Device stuck detection, send 9 clocks in order to get device in start state #define WAIT_EVENT_TO(__a)\ {timeout=0xFF;\ while (__a)\ {\ timeout--;\ if(timeout==0)\ {\ break;\ }\ }\ if(timeout==0)\ {\ ETRACE1("Timeout WAIT_EVENT_TO() at "__FILE__" %d\n",__LINE__);\ break;\ }}\ static int g_i2c_CommHandle
a 2K EEPROM. The interrupt pin is replaced by the EEPROM write protect (WP). The 2 Slide 119 EEPROM has a different fixed I C address then the GPIO. The PCA9501 is a combination of the PCF8574 with a 2K
Binarydata(512) As Byte Dim Binarydatacount As Word Dim Ch As String * 1 'lowest bit is higest bit pcf8574 (pc7) Dim F7 As Bit 'bit7 pcf Dim F6 As Bit 'bit6 Dim F5 As Bit 'bit5 Dim F4 As Bit 'Bit4 Dim Cameraoff As Bit 'bit3 Dim Modemselect As Bit 'bit2 Dim Cameraaddr1 As Bit 'bit1 Dim Cameraaddr0 As
/* Code to drive HD44780 Display * via PCF8574 I2C 8bit I/O Expander * * (c) Michael "ScriptKiller" Arndt * http://scriptkiller.de/ * <scriptkiller@gmx.de> * * This program is free software; you can redistribute it and/or modify * it under the
damit low _NOP(); // kleine Pause _NOP(); // kleine Pause } int i2cwrite(int wert) { int ack; for (int a=7; a>=0; a--) { if ( (wert & (1<<a)) != 0) SDA_high(); //SDA input und damit high else SDA_low(); //SDA output und damit low pulse(); } // Abfrage Ack: Receiver zieht w ä h r e n d // der 9. high-Periode
Ethernet Data-Bus PHY 5V Address-Bus tol. Control-Bus Buffer USB-B USB Device ARM9 CPU 3..24V IR USB-A USB Host PortX tol. Transmitter Buffer SD/MMC SD / MMC Connector Port IR Receiver SD/MMC LED Connector G SPI-Bus T ² TWI-Bus 3.3V 5V tol. TWI-Bus 5V TWI J I Buffer Connector r t 4MB p e SO8 I²C Dil8 I²C PCF8574 Boot CAN 2.0b 1 n Sound 1-Wire EEPROM RTC Device Device Device FLASH Controller o Controller Controller (Option) (Option) (Option) C s u CAN e Buffer Keyboard Trans. i Supply (Option) - 1 CentiPad
low _NOP(); // kleine Pause _NOP(); // kleine Pause } int i2cwrite(uint8_t wert) { int ack; for (int a=7; a>=0; a--) { if ( (wert & (1<<a)) != 0) SDA_high(); //SDA input und damit high else SDA_low(); //SDA output und damit low pulse(); } // Abfrage Ack: Receiver zieht w ä h r e n d // der 9. high-Periode
low _NOP(); // kleine Pause _NOP(); // kleine Pause } int i2cwrite(uint8_t wert) { int ack; for (int a=7; a>=0; a--) { if ( (wert & (1<<a)) != 0) SDA_high(); //SDA input und damit high else SDA_low(); //SDA output und damit low pulse(); } // Abfrage Ack: Receiver zieht w ä h r e n d // der 9. high-Periode
ein Fehler aufgetrat). 0xA5, 0x5A, 0x01, 0x40 (Fehler bei Write an TWI-Adresse 0x40) Ob die Datenbytes bei einem TWI-Write Adressen (Register) oder Daten darstellen, das ist abhängig vom TWI-Slave. Ein Portexpander PCF8574 kennt
Ground) 8 Ground Page 104 The address that the slave device can be found upon is configurable via the A0-A2 pins. It appears at the following address: PCF8574 0 0 1 0 A2 A1 A0 PCF8574A 0 1 1 1 A2 A1 A0 The pins A0-A2 must not float. This results in the following table: A2 A1 A0 Address Address PCF8574
1 2 3 4 5 6 I2C 3.3V - Bus A SCL/1.3A SCL/3.6B A SDA/1.3A SDA/3.6B +3V3 7 6 5 3 D1 3 IC2 SC16IS750 U$2IC$1 PCF8574P BAT43 D2 + R8 13 4 BAT43 T L A /INT P0 GPIO_0 I S D 4 VDD RESET 1 1k +3V3 P1 5 GPIO_1 8 C I O S P 1 A0 P2 6 GPIO
**************** i2clcd.h - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
**************** i2clcd.c - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
**************** i2clcd.c - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
**************** i2clcd.c - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
das angeschlossene Display ansteuert. Im Gegensatz zu den verbreiteten I²C-Interfaces auf Basis des PCF8574 befindet sich die komplette Ausgabelogik auf der Senderseite. Der Sender bestimmt nicht nur den auszugebenden Text, sondern auch Cursorpositionierung, Zeilenverwaltung, Sonderzeichen und weitere
**************** i2clcd.c - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
**************** i2clcd.c - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
**************** i2clcd.c - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
**************** i2clcd.c - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
**************** i2clcd.c - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
OSC_32a z 4 C 8 C IRFR1205 OSC_32a PC14 32KHz PD1 I2C_S1 7 100mA IRFR1205 Ofen_LED2 OSC_32b PC15 A RST Q1 2C35 R72 +3V3 D D D D D R18 10K +3V3 3 I N N N N N BOOT OSC_32b +12V +12Vi K1 +12Vi G G G G G 7V_Servo
**************** i2clcd.c - LCD over I2C library Designed for HD44870 based LCDs with I2C expander PCF8574X on Atmels AVR MCUs Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
difficult. The I C port expander PCF8574 is good but I like to keep things simple and fast. This circuit allows huge cascading capability without the limits of addressing and I C routines. PCB layouts are much simpler and straightforward
Chip support +# +# CONFIG_DS1682 is not set +# CONFIG_SENSORS_EEPROM is not set +# CONFIG_SENSORS_PCF8574 is not set +# CONFIG_PCF8575 is not set +# CONFIG_SENSORS_PCF8591 is not set +# CONFIG_TPS65010 is not set +# CONFIG_SENSORS_MAX6875 is not set +# CONFIG_SENSORS_TSL2550 is not set +# CONFIG_I2C_DEBUG_CORE
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