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kaklik |
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/* Name: main.c |
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* Project: i2c-tiny-usb |
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* Author: Till Harbaum |
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* Tabsize: 4 |
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* Copyright: (c) 2005 by Till Harbaum <till@harbaum.org> |
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* License: GPL |
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* This Revision: $Id: main.c,v 1.9 2007/06/07 13:53:47 harbaum Exp $ |
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* |
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* $Log: main.c,v $ |
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* Revision 1.9 2007/06/07 13:53:47 harbaum |
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* Version number fixes |
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* |
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* Revision 1.8 2007/05/19 12:30:11 harbaum |
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* Updated USB stacks |
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* |
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* Revision 1.7 2007/04/22 10:34:05 harbaum |
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* *** empty log message *** |
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* |
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* Revision 1.6 2007/01/05 19:30:58 harbaum |
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* i2c clock bug fix |
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* |
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* Revision 1.5 2007/01/03 18:35:07 harbaum |
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* usbtiny fixes and pcb layouts |
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* |
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* Revision 1.4 2006/12/03 21:28:59 harbaum |
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* *** empty log message *** |
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* |
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* Revision 1.3 2006/11/22 19:12:45 harbaum |
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* Added usbtiny support |
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* |
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* Revision 1.2 2006/11/14 19:15:13 harbaum |
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* *** empty log message *** |
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* |
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*/ |
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#include <stdio.h> |
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#include <ctype.h> |
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#include <string.h> |
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#include <avr/io.h> |
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#include <avr/interrupt.h> |
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#include <avr/pgmspace.h> |
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#include <avr/wdt.h> |
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#include <util/delay.h> |
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#ifndef USBTINY |
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// use avrusb library |
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#include "usbdrv.h" |
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#include "oddebug.h" |
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#else |
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// use usbtiny library |
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#include "usb.h" |
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#include "usbtiny.h" |
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typedef byte_t uchar; |
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#if! defined (__AVR_ATtiny45__) |
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#define USBDDR DDRC |
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#define USB_CFG_IOPORT PORTC |
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#else |
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#define USBDDR DDRB |
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#define USB_CFG_IOPORT PORTB |
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#endif |
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#define USB_CFG_DMINUS_BIT USBTINY_DMINUS |
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#define USB_CFG_DPLUS_BIT USBTINY_DPLUS |
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#define usbInit() usb_init() |
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#define usbPoll() usb_poll() |
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#endif |
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#define ENABLE_SCL_EXPAND |
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/* commands from USB, must e.g. match command ids in kernel driver */ |
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#define CMD_ECHO 0 |
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#define CMD_GET_FUNC 1 |
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#define CMD_SET_DELAY 2 |
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#define CMD_GET_STATUS 3 |
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#define CMD_I2C_IO 4 |
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#define CMD_I2C_BEGIN 1 // flag fo I2C_IO |
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#define CMD_I2C_END 2 // flag fo I2C_IO |
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/* linux kernel flags */ |
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#define I2C_M_TEN 0x10 /* we have a ten bit chip address */ |
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#define I2C_M_RD 0x01 |
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#define I2C_M_NOSTART 0x4000 |
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#define I2C_M_REV_DIR_ADDR 0x2000 |
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#define I2C_M_IGNORE_NAK 0x1000 |
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#define I2C_M_NO_RD_ACK 0x0800 |
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/* To determine what functionality is present */ |
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#define I2C_FUNC_I2C 0x00000001 |
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#define I2C_FUNC_10BIT_ADDR 0x00000002 |
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#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */ |
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#define I2C_FUNC_SMBUS_HWPEC_CALC 0x00000008 /* SMBus 2.0 */ |
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#define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC 0x00000800 /* SMBus 2.0 */ |
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#define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */ |
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#define I2C_FUNC_SMBUS_PROC_CALL_PEC 0x00002000 /* SMBus 2.0 */ |
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#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */ |
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#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ |
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#define I2C_FUNC_SMBUS_QUICK 0x00010000 |
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#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 |
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#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 |
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#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 |
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#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 |
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#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 |
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#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 |
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#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 |
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#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 |
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#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 |
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#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ |
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#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ |
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#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 0x10000000 /* I2C-like block xfer */ |
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#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */ |
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#define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC 0x40000000 /* SMBus 2.0 */ |
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#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */ |
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#define I2C_FUNC_SMBUS_BYTE I2C_FUNC_SMBUS_READ_BYTE | \ |
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I2C_FUNC_SMBUS_WRITE_BYTE |
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#define I2C_FUNC_SMBUS_BYTE_DATA I2C_FUNC_SMBUS_READ_BYTE_DATA | \ |
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I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
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#define I2C_FUNC_SMBUS_WORD_DATA I2C_FUNC_SMBUS_READ_WORD_DATA | \ |
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I2C_FUNC_SMBUS_WRITE_WORD_DATA |
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#define I2C_FUNC_SMBUS_BLOCK_DATA I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ |
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I2C_FUNC_SMBUS_WRITE_BLOCK_DATA |
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#define I2C_FUNC_SMBUS_I2C_BLOCK I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ |
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I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
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#define I2C_FUNC_SMBUS_EMUL I2C_FUNC_SMBUS_QUICK | \ |
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I2C_FUNC_SMBUS_BYTE | \ |
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I2C_FUNC_SMBUS_BYTE_DATA | \ |
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I2C_FUNC_SMBUS_WORD_DATA | \ |
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I2C_FUNC_SMBUS_PROC_CALL | \ |
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I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ |
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I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC | \ |
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I2C_FUNC_SMBUS_I2C_BLOCK |
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/* the currently support capability is quite limited */ |
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const unsigned long func PROGMEM = I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
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#ifdef DEBUG |
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#define DEBUGF(format, args...) printf_P(PSTR(format), ##args) |
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/* ------------------------------------------------------------------------- */ |
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static int uart_putchar(char c, FILE *stream) { |
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if (c == '\n') |
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uart_putchar('\r', stream); |
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loop_until_bit_is_set(UCSRA, UDRE); |
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UDR = c; |
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return 0; |
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} |
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static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, |
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_FDEV_SETUP_WRITE); |
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#else |
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#define DEBUGF(format, args...) |
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#endif |
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/* ------------------------------------------------------------------------- */ |
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#define DEFAULT_DELAY 10 // default 10us (100khz) |
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static unsigned short clock_delay = DEFAULT_DELAY; |
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static unsigned short clock_delay2 = DEFAULT_DELAY/2; |
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static unsigned short expected; |
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static unsigned char saved_cmd; |
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#if! defined (__AVR_ATtiny45__) |
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#define I2C_PORT PORTC |
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#define I2C_PIN PINC |
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#define I2C_DDR DDRC |
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#define I2C_SDA _BV(4) |
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#define I2C_SCL _BV(5) |
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#else |
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#define I2C_PORT PORTB |
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#define I2C_PIN PINB |
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#define I2C_DDR DDRB |
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#define I2C_SDA _BV(1) |
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#define I2C_SCL _BV(5) |
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#endif |
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static void i2c_io_set_sda(uchar hi) { |
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if(hi) { |
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I2C_DDR &= ~I2C_SDA; // high -> input |
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I2C_PORT |= I2C_SDA; // with pullup |
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} else { |
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I2C_DDR |= I2C_SDA; // low -> output |
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I2C_PORT &= ~I2C_SDA; // drive low |
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} |
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} |
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static uchar i2c_io_get_sda(void) { |
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return(I2C_PIN & I2C_SDA); |
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} |
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static void i2c_io_set_scl(uchar hi) { |
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#ifdef ENABLE_SCL_EXPAND |
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_delay_loop_2(clock_delay2); |
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if(hi) { |
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I2C_DDR &= ~I2C_SCL; // port is input |
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I2C_PORT |= I2C_SCL; // enable pullup |
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// wait while pin is pulled low by client |
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while(!(I2C_PIN & I2C_SCL)); |
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} else { |
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I2C_DDR |= I2C_SCL; // port is output |
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I2C_PORT &= ~I2C_SCL; // drive it low |
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} |
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_delay_loop_2(clock_delay); |
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#else |
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_delay_loop_2(clock_delay2); |
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if(hi) I2C_PORT |= I2C_SCL; // port is high |
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else I2C_PORT &= ~I2C_SCL; // port is low |
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_delay_loop_2(clock_delay); |
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#endif |
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} |
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static void i2c_init(void) { |
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/* init the sda/scl pins */ |
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I2C_DDR &= ~I2C_SDA; // port is input |
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I2C_PORT |= I2C_SDA; // enable pullup |
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#ifdef ENABLE_SCL_EXPAND |
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I2C_DDR &= ~I2C_SCL; // port is input |
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I2C_PORT |= I2C_SCL; // enable pullup |
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#else |
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I2C_DDR |= I2C_SCL; // port is output |
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#endif |
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/* no bytes to be expected */ |
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expected = 0; |
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} |
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/* clock HI, delay, then LO */ |
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static void i2c_scl_toggle(void) { |
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i2c_io_set_scl(1); |
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i2c_io_set_scl(0); |
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} |
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/* i2c start condition */ |
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static void i2c_start(void) { |
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i2c_io_set_sda(0); |
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i2c_io_set_scl(0); |
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} |
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/* i2c repeated start condition */ |
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static void i2c_repstart(void) |
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{ |
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/* scl, sda may not be high */ |
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i2c_io_set_sda(1); |
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i2c_io_set_scl(1); |
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i2c_io_set_sda(0); |
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i2c_io_set_scl(0); |
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} |
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/* i2c stop condition */ |
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void i2c_stop(void) { |
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i2c_io_set_sda(0); |
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i2c_io_set_scl(1); |
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i2c_io_set_sda(1); |
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} |
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uchar i2c_put_u08(uchar b) { |
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char i; |
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for (i=7;i>=0;i--) { |
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if ( b & (1<<i) ) i2c_io_set_sda(1); |
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else i2c_io_set_sda(0); |
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i2c_scl_toggle(); // clock HI, delay, then LO |
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} |
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i2c_io_set_sda(1); // leave SDL HI |
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i2c_io_set_scl(1); // clock back up |
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b = i2c_io_get_sda(); // get the ACK bit |
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i2c_io_set_scl(0); // not really ?? |
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return(b == 0); // return ACK value |
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} |
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uchar i2c_get_u08(uchar last) { |
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char i; |
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uchar c,b = 0; |
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i2c_io_set_sda(1); // make sure pullups are activated |
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i2c_io_set_scl(0); // clock LOW |
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for(i=7;i>=0;i--) { |
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i2c_io_set_scl(1); // clock HI |
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c = i2c_io_get_sda(); |
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b <<= 1; |
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if(c) b |= 1; |
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i2c_io_set_scl(0); // clock LO |
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} |
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if(last) i2c_io_set_sda(1); // set NAK |
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else i2c_io_set_sda(0); // set ACK |
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i2c_scl_toggle(); // clock pulse |
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i2c_io_set_sda(1); // leave with SDL HI |
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return b; // return received byte |
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} |
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#ifdef DEBUG |
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void i2c_scan(void) { |
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uchar i = 0; |
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for(i=0;i<127;i++) { |
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i2c_start(); // do start transition |
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if(i2c_put_u08(i << 1)) // send DEVICE address |
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DEBUGF("I2C device at address 0x%x\n", i); |
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i2c_stop(); |
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} |
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} |
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#endif |
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/* ------------------------------------------------------------------------- */ |
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struct i2c_cmd { |
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unsigned char type; |
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unsigned char cmd; |
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unsigned short flags; |
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unsigned short addr; |
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unsigned short len; |
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}; |
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#define STATUS_IDLE 0 |
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#define STATUS_ADDRESS_ACK 1 |
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#define STATUS_ADDRESS_NAK 2 |
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static uchar status = STATUS_IDLE; |
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static uchar i2c_do(struct i2c_cmd *cmd) { |
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uchar addr; |
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DEBUGF("i2c %s at 0x%02x, len = %d\n", |
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(cmd->flags&I2C_M_RD)?"rd":"wr", cmd->addr, cmd->len); |
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/* normal 7bit address */ |
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addr = ( cmd->addr << 1 ); |
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if (cmd->flags & I2C_M_RD ) |
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addr |= 1; |
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if(cmd->cmd & CMD_I2C_BEGIN) |
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i2c_start(); |
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else |
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i2c_repstart(); |
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// send DEVICE address |
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if(!i2c_put_u08(addr)) { |
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DEBUGF("I2C read: address error @ %x\n", addr); |
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status = STATUS_ADDRESS_NAK; |
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expected = 0; |
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358 |
i2c_stop(); |
|
|
359 |
} else { |
|
|
360 |
status = STATUS_ADDRESS_ACK; |
|
|
361 |
expected = cmd->len; |
|
|
362 |
saved_cmd = cmd->cmd; |
|
|
363 |
|
|
|
364 |
/* check if transfer is already done (or failed) */ |
|
|
365 |
if((cmd->cmd & CMD_I2C_END) && !expected) |
|
|
366 |
i2c_stop(); |
|
|
367 |
} |
|
|
368 |
|
|
|
369 |
/* more data to be expected? */ |
|
|
370 |
#ifndef USBTINY |
|
|
371 |
return(cmd->len?0xff:0x00); |
|
|
372 |
#else |
|
|
373 |
return(((cmd->flags & I2C_M_RD) && cmd->len)?0xff:0x00); |
|
|
374 |
#endif |
|
|
375 |
} |
|
|
376 |
|
|
|
377 |
#ifndef USBTINY |
|
|
378 |
uchar usbFunctionSetup(uchar data[8]) { |
|
|
379 |
static uchar replyBuf[4]; |
|
|
380 |
usbMsgPtr = replyBuf; |
|
|
381 |
#else |
|
|
382 |
extern byte_t usb_setup ( byte_t data[8] ) |
|
|
383 |
{ |
|
|
384 |
byte_t *replyBuf = data; |
|
|
385 |
#endif |
|
|
386 |
|
|
|
387 |
DEBUGF("Setup %x %x %x %x\n", data[0], data[1], data[2], data[3]); |
|
|
388 |
|
|
|
389 |
switch(data[1]) { |
|
|
390 |
|
|
|
391 |
case CMD_ECHO: // echo (for transfer reliability testing) |
|
|
392 |
replyBuf[0] = data[2]; |
|
|
393 |
replyBuf[1] = data[3]; |
|
|
394 |
return 2; |
|
|
395 |
break; |
|
|
396 |
|
|
|
397 |
case CMD_GET_FUNC: |
|
|
398 |
memcpy_P(replyBuf, &func, sizeof(func)); |
|
|
399 |
return sizeof(func); |
|
|
400 |
break; |
|
|
401 |
|
|
|
402 |
case CMD_SET_DELAY: |
|
|
403 |
/* The delay function used delays 4 system ticks per cycle. */ |
|
|
404 |
/* This gives 1/3us at 12Mhz per cycle. The delay function is */ |
|
|
405 |
/* called twice per clock edge and thus four times per full cycle. */ |
|
|
406 |
/* Thus it is called one time per edge with the full delay */ |
|
|
407 |
/* value and one time with the half one. Resulting in */ |
|
|
408 |
/* 2 * n * 1/3 + 2 * 1/2 n * 1/3 = n us. */ |
|
|
409 |
clock_delay = *(unsigned short*)(data+2); |
|
|
410 |
if(!clock_delay) clock_delay = 1; |
|
|
411 |
clock_delay2 = clock_delay/2; |
|
|
412 |
if(!clock_delay2) clock_delay2 = 1; |
|
|
413 |
|
|
|
414 |
DEBUGF("request for delay %dus\n", clock_delay); |
|
|
415 |
break; |
|
|
416 |
|
|
|
417 |
case CMD_I2C_IO: |
|
|
418 |
case CMD_I2C_IO + CMD_I2C_BEGIN: |
|
|
419 |
case CMD_I2C_IO + CMD_I2C_END: |
|
|
420 |
case CMD_I2C_IO + CMD_I2C_BEGIN + CMD_I2C_END: |
|
|
421 |
// these are only allowed as class transfers |
|
|
422 |
|
|
|
423 |
return i2c_do((struct i2c_cmd*)data); |
|
|
424 |
break; |
|
|
425 |
|
|
|
426 |
case CMD_GET_STATUS: |
|
|
427 |
replyBuf[0] = status; |
|
|
428 |
return 1; |
|
|
429 |
break; |
|
|
430 |
|
|
|
431 |
default: |
|
|
432 |
// must not happen ... |
|
|
433 |
break; |
|
|
434 |
} |
|
|
435 |
|
|
|
436 |
return 0; // reply len |
|
|
437 |
} |
|
|
438 |
|
|
|
439 |
|
|
|
440 |
/*---------------------------------------------------------------------------*/ |
|
|
441 |
/* usbFunctionRead */ |
|
|
442 |
/*---------------------------------------------------------------------------*/ |
|
|
443 |
|
|
|
444 |
#ifndef USBTINY |
|
|
445 |
uchar usbFunctionRead( uchar *data, uchar len ) |
|
|
446 |
#else |
|
|
447 |
extern byte_t usb_in ( byte_t* data, byte_t len ) |
|
|
448 |
#endif |
|
|
449 |
{ |
|
|
450 |
uchar i; |
|
|
451 |
|
|
|
452 |
DEBUGF("read %d bytes, %d exp\n", len, expected); |
|
|
453 |
|
|
|
454 |
if(status == STATUS_ADDRESS_ACK) { |
|
|
455 |
if(len > expected) { |
|
|
456 |
DEBUGF("exceeds!\n"); |
|
|
457 |
len = expected; |
|
|
458 |
} |
|
|
459 |
|
|
|
460 |
// consume bytes |
|
|
461 |
for(i=0;i<len;i++) { |
|
|
462 |
expected--; |
|
|
463 |
*data = i2c_get_u08(expected == 0); |
|
|
464 |
DEBUGF("data = %x\n", *data); |
|
|
465 |
data++; |
|
|
466 |
} |
|
|
467 |
|
|
|
468 |
// end transfer on last byte |
|
|
469 |
if((saved_cmd & CMD_I2C_END) && !expected) |
|
|
470 |
i2c_stop(); |
|
|
471 |
|
|
|
472 |
} else { |
|
|
473 |
DEBUGF("not in ack state\n"); |
|
|
474 |
memset(data, 0, len); |
|
|
475 |
} |
|
|
476 |
return len; |
|
|
477 |
} |
|
|
478 |
|
|
|
479 |
/*---------------------------------------------------------------------------*/ |
|
|
480 |
/* usbFunctionWrite */ |
|
|
481 |
/*---------------------------------------------------------------------------*/ |
|
|
482 |
|
|
|
483 |
#ifndef USBTINY |
|
|
484 |
uchar usbFunctionWrite( uchar *data, uchar len ) |
|
|
485 |
#else |
|
|
486 |
extern void usb_out ( byte_t* data, byte_t len ) |
|
|
487 |
#endif |
|
|
488 |
{ |
|
|
489 |
uchar i, err=0; |
|
|
490 |
|
|
|
491 |
DEBUGF("write %d bytes, %d exp\n", len, expected); |
|
|
492 |
|
|
|
493 |
if(status == STATUS_ADDRESS_ACK) { |
|
|
494 |
if(len > expected) { |
|
|
495 |
DEBUGF("exceeds!\n"); |
|
|
496 |
len = expected; |
|
|
497 |
} |
|
|
498 |
|
|
|
499 |
// consume bytes |
|
|
500 |
for(i=0;i<len;i++) { |
|
|
501 |
expected--; |
|
|
502 |
DEBUGF("data = %x\n", *data); |
|
|
503 |
if(!i2c_put_u08(*data++)) |
|
|
504 |
err = 1; |
|
|
505 |
} |
|
|
506 |
|
|
|
507 |
// end transfer on last byte |
|
|
508 |
if((saved_cmd & CMD_I2C_END) && !expected) |
|
|
509 |
i2c_stop(); |
|
|
510 |
|
|
|
511 |
if(err) { |
|
|
512 |
DEBUGF("write failed\n"); |
|
|
513 |
//TODO: set status |
|
|
514 |
} |
|
|
515 |
|
|
|
516 |
} else { |
|
|
517 |
DEBUGF("not in ack state\n"); |
|
|
518 |
memset(data, 0, len); |
|
|
519 |
} |
|
|
520 |
|
|
|
521 |
#ifndef USBTINY |
|
|
522 |
return len; |
|
|
523 |
#endif |
|
|
524 |
} |
|
|
525 |
|
|
|
526 |
|
|
|
527 |
/* ------------------------------------------------------------------------- */ |
|
|
528 |
|
|
|
529 |
int main(void) { |
|
|
530 |
wdt_enable(WDTO_1S); |
|
|
531 |
|
|
|
532 |
#if DEBUG_LEVEL > 0 |
|
|
533 |
/* let debug routines init the uart if they want to */ |
|
|
534 |
odDebugInit(); |
|
|
535 |
#else |
|
|
536 |
#ifdef DEBUG |
|
|
537 |
/* quick'n dirty uart init */ |
|
|
538 |
UCSRB |= _BV(TXEN); |
|
|
539 |
UBRRL = F_CPU / (19200 * 16L) - 1; |
|
|
540 |
#endif |
|
|
541 |
#endif |
|
|
542 |
|
|
|
543 |
#ifdef DEBUG |
|
|
544 |
stdout = &mystdout; |
|
|
545 |
#endif |
|
|
546 |
|
|
|
547 |
DEBUGF("i2c-tiny-usb - (c) 2006 by Till Harbaum\n"); |
|
|
548 |
|
|
|
549 |
i2c_init(); |
|
|
550 |
|
|
|
551 |
#ifdef DEBUG |
|
|
552 |
i2c_scan(); |
|
|
553 |
#endif |
|
|
554 |
|
|
|
555 |
/* clear usb ports */ |
|
|
556 |
USB_CFG_IOPORT &= (uchar)~((1<<USB_CFG_DMINUS_BIT)|(1<<USB_CFG_DPLUS_BIT)); |
|
|
557 |
|
|
|
558 |
/* make usb data lines outputs */ |
|
|
559 |
USBDDR |= ((1<<USB_CFG_DMINUS_BIT)|(1<<USB_CFG_DPLUS_BIT)); |
|
|
560 |
|
|
|
561 |
/* USB Reset by device only required on Watchdog Reset */ |
|
|
562 |
_delay_loop_2(40000); // 10ms |
|
|
563 |
|
|
|
564 |
/* make usb data lines inputs */ |
|
|
565 |
USBDDR &= ~((1<<USB_CFG_DMINUS_BIT)|(1<<USB_CFG_DPLUS_BIT)); |
|
|
566 |
|
|
|
567 |
usbInit(); |
|
|
568 |
|
|
|
569 |
sei(); |
|
|
570 |
for(;;) { /* main event loop */ |
|
|
571 |
wdt_reset(); |
|
|
572 |
usbPoll(); |
|
|
573 |
} |
|
|
574 |
|
|
|
575 |
return 0; |
|
|
576 |
} |
|
|
577 |
|
|
|
578 |
/* ------------------------------------------------------------------------- */ |