ARM技术资料实例代码

主流ARM的实例代码 void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function) { unsigned long base = S3C2410_GPIO_BASE(pin); unsigned long mask; unsigned long con; unsigned long flags; if(pin<S3C2410_GPIO_BANKB) mask=1<<S3C2410_GPIO_OFFSET(pin); else mask =3<< (S3C2410_GPIO_OFFSET(pin)*2); local_irq_save(flags); con = __raw_readl(base + 0x00); con &= ~mask; con |= function; __raw_writel(con, base + 0x00); local_irq_restore(flags); } void s3c2410_gpio_setpin(unsigned int pin, unsigned int to) { unsigned long base = S3C2410_GPIO_BASE(pin); unsigned long offs = S3C2410_GPIO_OFFSET(pin); unsigned long flags; unsigned long dat; local_irq_save(flags); dat = __raw_readl(base + 0x04); dat &= ~(1 << offs); dat |= to << offs; __raw_writel(dat, base + 0x04); local_irq_restore(flags); }