mate-net-monitor

Baseboard PCBA for MATE Net and Magnum Net power system monitoring with a Particle Boron.

GPIO Pin Usage

Pin	Function	Usage
0	SDA	-- (expansion connector)
1	SCL	-- (expansion connector)
2	D2 / SPI_SCK	-- (Mag Net activity indicator low)
3	D3 / SPI_MOSI	-- (Mag Net xcvr enable low unpopulated)
4	D4 / SPI_MISO	-- (Mag Net UART TX?)
5	D5	-- (Mag Net UART RX?)
6	D6	IRQ from MAX3100 adpt
7	D7	--
8	D8	--
9	D9 / UART1_TX	UART from MAX3100 adpt
10	D10 / UART1_RX	UART to MAX3100 adpt
11	MI	SPI to MAX3100 adpt
12	MO	SPI to MAX3100 adpt
13	SCK	SPI to MAX3100 adpt
14	A5 / SPI_SS	SPI to MAX3100 adpt
15	A4	-- (expansion connector)
16	A3	-- (expansion connector)
17	A2	-- (expansion connector)
18	A1	-- (expansion connector)
19	A0	MATE Net activity indicator high
20		--

Hardware

• pcb - main baseboard with connectors and interface circuits for MATE Net and Magnum Net
• pcb-max3100-uart-adpt - extra max3100 UART port (capable of 9N1) for MATE Net

The pcb dc-dc power supply required some rework to achieve stable operation.

Additionally, some modifications during assembly are required compared to the as-designed files here. This primarily addresses pin assignment issues:

• Mag Net is attached to pins that do not have a UART; remap these on the Boron board as the internal UART can be used for this.
• Mate Net needs a 9-bit capable UART; stack the pcb-max3100-uart-adpt on the bottom side of the pcb mainboard to add this.
  • GND, 3V3, and /IRQ on the far side need to be wired to sources on the mainboard.
  • /SHDN needs to be pulled up (via 10k) to 3V3.

Firmware

• fw-mate-net-monitor - WIP application firmware for reporting MATE inverter stats to particle cloud
• fw-test - simple hardware test firmware for burn-in testing of interfaces

Inside the fw-test folder there is a MAX3100Serial9B library extended from ewpa's MAX3100Serial with some adaptations to Particle and significant new features:

• addition of software buffers and interrupt handling for continuous stream operation
• irq, sent, read, and overflow counters
• (WIP) 9-bit read and write configuration