The 3Wire-HT1621B-GDC03849 is the GDC03849 LCD driver module for the ht1621b as the driver chip. The driver chip and the main CPU exchange data for the 3+CS bus communication mode.
The HT1621 is a 128-point memory image and multi-function LCD driver manufactured by HOLTEK. The software configuration features of the HT1621 make it suitable for a variety of LCD applications including LCD modules and display subsystems. There are only 4 or 5 pins for connecting the main controller to the HT1621. The HT1621 also has a power-saving command to reduce system power consumption. Please read the HT1621B Data Sheet for details.
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init(_timer = CMD_TIMER_DIS, _wdt = CMD_WDT_DIS, _scs = CMD_RC256K, _bias = CMD_B3C4, _tone = CMD_TONE4K, _irq = CMD_IRQ_DIS, _twc = CMD_F128, _mod = CMD_NORMAL)
Chip function and parameter initialization. _timer: Time base output settings
_wdt: WDT Set
_scs: System clock source setting
_bias: Bias and Com settings
_tone: Sound settings
_irq: IRQ Set
_twc: Time base/WDT clock output setting（F1～F128）
_mod: Mode setting (test mode and normal mode) -
HT1621xWrCmd(_cmd)
Send one Command。
_cmd: Command（Hex）# Send an command to turn on the LCD bias voltage (ie turn on the LCD power) to ht1621b HT1621xWrCmd(0x006) # A constant (LCDON) has been set here instead of the command value (0x006).
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HT1621xWrOneData(_addr, _htdata)
The specified address sends a single data.
_addr: Address（Hex）
_htdata:Data,1 byte.（Hex）# Display the number on the far left (1st digit) of the temperature as 2 HT1621xWrOneData(0x13, ((0x0B, 0x06)))
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HT1621xWrAllData(_addr, _htdata)
Specify the starting address to send multiple data in succession.
_addr：starting address(Hex)
_htdata：Continuous data(Hex)# The temperature value area is all shown as 2. ALLSHOW(0x00, ((0x0B, 0x06), (0x0B, 0x06), (0x0B, 0x06), (0x0B, 0x06), (0x0B, 0x06), (0x0B, 0x06)))
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ALLSHOW(_addr, _nbit)
Specify the starting address to continuously send the specified number of 1.
_addr:starting address(Hex)
_nbit:Number of data(1-32)# All display memory content, i.e., all 1 is set. ALLSHOW(0x00, 32)
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ALLCLEAR(_addr, _nbit)
Specify the starting address to continuously send the specified number of 0.
_addr: starting address(Hex)
_nbit: Number of data(1-32)# Clear all the contents of the memory, that is, set all to 0. ALLCLEAR(0x00, 32)
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LCDON()
Turn on the LCD bias generator -
LCDOFF()
Turn off the LCD bias generator. -
HTBEEP(_t)
Make the buzzer sound for the specified time.
_t:Hold time, in milliseconds.# The buzzer continues to sound for 500 milliseconds. HTBEEP(500)
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Function symbol(Flag)
Name Description FLAG_CMD command FLAG_READ Read only RAM FLAG_WRITE Write only RAM FLAG_MODIFY write and read RAM(即修改RAM)READ-MODIFY-WRITE -
LCD control
Name Description CMD_LCDON Turn on the LCD bias generator CMD_LCDOFF Turn off the LCD bias generator (default setting at power-on) -
SYS control
Name Description CMD_SYSEN Turn on the system oscillator CMD_SYSDIS Turn off the system and the LCD bias generator oscillator (default at power) -
Bias and COM settings, namely the bias voltage and COM terminal, the current parameters are selected according to the liquid crystal data file, such as 1/4DUTY, 1/3BIAL, then select "B3C4".
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1/2 bias setting
Name Description CMD_B2C2 2COM,1/2 bias CMD_B2C3 001001000 3COM,1/2 bias CMD_B2C4 4COM,1/2 bias -
1/3 bias setting
Name Description CMD_B3C2 2COM,1/3 bias CMD_B3C3 3COM,1/3 bias CMD_B3C4 4COM,1/3 bias
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Clock setting
Name Description CMD_RC256K The system clock source chip RC oscillator (default at power) CMD_EXT256K System clock source, external clock CMD_XTAL32K System clock source (crystal oscillator) -
Time base setting
Name Description CMD_TIMER_EN Time base output enable CMD_TIMER_DIS Time base output failure CMD_CLR_TIMER Time base generator clear -
WDT Set
Name Description CMD_WDT_DIS WDT overflow flag output is invalid, disable watchdog CMD_WDT_EN WDT overflow flag output is valid, enable watchdog CMD_CLR_WDT Clear WDT status -
Sound output setting
Name Description CMD_TONE2K Set the sound frequency output to 2KHz CMD_TONE4K Set the sound frequency output to 4KHz CMD_TONEON Turn on the sound output CMD_TONEOFF Turn off the sound output (default setting at power-on) -
Time base / WDT output settings
Name Description CMD_F1 Time base / WDT clock output: 1Hz
WDT timeout flag: 4sCMD_F2 Time base / WDT clock output: 2Hz
WDT timeout flag: 2sCMD_F4 Time base / WDT clock output: 4Hz
WDT timeout flag: 1sCMD_F8 Time base / WDT clock output: 8Hz
WDT timeout flag: 1/2sCMD_F16 Time base / WDT clock output: 16Hz
WDT timeout flag: 1/4sCMD_F32 Time base / WDT clock output: 32Hz
WDT timeout flag: 1/8sCMD_F64 Time base / WDT clock output: 64Hz
WDT timeout flag: 1/16sCMD_F128 Time base / WDT clock output: 128Hz
WDT timeout flag: 1/32s (default setting at power-on) -
IRQ Set
Name Description CMD_IRQ_DIS Disable IRQ output (default setting at power-on) CMD_IRQ_EN Make the IRQ output valid -
Work modle set
Name Description CMD_TEST Test mode CMD_NORMAL Normal mode (default setting at power-on)
GDC03849 is a liquid crystal screen produced by Good-Display, which is only used to display the temperature and temperature values of 3-digit integers and 2-digit decimals. For details, please read GDC03849 Data Sheet.
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viewTemp(_gdcdata)
Display temperature value in temperature display area
_gdcdata: Temperature value (floating point number)# Display temperature value 25.34。 viewTemp(25.34)
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viewRH(_gdcdata)
Display humidity value in the humidity display area
_gdcdata: Humidity value (floating point number)# Display humidity value 93.43。 viewRH(93.45)
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LCDALLSHOW()
Display all fields of the entire LCD -
LCDALLCLEAR()
Clear all fields of the LCD display -
TEMPCLEAR()
Clear temperature area (full line) all fields display -
RHCLEAR()
Clear humidity area (full line) all fields display
| Name | Description |
|---|---|
| NUMCODE_RH_HEX | Segment code encoding of a single character in the humidity zone stored in tuple mode (hex) |
| NUMCODE_TEMP_HEX | Segment code encoding of a single character in a temperature zone stored in tuple mode (hex) |
- Display temperature zone: temperature 33.05 degrees Celsius, humidity 98.34%
# The board:PYB Nano
from ht1621x import HT1621B
from gdc03849 import GDC03849
from machine import Pin
CS = Pin("A0")
RD = Pin("A1")
WR = Pin("B0")
DA = Pin("B1")
ht = HT1621B(CS, RD, WR, DA)
gdc = GDC03849(ht)
gdc.viewTemp(33.05)
gdc.viewRH(98.34)