diff options
Diffstat (limited to 'apps/systemcmds/eeprom/24xxxx_mtd.c')
| -rw-r--r-- | apps/systemcmds/eeprom/24xxxx_mtd.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/apps/systemcmds/eeprom/24xxxx_mtd.c b/apps/systemcmds/eeprom/24xxxx_mtd.c index b5144512b..1b8c59f77 100644 --- a/apps/systemcmds/eeprom/24xxxx_mtd.c +++ b/apps/systemcmds/eeprom/24xxxx_mtd.c @@ -138,6 +138,8 @@ struct at24c_dev_s perf_counter_t perf_reads; perf_counter_t perf_writes; + perf_counter_t perf_resets; + perf_counter_t perf_read_retries; }; /************************************************************************************ @@ -267,6 +269,7 @@ static ssize_t at24c_bread(FAR struct mtd_dev_s *dev, off_t startblock, for (;;) { + unsigned tries = 50; perf_begin(priv->perf_reads); ret = I2C_TRANSFER(priv->dev, &msgv[0], 2); @@ -274,9 +277,20 @@ static ssize_t at24c_bread(FAR struct mtd_dev_s *dev, off_t startblock, if (ret >= 0) break; - /* XXX probably want a bus reset in here and an eventual timeout */ fvdbg("read stall"); usleep(1000); + perf_count(priv->perf_read_retries); + + /* + * Kick the bus in case it's stuck. + */ + if (--tries == 0) + { + tries = 50; + up_i2creset(priv->dev); + perf_count(priv->perf_resets); + } + } startblock++; @@ -480,6 +494,8 @@ FAR struct mtd_dev_s *at24c_initialize(FAR struct i2c_dev_s *dev) priv->perf_reads = perf_alloc(PC_ELAPSED, "EEPROM read"); priv->perf_writes = perf_alloc(PC_ELAPSED, "EEPROM write"); + priv->perf_resets = perf_alloc(PC_COUNT, "EEPROM reset"); + priv->perf_read_retries = perf_alloc(PC_COUNT, "EEPROM read retries"); } /* Return the implementation-specific state structure as the MTD device */ |