From bc35bb23dd8cb035c080f8ef8b4cd7a30d5184c2 Mon Sep 17 00:00:00 2001
From: px4dev <px4@purgatory.org>
Date: Fri, 18 Jan 2013 00:43:57 -0800
Subject: HOTFIX: disable interrupt-driven I2C mode, configure pessimistic I2C
 timeout, correct handling of the NAK generation for I2C master reads.

This looks like it addresses the recent I2C lockup issue, unfortunately it also increases CPU consumption by ~5% for the I2C sensor bus.
---
 apps/systemcmds/eeprom/24xxxx_mtd.c | 27 +++++++++++++++++++++++++++
 apps/systemcmds/eeprom/eeprom.c     | 13 +++++++++++++
 2 files changed, 40 insertions(+)

(limited to 'apps')

diff --git a/apps/systemcmds/eeprom/24xxxx_mtd.c b/apps/systemcmds/eeprom/24xxxx_mtd.c
index 781b01065..e34be44e3 100644
--- a/apps/systemcmds/eeprom/24xxxx_mtd.c
+++ b/apps/systemcmds/eeprom/24xxxx_mtd.c
@@ -163,6 +163,8 @@ static ssize_t at24c_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
 			    size_t nblocks, FAR const uint8_t *buf);
 static int at24c_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg);
 
+void at24c_test(void);
+
 /************************************************************************************
  * Private Data
  ************************************************************************************/
@@ -218,6 +220,31 @@ static int at24c_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nbloc
 	return (int)nblocks;
 }
 
+/************************************************************************************
+ * Name: at24c_test
+ ************************************************************************************/
+
+void at24c_test(void)
+{
+	uint8_t buf[CONFIG_AT24XX_MTD_BLOCKSIZE];
+	unsigned count = 0;
+	unsigned errors = 0;
+
+	for (count = 0; count < 10000; count++) {
+		ssize_t result = at24c_bread(&g_at24c.mtd, 0, 1, buf);
+		if (result == ERROR) {
+			if (errors++ > 2) {
+				vdbg("too many errors\n");
+				return;
+			}
+		} else if (result != 1) {
+			vdbg("unexpected %u\n", result);
+		}
+		if ((count % 100) == 0)
+			vdbg("test %u errors %u\n", count, errors);
+	}
+}
+
 /************************************************************************************
  * Name: at24c_bread
  ************************************************************************************/
diff --git a/apps/systemcmds/eeprom/eeprom.c b/apps/systemcmds/eeprom/eeprom.c
index b4257cda9..49da51358 100644
--- a/apps/systemcmds/eeprom/eeprom.c
+++ b/apps/systemcmds/eeprom/eeprom.c
@@ -73,6 +73,7 @@ static void	eeprom_erase(void);
 static void	eeprom_ioctl(unsigned operation);
 static void	eeprom_save(const char *name);
 static void	eeprom_load(const char *name);
+static void	eeprom_test(void);
 
 static bool attached = false;
 static bool started = false;
@@ -93,6 +94,9 @@ int eeprom_main(int argc, char *argv[])
 		if (!strcmp(argv[1], "erase"))
 			eeprom_erase();
 
+		if (!strcmp(argv[1], "test"))
+			eeprom_test();
+
 		if (0) {	/* these actually require a file on the filesystem... */
 
 			if (!strcmp(argv[1], "reformat"))
@@ -250,3 +254,12 @@ eeprom_load(const char *name)
 
 	exit(0);
 }
+
+extern void at24c_test(void);
+
+static void
+eeprom_test(void)
+{
+	at24c_test();
+	exit(0);
+}
-- 
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