SunnyShine Solar Plant Project

FOXZB is an add-on board to adapt a MaxStream XBee module, a RS485 bus, a MMC/SD memory card, a Sensirion SHT71/75 humidity and temperature sensor and a Real Time Clock circuitry with Li-ion battery

FOXZB is an add-on board for the FOX Board equipped with: A placement for a MaxStream XBee or XBeePRO module. An half-duplex RS485 interface A MMC/SD memory card socket A placement for Sensirion SHT71/75 humidity and temperature sensor A Real Time Clock circuitry with Li-ion battery The size of this board is right the same of FOX Board and it is designed to be mounted over the top side of the FOX Board as shown on the photo below: FOX Board LX and FOXZB add on board

The MMC/SD memory card holder is wired to the FOX Board as explained on Connect a MMC or SD card memory.
We tried this socket with SD cards up to 2GB 150x.

Configure the FOX Board SDK to install the MMC/SD Kernel module

From the devboard directory type:

# make menuconfig

Enable the option:

Driver settings --> [*] Enable MMC Support

Save and exit then, to generate the fimage, type:

# ./configure
...
# make

Flash the FOX Board with the new image (see How to reflash a FOX Board) and login to it with root and pass.

Mounting the MMC card

Insert the MMC/SD card inside the holder then mount it typing:

# mount /dev/mmc0 /mnt/0 -t vfat -o noatime,sync

Now you could see the content of the MMC/SD card on /mnt/0 directory typing:

# ls -l /mnt/0

RTC circuitry is wired to the FOX Board as explained on Add a Dallas DS1302 I2C Real Time Clock.
To enable the RTC support on the FOX Board image click on Enable the Real Time Clock

Configure the FOX Board SDK to enable the RTC support

Go inside the SDK root folder (i.e. /devboard-R2_01) and type:

# source init_env
...
# make kernelconfig

Select the item:

Driver for built.in interfaces --->

Configure the RTC section parms like on this screenshot:

[*] Real Time Clock Support
      RTC chip (DS1302)  --->
[*] DS1302 RST on Generic Port
(2) DS1302 RST bit number
(1) DS1302 SCL bit number
(0) DS1302 SDA bit number
(0) DS1302 Trickle charger value

Exit and save the configuration then type:

# make
...

Flash the FOX Board with the new image (see How to reflash a FOX Board) and login to it with root and pass.

Commands to manage system clock and date

To read the FOX board Linux system clock and date the right command is:

date

To program a desired value of clock and date as system clock and date in the FOX Linux system the command is:

date MMDDHHMMYYYY

Example: 13:50 of May 18th 2005

date 051813502005

To store in permanent way the system clock and date just set, in the RTC chip so to reload it at every power on cycle, type the following command:

hwclock -w

How to use the RS485 interface
This article shows how to configure the serial port ttyS3 on the FOX Board LX to operate as RS485 half duplex interface

The only serial port enabled to work as RS485 is the /dev/ttyS3.

To use correctly the RS485 interface chip we need to configure the serial port driver

To enable the RS485 support use make kernelconfig command and enable:

Drivers for built-in interfaces --->
  [*] RS-485 support

then generate the new flash image and transfer it to the FOX Board LX.