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