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hd44780_spi: added lcd support to the mightyboard (#4121) 

Signed-off-by: Marc-André Denis <marcadenis@msn.com>
This commit is contained in:
le-Bark 2021-04-07 21:07:23 -04:00 committed by GitHub
parent 165d2fc228
commit 317402d5ba
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4 changed files with 152 additions and 8 deletions
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13
config/generic-mightyboard.cfg
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@ -117,3 +117,16 @@ scl_pin: PJ5
sda_pin: PJ6
wiper: 0.50
scale: 0.773
[display]
lcd_type: hd44780_spi
spi_software_mosi_pin: PC3
spi_software_sclk_pin: PC2
#miso not used, dummy pin.
spi_software_miso_pin: PJ1
latch_pin: PC4
click_pin: ^PJ0
back_pin: ^PJ2
up_pin: ^PJ4
down_pin: ^PJ3

19
docs/Config_Reference.md
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@ -3089,7 +3089,8 @@ Support for a display attached to the micro-controller.
[display]
lcd_type:
# The type of LCD chip in use. This may be "hd44780" (which is used
# in "RepRapDiscount 2004 Smart Controller" type displays), "st7920"
# in "RepRapDiscount 2004 Smart Controller" type displays),"hd44780_spi"
# (which is used in mightyboard based printers), "st7920"
# (which is used in "RepRapDiscount 12864 Full Graphic Smart
# Controller" type displays), "emulated_st7920" (which emulate a ST7920
# display but won't work properly with the "st7920" display driver),
@ -3122,12 +3123,16 @@ lcd_type:
#spi_software_sclk_pin:
#spi_software_mosi_pin:
#spi_software_miso_pin:
# The pins connected to an emulated_st7920 type lcd. The en_pin corresponds
# to the cs_pin of the st7920 type lcd, spi_software_sclk_pin corresponds
# to sclk_pin and spi_software_mosi_pin corresponds to sid_pin. The
# spi_software_miso_pin needs to be set to an unused pin of the printer
# mainboard as the st7920 as no MISO pin but the software spi implementation
# requires this pin to be configured. The default spi_speed is 1MHz.
# The pins connected to an emulated_st7920 or hd44780_spi type lcd.
# The en_pin corresponds to the cs_pin of the st7920 type lcd,
# spi_software_sclk_pin corresponds to sclk_pin and spi_software_mosi_pin
# corresponds to sid_pin. The spi_software_miso_pin needs to be set to an
# unused pin of the printer mainboard as the st7920 as no MISO pin
# but the software spi implementation requires this pin to be configured.
# The default spi_speed is 1MHz.
#latch_pin:
# Used with the hd44780_spi type lcd, connected to the latch pin of the
# shift register.
#cs_pin:
#a0_pin:
#rst_pin:

3
klippy/extras/display/display.py
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@ -6,7 +6,7 @@
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging, os, ast
from . import hd44780, st7920, uc1701, menu
from . import hd44780, hd44780_spi, st7920, uc1701, menu
# Normal time between each screen redraw
REDRAW_TIME = 0.500
@ -17,6 +17,7 @@ LCD_chips = {
'st7920': st7920.ST7920, 'emulated_st7920': st7920.EmulatedST7920,
'hd44780': hd44780.HD44780, 'uc1701': uc1701.UC1701,
'ssd1306': uc1701.SSD1306, 'sh1106': uc1701.SH1106,
'hd44780_spi': hd44780_spi.hd44780_spi
}
# Storage of [display_template my_template] config sections

125
klippy/extras/display/hd44780_spi.py Normal file
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@ -0,0 +1,125 @@
# Support for HD44780 (20x4 text) LCD displays
#
# Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
# Copyright (C) 2018 Eric Callahan <arksine.code@gmail.com>
# Copyright (C) 2021 Marc-Andre Denis <marcadenis@msn.com>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging
from .. import bus
LINE_LENGTH_DEFAULT="20"
LINE_LENGTH_OPTIONS={"16":16, "20":20}
TextGlyphs = { 'right_arrow': '\x7e' }
class hd44780_spi:
def __init__(self, config):
self.printer = config.get_printer()
self.hd44780_protocol_init = config.getboolean('hd44780_protocol_init',
True)
# spi config
self.spi = bus.MCU_SPI_from_config(
config, 0x00, pin_option="latch_pin")
self.mcu = self.spi.get_mcu()
#self.spi.spi_send([0x01,0xa0])
self.data_mask = (1<<1)
self.command_mask = 0
self.enable_mask = (1<<3)
self.icons = {}
self.line_length = config.getchoice('line_length', LINE_LENGTH_OPTIONS,
LINE_LENGTH_DEFAULT)
# framebuffers
self.text_framebuffers = [bytearray(' '*2*self.line_length),
bytearray(' '*2*self.line_length)]
self.glyph_framebuffer = bytearray(64)
self.all_framebuffers = [
# Text framebuffers
(self.text_framebuffers[0], bytearray('~'*2*self.line_length),
0x80),
(self.text_framebuffers[1], bytearray('~'*2*self.line_length),
0xc0),
# Glyph framebuffer
(self.glyph_framebuffer, bytearray('~'*64), 0x40) ]
def send_4_bits(self, cmd, is_data, minclock):
if is_data:
mask = self.data_mask
else:
mask = self.command_mask
self.spi.spi_send([(cmd & 0xF0) | mask], minclock)
self.spi.spi_send([(cmd & 0xF0) | mask | self.enable_mask], minclock)
self.spi.spi_send([(cmd & 0xF0) | mask], minclock)
def send(self, cmds, is_data=False, minclock=0):
for data in cmds:
self.send_4_bits(data,is_data,minclock)
self.send_4_bits(data<<4,is_data,minclock)
def flush(self):
# Find all differences in the framebuffers and send them to the chip
for new_data, old_data, fb_id in self.all_framebuffers:
if new_data == old_data:
continue
# Find the position of all changed bytes in this framebuffer
diffs = [[i, 1] for i, (n, o) in enumerate(zip(new_data, old_data))
if n != o]
# Batch together changes that are close to each other
for i in range(len(diffs)-2, -1, -1):
pos, count = diffs[i]
nextpos, nextcount = diffs[i+1]
if pos + 4 >= nextpos and nextcount < 16:
diffs[i][1] = nextcount + (nextpos - pos)
del diffs[i+1]
# Transmit changes
for pos, count in diffs:
chip_pos = pos
self.send([fb_id + chip_pos])
self.send(new_data[pos:pos+count], is_data=True)
old_data[:] = new_data
def init(self):
curtime = self.printer.get_reactor().monotonic()
print_time = self.mcu.estimated_print_time(curtime)
# Program 4bit / 2-line mode and then issue 0x02 "Home" command
if self.hd44780_protocol_init:
init = [[0x33], [0x33], [0x32], [0x28, 0x28, 0x02]]
else:
init = [[0x02]]
# Reset (set positive direction ; enable display and hide cursor)
init.append([0x06, 0x0c])
for i, cmds in enumerate(init):
minclock = self.mcu.print_time_to_clock(print_time + i * .100)
self.send(cmds, minclock=minclock)
self.flush()
def write_text(self, x, y, data):
if x + len(data) > self.line_length:
data = data[:self.line_length - min(x, self.line_length)]
pos = x + ((y & 0x02) >> 1) * self.line_length
self.text_framebuffers[y & 1][pos:pos+len(data)] = data
def set_glyphs(self, glyphs):
for glyph_name, glyph_data in glyphs.items():
data = glyph_data.get('icon5x8')
if data is not None:
self.icons[glyph_name] = data
def write_glyph(self, x, y, glyph_name):
data = self.icons.get(glyph_name)
if data is not None:
slot, bits = data
self.write_text(x, y, [slot])
self.glyph_framebuffer[slot * 8:(slot + 1) * 8] = bits
return 1
char = TextGlyphs.get(glyph_name)
if char is not None:
# Draw character
self.write_text(x, y, char)
return 1
return 0
def write_graphics(self, x, y, data):
pass
def clear(self):
spaces = ' ' * 2*self.line_length
self.text_framebuffers[0][:] = spaces
self.text_framebuffers[1][:] = spaces
def get_dimensions(self):
return (self.line_length, 4)