Update gpio-i2c-phat.md

draft/overlay/gpio-i2c-phat.md

@@ -6,51 +6,65 @@ type: io
 formfactor: pHAT
 manufacturer: PlasmaDan
 description: 4 Extra I2C Buses for Raspberry Pi.
+url: https://plasmadan.com/gpioi2c
 github: https://github.com/plasmadancom/GPIO-I2C-pHAT
 buy: https://plasmadan.com/gpioi2c
 image: 'gpio-i2c-phat.png'
 pincount: 40
 eeprom: no
-power:
-ground:
 pin:
-  '4':
+  '7':
     name: I2C3 SDA
     mode: i2c
+    direction: both
+    active: high
   '15':
     name: I2C6 SDA
     mode: i2c
+    direction: both
+    active: high
   '16':
     name: I2C6 SCL
     mode: i2c
+    direction: both
+    active: high
   '29':
     name: I2C3 SCL
     mode: i2c
+    direction: both
+    active: high
   '21':
     name: I2C4 SCL
     mode: i2c
+    direction: both
+    active: high
   '24':
     name: I2C4 SDA
     mode: i2c
+    direction: both
+    active: high
   '32':
     name: I2C5 SDA
     mode: i2c
+    direction: both
+    active: high
   '33':
     name: I2C5 SCL
     mode: i2c
+    direction: both
+    active: high
 -->
 # GPIO I2C pHAT
 
-The GPIO I2C pHAT is an I2C switch for Raspberry Pi which remaps the I2C bus (pins 3 & 5) to 1 of 4 additional buses, allowing any I2C based add-on board to use an alternative I2C bus, without the need for multiplexers or expanders.
+The GPIO I2C pHAT is an I2C switch which mounts under your HAT to remap its I2C pins (GPIO 2 & GPIO 3) to 1 of 4 additional I2C buses, without the need for a multiplexer or expander.
 
-Makes use of the extra hardware I2C buses introduced on Raspberry Pi 4 (BCM2711) or software I2C (bit bang). Multiple GPIO I2C boards can be stacked along with other HATs or pHATs. Switching is controlled using a 4-position double-pole slide switch, which allows you to quickly switch between buses.
-
-Includes a breakout header for the 4 extra I2C buses. These are always connected to the associated GPIO pins so can be used regardless of the switch position. Note: external pull-up resistors to 3.3V required.
+Makes use of the extra hardware I2C buses introduced on Raspberry Pi 4 (BCM2711) or software I2C (bit bang). Switching is controlled using a 4-position double-pole slide switch, which allows you to quickly switch between buses.
 
 ## Features
 
 * Adds 4 additional I2C buses with breakout
 * User selectable I2C GPIO pin remapping
+* Hardware I2C compatible (Pi 4)
 * Slide switch allows fast bus switching
 * No-conflict solder jumpers
 * Stackable design
@@ -60,11 +74,24 @@ Includes a breakout header for the 4 extra I2C buses. These are always connected
 
 Add required dtoverlay parameter(s) to ```/boot/config.txt``` and reboot.
 
-| Switch Position | Hardware I2C (Pi 4) | Software I2C (Bit Bang) | GPIO |
-| :---: | :---: | :---: | :---: |
-| I2C3 | dtoverlay=i2c3 | dtoverlay=i2c-gpio,bus=3,i2c_gpio_sda=4,i2c_gpio_scl=5 | 4 5 |
-| I2C4 | dtoverlay=i2c4 | dtoverlay=i2c-gpio,bus=4,i2c_gpio_sda=8,i2c_gpio_scl=9 | 8 9 |
-| I2C5 | dtoverlay=i2c5 | dtoverlay=i2c-gpio,bus=5,i2c_gpio_sda=12,i2c_gpio_scl=13 | 12 13 |
-| I2C6 | dtoverlay=i2c6 | dtoverlay=i2c-gpio,bus=6,i2c_gpio_sda=22,i2c_gpio_scl=23 | 22 23 |
+Mount the GPIO I2C pHAT board to your Pi, use the slide switch to select your preferred I2C bus and stack your I2C based HAT on top.
 
-Note: When using multiple software I2C buses, add the parameters from highest to lowest, i.e., 6, 5, 4, 3.
+## Hardware I2C (Pi 4 Only)
+
+```
+dtoverlay=i2c3
+dtoverlay=i2c4
+dtoverlay=i2c5
+dtoverlay=i2c6
+```
+
+## Software I2C (Bit Bang)
+
+```
+dtoverlay=i2c-gpio,bus=6,i2c_gpio_sda=22,i2c_gpio_scl=23
+dtoverlay=i2c-gpio,bus=5,i2c_gpio_sda=12,i2c_gpio_scl=13
+dtoverlay=i2c-gpio,bus=4,i2c_gpio_sda=8,i2c_gpio_scl=9
+dtoverlay=i2c-gpio,bus=3,i2c_gpio_sda=4,i2c_gpio_scl=5
+```
+
+Note: When using multiple software I2C buses, it's best to add the parameters from highest to lowest, i.e., 6, 5, 4, 3.