[PATCH] media: sharp: fix sharp encoding

From: Sean Young
Date: Fri Oct 06 2023 - 09:27:01 EST


The Sharp protocol[1] encoding has incorrect timings for bit space.

[1] https://www.sbprojects.net/knowledge/ir/sharp.php

Reported-by: Joe Ferner <joe.m.ferner@xxxxxxxxx>
Closes: https://sourceforge.net/p/lirc/mailman/message/38604507/
Signed-off-by: Sean Young <sean@xxxxxxxx>
---
drivers/media/rc/ir-sharp-decoder.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/media/rc/ir-sharp-decoder.c b/drivers/media/rc/ir-sharp-decoder.c
index 3d8488c39c56..3311099cbd57 100644
--- a/drivers/media/rc/ir-sharp-decoder.c
+++ b/drivers/media/rc/ir-sharp-decoder.c
@@ -15,7 +15,9 @@
#define SHARP_UNIT 40 /* us */
#define SHARP_BIT_PULSE (8 * SHARP_UNIT) /* 320us */
#define SHARP_BIT_0_PERIOD (25 * SHARP_UNIT) /* 1ms (680us space) */
-#define SHARP_BIT_1_PERIOD (50 * SHARP_UNIT) /* 2ms (1680ms space) */
+#define SHARP_BIT_1_PERIOD (50 * SHARP_UNIT) /* 2ms (1680us space) */
+#define SHARP_BIT_0_SPACE (17 * SHARP_UNIT) /* 680us space */
+#define SHARP_BIT_1_SPACE (42 * SHARP_UNIT) /* 1680us space */
#define SHARP_ECHO_SPACE (1000 * SHARP_UNIT) /* 40 ms */
#define SHARP_TRAILER_SPACE (125 * SHARP_UNIT) /* 5 ms (even longer) */

@@ -168,8 +170,8 @@ static const struct ir_raw_timings_pd ir_sharp_timings = {
.header_pulse = 0,
.header_space = 0,
.bit_pulse = SHARP_BIT_PULSE,
- .bit_space[0] = SHARP_BIT_0_PERIOD,
- .bit_space[1] = SHARP_BIT_1_PERIOD,
+ .bit_space[0] = SHARP_BIT_0_SPACE,
+ .bit_space[1] = SHARP_BIT_1_SPACE,
.trailer_pulse = SHARP_BIT_PULSE,
.trailer_space = SHARP_ECHO_SPACE,
.msb_first = 1,
--
2.42.0