Set SPI TX/RX lengths even data is empty. Fixes #3868

tinygo-org · Aug 21, 2023 · d444983 · d444983
1 parent e3bc6da
commit d444983
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/machine/machine_nrf52xxx.go b/src/machine/machine_nrf52xxx.go
@@ -296,6 +296,8 @@ func (spi SPI) Tx(w, r []byte) error {
 			}
 			spi.Bus.RXD.MAXCNT.Set(n)
 			r = r[n:]
+		} else {
+			spi.Bus.RXD.MAXCNT.Set(0)
 		}
 		if len(w) != 0 {
 			spi.Bus.TXD.PTR.Set(uint32(uintptr(unsafe.Pointer(&w[0]))))
@@ -305,6 +307,8 @@ func (spi SPI) Tx(w, r []byte) error {
 			}
 			spi.Bus.TXD.MAXCNT.Set(n)
 			w = w[n:]
+		} else {
+			spi.Bus.TXD.MAXCNT.Set(0)
 		}
 
 		// Do the transfer.