[ECOS] Re: How to create a GPIO driver

[EnneGi <enricogiordano1992 at gmail dot com>]

Great answer! Thanks! A question: can you tell me how the function
hal_LPC1XXX_gpio_set() (and other) appear in your source? In my source this
function is described in this way:


__externC void hal_LPC17XX_gpio_set( cyg_uint32 pin )
{
    cyg_uint32 port = CYGHWR_HAL_LPC17XX_GPIO_PORT(pin);
    int bit = CYGHWR_HAL_LPC17XX_GPIO_BIT(pin);
    cyg_uint32 cm = CYGHWR_HAL_LPC17XX_GPIO_CFG(pin);
    cyg_uint32 cr;

    if( pin == CYGHWR_HAL_LPC17XX_GPIO_NONE )
        return;
    
    if( bit > 7 ) port += 4, bit -= 8;
    HAL_READ_UINT32( port, cr );
    cr &= ~(0xF<<(bit*4));
    cr |= cm<<(bit*4);
    HAL_WRITE_UINT32( port, cr );

    // If this is a pullup/down input, set the ODR bit to switch on
    // the appropriate pullup/down resistor.
    if( cm ==
(CYGHWR_HAL_LPC17XX_GPIO_MODE_IN|CYGHWR_HAL_LPC17XX_GPIO_CNF_PULL) )
    {
        cyg_uint32 odr;
        port = CYGHWR_HAL_LPC17XX_GPIO_PORT( pin );
        bit = CYGHWR_HAL_LPC17XX_GPIO_BIT(pin);
        HAL_READ_UINT32( port+CYGHWR_HAL_LPC17XX_GPIO_ODR, odr );
        if( pin & CYGHWR_HAL_LPC17XX_GPIO_PULLUP )
            odr |= (1<<bit);
        else
            odr &amp;= ~(1&lt;&lt;bit);
        HAL_WRITE_UINT32( port+CYGHWR_HAL_LPC17XX_GPIO_ODR, odr );
    }
}
    
__externC void hal_LPC17XX_gpio_out( cyg_uint32 pin, int val )
{
    cyg_uint32 port = CYGHWR_HAL_LPC17XX_GPIO_PORT(pin);
    int bit = CYGHWR_HAL_LPC17XX_GPIO_BIT(pin);
    
    port += CYGHWR_HAL_LPC17XX_GPIO_BSRR;
    if( (val&amp;1) == 0 ) port += 4;
    HAL_WRITE_UINT32( port, 1&lt;&lt;bit );
}
    
__externC void hal_LPC17XX_gpio_in ( cyg_uint32 pin, int *val )
{
    cyg_uint32 port = CYGHWR_HAL_LPC17XX_GPIO_PORT(pin);
    int bit = CYGHWR_HAL_LPC17XX_GPIO_BIT(pin);
    cyg_uint32 pd;
    
    HAL_READ_UINT32( port+CYGHWR_HAL_LPC17XX_GPIO_IDR, pd );
    *val = (pd>>bit)&1;
}




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