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V 2.04 

Tested with Adafruit-like i2c backpack on standard LCD module
pull/13/head
ArjanteMarvelde 2021-12-14 14:47:06 +01:00
rodzic 6a0c78e1a0
commit bf8a944875
1 zmienionych plików z 14 dodań i 21 usunięć
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35
lcd.c
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@ -33,8 +33,8 @@
#define LCD_TYPE LCD_8574
/* I2C address */
#define I2C_LCD 0x3E
//#define I2C_LCD 0x27
//#define I2C_LCD 0x3E
#define I2C_LCD 0x27
/* HD44780 interface */
// commands
@ -106,10 +106,10 @@ uint8_t cgram[8][8] =
*/
void lcd_sendbyte(uint8_t command, uint8_t data)
{
uint8_t txdata[2];
#if LCD_TYPE == LCD_1804
uint8_t txdata[2];
// Write command/data flag and data byte
txdata[0] = (command?LCD_COMMAND:LCD_DATA);
txdata[1] = data;
@ -118,26 +118,19 @@ void lcd_sendbyte(uint8_t command, uint8_t data)
#elif LCD_TYPE == LCD_8574
uint8_t high, low;
high = (command?0:LCD2_DATA)|LCD2_ENABLE|((data&0xf0)>>1)|LCD2_BACKLIGHT;
low = (command?0:LCD2_DATA)|LCD2_ENABLE|((data&0x0f)<<3)|LCD2_BACKLIGHT;
// Write high nibble
txdata[0] = (command?0:LCD2_DATA)|LCD2_ENABLE|((data&0xf0)<<1)|LCD2_BACKLIGHT;
i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
sleep_us(LCD_DELAY);
txdata[0] &= ~LCD2_ENABLE;
i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
sleep_us(LCD_DELAY);
txdata[0] |= LCD2_ENABLE;
i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
sleep_us(LCD_DELAY);
i2c_write_blocking(i2c1, I2C_LCD, &high, 1, false); sleep_us(LCD_DELAY);
high &= ~LCD2_ENABLE;
i2c_write_blocking(i2c1, I2C_LCD, &high, 1, false); sleep_us(LCD_DELAY);
// Write low nibble
txdata[0] = (command?0:LCD2_DATA)|LCD2_ENABLE|((data&0xf0)>>3)|LCD2_BACKLIGHT;
i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
sleep_us(LCD_DELAY);
txdata[0] &= ~LCD2_ENABLE;
i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
sleep_us(LCD_DELAY);
txdata[0] |= LCD2_ENABLE;
i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
sleep_us(LCD_DELAY);
i2c_write_blocking(i2c1, I2C_LCD, &low, 1, false); sleep_us(LCD_DELAY);
low &= ~LCD2_ENABLE;
i2c_write_blocking(i2c1, I2C_LCD, &low, 1, false); sleep_us(LCD_DELAY);
#endif
}