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/*
* File : gpio.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2015, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <am33xx.h>
#include "gpio.h"
#ifdef RT_USING_PIN
#define reg(base) *(int*)(base)
#define GPIO_PIN_LOW (0x0)
#define GPIO_PIN_HIGH (0x1)
#define GPIO_CLEARDATAOUT (0x190)
#define GPIO_SETDATAOUT (0x194)
#define GPIO_DATAIN (0x138)
#define GPIO_OE (0x134)
static rt_base_t GPIO_BASE[] =
{
AM33XX_GPIO_0_REGS,
AM33XX_GPIO_1_REGS,
AM33XX_GPIO_2_REGS,
AM33XX_GPIO_3_REGS
};
static void am33xx_pin_mode(struct rt_device *device, rt_base_t pin, rt_base_t mode)
{
RT_ASSERT(pin >= 0 && pin < 128);
RT_ASSERT(mode != PIN_MODE_INPUT_PULLUP); /* Mode not supported */
rt_base_t gpiox = pin >> 5;
rt_base_t pinNumber = pin & 0x1F;
if(PIN_MODE_OUTPUT == mode)
{
reg(GPIO_BASE[gpiox] + GPIO_OE) &= ~(1 << pinNumber);
}
else if(PIN_MODE_INPUT == mode)
{
reg(GPIO_BASE[gpiox] + GPIO_OE) |= (1 << pinNumber);
}
}
static void am33xx_pin_write(struct rt_device *device, rt_base_t pin, rt_base_t value)
{
RT_ASSERT(pin >= 0 && pin < 128);
rt_base_t gpiox = pin >> 5;
rt_base_t pinNumber = pin & 0x1F;
if(GPIO_PIN_HIGH == value)
{
reg(GPIO_BASE[gpiox] + GPIO_SETDATAOUT) = (1 << pinNumber);
}
else /* GPIO_PIN_LOW */
{
reg(GPIO_BASE[gpiox] + GPIO_CLEARDATAOUT) = (1 << pinNumber);
}
}
static int am33xx_pin_read(struct rt_device *device, rt_base_t pin)
{
RT_ASSERT(pin >= 0 && pin < 128);
rt_base_t gpiox = pin >> 5;
rt_base_t pinNumber = pin & 0x1F;
return reg(GPIO_BASE[gpiox] + GPIO_DATAIN) & (1 << pinNumber) ? 1 : 0;
}
static struct rt_pin_ops am33xx_pin_ops =
{
am33xx_pin_mode,
am33xx_pin_write,
am33xx_pin_read,
};
int rt_hw_gpio_init(void)
{
rt_device_pin_register("gpio", &am33xx_pin_ops , RT_NULL);
return 0;
}
INIT_BOARD_EXPORT(rt_hw_gpio_init);
#endif
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