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fix: ll 1602 lcd, improve the init procedures

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This commit is contained in:
IOsetting 2023-03-04 11:38:35 +08:00
parent 103d647e7b
commit 806035f632
2 changed files with 24 additions and 1 deletions
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2
Examples/LL/I2C/PCF8574_1602LCD/bsp_i2c.c
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@ -14,6 +14,8 @@ __IO uint32_t i2cState = I2C_STATE_READY;
void BSP_I2C_Config(void)
{
LL_I2C_InitTypeDef I2C_InitStruct;
LL_I2C_DeInit(I2C1);
/*
* Clock speed:
* - standard = 100khz, if PLL is on, set system clock <= 16MHz, or I2C might not work

23
Examples/LL/I2C/PCF8574_1602LCD/pcf8574_lcd.c
View File

@ -65,9 +65,30 @@ void LCD_SetCGRAM(uint8_t lcd_addr, uint8_t char_addr, const uint8_t *char_font)
LCD_SendCommand(lcd_addr, LCD1602_CMD_CGRAM_ADDR);
}
/**
* Initialize LCD
*
* Described in HD44780 datasheet P45, procedures on 4-bit initializations,
* - Wait for more than 40 ms after VCC rises to 2.7 V
* - Function set (Interface is 8 bits long), Wait for more than 4.1 ms
* - Function set (Interface is 8 bits long), Wait for more than 100 µs
* - Function set (Interface is 8 bits long)
* - Function set (Set interface to be 4 bits long.) Interface is 8 bits in length
* - Function set (Interface is 4 bits long. Specify the number of display lines and character font.)
* The number of display lines and character font cannot be changed after this point.
*/
void LCD_Init(uint8_t lcd_addr)
{
// 4-bit mode, 2 lines, 5x8 format
// need at least 40ms after power rises above 2.7V
LL_mDelay(50);
// start in 8-bit mode, 3 commands
LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_8B_1L_5X8);
LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_8B_1L_5X8);
LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_8B_1L_5X8);
// set it to 4-bit mode, interface is still 8-bit
LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_4B_1L_5X8);
// now interface is 4-bit, set it to 2 lines and 5x8 font
LCD_SendCommand(lcd_addr, LCD1602_CMD_FUNC_4B_2L_5X8);
// display & cursor home
LCD_SendCommand(lcd_addr, LCD1602_CMD_HOME);