mrs-electronics-inc · brent-sink · Feb 25, 2026 · May 14, 2025 · May 16, 2025 · May 16, 2025
diff --git a/astro.config.mjs b/astro.config.mjs
@@ -49,7 +49,7 @@ export default defineConfig({
 					autogenerate: { directory: 'other' },
 				},
 			],
-			favicon: "/favicon.ico",
+			favicon: "/static/favicon.ico",
 		}),
 	],
 	image: {

diff --git a/src/content/docs/getting-started/setting-up-neuralplex.mdx b/src/content/docs/getting-started/setting-up-neuralplex.mdx
@@ -116,4 +116,27 @@ root@neuralplex:~# cd /rw_data
 
 <Aside type="tip">
 After writing files to the read/write partition, ensure to issue the **sync** command to complete the process of writing to the partition.
-</Aside>
+</Aside>
+
+### Device Tree Overlays
+To allow users to load and initialize only the perpheals that are needed, Device Tree Overlays (DTOs) are used.  DTOs enable hardware customization without the need to modify the base device tree. This flexibility is especially valuable since NeuralPlex supports multiple configurations.  However, once it has been determined what features are required for your application, it may be beneficial to bake everything into a single device tree, which will speed up the boot process a bit.
+
+To enable a device tree overlay, edit the `/boot/overlays.txt` file and append the name of the DTO to the `overlay_files=`.  DTOs must be space delimited; do not add commas or try to enter the DTOs on new lines.
+
+```bash title="/boot/overlays.txt"
+overlay_files=imx8qm-np-audio.dtbo imx8qm-np-wifi.dtbo
+```
+
+List of available DTOs:
+* imx8qm-np-audio.dtbo
+* imx8qm-np-cameras.dtbo
+* imx8qm-np-cellular-gps.dtbo
+* imx8qm-np-hdmi.dtbo
+* imx8qm-np-pci.dtbo
+* imx8qm-np-sata.dtbo
+* imx8qm-np-video0-12-3.dtbo
+* imx8qm-np-video1-12-3.dtbo
+* imx8qm-np-video2-12-3.dtbo
+* imx8qm-np-video3-12-3.dtbo
+* imx8qm-np-video2-15-6.dtbo
+* imx8qm-np-wifi.dtbo
diff --git a/src/content/docs/hardware/inputs-outputs.mdx b/src/content/docs/hardware/inputs-outputs.mdx
@@ -21,148 +21,137 @@ The NeuralPlex has a separate Vehicle Interface Processor (VIP) that is responsi
 
 ### OP Codes
 ```bash title="OP Codes"
-0x00 - NOP
-0x10 - ANALOG_INPUT_READ
-0x11 - ANALOG_INPUT_CONFIG
-0x20 - PWM_ENABLE
-0x21 - PWM_CONFIG
-0x30 - VREF_ENABLE
-0x31 - VREF_CONFIG
-0x41 - CAN_BAUD_RATE_CONFIG
-0x50 - RS232_STREAM
-0x51 - RS232_CONFIG
-0x60 - DATA_READY_DECODE
-0x61 - DATA_RECEIVE
+SPI_NOP					      0x00
+ANALOG_INPUT_READ		  0x10
+PWM_ENABLE				    0x20
+PWM_CONFIG				    0x21
+VREF_ENABLE				    0x30
+VREF_CONFIG				    0x31
+CAN_ENABLE				    0x40
+CAN_BAUD_RATE_CONFIG	0x41
+CAN_TIMEOUT				    0x42
+RS232_STREAM			    0x50
+RS232_CONFIG			    0x51
+DATA_READY_ENCODE		  0x60
+DATA_RECEIVE			    0x61
+IMX_KEEP_ALIVE			  0x70
+IMX_SHUTDOWN			    0x71
+IMX_REBOOT				    0x72
+S32K_RESET				    0x73
 ```
 
 ### Messages
 Individual messages are outlined in the protocol below.  The ID represents the OP Code, Byte 0 represents MSB. Message with ID of `0x1XY` represents the response message sent back to the SOC (master) one frame after receiving `0xXY`.  A full frame of 0's serves as a NOP to allow the SOC to receive a response without sending more data to the VIP. Response to NOP will also be a frame consisting entirely of 0's.
 
 ```bash title="spidev_test"
 # Enable PWM 1 (opcode=0x20, channel=0x01)
-$ spidev_test -D /dev/spidev0.1 -O -s 100000 -v -S 5 -p "\x20\x01\x00\x00\x00"n
+$ spidev_test -D /dev/spidev0.1 -O -s 100000 -v -S 5 -p "\x20\x01\x00\x00\x00"
 
 # Enable PWM 1 and 3 (opcode=0x20, channel=0x05)
-$ spidev_test -D /dev/spidev0.1 -O -s 100000 -v -S 5 -p "\x20\x05\x00\x00\x00"n
+$ spidev_test -D /dev/spidev0.1 -O -s 100000 -v -S 5 -p "\x20\x05\x00\x00\x00"
 ```
 
 ### SPI Protocol
 
 ```bash title="SPI_Protocol.sym"
-FormatVersion=6.0 // Do not edit this line!
+FormatVersion=5.0 // Do not edit this line!
 Title="SOC to VIP SPI Bus Protocol"
 
 {ENUMS}
-Enum=PWM_PARAMETER(0="FREQUENCY", 1="PERIOD", 2="DUTY_CYCLE")
-Enum=PARITY(0="NONE", 1="ODD", 2="EVEN", 3="MARK", 4="SPACE")
-Enum=ADC_RESOLUTION(0="10", 1="11", 2="12")
-Enum=DATA_TYPE(0="NONE", 1="STATUSES", 2="RS232", 3="RS485")
+enum PWM_PARAMETER(0="FREQUENCY", 1="DUTY_CYCLE")
+enum PARITY(0="NONE", 1="EVEN", 2="ODD")
+enum ADC_RESOLUTION(0="10", 1="11", 2="12")
+enum DATA_TYPE(0="NONE", 1="STATUSES", 2="RS232", 3="RS485")
 
 {SENDRECEIVE}
 
-[PWM_CONFIG]
-ID=021h
-Var=PWM_PARAMTER unsigned 0,2 /max:1 /e:PWM_PARAMETER
-Var=VALUE unsigned 8,24 -m /max:1
-Var=CHANNELS unsigned 4,4
+[NOP]
+ID=000h
+
+[ANALOG_INPUT_READ]
+ID=010h
+Var=ADC_CHANNEL unsigned 0,4 /max:1
+
+[ANALOG_INPUT_CONFIG]
+ID=011h
+Var=RESOLUTION unsigned 0,2 /max:1 /e:ADC_RESOLUTION
 
 [PWM_ENABLE]
 ID=020h
-Var=ENABLE unsigned 0,4 /max:1
+Var=CHANNELS unsigned 0,4
 
-[VREF_CONFIG]
-ID=031h
-Var=VALUE unsigned 0,32 -m /max:1
+[PWM_CONFIG]
+ID=021h
+Var=PWM_PARAMTER unsigned 4,2 /e:PWM_PARAMETER
+Var=VALUE unsigned 8,24 -m
+Var=CHANNELS unsigned 0,4
 
 [VREF_ENABLE]
 ID=030h
 Var=ENABLE unsigned 0,1
 
-[RS232_CONFIG]
-ID=051h
-Var=BAUD_RATE unsigned 0,5 /max:1
-Var=RS485_FLAG unsigned 7,1
-Var=BITS_PER_CHAR unsigned 8,4 /max:1
-Var=PARITY unsigned 12,3 /max:1 /e:PARITY
-Var=STOP_BITS unsigned 15,1
-
-[RS232_STREAM]
-ID=050h
-Var=TX unsigned 0,32 -m /max:1
-
-[ANALOG_INPUT_CONFIG]
-ID=011h
-Var=RESOLUTION unsigned 0,2 /max:1 /e:ADC_RESOLUTION
+[VREF_CONFIG]
+ID=031h
+Var=VALUE unsigned 0,16 -m
 
-[ANALOG_INPUT_READ]
-ID=010h
-Var=CHANNEL unsigned 0,4 /max:1
+[CAN_ENABLE]
+ID=040h
+Var=CAN_CHANNEL unsigned 0,4
 
 [CAN_BAUD_RATE_CONFIG]
 ID=041h
-Var=CHANNEL unsigned 0,4 /max:1
-Var=VALUE unsigned 8,24 -m /max:1
-
-[ANALOG_INPUT_CONFIG_Response]
-ID=111h
-Var=RESOLUTION unsigned 0,2 /max:1 /e:ADC_RESOLUTION
-
-[ANALOG_INPUT_READ_Response]
-ID=110h
-Var=CHANNEL unsigned 0,4 /max:1
-Var=VALUE unsigned 8,16 -m /max:1
-
-[CAN_BAUD_RATE_CONFIG_Response]
-ID=141h
-Var=CHANNEL unsigned 0,4 /max:1
+Var=CAN_CHANNEL unsigned 0,4 /max:1
 Var=VALUE unsigned 8,24 -m /max:1
 
-[PWM_CONFIG_Response]
-ID=121h
-Var=PWM_PARAMTER unsigned 0,2 /max:1 /e:PWM_PARAMETER
-Var=VALUE unsigned 8,24 -m /max:1
-Var=CHANNELS unsigned 4,4
+[CAN_TIMEOUT]
+ID=042h
+Var=CAN_TIMEOUT_S unsigned 8,16 /u:s
+Var=CAN_CHANNEL unsigned 0,4
 
-[PWM_ENABLE_Response]
-ID=120h
-Var=ENABLE unsigned 0,4 /max:1
+[RS232_STREAM]
+ID=050h
+Var=TX unsigned 0,32 -m /max:1
 
-[RS232_CONFIG_Response]
-ID=151h
+[RS232_CONFIG]
+ID=051h
 Var=BAUD_RATE unsigned 0,5 /max:1
 Var=RS485_FLAG unsigned 7,1
 Var=BITS_PER_CHAR unsigned 8,4 /max:1
 Var=PARITY unsigned 12,3 /max:1 /e:PARITY
 Var=STOP_BITS unsigned 15,1
 
-[RS232_STREAM_Response]
-ID=150h
-Var=TX unsigned 0,32 -m /max:1
+[DATA_READY_DECODE]
+ID=060h
 
-[VREF_CONFIG_Response]
-ID=131h
-Var=VALUE unsigned 0,32 -m /max:1
+[DATA_RECEIVE]
+ID=061h
 
-[VREF_ENABLE_Response]
-ID=130h
-Var=ENABLE unsigned 0,1
+[IMX_KEEP_ALIVE]
+ID=070h
+Var=KEEP_ALIVE unsigned 0,1
 
-[NOP]
-ID=000h
+[IMX_SHUTDOWN]
+ID=071h
+Var=IMX_SHUTDOWN unsigned 0,1
+Var=IMX_SHUTDOWN_DELAY_S unsigned 8,16 /u:s
 
-[NOP_Response]
-ID=100h
+[IMX_REBOOT]
+ID=072h
+Var=IMX_REBOOT unsigned 0,1
 
-[DATA_READY_DECODE]
-ID=060h
+[S32K_RESET]
+ID=073h
+Var=S32K_RESET unsigned 0,1
 
 [DATA_READY_DECODE_Response]
 ID=160h
 Var=DATA_TYPE unsigned 0,2 /e:DATA_TYPE
 Var=BYTES unsigned 8,8
 
-[DATA_RECEIVE]
-ID=061h
+[ANALOG_INPUT_READ_Response]
+ID=110h
+Var=ADC_CHANNEL unsigned 0,4 /max:1
+Var=VALUE unsigned 8,16 -m /max:1
 
 [DATA_RECEIVE_Response]
 ID=161h

diff --git a/src/content/docs/operating-system/multimedia.mdx b/src/content/docs/operating-system/multimedia.mdx
@@ -66,7 +66,7 @@ s7 = AMP_R
 s8 = OUT6
 
 # Record Audio
-arecord -D plughw:0,1 -r 48000 -f S32_LE sample.wav -c4
+arecord -D plughw:0,0 -r 48000 -f S32_LE sample.wav -c4
 
 # Play Audio
 aplay Sultans_Of_Swing.wav