Hello all. I'm designing a custom IP that outputs simple number data in each cycle.
The IP has both Avalon Slave Interface and Avalon Master Slave :
The Master Interface is connected to On-Chip Memory's Avalon Slave Interface where I will store the output data in.
The Slave Interface is connected to Nios2's Avalon Master Interface.
Here, I want to write data into the custom IP, controlled on C code. I plan to use pointers like this :
| volatile int * adr = (int *) (base address of custom IP);
| adr = 0x00000001;
I believe Nios2 Processor IP handles the Interface connections so that I can manage this on C code, right?
I want to send the 32-bit data into the Custom IP, where it will store the data into it's register (reg).
The data will be used to initiate the module - work as a 'start shotting numbers' register.
What I just tried is doing it like :
| // Avalon Slave //
| output reg [31:0] s_rdata;
|
| input s_read;
| input s_write;
| input [3:0] s_addr; //slave address
| input [31:0] s_wdata; //slave writedata
|
| reg [31:0] start;
|
|
| always @(posedge clk) begin
| start <= s_wdata;
| end
|
| (later check 'if(start<=32'b1)' to initiate the module's function)
However, for some reason the data wasn't written into 'start' register.
So the question here is : How can I write to the IP's register, from C code?
I need to make the work of the IP software-controlled.
Thank you.
