dali/bacnet_stack
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

removed timeout code

Browse Source
This commit is contained in:
skarg
2010-09-23 00:52:41 +00:00
parent 6cb6200f39
commit 8098100483
1 changed files with 12 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
bacnet-stack/ports/bdk-atxx4-mstp/seeprom.c
+8 -4
View File
@@ -1,6 +1,7 @@
/************************************************************************** /**************************************************************************
* *
* Copyright (C) 2009 Steve Karg <skarg@users.sourceforge.net> * Copyright (C) 2009 Steve Karg <skarg@users.sourceforge.net>
* Used algorithm and code from Joerg Wunsch and Ruwan Jayanetti.
* *
* Permission is hereby granted, free of charge, to any person obtaining * Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the * a copy of this software and associated documentation files (the
@@ -25,6 +26,7 @@
#include <stdint.h> #include <stdint.h>
#include <stdlib.h> #include <stdlib.h>
#include "hardware.h" #include "hardware.h"
/* me */
#include "seeprom.h" #include "seeprom.h"
/* the SEEPROM chip select bits A2, A1, and A0 are grounded */ /* the SEEPROM chip select bits A2, A1, and A0 are grounded */
@@ -88,7 +90,7 @@
* complete, but low enough to properly abort an infinite loop in case * complete, but low enough to properly abort an infinite loop in case
* a slave is broken or not present at all. With 100 kHz TWI clock, * a slave is broken or not present at all. With 100 kHz TWI clock,
* transfering the start condition and SLA+R/W packet takes about 10 * transfering the start condition and SLA+R/W packet takes about 10
* µs. The longest write period is supposed to not exceed ~ 10 ms. * s. The longest write period is supposed to not exceed ~ 10 ms.
* Thus, normal operation should not require more than 100 iterations * Thus, normal operation should not require more than 100 iterations
* to get the device to respond to a selection. * to get the device to respond to a selection.
*/ */
@@ -276,7 +278,7 @@ int seeprom_bytes_read(
* RETURN: number of bytes written, or -1 on error * RETURN: number of bytes written, or -1 on error
* NOTES: only writes from offset to end of page. * NOTES: only writes from offset to end of page.
**************************************************************************/ **************************************************************************/
int seeprom_bytes_write_page( static int seeprom_bytes_write_page(
uint16_t eeaddr, /* SEEPROM starting memory address */ uint16_t eeaddr, /* SEEPROM starting memory address */
uint8_t * buf, /* data to send */ uint8_t * buf, /* data to send */
int len) int len)
@@ -419,8 +421,8 @@ int seeprom_bytes_write_page(
* byte is placed at the beginning of the same * byte is placed at the beginning of the same
* page. If more than 64 data words are * page. If more than 64 data words are
* transmitted to the EEPROM, the data word * transmitted to the EEPROM, the data word
* address will “roll over” and previous data will be * address will "roll over" and previous data will be
* overwritten. The address “roll over” during write * overwritten. The address "roll over" during write
* is from the last byte of the current page to the * is from the last byte of the current page to the
* first byte of the same page. * first byte of the same page.
**************************************************************************/ **************************************************************************/
@@ -461,6 +463,8 @@ void seeprom_init(
TWSR = 0; TWSR = 0;
TWCR = _BV(TWEN) | _BV(TWEA); TWCR = _BV(TWEN) | _BV(TWEA);
/* bit rate */ /* bit rate */
/* SCL freq = F_CPU/(16+2*TWBR*4^TWPS) */
/* since TWPS in TWSR is set to zero, 4^TWPS resolves to 1 */
TWBR = (F_CPU / SEEPROM_I2C_CLOCK - 16) / 2; TWBR = (F_CPU / SEEPROM_I2C_CLOCK - 16) / 2;
/* my address */ /* my address */
TWAR = 0; TWAR = 0;