=40, fg=COLOR_TEXT)
disp.update()
return
def toggle_pause():
global pause_histogram, histogram_offset, history
if pause_histogram == True:
pause_histogram = False
history = []
else:
pause_histogram = True
histogram_offset = 0
def draw_histogram():
global disp, history, current_mode, bias, write, pause_screen, update_screen
# skip rendering due to message beeing shown
if pause_screen == -1:
return
elif pause_screen > 0:
t = utime.time_ms()
if t > pause_screen:
pause_screen = 0
else:
return
disp.clear(COLOR_BACKGROUND)
# offset in pause_histogram mode
samples = len(history)
s_start = samples - (histogram_offset + (ECG_RATE * 2))
s_end = samples - (histogram_offset + 1)
s_draw = s_end - (WIDTH - 1)
# get max value and calc scale
value_max = 0
for i, value in enumerate(history):
if i >= s_start and i <= s_end and abs(value) > value_max:
value_max = abs(value)
scale = SCALE_FACTOR / (value_max if value_max > 0 else 1)
# draw histogram
old = False
x = 0
for i, value in enumerate(history):
if old == False:
old = value
x += 1
continue
elif i > s_start and i > s_draw and i < s_end:
oldy = int(old * scale)
if oldy < -SCALE_FACTOR:
oldy = -SCALE_FACTOR
elif oldy > SCALE_FACTOR:
oldy = SCALE_FACTOR
disp.line(
x - 1, oldy + OFFSET_Y, x, int(value * scale) + OFFSET_Y, col=COLOR_LINE
)
old = value
x += 1
# draw text: mode/bias/write
if pause_histogram == True:
disp.print(
"Pause"
+ (
" -%0.1fs" % (histogram_offset / ECG_RATE)
if histogram_offset > 0
else ""
),
posx=0,
posy=0,
fg=COLOR_TEXT,
)
else:
disp.print(
current_mode + ("+Bias" if bias else ""),
posx=0,
posy=0,
fg=(COLOR_MODE_FINGER if current_mode == MODE_FINGER else COLOR_MODE_USB),
)
# announce writing ecg log
if write > 0:
t = utime.time()
if write > 0 and t % 2 == 0:
disp.print("LOG", posx=0, posy=60, fg=COLOR_WRITE_FG, bg=COLOR_WRITE_BG)
disp.update()
update_screen = 0
def main():
global pause_histogram, histogram_offset
# show button layout
disp.clear(COLOR_BACKGROUND)
disp.print(" BUTTONS ", posx=0, posy=0, fg=COLOR_TEXT)
disp.print("Finger/USB>", posx=0, posy=20, fg=COLOR_MODE_FINGER)
disp.print(" Bias >", posx=0, posy=40, fg=COLOR_MODE_USB)
disp.print("< Write Log", posx=0, posy=60, fg=COLOR_WRITE_BG)
disp.update()
utime.sleep(3)
# start ecg
open_sensor()
while True:
button_pressed = {"BOTTOM_LEFT": 0, "BOTTOM_RIGHT": 0, "TOP_RIGHT": 0}
while True:
v = buttons.read(
buttons.BOTTOM_LEFT | buttons.BOTTOM_RIGHT | buttons.TOP_RIGHT
)
# BUTTOM LEFT
if button_pressed["BOTTOM_LEFT"] == 0 and v & buttons.BOTTOM_LEFT != 0:
button_pressed["BOTTOM_LEFT"] = utime.time_ms()
if pause_histogram == False:
toggle_write()
else:
l = len(history)
histogram_offset += ECG_RATE / 2
if l - histogram_offset < WIDTH:
histogram_offset = l - WIDTH
if button_pressed["BOTTOM_LEFT"] > 0 and v & buttons.BOTTOM_LEFT == 0:
duration = utime.time_ms() - button_pressed["BOTTOM_LEFT"]
button_pressed["BOTTOM_LEFT"] = 0
# BUTTOM RIGHT
if button_pressed["BOTTOM_RIGHT"] == 0 and v & buttons.BOTTOM_RIGHT != 0:
button_pressed["BOTTOM_RIGHT"] = utime.time_ms()
if pause_histogram == False:
toggle_bias()
else:
histogram_offset -= ECG_RATE / 2
histogram_offset -= histogram_offset % (ECG_RATE / 2)
if histogram_offset < 0:
histogram_offset = 0
if button_pressed["BOTTOM_RIGHT"] > 0 and v & buttons.BOTTOM_RIGHT == 0:
duration = utime.time_ms() - button_pressed["BOTTOM_RIGHT"]
button_pressed["BOTTOM_RIGHT"] = 0
# TOP RIGHT
# down, and still pressed
if button_pressed["TOP_RIGHT"] > 0 and v & buttons.TOP_RIGHT != 0:
duration = utime.time_ms() - button_pressed["TOP_RIGHT"]
if duration > 1000:
button_pressed["TOP_RIGHT"] = -1
toggle_pause()
# register down event
elif button_pressed["TOP_RIGHT"] == 0 and v & buttons.TOP_RIGHT != 0:
button_pressed["TOP_RIGHT"] = utime.time_ms()
# register up event but event already called
if button_pressed["TOP_RIGHT"] == -1 and v & buttons.TOP_RIGHT == 0:
button_pressed["TOP_RIGHT"] = 0
# register normal up event
elif button_pressed["TOP_RIGHT"] > 0 and v & buttons.TOP_RIGHT == 0:
duration = utime.time_ms() - button_pressed["TOP_RIGHT"]
button_pressed["TOP_RIGHT"] = 0
if pause_histogram == True:
toggle_pause()
else:
toggle_mode()
pass
if __name__ == "__main__":
main()
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