add the missing docs

README.md

@@ -20,6 +20,6 @@ This repository specifies the control protocol implemented by [gex-core](https:/
 - [UNIT_1WIRE.md](UNIT_1WIRE.md) - 1-Wire master (thermometers, iButton...)
 - [UNIT_ADC.md](UNIT_ADC.md) - ADC with raw access, triggering, periodic capture
 - [UNIT_DAC.md](UNIT_DAC.md) - DAC with DDS
-- UNIT_PWMDIM.md - Simple PWM output
-- UNIT_TOUCH.md - Touch sense
-- UNIT_USART.md - UART/USART/RS485
+- [UNIT_PWMDIM.md](UNIT_PWMDIM.md) - Simple PWM output
+- [UNIT_TOUCH.md](UNIT_TOUCH.md) - Touch sense
+- [UNIT_USART.md](UNIT_USART.md) - UART/USART/RS485

UNIT_NEOPIXEL.md

@@ -3,10 +3,12 @@
 Implements the NeoPixel protocol for driving addressable LED strips.
 The strip length is configured in the unit settings.
 
+Five color data encodings are available for user convenience.
+
 ## Commands
 
 ### CLEAR (0x00)
-Set all pixels to black. This is automatically executed on start-up to clear the strip.
+Set all pixels to black. This is also automatically executed on start-up to clear the strip.
 
 ### LOAD (0x01)
 Load packed RGB data to the strip.
@@ -15,22 +17,33 @@ Load packed RGB data to the strip.
 
 - a byte array `(R,G,B)` x length
 
-### LOAD_U32_LE (0x02)
-Load 32-bit `0x00BBGGRR` words encoded in little-endian as `(R,G,B,0)`.
-This is more convenient for the PC script, but wastes 1/4 of the payload by padding
-null bytes.
+### LOAD_U32_ZRGB (0x08)
+Load 32-bit `0x00RRGGBB` words encoded in big-endian as `(0,R,G,B)`.
 
 *Payload:*
 
-- a byte array `(R,G,B,0)` x length
+- a byte array `(0,R,G,B)` x length
 
-### LOAD_U32_BE (0x03)
+### LOAD_U32_ZBGR (0x09)
 Load 32-bit `0x00BBGGRR` words encoded in big-endian as `(0,B,G,R)`.
 
 *Payload:*
 
 - a byte array `(0,B,G,R)` x length
 
+### LOAD_U32_RGBZ (0x0A)
+Load 32-bit `0x00BBGGRR` words encoded in little-endian as `(R,G,B,0)`.
+
+*Payload:*
+
+- a byte array `(R,G,B,0)` x length
+
+### LOAD_U32_BGRZ (0x09)
+Load 32-bit `0x00RRGGBB` words encoded in little-endian as `(B,G,R,0)`.
+
+*Payload:*
+
+- a byte array `(B,G,R,0)` x length
 
 ### GET_LEN (0x04)
 Read the neopixel strip length as configured in the settings.

UNIT_PWMDIM.md

@@ -0,0 +1,35 @@
+# PWMDIM
+
+This unit provides an up to 4-channel PWM output with shared frequency and independent duty cycles. Only one instance can be created due to using a 
+hardware timer.
+
+
+## Commands
+
+### SET_FREQUENCY (0x00)
+
+Set the PWM frequency
+
+*Request:*
+- u32 - frequency in Hz
+
+### SET_DUTY (0x01)
+
+Set the duty cycle of one or more channels
+
+*Request:*
+- repeat 1-4 times:
+  - u8 - channel number 0-3
+  - u16 - duty cycle 0-1000
+
+### STOP (0x02)
+
+Stop the hardware timer. Outputs enter low level. Has no effect if stopped.
+
+### START (0x03)
+
+Start the timer. Has no effect if running.
+
+## Events
+
+*This unit generates no events.*

UNIT_TOUCH.md

@@ -0,0 +1,71 @@
+# TOUCH
+
+Access to the hardware touch sensing controller. 
+Can be used to create capacitive touch interfaces or for rough capacitance measurement (e.g. water level in a bottle, or proximity sensing).
+
+Button mode is implemented for simple threshold checking with hystheresis.
+
+
+## Commands
+
+### READ (0x00)
+
+Read the raw touch pad values (lower indicates higher capacitance).
+Values are ordered by group and channel.
+
+*Response:*
+- u16[] - values
+
+### SET_BIN_THR (0x01)
+
+Set button mode thresholds. Value 0 = button mode disabled fro the pad.
+
+*Request:*
+- u16[] - thresholds
+
+### DISABLE_ALL_REPORTS (0x02)
+
+Set thresholds to 0, disabling the button mode for all pads.
+
+
+### SET_DEBOUNCE_TIME (0x03)
+
+Set debounce time for the button mode (replaces the value from unit settings)
+
+*Request:*
+- u16 - debounce time milliseconds
+
+
+### SET_HYSTERESIS (0x04)
+
+Set hysteresis (replaces the default value from settings)
+
+Hysteresis is added to the threshold value for the switch-off level
+(switch-off happens when the measured value is exceeded - capacitance of the pad
+drops)
+
+*Request:*
+- u16 - hystheresis
+
+
+### GET_CH_COUNT (0x0A)
+
+Get the number of enabled channels
+
+*Response:*
+- u8 - channel count
+
+
+
+## Events
+
+### BUTTON_CHANGE (0x00)
+
+The binary state of some of the capacitive pads
+with button mode enabled changed.
+
+*Payload:*
+- u32 - binary state of all channels (packed)
+- u32 - changed / trigger-generating channels (packed)
+
+

UNIT_USART.md

@@ -0,0 +1,36 @@
+# USART
+
+This unit provides access to the hardware USART peripheral. It is capable of
+driving RS485 transceivers.
+
+The unit uses asynchronous reception and transmission using DMA to support 
+low baud rates without lagging the whole platform. Reception is double-buffered 
+and sent in buffer-sized chunks. The remainder is sent when a timeout from 
+the last received byte is reached.
+
+
+## Commands
+
+### WRITE (0x00)
+
+Add data to the Tx buffer. Sending is asynchronous, but the command may wait
+for free space in the DMA buffer.
+
+*Request:*
+- u8[] - bytes to write
+
+### WRITE_SYNC (0x01)
+
+Add data to the Tx buffer and wait for the transmission to complete.
+
+*Request:*
+- u8[] - bytes to write
+
+## Events
+
+### DATA_RECEIVED (0x00)
+
+Data was received on the serial port.
+
+*Payload:*
+- u8[] - received bytes