usafape
Newbie level 4
I am writing a slave spi controller and I have a counter I want to clear when CS goes high. I am getting a multi-source error. Can someone help me with a better approach? Here is my code`
Thanks
Code:
module spigpio( SPI_CLK,
SPI_CS,
SPI_MOSI,
SPI_MISO,
DEBUG
);
parameter ADDRESS_WIDTH = 8;
parameter DATA_WIDTH = 16;
input SPI_CLK, SPI_CS;
input SPI_MOSI;
output SPI_MISO;
output [4:0] DEBUG;
reg [4:0] pointer = 0;
reg [DATA_WIDTH-1:0] rs = 0;
reg rw = 0;
assign DEBUG[0] = SPI_CLK;
assign DEBUG[1] = SPI_CS;
assign DEBUG[2] = SPI_MOSI;
assign DEBUG[3] = SPI_MISO;
assign DEBUG[4] = rw;
always@(negedge SPI_CLK)
begin
if (SPI_CS == 1'b0)
begin
rs[DATA_WIDTH-1:1] <= rs[DATA_WIDTH-2:0]; //Shift data to the left
rs[0] <= SPI_MOSI; //Save new bit from MOSI
if (pointer == 0) rw <= rs[0];
pointer = pointer+1;
end
end
always@(posedge SPI_CS)
pointer <= 0;
endmoduleThanks