spi/tests/spi_write_read.v

/* (c) Peter McGoron 2022
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v.2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

module spi_write_read
#(
	parameter POLARITY = 0,
	parameter PHASE = 0
)
(
	input clk,
	input [23:0] data_ctrl,
	input activate,
	input ss,
	input rdy,
	output master_finished
);

wire miso;
wire mosi;
wire sck;
wire ss_L = !ss;

reg [23:0] from_slave_data;
reg slave_finished;
reg slave_error;

spi_master
#(
	.POLARITY(POLARITY),
	.PHASE(PHASE)
) master (
	.clk(clk),
	.to_slave(data_ctrl),
	.from_slave(from_slave_data),
	.miso(miso),
	.mosi(mosi),
	.sck_wire(sck),
	.finished(master_finished),
	.arm(activate)
);

reg [23:0] data_from_master;
reg [23:0] data_to_master = 24'b111011011100010101010101;

spi_slave #(
	.POLARITY(POLARITY),
	.PHASE(PHASE)
) slave (
	.clk(clk),
	.sck(sck),
	.ss_L(ss_L),
	.from_master(data_from_master),
	.to_master(data_to_master),
	.mosi(mosi),
	.miso(miso),
	.finished(slave_finished),
	.rdy(rdy),
	.err(slave_error)
);

always @ (posedge clk) begin
	if (slave_finished) begin
		data_to_master <= data_from_master;
	end
end

endmodule