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Add GPIO driver

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Provide the basic functionality for setting direction, turning on and
off, toggling, reading inputs, and enabling/disabling pullups.

This chip also provides pulldowns, so in the future I will also
implement pulldown control so we can detect shorts to 5V.
This commit is contained in:
Doug Brown 2023-06-24 15:07:14 -07:00 committed by Doug Brown
parent dd4910caeb
commit 47155a7e7d
2 changed files with 150 additions and 0 deletions
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112
hal/m258ke/gpio.c Normal file
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/*
* gpio.c
*
* Created on: Jun 19, 2023
* Author: Doug
*
* Copyright (C) 2011-2023 Doug Brown
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
#include "../gpio.h"
#include "nuvoton/NuMicro.h"
/// The GPIO ports available on the M258KE
static GPIO_T * const gpioRegs[] = {
PA,
PB,
PC,
PD,
PE,
PF
};
/** Sets the direction of a GPIO pin.
*
* @param pin The pin
* @param output True if it should be an output, false if it should be an input
*/
void GPIO_SetDirection(GPIOPin pin, bool output)
{
if (output)
{
uint32_t tmp = gpioRegs[pin.port]->MODE;
tmp &= ~(2UL << 2*pin.pin);
tmp |= (1UL << 2*pin.pin);
gpioRegs[pin.port]->MODE = tmp;
}
else
{
gpioRegs[pin.port]->MODE &= ~(3UL << 2*pin.pin);
}
}
/** Sets whether an input GPIO pin is pulled up
*
* @param pin The pin
* @param pullup True if it should be pulled up, false if not
*/
void GPIO_SetPullup(GPIOPin pin, bool pullup)
{
if (pullup)
{
uint32_t tmp = gpioRegs[pin.port]->PUSEL;
tmp &= ~(2UL << 2*pin.pin);
tmp |= (1UL << 2*pin.pin);
gpioRegs[pin.port]->PUSEL = tmp;
}
else
{
gpioRegs[pin.port]->PUSEL &= ~(3UL << 2*pin.pin);
}
}
/** Turns a GPIO pin on (sets it high)
*
* @param pin The pin
*/
void GPIO_SetOn(GPIOPin pin)
{
gpioRegs[pin.port]->DOUT |= (1 << pin.pin);
}
/** Turns a GPIO pin off (sets it low)
*
* @param pin The pin
*/
void GPIO_SetOff(GPIOPin pin)
{
gpioRegs[pin.port]->DOUT &= ~(1 << pin.pin);
}
/** Toggles a GPIO pin
*
* @param pin The pin
*/
void GPIO_Toggle(GPIOPin pin)
{
gpioRegs[pin.port]->DOUT ^= (1 << pin.pin);
}
/** Reads the input status of a GPIO pin
*
* @param pin The pin
* @return True if it's high, false if it's low
*/
bool GPIO_Read(GPIOPin pin)
{
return gpioRegs[pin.port]->PIN & (1 << pin.pin);
}

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hal/m258ke/gpio_hw.h Normal file
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/*
* gpio_hw.h
*
* Created on: Jun 19, 2023
* Author: Doug
*
* Copyright (C) 2011-2023 Doug Brown
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
#ifndef HAL_M258KE_GPIO_HW_H_
#define HAL_M258KE_GPIO_HW_H_
/// Enum representing the different GPIO ports available on the M258KE.
/// Used with the GPIOPin struct.
enum {
GPIOA,
GPIOB,
GPIOC,
GPIOD,
GPIOE,
GPIOF
};
#endif /* HAL_M258KE_GPIO_HW_H_ */