diff --git a/examples/stm32/f1/stm32-h103/traceswo/traceswo.c b/examples/stm32/f1/stm32-h103/traceswo/traceswo.c
index 41f28f7..00f74ba 100644
--- a/examples/stm32/f1/stm32-h103/traceswo/traceswo.c
+++ b/examples/stm32/f1/stm32-h103/traceswo/traceswo.c
@@ -42,9 +42,6 @@ static void trace_setup(void)
 	TPIU_SPPR = TPIU_SPPR_ASYNC_MANCHESTER;
 	TPIU_ACPR = 7;
 
-	/* Data width is 1 byte. */
-	TPIU_CSPSR = TPIU_CSPSR_BYTE;
-
 	/* Formatter and flush control. */
 	TPIU_FFCR &= ~TPIU_FFCR_ENFCONT;
 
@@ -70,10 +67,10 @@ static void gpio_setup(void)
 
 static void trace_send_blocking(char c)
 {
-	while (!(ITM_STIM[0] & ITM_STIM_FIFOREADY))
+	while (!(ITM_STIM8(0) & ITM_STIM_FIFOREADY))
 		;
 
-	ITM_STIM[0] = c;
+	ITM_STIM8(0) = c;
 }
 
 int main(void)
diff --git a/libopencm3 b/libopencm3
index f4cd74a..fe6b542 160000
--- a/libopencm3
+++ b/libopencm3
@@ -1 +1 @@
-Subproject commit f4cd74a741084decb805d8dd15253f77f404ad24
+Subproject commit fe6b542357c7018b5a528bc7adba1079c3bb57eb