diff options
Diffstat (limited to 'board/pdeval-stm32f072/PD_evaluation.md')
| -rw-r--r-- | board/pdeval-stm32f072/PD_evaluation.md | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/board/pdeval-stm32f072/PD_evaluation.md b/board/pdeval-stm32f072/PD_evaluation.md index b7fec09f35..395466f477 100644 --- a/board/pdeval-stm32f072/PD_evaluation.md +++ b/board/pdeval-stm32f072/PD_evaluation.md @@ -38,8 +38,8 @@ then document the new `CONFIG_USB_PD_TCPM_` variable in the [include/config.h](. In [board/pdeval-stm32f072/board.h](board.h), you can update `CONFIG_USB_PD_PORT_COUNT` to the actual number of ports on your board. You also need to create/delete the corresponding `PD_Cx` tasks in [board/pdeval-stm32f072/ec.tasklist](ec.tasklist). -By default, the firmware is using I2C1 with SCL/SDA on pins PB6 and PB7, running with a 100kHz clock. -To change the pins or speed, you need to edit `i2c_ports` in [board/pdeval-stm32f072/board.c](board.c), update `I2C_PORT_TCPC` in [board/pdeval-stm32f072/board.h](board.h) with the right controller number, and change the pin mux in [board/pdeval-stm32f072/gpio.inc](gpio.inc). +By default, the firmware is using I2C1 with SCL/SDA on pins PB6 and PB7, running with a 100kHz clock, and tries to talk to TCPCs at i2c slave addresses 0x9c and 0x9e. +To change the pins or speed, you need to edit `i2c_ports` in [board/pdeval-stm32f072/board.c](board.c), update `I2C_PORT_TCPC` in [board/pdeval-stm32f072/board.h](board.h) with the right controller number, and change the pin mux in [board/pdeval-stm32f072/gpio.inc](gpio.inc). To change TCPC i2c slave addresses, update `TCPC1_I2C_ADDR` and `TCPC2_I2C_ADDR` in [board/pdeval-stm32f072/board.h](board.h). The I2C bus needs pull-up resistors on SCL/SDA. If your setup doesn't have external pull-ups on those lines, you can activate the chip internal pull-ups (but they are a bit weak for I2C) by editing [board/pdeval-stm32f072/gpio.inc](gpio.inc) and updating the alternate mode configuration flags with `GPIO_PULL_UP` e.g. : `ALTERNATE(PIN_MASK(B, 0x00c0), 1, MODULE_I2C, GPIO_PULL_UP) /* I2C MASTER:PB6/7 */` |