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Added checks to detect and work with faulty SEEPROM.

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This commit is contained in:
skarg
2012-12-22 05:41:38 +00:00
parent 4c0599f104
commit d9877756bf
2 changed files with 25 additions and 6 deletions
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bacnet-stack/ports/bdk-atxx4-mstp/seeprom.c
+14 -2
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@@ -108,6 +108,7 @@ int seeprom_bytes_read(
uint8_t sla, twcr, n = 0;
int rv = 0;
uint8_t twst; /* status - only valid while TWINT is set. */
uint16_t timeout = 0xFFFF;
#if SEEPROM_WORD_ADDRESS_16BIT
/* 16bit address devices need only TWI Device Address */
@@ -125,7 +126,12 @@ int seeprom_bytes_read(
/* send start condition */
TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
while ((TWCR & _BV(TWINT)) == 0) {
timeout--;
if (timeout == 0) {
return -1;
}
}
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_REP_START:
@@ -309,6 +315,7 @@ static int seeprom_bytes_write_page(
uint16_t endaddr;
uint8_t twst; /* status - only valid while TWINT is set. */
uint16_t page_end_addr;
uint16_t timeout = 0xFFFF;
/* limit the length to end of the EEPROM page */
page_end_addr = eeaddr | (SEEPROM_PAGE_SIZE - 1);
@@ -342,7 +349,12 @@ static int seeprom_bytes_write_page(
/* send start condition */
TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
/* wait for transmission */
while ((TWCR & _BV(TWINT)) == 0);
while ((TWCR & _BV(TWINT)) == 0) {
timeout--;
if (timeout == 0) {
return -1;
}
}
twst = TWSR & TW_STATUS_MASK;
switch (twst) {
case TW_REP_START: