From 5c83d05b493af58bb14cba9dbfc2bf2d85de2962 Mon Sep 17 00:00:00 2001
From: Olivier Ortigues <o.ortigues@gmail.com>
Date: Mon, 12 Feb 2018 23:43:40 +0100
Subject: [PATCH] esp8266/esppwm: Clip negative duty numbers to 0.

Prior to this patch a negative duty would lead to full PWM.
---
 ports/esp8266/esppwm.c | 4 ++--
 ports/esp8266/esppwm.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/ports/esp8266/esppwm.c b/ports/esp8266/esppwm.c
index f1d7060dfe..f56eafc1b6 100644
--- a/ports/esp8266/esppwm.c
+++ b/ports/esp8266/esppwm.c
@@ -210,12 +210,12 @@ pwm_start(void)
 /******************************************************************************
  * FunctionName : pwm_set_duty
  * Description  : set each channel's duty params
- * Parameters   : uint8 duty    : 0 ~ PWM_DEPTH
+ * Parameters   : int16_t duty  : 0 ~ PWM_DEPTH
  *                uint8 channel : channel index
  * Returns      : NONE
 *******************************************************************************/
 void ICACHE_FLASH_ATTR
-pwm_set_duty(uint16 duty, uint8 channel)
+pwm_set_duty(int16_t duty, uint8 channel)
 {
     uint8 i;
     for(i=0;i<pwm_channel_num;i++){
diff --git a/ports/esp8266/esppwm.h b/ports/esp8266/esppwm.h
index 1ee4a2f55a..288ef6d538 100644
--- a/ports/esp8266/esppwm.h
+++ b/ports/esp8266/esppwm.h
@@ -7,7 +7,7 @@
 void pwm_init(void);
 void pwm_start(void);
 
-void pwm_set_duty(uint16_t duty, uint8_t channel);
+void pwm_set_duty(int16_t duty, uint8_t channel);
 uint16_t pwm_get_duty(uint8_t channel);
 void pwm_set_freq(uint16_t freq, uint8_t channel);
 uint16_t pwm_get_freq(uint8_t channel);