Re: [ECOS] How to create a GPIO driver

["Morris, Richard" <Richard.Morris@lifetech.com>]

Hi EnneGi,

You may want to use the CYGHWR_HAL_LPC1XXX_GPIO_SET(…), CYGHWR_HAL_LPC1XXX_GPIO_OUT(…), and CYGHWR_HAL_LPC1XXX_GPIO_IN(…) macros.
 
I have found it useful to grep the eCos code base for examples of how to use macros, etc.

For examples, you can see code that uses them here:
    ./packages/hal/cortexm/lpc1xxx/var/v3_1_33/src/lpc1xxx_misc.c
    ./packages/devs/eth/arm/lpc2xxx/v3_1_33/src/if_lpc2xxx-lwip.c


Here are the related macros for the LPC1766, found in: .../packages/hal/cortexm/lpc1xxx/var/v3_1_33/include/var_io.h:

    // This macro packs the port number, bit number and mode for a GPIO
    // pin into a single word. The packing puts the mode in the ls 8 bits,
    // the bit number in 16:20 and the GPIO port number bits 8:10. The
    // mode is only specified using the last component of the name to
    // keep definitions short.
  
    #define CYGHWR_HAL_LPC1XXX_GPIO(__port, __bit, __mode )                 \
        (((__port)<< 8)                                              |      \
         ((__bit)<<16)                                               |      \
         (CYGHWR_HAL_LPC1XXX_GPIO_MODE_##__mode)                     )

    // Macros to extract encoded values
    #define CYGHWR_HAL_LPC1XXX_GPIO_PORT(__pin)                     (((__pin)&0x00000700)>>8)
    #define CYGHWR_HAL_LPC1XXX_GPIO_BIT(__pin)                      (((__pin)>>16)&0x1F)
    #define CYGHWR_HAL_LPC1XXX_GPIO_MODE(__pin)                     ((__pin)&0xFF)

    #define CYGHWR_HAL_LPC1XXX_GPIO_NONE      (0xFFFFFFFF)

    // Functions and macros to configure GPIO ports.

    __externC void hal_lpc1xxx_gpio_set( cyg_uint32 pin );
    __externC void hal_lpc1xxx_gpio_out( cyg_uint32 pin, int val );
    __externC void hal_lpc1xxx_gpio_in ( cyg_uint32 pin, int *val );

    #define CYGHWR_HAL_LPC1XXX_GPIO_SET(__pin )        hal_lpc1xxx_gpio_set( __pin )
    #define CYGHWR_HAL_LPC1XXX_GPIO_OUT(__pin, __val ) hal_lpc1xxx_gpio_out( __pin, __val )
    #define CYGHWR_HAL_LPC1XXX_GPIO_IN(__pin,  __val ) hal_lpc1xxx_gpio_in( __pin, __val )

Hope this helps.

--Richard


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On Mar 11, 2013, at 9:52 AM, EnneGi <enricogiordano1992@gmail.com> wrote:

Thanks a lot! So, for my work, I "copy" the instruction of stm32 in the
"var_io.h" file of lpc1766 (changing adress) and define the function of GPIO
set in a file on the directory devs/ right? 



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