Posted on November 24, 2017 at 21:35
This did solve my problem but I think there is a little more to this.
After reading your post I looked at theTIM_OC_InitTypeDef structure within stm32f4xx_hal_tim.h and found the declaration:
typedef struct
{
uint32_t OCMode; /*!< Specifies the TIM mode.
This parameter can be a value of @ref TIM_Output_Compare_and_PWM_modes */
uint32_t Pulse; /*!< Specifies the pulse value to be loaded into the Capture Compare Register.
This parameter can be a number between Min_Data = 0x0000U and Max_Data = 0xFFFFU */
uint32_t OCPolarity; /*!< Specifies the output polarity.
This parameter can be a value of @ref TIM_Output_Compare_Polarity */
uint32_t OCNPolarity; /*!< Specifies the complementary output polarity.
This parameter can be a value of @ref TIM_Output_Compare_N_Polarity
@note This parameter is valid only for TIM1 and TIM8. */
uint32_t OCFastMode; /*!< Specifies the Fast mode state.
This parameter can be a value of @ref TIM_Output_Fast_State
@note This parameter is valid only in PWM1 and PWM2 mode. */
uint32_t OCIdleState; /*!< Specifies the TIM Output Compare pin state during Idle state.
This parameter can be a value of @ref TIM_Output_Compare_Idle_State
@note This parameter is valid only for TIM1 and TIM8. */
uint32_t OCNIdleState; /*!< Specifies the TIM Output Compare pin state during Idle state.
This parameter can be a value of @ref TIM_Output_Compare_N_Idle_State
@note This parameter is valid only for TIM1 and TIM8. */
} TIM_OC_InitTypeDef;�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?
It looks fine but when I looked at older version of similar code I found that the
TIM_OCInitTypeDef, which is the predecessor of
TIM_OC_InitTypeDef, it used to have these two members:
TIM_OutputState
TIM_OutputNState
These two members configured the output state. The line you are referring to inside the
stm32f1xx_hal_tim.c (in my case stm32f4xx_hal_tim.c) follows a similar pattern to how the timer is initialized. First, the configuration bit in question is clearedand then configured with the appropriate using a member of the
TIM_OC_InitTypeDef structure
. Unfortunately, this 'output state' was not included in the new version of the structure and that bit was never enabled.
I do agree with you that there is no way, that I see, that the complementaryPWM output bit can be enabled. with the code the way it is.
https://community.st.com/people/dengrui.dengrui
Serious kudos to you, thanks for the catch! I've spent more than 4 hours wondering what was wrong with my code and test equipment.
Dave
