I wanted to initialize memory test code in chisel 3.
I referred the code from this website (https://www.chisel-lang.org/chisel3/docs/appendix/experimental-features#loading-memories)
import chisel3._
import chisel3.util.experimental.loadMemoryFromFileInline
class InitMemInline(memoryFile: String = " My text file location ") extends Module {
val width: Int = 32
val io = IO(new Bundle {
val enable = Input(Bool())
val write = Input(Bool())
val addr = Input(UInt(10.W))
val dataIn = Input(UInt(width.W))
val dataOut = Output(UInt(width.W))
})
val mem = SyncReadMem(1024, UInt(width.W))
// Initialize memory
if (memoryFile.trim().nonEmpty) {
loadMemoryFromFileInline(mem, memoryFile)
}
io.dataOut := DontCare
when(io.enable) {
val rdwrPort = mem(io.addr)
when (io.write) { rdwrPort := io.dataIn }
.otherwise { io.dataOut := rdwrPort }
}
}
This code works well when it is compiled to verilog.
So, i thought that it also can emit number in tester code.
it should "read memory" in{
test (new InitMemInline) { c=>
c.io.enable.poke(true.B)
c.io.addr.poke(0.U)
c.clock.step(1)
c.io.dataOut.expect(1.U)
c.io.addr.poke(1.U)
c.clock.step(1)
c.io.dataOut.expect(2.U)
}
}
}
However, this test code doesn't work well.
Its output is just zero.
I want to know how to initialize chisel test code with text file.
It's seem to be a path problem. Give the path of your memory content file in tester code when you instantiate module :
//...
it should "read memory" in{
test (new InitMemInline("/the/path/to/memory.hex")) { c=>
//...
If your memory.hex is well formated it should solve the problem.