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Switch FIR from UInt -> FixedPoint

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This commit is contained in:
Paul Rigge
2020-04-30 10:51:32 -07:00
parent 35cba5dfae
commit 0cc643bfdb
3 changed files with 38 additions and 18 deletions
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2
generators/chipyard/src/main/scala/DigitalTop.scala
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@@ -22,6 +22,8 @@ class DigitalTop(implicit p: Parameters) extends System
with icenet.CanHavePeripheryIceNIC // Enables optionally adding the IceNIC for FireSim
with chipyard.example.CanHavePeripheryInitZero // Enables optionally adding the initzero example widget
with chipyard.example.CanHavePeripheryGCD // Enables optionally adding the GCD example widget
with chipyard.example.CanHavePeripheryUIntTestFIR // Enables optionally adding the FIR example widget
with chipyard.example.CanHavePeripheryUIntStreamingPassthrough // Enables optionally adding the passthrough example widget
{
override lazy val module = new DigitalTopModule(this)
}

8
generators/chipyard/src/main/scala/example/dsptools/GenericFIR.scala
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@@ -3,7 +3,7 @@
package chipyard.example
import chisel3._
import chisel3.{Bundle, Module}
import chisel3.experimental.FixedPoint
import chisel3.util._
import dspblocks._
import dsptools.numbers._
@@ -204,7 +204,11 @@ class TLGenericFIRChain[T<:Data:Ring] (genIn: T, genOut: T, coeffs: Seq[T], para
trait CanHavePeripheryUIntTestFIR extends BaseSubsystem {
val fir = p(GenericFIRKey) match {
case Some(params) => {
val fir = LazyModule(new TLGenericFIRChain(UInt(8.W), UInt(12.W), Seq(1.U, 2.U, 3.U), params))
val fir = LazyModule(new TLGenericFIRChain(
genIn = FixedPoint(8.W, 3.BP),
genOut = FixedPoint(8.W, 3.BP),
coeffs = Seq(1.F(0.BP), 2.F(0.BP), 3.F(0.BP)),
params = params))
pbus.toVariableWidthSlave(Some("firWrite")) { fir.writeQueue.mem.get }
pbus.toVariableWidthSlave(Some("firRead")) { fir.readQueue.mem.get }

28
tests/fir.c
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@@ -3,6 +3,9 @@
#define PASSTHROUGH_READ 0x2100
#define PASSTHROUGH_READ_COUNT 0x2108
#define BP 3
#define BP_SCALE ((double)(1 << BP))
#include "mmio.h"
#include <stdio.h>
@@ -10,14 +13,23 @@
#include <string.h>
#include <stdint.h>
uint64_t roundi(double x)
{
if (x < 0.0) {
return (uint64_t)(x - 0.5);
} else {
return (uint64_t)(x + 0.5);
}
}
int main(void)
{
printf("Starting writing\n");
uint32_t num_tests = 15;
uint32_t test_vector[15] = {1, 2, 3, 4, 5, 4, 3, 2, 1, 5, 4, 3, 2, 1, 2};
double test_vector[15] = {1.0, 2.0, 3.0, 4.0, 5.0, 4.0, 3.0, 2.0, 1.0, 0.5, 0.25, 0.125, 0.125};
uint32_t num_tests = sizeof(test_vector) / sizeof(double);
printf("Starting writing %d inputs\n", num_tests);
for (int i = 0; i < num_tests; i++) {
reg_write64(PASSTHROUGH_WRITE, test_vector[i]);
reg_write64(PASSTHROUGH_WRITE, roundi(test_vector[i] * BP_SCALE));
}
printf("Done writing\n");
@@ -29,12 +41,14 @@ int main(void)
if (rcnt != 0) {
for (int i = 0; i < num_tests - 3; i++) {
uint32_t res = reg_read32(PASSTHROUGH_READ);
uint32_t expected = 3*test_vector[i] + 2*test_vector[i+1] + test_vector[i+2];
// double res = ((double)reg_read32(PASSTHROUGH_READ)) / BP_SCALE;
double expected_double = 3*test_vector[i] + 2*test_vector[i+1] + test_vector[i+2];
uint32_t expected = ((uint32_t)(expected_double * BP_SCALE + 0.5)) & 0xFF;
if (res == expected) {
printf("\n\nPass: Got %d Expected %d\n\n", res, expected);
printf("\n\nPass: Got %u Expected %u\n\n", res, expected);
} else {
failed = 1;
printf("\n\nFail: Got %d Expected %d\n\n", res, expected);
printf("\n\nFail: Got %u Expected %u\n\n", res, expected);
}
}
} else {