Enable a DMed i2c driver for the ea-lpc3250devkitv2 board.
Include some sample commands/output for testing.
Signed-off-by: Trevor Woerner <twoer...@gmail.com>
---
Changes in v2:
- added
board/ea/ea-lpc3250devkitv2/README.rst | 54 +++++++++++++++++++
.../ea-lpc3250devkitv2/ea-lpc3250devkitv2.c | 4 ++
configs/ea-lpc3250devkitv2_defconfig | 3 ++
3 files changed, 61 insertions(+)
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;
}
diff --git a/configs/ea-lpc3250devkitv2_defconfig
b/configs/ea-lpc3250devkitv2_defconfig
index dc90e16475..e8d60b573e 100644
--- a/configs/ea-lpc3250devkitv2_defconfig
+++ b/configs/ea-lpc3250devkitv2_defconfig
@@ -14,9 +14,12 @@ CONFIG_DISTRO_DEFAULTS=y
CONFIG_BOARD_EARLY_INIT_F=y
CONFIG_SYS_PROMPT="EA-LPC3250v2=> "
CONFIG_CMD_GPIO=y
+CONFIG_CMD_I2C=y
CONFIG_OF_CONTROL=y
# CONFIG_NET is not set
CONFIG_LPC32XX_GPIO=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_LPC32XX=y
CONFIG_SPECIFY_CONSOLE_INDEX=y
CONFIG_CONS_INDEX=5
CONFIG_SYS_NS16550=y
--
2.30.0.rc0
