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SAMV71-XULT: Enable I2C and the I2C tool in the NSH configuration

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This commit is contained in:
Gregory Nutt 2015-03-12 12:27:06 -06:00
parent 26ac9361e7
commit 7f4959b864
2 changed files with 124 additions and 5 deletions
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104
configs/samv71-xult/README.txt
View File

@ -11,6 +11,7 @@ Contents
- Board Features
- Serial Console
- LEDs and Buttons
- AT24MAC402 Serial EEPROM
- Debugging
- Configurations
@ -171,6 +172,31 @@ NOTES:
use the SW1, PB12 has to be configured as a normal regular I/O pin in
the MATRIX module. For more information see the SAM V71 datasheet.
AT24MAC402 Serial EEPROM
========================
The SAM V71 Xplained Ultra features one external AT24MAC402 serial EEPROM
with a EIA-48 MAC address connected to the SAM V71 through I2C. This device
contains a MAC address for use with the Ethernet interface.
Connectivity:
------ -------- -------- ------------------------------------------
SAMV71 SAMV71 I2C Shared
Pin Function Function Functionality
------ -------- -------- ------------------------------------------
PA03 TWID0 SDA EXT1, EXT2, EDBG I2C, LCD, Camera, Audio,
MediaLB, and Shield
PA04 TWICK0 SCL EXT1, EXT2, EDBG I2C, LCD, Camera, Audio,
MediaLB, and Shield
------ -------- -------- ------------------------------------------
I2C address:
The 7-bit address of the AT24 part is is 0b1011AAA where AAA is the state
of the A0, A1, and A3 pins on the part. On the SAMV71-XULT board, these
are all pulled high so the full, 7-bit address is 0x5f.
Debugging
=========
@ -313,7 +339,83 @@ Configuration sub-directories
SW1 depressed
nsh>
4. Performance-related Configuration settings:
4. TWI/I2C
TWIHS0 is enabled in this configuration. The SAM V71 Xplained Ultra
supports two devices on the one on-board I2C device on the TWIHS0 bus:
(1) The AT24MAC402 serial EEPROM described above and (2) the Wolfson
WM8904 audio CODEC. This device contains a MAC address for use with
the Ethernet interface.
In this configuration, the I2C tool at apps/system/i2ctool is
enabled. This tools supports interactive access to I2C devices on
the enabled TWIHS bus. Relevant configuration settings:
CONFIG_SAMV7_TWIHS0=y
CONFIG_SAMV7_TWIHS0_FREQUENCY=100000
CONFIG_I2C=y
CONFIG_I2C_TRANSFER=y
CONFIG_SYSTEM_I2CTOOL=y
CONFIG_I2CTOOL_MINBUS=0
CONFIG_I2CTOOL_MAXBUS=0
CONFIG_I2CTOOL_MINADDR=0x03
CONFIG_I2CTOOL_MAXADDR=0x77
CONFIG_I2CTOOL_MAXREGADDR=0xff
CONFIG_I2CTOOL_DEFFREQ=400000
Example usage:
nsh> i2c
Usage: i2c <cmd> [arguments]
Where <cmd> is one of:
Show help : ?
List busses : bus
List devices : dev [OPTIONS] <first> <last>
Read register : get [OPTIONS] [<repititions>]
Show help : help
Write register: set [OPTIONS] <value> [<repititions>]
Verify access : verf [OPTIONS] [<value>] [<repititions>]
Where common "sticky" OPTIONS include:
[-a addr] is the I2C device address (hex). Default: 03 Current: 03
[-b bus] is the I2C bus number (decimal). Default: 0 Current: 0
[-r regaddr] is the I2C device register address (hex). Default: 00 Current: 00
[-w width] is the data width (8 or 16 decimal). Default: 8 Current: 8
[-s|n], send/don't send start between command and data. Default: -n Current: -n
[-i|j], Auto increment|don't increment regaddr on repititions. Default: NO Current: NO
[-f freq] I2C frequency. Default: 400000 Current: 400000
NOTES:
o An environment variable like $PATH may be used for any argument.
o Arguments are "sticky". For example, once the I2C address is
specified, that address will be re-used until it is changed.
WARNING:
o The I2C dev command may have bad side effects on your I2C devices.
Use only at your own risk.
nsh> i2c bus
BUS EXISTS?
Bus 0: YES
nsh> i2c dev 3 77
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- 1a -- -- -- -- --
20: -- -- -- -- -- -- -- -- 28 -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- 37 -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- 4e --
50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- 5f
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
nsh>
Where 0x1a us the address of the WM8904 Audio CODIE and 0x5f is the
address of the AT24 EEPROM (I am not sure what the others are as
this writing).
5. Performance-related Configuration settings:
CONFIG_ARMV7M_ICACHE=y : Instruction cache is enabled
CONFIG_ARMV7M_DCACHE=y : Data cache is enabled

25
configs/samv71-xult/nsh/defconfig
View File

@ -210,9 +210,9 @@ CONFIG_SAMV7_HAVE_USART2=y
# CONFIG_SAMV7_TC10 is not set
# CONFIG_SAMV7_TC11 is not set
# CONFIG_SAMV7_TRNG is not set
# CONFIG_SAMV7_TWIM0 is not set
# CONFIG_SAMV7_TWIM1 is not set
# CONFIG_SAMV7_TWIM2 is not set
CONFIG_SAMV7_TWIHS0=y
# CONFIG_SAMV7_TWIHS1 is not set
# CONFIG_SAMV7_TWIHS2 is not set
# CONFIG_SAMV7_UART0 is not set
# CONFIG_SAMV7_UART1 is not set
# CONFIG_SAMV7_UART2 is not set
@ -232,6 +232,11 @@ CONFIG_SAMV7_GPIOB_IRQ=y
# CONFIG_SAMV7_GPIOD_IRQ is not set
# CONFIG_SAMV7_GPIOE_IRQ is not set
#
# TWIHS device driver options
#
CONFIG_SAMV7_TWIHS0_FREQUENCY=100000
#
# Architecture Options
#
@ -432,7 +437,12 @@ CONFIG_DEV_NULL=y
# CONFIG_ARCH_HAVE_PWM_PULSECOUNT is not set
# CONFIG_PWM is not set
# CONFIG_ARCH_HAVE_I2CRESET is not set
# CONFIG_I2C is not set
CONFIG_I2C=y
# CONFIG_I2C_SLAVE is not set
CONFIG_I2C_TRANSFER=y
# CONFIG_I2C_WRITEREAD is not set
# CONFIG_I2C_POLLED is not set
# CONFIG_I2C_TRACE is not set
CONFIG_SPI=y
# CONFIG_SPI_OWNBUS is not set
CONFIG_SPI_EXCHANGE=y
@ -912,6 +922,13 @@ CONFIG_NSH_CONSOLE=y
#
# I2C tool
#
CONFIG_SYSTEM_I2CTOOL=y
CONFIG_I2CTOOL_MINBUS=0
CONFIG_I2CTOOL_MAXBUS=0
CONFIG_I2CTOOL_MINADDR=0x03
CONFIG_I2CTOOL_MAXADDR=0x77
CONFIG_I2CTOOL_MAXREGADDR=0xff
CONFIG_I2CTOOL_DEFFREQ=400000
#
# INI File Parser