This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

difficult question

matish sashal over 15 years ago

what is th eorder of presedents?

is 2 + 3 * 5 = 32 or 17

Parents

0 Cpt. Vince over 15 years ago in reply to David Lively

I searched some of my code for "32" an found many of them... along with "lots of parentheses" too!

typedef volatile unsigned long   vu32;
typedef          unsigned int    u16;

#define GPIO_MAP_PA     ( (vu32 ) 0x40010800 ) // Cortex Mapped

#define GPIOx_OFFSET_BRR  (0x14)    // Port bit reset register (GPIOx_BRR)

#define PA_BRR          ( GPIO_MAP_PA + GPIOx_OFFSET_BRR  ) // resetting individual bits

#define GPIO_Pin_0      ( (u16) 0x0001 )  /* Pin  0 selected */
#define GPIO_Pin_1      ( (u16) 0x0002 )  /* Pin  1 selected */
#define GPIO_Pin_2      ( (u16) 0x0004 )  /* Pin  2 selected */
#define GPIO_Pin_3      ( (u16) 0x0008 )  /* Pin  3 selected */
#define GPIO_Pin_4      ( (u16) 0x0010 )  /* Pin  4 selected */
#define GPIO_Pin_5      ( (u16) 0x0020 )  /* Pin  5 selected */
#define GPIO_Pin_6      ( (u16) 0x0040 )  /* Pin  6 selected */
#define GPIO_Pin_7      ( (u16) 0x0080 )  /* Pin  7 selected */
#define GPIO_Pin_8      ( (u16) 0x0100 )  /* Pin  8 selected */
#define GPIO_Pin_9      ( (u16) 0x0200 )  /* Pin  9 selected */
#define GPIO_Pin_10     ( (u16) 0x0400 )  /* Pin 10 selected */
#define GPIO_Pin_11     ( (u16) 0x0800 )  /* Pin 11 selected */
#define GPIO_Pin_12     ( (u16) 0x1000 )  /* Pin 12 selected */
#define GPIO_Pin_13     ( (u16) 0x2000 )  /* Pin 13 selected */
#define GPIO_Pin_14     ( (u16) 0x4000 )  /* Pin 14 selected */
#define GPIO_Pin_15     ( (u16) 0x8000 )  /* Pin 15 selected */
#define GPIO_Pin_All    ( (u16) 0xFFFF )  /* All pins selected */


#define PA0_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_0  )      // RESET BIT
#define PA1_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_1  )
#define PA2_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_2  )
#define PA3_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_3  )
#define PA4_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_4  )
#define PA5_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_5  )
#define PA6_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_6  )
#define PA7_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_7  )
#define PA8_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_8  )
#define PA9_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_9  )
#define PA10_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_10 )
#define PA11_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_11 )
#define PA12_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_12 )
#define PA13_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_13 )
#define PA14_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_14 )
#define PA15_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_15 )

--Cpt. Vince Foster
2nd Cannon Place
Fort Marcy Park, VA

Reply

0 Cpt. Vince over 15 years ago in reply to David Lively

I searched some of my code for "32" an found many of them... along with "lots of parentheses" too!

typedef volatile unsigned long   vu32;
typedef          unsigned int    u16;

#define GPIO_MAP_PA     ( (vu32 ) 0x40010800 ) // Cortex Mapped

#define GPIOx_OFFSET_BRR  (0x14)    // Port bit reset register (GPIOx_BRR)

#define PA_BRR          ( GPIO_MAP_PA + GPIOx_OFFSET_BRR  ) // resetting individual bits

#define GPIO_Pin_0      ( (u16) 0x0001 )  /* Pin  0 selected */
#define GPIO_Pin_1      ( (u16) 0x0002 )  /* Pin  1 selected */
#define GPIO_Pin_2      ( (u16) 0x0004 )  /* Pin  2 selected */
#define GPIO_Pin_3      ( (u16) 0x0008 )  /* Pin  3 selected */
#define GPIO_Pin_4      ( (u16) 0x0010 )  /* Pin  4 selected */
#define GPIO_Pin_5      ( (u16) 0x0020 )  /* Pin  5 selected */
#define GPIO_Pin_6      ( (u16) 0x0040 )  /* Pin  6 selected */
#define GPIO_Pin_7      ( (u16) 0x0080 )  /* Pin  7 selected */
#define GPIO_Pin_8      ( (u16) 0x0100 )  /* Pin  8 selected */
#define GPIO_Pin_9      ( (u16) 0x0200 )  /* Pin  9 selected */
#define GPIO_Pin_10     ( (u16) 0x0400 )  /* Pin 10 selected */
#define GPIO_Pin_11     ( (u16) 0x0800 )  /* Pin 11 selected */
#define GPIO_Pin_12     ( (u16) 0x1000 )  /* Pin 12 selected */
#define GPIO_Pin_13     ( (u16) 0x2000 )  /* Pin 13 selected */
#define GPIO_Pin_14     ( (u16) 0x4000 )  /* Pin 14 selected */
#define GPIO_Pin_15     ( (u16) 0x8000 )  /* Pin 15 selected */
#define GPIO_Pin_All    ( (u16) 0xFFFF )  /* All pins selected */


#define PA0_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_0  )      // RESET BIT
#define PA1_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_1  )
#define PA2_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_2  )
#define PA3_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_3  )
#define PA4_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_4  )
#define PA5_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_5  )
#define PA6_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_6  )
#define PA7_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_7  )
#define PA8_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_8  )
#define PA9_RESET   ( (*(vu32 *)PA_BRR) = GPIO_Pin_9  )
#define PA10_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_10 )
#define PA11_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_11 )
#define PA12_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_12 )
#define PA13_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_13 )
#define PA14_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_14 )
#define PA15_RESET  ( (*(vu32 *)PA_BRR) = GPIO_Pin_15 )

--Cpt. Vince Foster
2nd Cannon Place
Fort Marcy Park, VA

Children

No data