X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=blobdiff_plain;f=src%2Fjtag%2Fdrivers%2Fjlink.c;h=b915707eca9f301fa7149ce5ff450c140239189b;hp=ae8ce49c68e0431ec09a37cc6bd37f66b822bcd1;hb=ba564bda6694769b95e22808982d087c779e6dd9;hpb=384e90b06b5005aa04d695b8a67c81a0af646082

diff --git a/src/jtag/drivers/jlink.c b/src/jtag/drivers/jlink.c
index ae8ce49c68..b915707eca 100644
--- a/src/jtag/drivers/jlink.c
+++ b/src/jtag/drivers/jlink.c
@@ -1270,7 +1270,7 @@ static bool calculate_swo_prescaler(unsigned int traceclkin_freq,
 		uint32_t trace_freq, uint16_t *prescaler)
 {
 	unsigned int presc = (traceclkin_freq + trace_freq / 2) / trace_freq;
-	if (presc > TPIU_ACPR_MAX_SWOSCALER)
+	if (presc == 0 || presc > TPIU_ACPR_MAX_SWOSCALER + 1)
 		return false;
 
 	/* Probe's UART speed must be within 3% of the TPIU's SWO baud rate. */
@@ -1296,7 +1296,7 @@ static bool detect_swo_freq_and_prescaler(struct jaylink_swo_speed speed,
 		*trace_freq = speed.freq / divider;
 		presc = ((1.0 - SWO_MAX_FREQ_DEV) * traceclkin_freq) / *trace_freq + 1;
 
-		if (presc > TPIU_ACPR_MAX_SWOSCALER)
+		if (presc > TPIU_ACPR_MAX_SWOSCALER + 1)
 			break;
 
 		deviation = fabs(1.0 - ((double)*trace_freq * presc / traceclkin_freq));