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| author | Trevor Woerner <twoerner@gmail.com> | 2021-06-10 22:37:09 -0400 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-07-06 14:12:15 -0400 |
| commit | ba621fe3a97e2b576eec3a27a06aa28af123badc (patch) | |
| tree | dc47bc96f54036617c4726a6168b96a4e99ffad2 /board | |
| parent | 0705556bc4d82d0fe72b68bab3a83b4e52b128df (diff) | |
| download | u-boot-ba621fe3a97e2b576eec3a27a06aa28af123badc.tar.gz | |
lpc32xx: ea-lpc3250devkitv2: enable i2c (DM)
Enable a DMed i2c driver for the ea-lpc3250devkitv2 board.
Include some sample commands/output for testing.
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Diffstat (limited to 'board')
| -rw-r--r-- | board/ea/ea-lpc3250devkitv2/README.rst | 54 | ||||
| -rw-r--r-- | board/ea/ea-lpc3250devkitv2/ea-lpc3250devkitv2.c | 4 |
2 files changed, 58 insertions, 0 deletions
diff --git a/board/ea/ea-lpc3250devkitv2/README.rst b/board/ea/ea-lpc3250devkitv2/README.rst index 56b5d0dbb1..1b78000331 100644 --- a/board/ea/ea-lpc3250devkitv2/README.rst +++ b/board/ea/ea-lpc3250devkitv2/README.rst @@ -4,6 +4,7 @@ ToC: - Introduction - Booting - Debugging +- i2c Introduction @@ -130,3 +131,56 @@ dongle from Olimex successfully as follows: # openocd \ -f interface/ftdi/olimex-arm-usb-ocd-h.cfg \ -f board/phytec_lpc3250.cfg + + +i2c +=== +Some of the LEDs on the board are connected via an I/O Expander (PCA9532) that +is attached to the i2c1 bus. Here is a sample session of toggling some of +these LEDs via i2c in U-Boot: + +show the existing i2c busses: + EA-LPC3250v2=> i2c bus + Bus 0: i2c@300 + Bus 1: i2c@400a0000 + Bus 2: i2c@400a8000 + +set i2c1 as the current bus: + EA-LPC3250v2=> i2c dev 1 + Setting bus to 1 + +see what potential devices are found with rudimentary probing on i2c1: + EA-LPC3250v2=> i2c probe + Valid chip addresses: 1A 1D 48 50 57 60 66 6E + +According to the schematics the i2c slave address of the PCA9532 is 0x60. + +dump all of the 10 registers from the I/O Expander; NOTE that the 0x10 in the +command specifies the self-incrementing mode of the PCA9532; also NOTE that +the values repeat themseves to fill out a full 16 bytes: + EA-LPC3250v2=> i2c md 0x60 0x10 10 + 0010: 00 ff 00 80 00 80 00 00 00 00 4f ff 00 80 00 80 ..........O..... + +turn on LEDs 23, 25, 27, and 29 (green): + EA-LPC3250v2=> i2c mw 0x60 9 0x55 + +turn on LEDs 22, 24, 26, and 28 (red): + EA-LPC3250v2=> i2c mw 0x60 8 0x55 + +dim the green LEDs (23, 25, 27, 29): + EA-LPC3250v2=> i2c mw 0x60 3 0x20 + EA-LPC3250v2=> i2c mw 0x60 9 0xaa + +turn off all LEDs (23-29): + EA-LPC3250v2=> i2c mw 0x60 8 0 + EA-LPC3250v2=> i2c mw 0x60 9 0 + +read value of switches (input): + EA-LPC3250v2=> i2c md 0x60 0 1 + 0000: 4f O +[none are pressed] + +press and hold SW2 while running the following: + EA-LPC3250v2=> i2c md 0x60 0 1 + 0000: 4e N +[SW2 is pressed] diff --git a/board/ea/ea-lpc3250devkitv2/ea-lpc3250devkitv2.c b/board/ea/ea-lpc3250devkitv2/ea-lpc3250devkitv2.c index 7a19400041..72cf46c749 100644 --- a/board/ea/ea-lpc3250devkitv2/ea-lpc3250devkitv2.c +++ b/board/ea/ea-lpc3250devkitv2/ea-lpc3250devkitv2.c @@ -19,6 +19,10 @@ int board_early_init_f(void) { lpc32xx_uart_init(CONFIG_CONS_INDEX); + if (IS_ENABLED(CONFIG_SYS_I2C_LPC32XX)) { + lpc32xx_i2c_init(1); + lpc32xx_i2c_init(2); + } return 0; } |