Using '__IOM' for peripheral register definitions #3
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Is there a specific reason to not use '__IO' for peripheral register definitions instead of '__IOM' as per guidelines for versions greater than v4.2?
typedef struct { __IO uint32_t SR; /*!< ADC status register, Address offset: 0x00 */ __IO uint32_t CR1; /*!< ADC control register 1, Address offset: 0x04 */ __IO uint32_t CR2; /*!< ADC control register 2, Address offset: 0x08 */ __IO uint32_t SMPR1; /*!< ADC sample time register 1, Address offset: 0x0C */ __IO uint32_t SMPR2; /*!< ADC sample time register 2, Address offset: 0x10 */ __IO uint32_t JOFR1; /*!< ADC injected channel data offset register 1, Address offset: 0x14 */ __IO uint32_t JOFR2; /*!< ADC injected channel data offset register 2, Address offset: 0x18 */ __IO uint32_t JOFR3; /*!< ADC injected channel data offset register 3, Address offset: 0x1C */ __IO uint32_t JOFR4; /*!< ADC injected channel data offset register 4, Address offset: 0x20 */ __IO uint32_t HTR; /*!< ADC watchdog higher threshold register, Address offset: 0x24 */ __IO uint32_t LTR; /*!< ADC watchdog lower threshold register, Address offset: 0x28 */ __IO uint32_t SQR1; /*!< ADC regular sequence register 1, Address offset: 0x2C */ __IO uint32_t SQR2; /*!< ADC regular sequence register 2, Address offset: 0x30 */ __IO uint32_t SQR3; /*!< ADC regular sequence register 3, Address offset: 0x34 */ __IO uint32_t JSQR; /*!< ADC injected sequence register, Address offset: 0x38*/ __IO uint32_t JDR1; /*!< ADC injected data register 1, Address offset: 0x3C */ __IO uint32_t JDR2; /*!< ADC injected data register 2, Address offset: 0x40 */ __IO uint32_t JDR3; /*!< ADC injected data register 3, Address offset: 0x44 */ __IO uint32_t JDR4; /*!< ADC injected data register 4, Address offset: 0x48 */ __IO uint32_t DR; /*!< ADC regular data register, Address offset: 0x4C */ } ADC_TypeDef;
https://developer.arm.com/documentation/ka002980/latest
or https://github.com/ARM-software/CMSIS_5/blob/develop/CMSIS/Core/Include/core_cm4.h#L229
/* following defines should be used for structure members */ #define __IM volatile const /*! Defines 'read only' structure member permissions */ #define __OM volatile /*! Defines 'write only' structure member permissions */ #define __IOM volatile /*! Defines 'read / write' structure member permissions */
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