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Re: How to create a GPIO driver
I use this test main:
#include <cyg/infra/diag.h>
#include <cyg/hal/var_io.h>
int main (void)
{
diag_printf("setting gpio\n");
cyg_uint32 v_led_ok = CYGHWR_HAL_LPC17XX_PIN_OUT(B, 14, OPENDRAIN, NONE,
2MHZ);
// Turn the LED on
CYGHWR_HAL_LPC17XX_GPIO_OUT(v_led_ok, 1);
// Turn the LED off
CYGHWR_HAL_LPC17XX_GPIO_OUT(v_led_ok, 0);
diag_printf("DONE\n");
while(1)
{;}
return 0;
}
and, when I compile, the compiler give me this error:
gpio.c:9: warning: implicit declaration of function
âCYGHWR_HAL_LPC17XX_GPIOâ
gpio.c:9: error: âBâ undeclared (first use in this function)
gpio.c:9: error: (Each undeclared identifier is reported only once
gpio.c:9: error: for each function it appears in.)
gpio.c:9: error: âOUT_2MHZâ undeclared (first use in this function)
gpio.c:9: error: âOUT_OPENDRAINâ undeclared (first use in this function)
make: *** [gpio.o] Error 1
what should I change?
Thanks a lot!
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