Here is a list of all struct and union fields with links to the structures/unions they belong to:

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• OAR1 : I2C_TypeDef
• OAR2 : I2C_TypeDef
• Objdepth : MTP_ParamsTypedef
• Object : Symbol
• object_ptr : PTP_HandleTypeDef
• ObjectCompressedSize : PTP_ObjectInfoTypedef
• ObjectFormat : PTP_ObjectInfoTypedef
• ObjectFormatCode : MTP_ParamsTypedef
• ObjectGroup() : ObjectGroup , Symbol
• ObjectHandle : MTP_PropertiesTypedef
• ObjectHandlerNbr : MTP_ParamsTypedef
• ObjectIdentifierType() : ObjectIdentifierType
• ObjectIdentity() : ObjectIdentity , Symbol
• ObjectPropertyCode : PTP_ObjectPropDescTypeDef
• ObjectType() : ObjectType , Symbol
• OCFastMode : TIM_OC_InitTypeDef
• OCIdleState : TIM_OC_InitTypeDef , TIM_OnePulse_InitTypeDef
• OCMode : TIM_OC_InitTypeDef , TIM_OnePulse_InitTypeDef
• OCNIdleState : TIM_OC_InitTypeDef , TIM_OnePulse_InitTypeDef
• OCNPolarity : TIM_OC_InitTypeDef , TIM_OnePulse_InitTypeDef
• OCOLR : DMA2D_TypeDef
• OCPolarity : TIM_OC_InitTypeDef , TIM_OnePulse_InitTypeDef
• Octet : Symbol
• OctetStringType() : OctetStringType
• ODR : GPIO_TypeDef
• OEM_AppliID : HAL_SD_CIDTypedef
• Of : Symbol
• Off : GUI_BMP_CONTEXT , GUI_GIF_CONTEXT , GUI_JPEG_DCONTEXT
• OffData : GUI_SIF_CHARINFO , GUI_SIF_CHARINFO_EXT
• Offset : ADC_ChannelConfTypeDef
• offset : USBD_AUDIO_HandleTypeDef
• OffStateIDLEMode : TIM_BreakDeadTimeConfigTypeDef
• OffStateRunMode : TIM_BreakDeadTimeConfigTypeDef
• Oid : SnmpNode
• OidRepresentationLen : SnmpScalarNode , SnmpScalarNodeCounter64 , SnmpScalarNodeInt , SnmpScalarNodeOctetString , SnmpScalarNodeUint
• OidValueAssignment() : OidValueAssignment
• OldCode : GUI_GIF_CONTEXT
• OMAR : DMA2D_TypeDef
• OneBitSampling : SMARTCARD_InitTypeDef , UART_InitTypeDef
• onebyfftLen : arm_cfft_radix2_instance_f32 , arm_cfft_radix4_instance_f32
• OnOff : LCD_X_SETVIS_INFO
• OOR : DMA2D_TypeDef
• op_container : PTP_HandleTypeDef
• Opaque : Symbol
• OpaqueType() : OpaqueType
• OpenBracket : Symbol
• OpenParentheses : Symbol
• OperationsSupported : PTP_DeviceInfoTypedef
• OperationsSupported_len : PTP_DeviceInfoTypedef
• operator!=() : Symbol
• operator==() : Symbol
• OPFCCR : DMA2D_TypeDef
• OPTCR : FLASH_TypeDef
• OPTCR1 : FLASH_TypeDef
• OptionType : FLASH_OBProgramInitTypeDef
• OPTKEYR : FLASH_TypeDef
• OR : RTC_TypeDef , TIM_TypeDef
• OrgLock : GUI_VNC_CONTEXT
• Orientation : CONFIG_FLEXCOLOR , DRIVER_CONTEXT , GUITDRV_ADS7846_CONFIG
• OscillatorType : RCC_OscInitTypeDef
• OSPEEDR : GPIO_TypeDef
• OTYPER : GPIO_TypeDef
• OUT_ep : PCD_HandleTypeDef
• Out_MicChannels : PDMFilter_InitStruct
• OutEp : _HID_Process , _MSC_Process , CDC_DataItfTypedef
• OutEpSize : _MSC_Process , CDC_DataItfTypedef
• OutEvent : _USBD_CUSTOM_HID_Itf
• OutPipe : _HID_Process , _MSC_Process , CDC_DataItfTypedef
• OutPut : RTC_InitTypeDef
• Output_DataRate : GYRO_InitTypeDef
• OutputDataInversionMode : CRC_InitTypeDef
• OutputDrive : SAI_InitTypeDef
• OutputOffset : DMA2D_InitTypeDef
• OutputPolarity : LPTIM_InitTypeDef
• OutPutPolarity : RTC_InitTypeDef
• OutputStream : CGenerator
• OutputTerminalDesc : AUDIO_ACDescTypeDef
• OutputTerminalNum : AUDIO_ClassSpecificDescTypedef
• OutPutType : RTC_InitTypeDef
• OverrunDisable : SMARTCARD_AdvFeatureInitTypeDef , UART_AdvFeatureInitTypeDef
• OverSampling : UART_InitTypeDef , USART_InitTypeDef
• OwnAddress : CEC_InitTypeDef
• OwnAddress1 : I2C_InitTypeDef
• OwnAddress2 : I2C_InitTypeDef
• OwnAddress2Masks : I2C_InitTypeDef