Am 30.04.2021 um 15:06 schrieb Gregory Nutt:
... The main reason is that the AT24XX MTD driver only can handle
one type of devices on a single bus. ..
The is a deficiency in the driver and should be pretty easy to fix by
passing the I2C address during driver initialization. Other drivers
do that.
This has alrady been fixed - there is an option for that. The main
problem is that the capacity aka chip type is still a compile-time
option, and I'd like not to change this since it may break other
people's code.
I was referring to the run time configuration of the I2C address so that
you can run multiple copies of the driver. That would involve adding an
address parameter to at24c_initialize(). This is done for many other
drivers, for example, include/nuttx/sensors/lm75.h:
int lm75_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
uint8_t addr);
Yes, this is already there, if CONFIG_AT24XX_MULTI is defined.
#ifdef CONFIG_AT24XX_MULTI
FAR struct mtd_dev_s *at24c_initialize(FAR struct i2c_master_s *dev,
uint8_t address)
#else
FAR struct mtd_dev_s *at24c_initialize(FAR struct i2c_master_s *dev)
#endif
The char driver also allows for chip type runtine configuration. This
should be added to at24xx.
int ee24xx_initialize(FAR struct i2c_master_s *bus, uint8_t devaddr,
FAR char *devname, int devtype, int readonly)
