# MAX2771 SPI Register Test

This bare-metal application exercises the dedicated MAX2771 three-wire SPI IP
at `0x10016000`. It does not use or alter the generic PMOD SPI peripheral.

The test uses the complete default register table from the
[MAX2771 data sheet](https://www.analog.com/media/en/technical-documentation/data-sheets/max2771.pdf).
It writes registers `0x0` through `0xA`, reads each register back immediately,
then performs a second full read sweep and prints all values. Registers `0x0`
and `0x9` therefore receive the mandatory reserved-bit values required after
every MAX2771 power cycle.

Build directly:

```bash
make -C soc/software max2771-spi-test
```

Build through a board flow:

```bash
make -C targets/fpga/genesys2 software APP=max2771_spi_test
make -C targets/fpga/vcu118 software APP=max2771_spi_test
```

For a fast RAM-loaded Genesys 2 test:

```bash
make -C targets/fpga/genesys2 debug-load APP=max2771_spi_test
make -C targets/fpga/genesys2 uart-listen
```

Expected final output is:

```text
PASS,MAX2771 defaults programmed and verified
```

## EV Kit Connection

The EV kit already has a MAX32625 PICO MCU connected to `SPI_CLK`, `SPI_CSN`,
and `SPI_DATA`. Before connecting the FPGA, disconnect that controller or put
all three MCU pins in high impedance and do not run the EV kit GUI. Two active
masters on `SPI_DATA` can cause electrical contention.

Connect `SCLK`, `CSN`, the single bidirectional `SDATA`, and a common ground.
Power the EV kit according to its own guide. Do not connect the FPGA board's
PMOD power pin to an independently powered EV kit.