From a16546288e3cb569e4fd0af72a5df8b789521f12 Mon Sep 17 00:00:00 2001
From: Thomas Klaehn <thomas.klaehn@perinet.io>
Date: Fri, 18 Aug 2023 09:25:59 +0200
Subject: [PATCH] Initial commit

---
 ftdi_switch.go      | 58 +++++++++++++++++++++++++++++++++++++++++++++
 ftdi_switch_test.go | 39 ++++++++++++++++++++++++++++++
 go.mod              | 10 ++++++++
 go.sum              |  7 ++++++
 4 files changed, 114 insertions(+)
 create mode 100644 ftdi_switch.go
 create mode 100644 ftdi_switch_test.go
 create mode 100644 go.mod
 create mode 100644 go.sum

diff --git a/ftdi_switch.go b/ftdi_switch.go
new file mode 100644
index 0000000..8cf7319
--- /dev/null
+++ b/ftdi_switch.go
@@ -0,0 +1,58 @@
+package ftdi_switch
+
+import (
+	"log"
+
+	"github.com/ziutek/ftdi"
+)
+
+var (
+	logger      log.Logger = *log.Default()
+	ftdi_device *ftdi.Device
+	data_byte   byte = 0
+)
+
+func imit() {
+	logger.SetPrefix("ftdi_switch: ")
+}
+
+func start(vendor_id int, product_id int, init_value int) error {
+	var err error
+	ftdi_device, err = ftdi.OpenFirst(vendor_id, product_id, ftdi.ChannelAny)
+	if err != nil {
+		logger.Println(err)
+	}
+
+	err = ftdi_device.SetBitmode(0xff, ftdi.ModeBitbang)
+	if err != nil {
+		logger.Println(err)
+	}
+
+	err = ftdi_device.SetBaudrate(192)
+	if err != nil {
+		logger.Println(err)
+	}
+	err = write_byte(0)
+	if err != nil {
+		logger.Println(err)
+	}
+	return err
+}
+
+func stop() error {
+	return ftdi_device.Close()
+}
+
+func write_bit(bit byte, value bool) error {
+	if value {
+		data_byte |= 1 << bit
+	} else {
+		data_byte &= ^(1 << bit)
+	}
+	return ftdi_device.WriteByte(data_byte)
+}
+
+func write_byte(data byte) error {
+	data_byte = data
+	return ftdi_device.WriteByte(data_byte)
+}
diff --git a/ftdi_switch_test.go b/ftdi_switch_test.go
new file mode 100644
index 0000000..9da19ca
--- /dev/null
+++ b/ftdi_switch_test.go
@@ -0,0 +1,39 @@
+package ftdi_switch
+
+import (
+	"testing"
+
+	"gotest.tools/v3/assert"
+)
+
+const (
+	ID_VENDOR  int = 0x0403
+	ID_PRODUCT int = 0x6014
+)
+
+func TestMain(t *testing.T) {
+	logger.SetPrefix("ftdi_switch: ")
+	logger.Println("Starting")
+
+	var err error
+	err = start(ID_VENDOR, ID_PRODUCT, 0)
+	assert.NilError(t, err)
+
+	err = write_bit(3, true)
+	assert.NilError(t, err)
+
+	err = write_bit(5, true)
+	assert.NilError(t, err)
+
+	err = write_bit(6, true)
+	assert.NilError(t, err)
+
+	err = write_bit(7, true)
+	assert.NilError(t, err)
+
+	err = write_byte(0)
+	assert.NilError(t, err)
+
+	err = stop()
+	assert.NilError(t, err)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..c9aa04a
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,10 @@
+module git.blackfinn.de/solar/ftdi_switch
+
+go 1.20.0
+
+require (
+	github.com/ziutek/ftdi v0.0.1
+	gotest.tools/v3 v3.5.0
+)
+
+require github.com/google/go-cmp v0.5.9 // indirect
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..266d31e
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,7 @@
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/ziutek/ftdi v0.0.1 h1:IrFtqLisIzEfgSnuLg1suZYLkn227DTyE464XswAGK4=
+github.com/ziutek/ftdi v0.0.1/go.mod h1:fUzQhjslJJSlwoMW5Cd+0RUc8KuMDfsuZB+wfJAz1eg=
+github.com/ziutek/lcd v0.0.0-20141212131202-924f223d0903/go.mod h1:ZBCPhfHIcCtzsrXIcyEiSPDKHrjT9fXtJNKj2t1HCKw=
+gotest.tools/v3 v3.5.0 h1:Ljk6PdHdOhAb5aDMWXjDLMMhph+BpztA4v1QdqEW2eY=
+gotest.tools/v3 v3.5.0/go.mod h1:isy3WKz7GK6uNw/sbHzfKBLvlvXwUyV06n6brMxxopU=