Merge pull request #3008 from bcostm/fix_pwm_nucleo-f072rb

NUCLEO_F072RB: Fix wrong timer channel number on pwm PB_5 pin

Author: sg-

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F072RB/PeripheralPins.c

@@ -116,7 +116,7 @@ const PinMap PinMap_PWM[] = {
 //  {PB_1,  PWM_1,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM1,  3, 1)},  // TIM1_CH3N
 //  {PB_3,  PWM_2,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM2,  2, 0)},  // TIM2_CH2
     {PB_4,  PWM_3,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM3,  1, 0)},  // TIM3_CH1
-    {PB_5,  PWM_3,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM3,  1, 0)},  // TIM3_CH2
+    {PB_5,  PWM_3,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM3,  2, 0)},  // TIM3_CH2
     {PB_6,  PWM_16, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM16, 1, 1)}, // TIM16_CH1N
     {PB_7,  PWM_17, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM17, 1, 1)}, // TIM17_CH1N
     {PB_8,  PWM_16, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM16, 1, 0)}, // TIM16_CH1