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counter.go
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/
counter.go
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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:generate pasm -b prucounter.p
package main
import (
"log"
"time"
"github.com/aamcrae/pru"
)
func main() {
p, err := pru.Open(pru.DefaultConfig)
if err != nil {
log.Fatalf("%s", err)
}
u := p.Unit(0)
p.Order.PutUint32(u.Ram[0:], 0x00022000) // PRU 0 control registers
p.Order.PutUint32(u.Ram[4:], 0) // Saved cycles value
p.Order.PutUint32(u.Ram[8:], 0) // Saved stalls value
err = u.LoadAndRunFile("prucounter.bin")
if err != nil {
log.Fatalf("%s", err)
}
time.Sleep(time.Second)
log.Printf("Cycles are %d (202 expected), stalls = %d", p.Order.Uint32(u.Ram[4:]), p.Order.Uint32(u.Ram[8:]))
p.Close()
}