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otto_matrix.py
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otto_matrix.py
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#-- OttDIY Python Project, 2020
from machine import Pin, SPI
import otto_font, time
DECODEMODE = const(0x09)
INTENSITY = const(0x0a)
SCANLIMIT = const(0x0b)
SHUTDOWN = const(0x0c)
DISPLAYTEST = const(0x0f)
class OttoMatrix:
#-- initialize an LED matrix with all the pins
#-- Parameters:
#-- data: pin to use for data
#-- cs: pin to use for chip select low = selected
#-- clock: pin to use as clock
#-- num: number of leds in chain
#-- rotation: 1-4 rotation of LED
def __init__(self, data = 5, cs = 18, clock = 19, num = 1, rotation = 1):
self.spi = SPI(2, baudrate = 125000, polarity = 0, phase = 0, firstbit = SPI.MSB, sck = Pin(clock), mosi = Pin(data))
self.cs = Pin(cs, Pin.OUT)
self.cs.value(1) #start with the select high
self.num = num
if rotation > 4 or rotation <= 0:
rotation = 1
self.rotation = rotation
self.buffer = bytearray(8 * self.num)
self.charBuffer = bytearray(160)
self.setCommand(SCANLIMIT, 0x07)
self.setCommand(DECODEMODE, 0x00)
self.setCommand(SHUTDOWN, 0x01)
self.setCommand(DISPLAYTEST, 0x00)
self.clearMatrix()
self.setIntensity(0x0f)
def deinit(self):
# print("OttoMatrix del called")
self.spi.deinit()
del(self.spi)
#-- Set the intensity of the LED matrix
#-- Parameters:
#-- intensity: how bright the LEDs are
def setIntensity(self, intensity):
self.setCommand(INTENSITY, intensity)
#-- Clear all the leds and the buffers
def clearMatrix(self):
for i in range(len(self.buffer)):
self.setColumnAll(i, 0)
self.buffer[i] = 0
for i in range(len(self.charBuffer)):
self.charBuffer[i] = 0
#-- Send a command to the LED matrix
#-- Parameters:
#-- command: command number
#-- value: command value
def setCommand(self, command, value):
buf = bytearray(2)
buf[0] = command
buf[1] = value
# we must first set the CS low
self.cs.value(0)
for i in range(self.num):
self.spi.write(buf)
#we must set the CS HIGH
self.cs.value(1)
#-- Set a column to a value
#-- Parmeters:
#-- col: which column
#-- value: value to set
def setColumn(self, col, value):
n = col // 8
c = col % 8
buf = bytearray(2)
buf[0] = c + 1
buf[1] = value
self.buffer[col] = value
# we must first set the CS low
self.cs.value(0)
for i in range(self.num):
if i == n:
self.spi.write(buf)
else:
self.spi.write(b'\x00\x00')
#we must set the CS HIGH
self.cs.value(1)
#-- Set all Led matrixes column to a value
#-- Parmeters:
#-- col: which column
#-- value: value to set
def setColumnAll(self, col, value):
buf = bytearray(2)
buf[0] = col + 1
buf[1] = value
# we must first set the CS low
self.cs.value(0)
for i in range(self.num):
self.spi.write(buf)
self.buffer[col * i] = value
#we must set the CS HIGH
self.cs.value(1)
#-- Set a dot
#-- Parmeters:
#-- col: which column
#-- row: which row
#-- value: value to set
def setDot(self, col, row, value):
if value == 0:
self.buffer[col] = self.buffer[col] & ~(1 << row)
else:
self.buffer[col] = self.buffer[col] | (1 << row)
n = col // 8
c = col % 8
buf = bytearray(2)
buf[0] = c + 1
buf[1] = self.buffer[col]
# we must first set the CS low
self.cs.value(0)
for i in range(self.num):
if i == n:
self.spi.write(buf)
else:
self.spi.write(b'\x00\x00')
#we must set the CS HIGH
self.cs.value(1)
#-- take a 30 bit value and write it to a 6x5 array
#-- Parmeters:
#-- value: 30 bits if led on/off info
def writeFull(self, value):
for r in range(5):
for c in range(6):
bit = 1 & (value >> (r * 6 + c))
if self.rotation == 1:
self.setDot(6 - c, 7 - r, bit)
if self.rotation == 2:
self.setDot(1 + c, r, bit)
if self.rotation == 3:
self.setDot(r, 6 - c, bit)
if self.rotation == 4:
self.setDot(7 - r, 6 - c, bit)
#-- display a character on the LED matrix
#-- Parameters:
#-- data: character to display
#-- pos: position to display it at
#-- number: total number of characters we are displaying
#-- scrollspeed: how fast to scroll text
def sendChar(self, data, pos, number, scrollspeed):
if scrollspeed < 50:
scrollspeed = 50
if scrollspeed > 150:
scrollspeed = 150
charPos = pos * 8
try:
ch = otto_font.font_6x8[data]
except:
ch = otto_font.font_6x8['+']
self.charBuffer[0 + charPos] = 0
self.charBuffer[1 + charPos: 6 + charPos] = ch
self.charBuffer[7 + charPos] = 0
#-- this is the last character so display them
if number == (pos + 1):
for c in range(8):
value = self.charBuffer[c]
for r in range(8):
bit = 1 & (value >> r)
if self.rotation == 1:
self.setDot(c, 7 - r, bit)
if self.rotation == 2:
self.setDot(7 - c, r, bit)
if self.rotation == 3:
self.setDot(r, c, bit)
if self.rotation == 4:
self.setDot(7 - r, 7 - c, bit)
#-- show the first character for longer
time.sleep_ms(500)
for i in range((number * 8) - 1):
self.charBuffer[i] = self.charBuffer[i + 1]
for c in range(8):
bv = self.charBuffer[c + 1 + i]
for r in range(8):
bit = 1 & (bv >> r)
if self.rotation == 1:
self.setDot(c, 7 - r, bit)
if self.rotation == 2:
self.setDot(7 - c, r, bit)
if self.rotation == 3:
self.setDot(r, c, bit)
if self.rotation == 4:
self.setDot(7 - r, 7 - c, bit)
time.sleep_ms(scrollspeed)
self.clearMatrix()