I have loaded the MAX7219 driver by pdwerryhouse on my ESP-07 (with 4MiB flash) and Micropython v1.20.0.
Connections are: CS => GPIO5, MOSI => GPIO2, SCLK => GPIO4.
I have used level translators (MOSFETs) to connect the 5V MAX7219 pins to the 3V ESP-07 pins.
The code is same as downloaded from the github website. I am a newbie with Micropython and ESP8266, but quite proficient with C and AVR's. So I am confident about the wiring connections.
I have used the software code as it is, except that since I am using SoftSPI, I have changed the line for import as 'from machine import Pin, SoftSPI'. Since I am not using "write_to_buffer_with_dots()" I have commented this out. All other code is same.
Please assist me in getting this display working, my further plan is to make a NTP clock using these components and pwderryhouse driver code.
#shown as README in github
`from machine import Pin, SoftSPI
import max7219_8digit
# the max7219 doesn't use the MISO, but unfortunately SoftSPI requires that
# we specify it anyway
spi = SoftSPI(baudrate=100000, polarity=0, phase=0, sck=Pin(4), mosi=Pin(2), miso=Pin(0))
spi.init(baudrate = 100000) #initialise SoftSPI
ss = Pin(5, Pin.OUT)
display = max7219_8digit.Display(spi, ss)
display.write_to_buffer('12345678')
display.display()
`
`# G:\Microcontrollers\ESP8266\uPython_libs\MAX7219_7segLEDdriver\pdwerryhouse_github\max7219_8digit.py
# Licence: GPLv3
# Copyright 2017 Paul Dwerryhouse
CHAR_MAP = {
'0': 0x7e, '1': 0x30, '2': 0x6d, '3': 0x79,
'4': 0x33, '5': 0x5b, '6': 0x5f, '7': 0x70,
'8': 0x7f, '9': 0x7b, 'a': 0x77, 'b': 0x1f,
'c': 0x4e, 'd': 0x3d, 'e': 0x4f, 'f': 0x47,
'g': 0x7b, 'h': 0x37, 'i': 0x30, 'j': 0x3c,
'k': 0x57, 'l': 0x0e, 'm': 0x54, 'n': 0x15,
'o': 0x1d, 'p': 0x67, 'q': 0x73, 'r': 0x05,
's': 0x5b, 't': 0x0f, 'u': 0x1c, 'v': 0x3e,
'w': 0x2a, 'x': 0x37, 'y': 0x3b, 'z': 0x6d,
'A': 0x77, 'B': 0x1f, 'C': 0x4e, 'D': 0x3d,
'E': 0x4f, 'F': 0x47, 'G': 0x7b, 'H': 0x37,
'I': 0x30, 'J': 0x3c, 'K': 0x57, 'L': 0x0e,
'M': 0x54, 'N': 0x15, 'O': 0x1d, 'P': 0x67,
'Q': 0x73, 'R': 0x05, 'S': 0x5b, 'T': 0x0f,
'U': 0x1c, 'V': 0x3e, 'W': 0x2a, 'X': 0x37,
'Y': 0x3b, 'Z': 0x6d, ' ': 0x00, '-': 0x01,
'\xb0': 0x63, '.': 0x80
}
REG_NO_OP = 0x00
REG_DIGIT_BASE = 0x01
REG_DECODE_MODE = 0x09
REG_INTENSITY = 0x0a
REG_SCAN_LIMIT = 0x0b
REG_SHUTDOWN = 0x0c
REG_DISPLAY_TEST = 0x0f
class Display:
def __init__(self, spi, ss, intensity=7):
self.spi = spi
self.ss = ss
self.buffer = bytearray(8)
self.intensity = intensity
self.reset()
def reset(self):
self.set_register(REG_DECODE_MODE, 0)
self.set_register(REG_INTENSITY, self.intensity)
self.set_register(REG_SCAN_LIMIT, 7)
self.set_register(REG_DISPLAY_TEST, 0)
self.set_register(REG_SHUTDOWN, 1)
def set_register(self, register, value):
self.ss.off()
self.spi.write(bytearray([register, value]))
self.ss.on()
def decode_char(self, c):
d = CHAR_MAP.get(c)
return d if d != None else ' '
def write_to_buffer(self, s):
l = len(s)
if l < 8:
s = "%-8s" % s
for i in range(0,8):
self.buffer[7-i] = self.decode_char(s[i])
# def write_to_buffer_with_dots(self, s):
#
# len_s = len(s)
#
# x = 0
# i = 0
# while i < len_s:
#
# if x >= 8:
# break
#
# elif i < (len_s - 1) and s[i+1] == '.':
# self.buffer[7-x] = self.decode_char(s[i]) | 0x80
# i += 1
# else:
# self.buffer[7-x] = self.decode_char(s[i])
#
# x += 1
# i += 1
#
# while x < 8:
# self.buffer[7-x] = self.decode_char(' ')
# x += 1
def display(self):
for i in range(0,8):
self.set_register(REG_DIGIT_BASE + i, self.buffer[i])
def set_intensity(self, i):
self.intensity = i
self.set_register(REG_INTENSITY, self.intensity)
`
I have loaded the MAX7219 driver by pdwerryhouse on my ESP-07 (with 4MiB flash) and Micropython v1.20.0. Connections are: CS => GPIO5, MOSI => GPIO2, SCLK => GPIO4.
I have used level translators (MOSFETs) to connect the 5V MAX7219 pins to the 3V ESP-07 pins. The code is same as downloaded from the github website. I am a newbie with Micropython and ESP8266, but quite proficient with C and AVR's. So I am confident about the wiring connections. I have used the software code as it is, except that since I am using SoftSPI, I have changed the line for import as 'from machine import Pin, SoftSPI'. Since I am not using "write_to_buffer_with_dots()" I have commented this out. All other code is same. Please assist me in getting this display working, my further plan is to make a NTP clock using these components and pwderryhouse driver code.