TS-7180 FRAM: Difference between revisions

Revision as of 16:52, 2 July 2018

The TS-7180 has 4Kbit ferroelectric random access memory (FRAM) organized as 512B. It is accessible via the SPI bus.

The FRAM may be accessed from userspace. It will appear as: /sys/class/spi_master/spi2/spi2.2/eeprom

The datasheet is available from Cypress Semiconductors' website.

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 The TS-7180 has 4Kbit ferroelectric random access memory (FRAM) organized as 512B.  It is accessible via the SPI bus.
-The FRAM may be accessed from userspace using the linux kernel's spidev device.  It will appear as "/dev/spidev2.2".
+The FRAM may be accessed from userspace.  It will appear as: '''/sys/class/spi_master/spi2/spi2.2/eeprom'''
-There is some [https://github.com/torvalds/linux/blob/master/tools/spi/spidev_test.c sample code] in the linux kernel Documentation folder that may be used for accessing SPI slaves from the command-line.  Some examples of using this program follow.
+The [http://www.cypress.com/file/136461/download datasheet] is available from Cypress Semiconductors' website.
-<source lang=bash>
-# Read from address 0x0000
-./spidev_test -D /dev/spidev2.2 -p "\x03\x00\x00"
-RX | 00 00 00
-# Set the FRAM_WP# line high
-tshwctl -a 5 -w 3
-# Enable writes
-./spidev_test -D /dev/spidev2.2 -p "\x06"
-# Read the status register to verify that bit #1 is now set
-./spidev_test -D /dev/spidev2.2 -p "\x05\x00"
-RX | 00 02
-# Write to address 0x0000
-./spidev_test -D /dev/spidev2.2 -p "\x02\x00\x12"
-# Read back to verify
-./spidev_test -D /dev/spidev2.2 -p "\x03\x00\x00"
-RX | 00 00 12
-# Disable writes
-./spidev_test -D /dev/spidev2.2 -p "\x04"
-</source>