static void
at24xxx_attach(void)
{
/* find the right I2C */
struct i2c_dev_s *i2c = up_i2cinitialize(PX4_I2C_BUS_ONBOARD);
/* this resets the I2C bus, set correct bus speed again */
I2C_SETFREQUENCY(i2c, 400000);
if (i2c == NULL)
errx(1, "failed to locate I2C bus");
/* start the MTD driver, attempt 5 times */
for (int i = 0; i < 5; i++) {
mtd_dev = at24c_initialize(i2c);
if (mtd_dev) {
/* abort on first valid result */
if (i > 0) {
warnx("warning: EEPROM needed %d attempts to attach", i+1);
}
break;
}
}
/* if last attempt is still unsuccessful, abort */
if (mtd_dev == NULL)
errx(1, "failed to initialize EEPROM driver");
attached = true;
}
int sam_at24config(void)
{
struct i2c_master_s *i2c;
struct mtd_dev_s *at24;
int ret;
/* Get an instance of the TWI0 interface */
i2c = sam_i2cbus_initialize(0);
if (!i2c)
{
ferr("ERROR: Failed to initialize TWI0\n");
return -ENODEV;
}
/* Initialize the AT24 driver */
at24 = at24c_initialize(i2c);
if (!at24)
{
ferr("ERROR: Failed to initialize the AT24 driver\n");
(void)sam_i2cbus_uninitialize(i2c);
return -ENODEV;
}
/* Make sure that the AT24 is in normal memory access mode */
ret = at24->ioctl(at24, MTDIOC_EXTENDED, 0);
if (ret < 0)
{
ferr("ERROR: AT24 ioctl(MTDIOC_EXTENDED) failed: %d\n", ret);
}
/* Bind the instance of an MTD device to the /dev/config device. */
ret = mtdconfig_register(at24);
if (ret < 0)
{
ferr("ERROR: Failed to bind AT24 driver to the MTD config device\n");
(void)sam_i2cbus_uninitialize(i2c);
}
return ret;
}
int sam_emac0_setmac(void)
{
struct i2c_master_s *i2c;
struct mtd_dev_s *at24;
uint8_t mac[6];
ssize_t nread;
int ret;
/* Get an instance of the TWI0 interface */
i2c = sam_i2cbus_initialize(0);
if (!i2c)
{
nerr("ERROR: Failed to initialize TWI0\n");
return -ENODEV;
}
/* Initialize the AT24 driver */
at24 = at24c_initialize(i2c);
if (!at24)
{
nerr("ERROR: Failed to initialize the AT24 driver\n");
(void)sam_i2cbus_uninitialize(i2c);
return -ENODEV;
}
/* Configure the AT24 to access the extended memory region */
ret = at24->ioctl(at24, MTDIOC_EXTENDED, 1);
if (ret < 0)
{
nerr("ERROR: AT24 ioctl(MTDIOC_EXTENDED) failed: %d\n", ret);
(void)sam_i2cbus_uninitialize(i2c);
return ret;
}
/* Read the MAC address */
nread = at24->read(at24, AT24XX_MACADDR_OFFSET, 6, mac);
if (nread < 6)
{
nerr("ERROR: AT24 read(AT24XX_MACADDR_OFFSET) failed: ld\n", (long)nread);
(void)sam_i2cbus_uninitialize(i2c);
return (int)nread;
}
/* Put the AT24 back in normal memory access mode */
ret = at24->ioctl(at24, MTDIOC_EXTENDED, 0);
if (ret < 0)
{
nerr("ERROR: AT24 ioctl(MTDIOC_EXTENDED) failed: %d\n", ret);
}
/* Release the I2C instance.
* REVISIT: Need an interface to release the AT24 instance too
*/
ret = sam_i2cbus_uninitialize(i2c);
if (ret < 0)
{
nerr("ERROR: Failed to release the I2C interface: %d\n", ret);
}
ninfo("MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
/* Now configure the EMAC driver to use this MAC address */
ret = sam_emac_setmacaddr(EMAC0_INTF, mac);
if (ret < 0)
{
nerr("ERROR: Failed to set MAC address: %d\n", ret);
}
return ret;
}
int stm32_at24_automount(int minor)
{
FAR struct i2c_master_s *i2c;
FAR struct mtd_dev_s *mtd;
static bool initialized = false;
int ret;
/* Have we already initialized? */
if (!initialized)
{
/* No.. Get the I2C bus driver */
finfo("Initialize I2C%d\n", AT24_I2C_BUS);
i2c = stm32_i2cbus_initialize(AT24_I2C_BUS);
if (!i2c)
{
ferr("ERROR: Failed to initialize I2C%d\n", AT24_I2C_BUS);
return -ENODEV;
}
/* Now bind the I2C interface to the AT24 I2C EEPROM driver */
finfo("Bind the AT24 EEPROM driver to I2C%d\n", AT24_I2C_BUS);
mtd = at24c_initialize(i2c);
if (!mtd)
{
ferr("ERROR: Failed to bind TWI%d to the AT24 EEPROM driver\n",
AT24_I2C_BUS);
return -ENODEV;
}
#if defined(CONFIG_STM32F103MINIMUM_AT24_FTL)
/* And finally, use the FTL layer to wrap the MTD driver as a block driver */
finfo("Initialize the FTL layer to create /dev/mtdblock%d\n", AT24_MINOR);
ret = ftl_initialize(AT24_MINOR, mtd);
if (ret < 0)
{
ferr("ERROR: Failed to initialize the FTL layer: %d\n", ret);
return ret;
}
#elif defined(CONFIG_STM32F103MINIMUM_AT24_NXFFS)
/* Initialize to provide NXFFS on the MTD interface */
finfo("Initialize the NXFFS file system\n");
ret = nxffs_initialize(mtd);
if (ret < 0)
{
ferr("ERROR: NXFFS initialization failed: %d\n", ret);
return ret;
}
/* Mount the file system at /mnt/at24 */
finfo("Mount the NXFFS file system at /dev/at24\n");
ret = mount(NULL, "/mnt/at24", "nxffs", 0, NULL);
if (ret < 0)
{
ferr("ERROR: Failed to mount the NXFFS volume: %d\n", errno);
return ret;
}
#endif
/* Now we are initialized */
initialized = true;
}
return OK;
}