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Queue the FTDI test reply at the JTAG call. #71

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Merged
jon merged 1 commit into from
Sep 20, 2026
Merged

Queue the FTDI test reply at the JTAG call. #71

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18 changes: 16 additions & 2 deletions ftdi/wire_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,7 @@ func TestJTAGSetsDirectionsBeforeFirstHighTMS(t *testing.T) {
}

func TestWireMethodsShareEndpoint(t *testing.T) {
raw := &fakeUSBDevice{readData: [][]byte{{0x01, 0x60, 0x80}}}
raw := &fakeUSBDevice{}
c, err := newChannel(raw, Config{Port: PortA, MaxClockHz: 100_000})
if err != nil {
t.Fatal(err)
Expand All @@ -51,9 +51,23 @@ func TestWireMethodsShareEndpoint(t *testing.T) {
if _, err := c.SWDIO(t.Context(), []byte{1}, []byte{0}, 1); err != nil {
t.Fatal(err)
}
if _, err := c.JTAGIO(t.Context(), []byte{1}, []byte{0}, 1); err != nil {
raw.mu.Lock()
reads := raw.readsN
raw.mu.Unlock()
if reads != 0 {
t.Fatalf("write-only SWD completed %d USB reads", reads)
}
// The fake releases queued replies on the next USB write.
raw.mu.Lock()
raw.readData = [][]byte{{0x01, 0x60, 0x80}}
raw.mu.Unlock()
got, err := c.JTAGIO(t.Context(), []byte{1}, []byte{0}, 1)
if err != nil {
t.Fatal(err)
}
if len(got) != 1 || got[0] != 1 {
t.Fatalf("JTAG sample = %x, want 01", got)
}
if _, err := c.SWDIO(t.Context(), []byte{1}, []byte{0}, 1); err != nil {
t.Fatal(err)
}
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