uint8_t noinline clock_rw(uint8_t read,uint8_t en)
{
uint8_t data = 0;
if (read)
{ /* Datenbyte an PCF senden, DBx high zum lesen, sollte vor EN high Flanke geschehen */
i2c_pcf8574x_set(HD44780_PCF8574_ADR, lcd_data | HD44780_PCF8574x_DBx_MASK);
/* EN setzen */
lcd_data |= _BV(HD44780_PCF8574x_EN);
/* Datenbyte an PCF senden, DBx high zum lesen, EN uebertragen */
i2c_pcf8574x_set(HD44780_PCF8574_ADR, lcd_data | HD44780_PCF8574x_DBx_MASK);
/* Datenbyte von PCF lesen, daten_nibble maskiert */
data = i2c_pcf8574x_read(HD44780_PCF8574_ADR) & HD44780_PCF8574x_DBx_MASK;
}
else
{ /* Datenbyte an PCF senden, muss vor EN high Flanke geschehen */
i2c_pcf8574x_set(HD44780_PCF8574_ADR, lcd_data);
/* EN setzen */
lcd_data |= _BV(HD44780_PCF8574x_EN);
/* Datenbyte an PCF senden, EN status uebertragen */
i2c_pcf8574x_set(HD44780_PCF8574_ADR, lcd_data);
}
/* EN loeschen */
lcd_data &= ~(_BV(HD44780_PCF8574x_EN));
/* Datenbyte erneut senden, EN status uebertragen */
i2c_pcf8574x_set(HD44780_PCF8574_ADR, lcd_data);
return data;
}
int16_t parse_cmd_i2c_pcf8574x_set(char *cmd, char *output, uint16_t len)
{
uint8_t adr;
uint8_t chip;
uint8_t value;
sscanf_P(cmd, PSTR("%u %u %x"), &adr, &chip, &value);
#ifdef ECMD_MIRROR_REQUEST
uint8_t oadr = adr;
#endif
if (chip == 0)
{
adr += I2C_SLA_PCF8574;
}
else
{
adr += I2C_SLA_PCF8574A;
}
#ifdef DEBUG_I2C
debug_printf("I2C PCF8574X IC address 0x%X, value:%X\n",adr, value);
#endif
i2c_pcf8574x_set(adr, value);
#ifdef ECMD_MIRROR_REQUEST
return ECMD_FINAL(snprintf_P(output, len, PSTR("pcf8574x set %u %u 0x%X"), oadr, chip, value));
#else
return ECMD_FINAL(snprintf_P(output, len, PSTR("0x%X"), value));
#endif
}
void noinline
hd44780_hw_init(void)
{
/* alle ausgaenge auf 0 setzen */
lcd_data = 0;
#ifdef HD44780_BACKLIGHT_INV
back_light = 1;
lcd_data |= _BV(HD44780_PCF8574x_BL);
#endif
i2c_pcf8574x_set(HD44780_PCF8574x_ADR, lcd_data);
}
void hd44780_backlight(uint8_t state)
{
back_light = state;
/* backlight status falls vorhanden uebernehmen */
if(back_light)
lcd_data |= _BV(HD44780_PCF8574x_BL);
else
lcd_data &= ~(_BV(HD44780_PCF8574x_BL));
/* backlight status direkt uebertragen */
i2c_pcf8574x_set(HD44780_PCF8574_ADR, lcd_data);
}
void noinline hd44780_hw_init(void)
{
/* alle ausgaenge auf 0 setzen */
lcd_data = 0;
i2c_pcf8574x_set(HD44780_PCF8574_ADR, lcd_data );
}
