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https://github.com/IcedRooibos/py32f0-template.git
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110 lines
3.3 KiB
C
Executable File
110 lines
3.3 KiB
C
Executable File
// Copyright 2021 IOsetting <iosetting(at)outlook.com>
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "pcf8574_lcd.h"
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ErrorStatus LCD_SendInternal(uint8_t lcd_addr, uint8_t data, uint8_t flags)
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{
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ErrorStatus status;
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for(;;)
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{
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status = BSP_I2C_IsDeviceReady(lcd_addr, 5000);
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if(status == SUCCESS)
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{
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break;
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}
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}
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uint8_t up = data & 0xF0;
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uint8_t lo = (data << 4) & 0xF0;
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uint8_t data_arr[4];
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data_arr[0] = up|flags|BACKLIGHT|PIN_EN;
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data_arr[1] = up|flags|BACKLIGHT;
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data_arr[2] = lo|flags|BACKLIGHT|PIN_EN;
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data_arr[3] = lo|flags|BACKLIGHT;
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status = BSP_I2C_MasterTransmit(lcd_addr, data_arr, sizeof(data_arr), 5000);
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LL_mDelay(LCD1602_DELAY);
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return status;
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}
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void LCD_SendCommand(uint8_t lcd_addr, uint8_t cmd)
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{
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LCD_SendInternal(lcd_addr, cmd, 0);
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}
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void LCD_SendData(uint8_t lcd_addr, uint8_t data)
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{
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LCD_SendInternal(lcd_addr, data, PIN_RS);
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}
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void LCD_SetCGRAM(uint8_t lcd_addr, uint8_t char_addr, const uint8_t *char_font)
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{
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uint8_t i = 8;
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LCD_SendCommand(lcd_addr, LCD1602_CMD_CGRAM_ADDR | (char_addr << 3));
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while(i--)
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{
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LCD_SendData(lcd_addr, *char_font++ );
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}
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LCD_SendCommand(lcd_addr, LCD1602_CMD_CGRAM_ADDR);
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}
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/**
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* Initialize LCD
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*
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* Described in HD44780 datasheet P45, procedures on 4-bit initializations,
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* - Wait for more than 40 ms after VCC rises to 2.7 V
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* - Function set (Interface is 8 bits long), Wait for more than 4.1 ms
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* - Function set (Interface is 8 bits long), Wait for more than 100 µs
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* - Function set (Interface is 8 bits long)
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* - Function set (Set interface to be 4 bits long.) Interface is 8 bits in length
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* - Function set (Interface is 4 bits long. Specify the number of display lines and character font.)
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* The number of display lines and character font cannot be changed after this point.
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*/
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void LCD_Init(uint8_t lcd_addr)
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{
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// need at least 40ms after power rises above 2.7V
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LL_mDelay(50);
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// start in 8-bit mode, 3 commands
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LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_8B_1L_5X8);
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LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_8B_1L_5X8);
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LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_8B_1L_5X8);
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// set it to 4-bit mode, interface is still 8-bit
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LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_4B_1L_5X8);
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// now interface is 4-bit, set it to 2 lines and 5x8 font
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LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_4B_2L_5X8);
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// display & cursor home
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LCD_SendCommand(lcd_addr, LCD1602_CMD_HOME);
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// display on, right shift, underline off, blink off
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LCD_SendCommand(lcd_addr, LCD1602_CMD_MODE_ON_CURSOR_BLNK);
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// move direction right
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LCD_SendCommand(lcd_addr, LCD1602_CMD_DIRECTION_RIGHT);
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// clear display (optional here)
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LCD_SendCommand(lcd_addr, LCD1602_CMD_CLEAR_DISPLAY);
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}
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void LCD_SendString(uint8_t lcd_addr, char *str)
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{
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while (*str)
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{
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LCD_SendData(lcd_addr, (uint8_t)(*str));
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str++;
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}
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} |