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Reverted seeprom timeout for now. Lowered APDU size in Makefile. Changed stack based text to static buffer.

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This commit is contained in:
skarg
2010-09-23 00:34:26 +00:00
parent 80c27fd0b5
commit 6cb6200f39
3 changed files with 47 additions and 62 deletions
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bacnet-stack/ports/bdk-atxx4-mstp/seeprom.c
+31 -46
View File
@@ -1,7 +1,6 @@
/**************************************************************************
*
* 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
* a copy of this software and associated documentation files (the
@@ -26,8 +25,6 @@
#include <stdint.h>
#include <stdlib.h>
#include "hardware.h"
#include "timer.h"
/* me */
#include "seeprom.h"
/* the SEEPROM chip select bits A2, A1, and A0 are grounded */
@@ -97,26 +94,6 @@
*/
#define MAX_ITER 200
/*************************************************************************
* DESCRIPTION: Wait for interrupt flag to indicate transmit is complete
* RETURN: true on success, or false on error
* NOTES: none
**************************************************************************/
static bool twi_wait_for_transmission(void)
{
uint8_t timeout = 255;
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0) {
if (!(timeout--)) {
return false;
}
continue;
}
return true;
}
/*************************************************************************
* DESCRIPTION: Return bytes from SEEPROM memory at address
* RETURN: number of bytes read, or -1 on error
@@ -146,7 +123,8 @@ int seeprom_bytes_read(
begin:
/* send start condition */
TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_REP_START:
@@ -167,7 +145,8 @@ int seeprom_bytes_read(
TWDR = sla | TW_WRITE;
/* clear interrupt to start transmission */
TWCR = _BV(TWINT) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_MT_SLA_ACK:
@@ -188,7 +167,8 @@ int seeprom_bytes_read(
TWDR = (eeaddr >> 8);
/* clear interrupt to start transmission */
TWCR = _BV(TWINT) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_MT_DATA_ACK:
@@ -206,7 +186,8 @@ int seeprom_bytes_read(
TWDR = eeaddr;
/* clear interrupt to start transmission */
TWCR = _BV(TWINT) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_MT_DATA_ACK:
@@ -223,7 +204,8 @@ int seeprom_bytes_read(
/* Note [12] Next cycle(s): master receiver mode */
/* send repeated start condition */
TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_START:
@@ -240,7 +222,8 @@ int seeprom_bytes_read(
TWDR = sla | TW_READ;
/* clear interrupt to start transmission */
TWCR = _BV(TWINT) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_MR_SLA_ACK:
@@ -262,7 +245,7 @@ int seeprom_bytes_read(
/* clear int to start transmission */
TWCR = twcr;
/* wait for transmission */
twi_wait_for_transmission();
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_MR_DATA_NACK:
@@ -293,7 +276,7 @@ int seeprom_bytes_read(
* RETURN: number of bytes written, or -1 on error
* NOTES: only writes from offset to end of page.
**************************************************************************/
static int seeprom_bytes_write_page(
int seeprom_bytes_write_page(
uint16_t eeaddr, /* SEEPROM starting memory address */
uint8_t * buf, /* data to send */
int len)
@@ -323,9 +306,8 @@ static int seeprom_bytes_write_page(
}
begin:
/* Note [15] */
/* send start condition */
TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
twi_wait_for_transmission();
TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN); /* send start condition */
while ((TWCR & _BV(TWINT)) == 0); /* wait for transmission */
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_REP_START:
@@ -343,7 +325,8 @@ static int seeprom_bytes_write_page(
TWDR = sla | TW_WRITE;
/* clear interrupt to start transmission */
TWCR = _BV(TWINT) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_MT_SLA_ACK:
@@ -363,7 +346,8 @@ static int seeprom_bytes_write_page(
TWDR = (eeaddr >> 8);
/* clear interrupt to start transmission */
TWCR = _BV(TWINT) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_MT_DATA_ACK:
@@ -381,7 +365,9 @@ static int seeprom_bytes_write_page(
TWDR = eeaddr;
/* clear interrupt to start transmission */
TWCR = _BV(TWINT) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0) {
};
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_MT_DATA_ACK:
@@ -398,7 +384,8 @@ static int seeprom_bytes_write_page(
TWDR = *buf;
/* start transmission */
TWCR = _BV(TWINT) | _BV(TWEN);
twi_wait_for_transmission();
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_MT_DATA_NACK:
@@ -426,14 +413,14 @@ static int seeprom_bytes_write_page(
/*************************************************************************
* DESCRIPTION: Write some data and wait until it is sent
* RETURN: number of bytes written, or -1 on error
* NOTES:
* When the word address, internally generated,
* NOTES:
* When the word address, internally generated,
* reaches the page boundary, the following
* 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
* transmitted to the EEPROM, the data word
* address will "roll over" and previous data will be
* overwritten. The address "roll over" during write
* transmitted to the EEPROM, the data word
* address will “roll over” and previous data will be
* overwritten. The address “roll over” during write
* is from the last byte of the current page to the
* first byte of the same page.
**************************************************************************/
@@ -474,8 +461,6 @@ void seeprom_init(
TWSR = 0;
TWCR = _BV(TWEN) | _BV(TWEA);
/* 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;
/* my address */
TWAR = 0;