Read PIN input value without using gpio_read() in Iotdk about embarc_osp HOT 2 CLOSED

when you use the gpio_read function, you will finally call _lr( (unsigned)(dev->reg_base + EXT_PORTA) );//(gpio.c)
for example，PIN GPIO_8B0_3:
dev->reg_base = AR_IO_GPIO_8B0_SWPORTA_DR = 0x80017800;//(dfss_gpio_obj.c)
#define EXT_PORTA (0x50) /* GPIO External Port A Register *///(gpio.c)

so, you can do it:

uint8_t input_value = _lr(0x80017850) & (1 << 3); //pin num 3 at gpio_8b0

before read, make sure you have done the initial for pin.

from embarc_osp.

Thanks. The speed is significantly increased. But instead of using _lr, which will cause linking error (I think I just didn't include needed header files for it), we can use the below without doing any modification to include statements:

uint8_t value = _arc_aux_read(0x80017850) & (1 << 3) // read pin num 3 at gpio_8b0

from embarc_osp.