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/*
* Copyright 2020 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#ifndef GPIO_H
#define GPIO_H
#include <msp430.h>
class GPIO {
private:
GPIO(const GPIO ©);
public:
GPIO () {}
enum Pin : unsigned char {
p1_0 = 0, p1_1, p1_2, p1_3, p1_4, p1_5, p1_6, p1_7,
p2_0, p2_1, p2_2, p2_3, p2_4, p2_5, p2_6, p2_7,
p3_0, p3_1, p3_2, p3_3, p3_4, p3_5, p3_6, p3_7,
p4_0, p4_1, p4_2, p4_3, p4_4, p4_5, p4_6, p4_7,
pj_0, pj_1, pj_2, pj_3, pj_4, pj_5, pj_6, pj_7,
PIN_INVALID
};
/*
* Set all non-standard GPIOs to input with pull-down.
* This avoids excessive current draw due to floating inputs.
* Note that we do not set GPIOs to output low, as that might
* short-circuit other peripherals.
*/
inline void setup() {
P1DIR = BIT0; // green led
P2DIR = 0;
P3DIR = 0;
P4DIR = BIT6; // red LED
PJDIR = 0;
P1OUT = 0;
P2OUT = 0;
P3OUT = 0;
P4OUT = 0;
PJOUT = 0;
P1REN = 0xff & ~BIT0; // green LED
P2REN = 0xff & ~(BIT0 | BIT1); // UART
P3REN = 0xff;
P4REN = 0xff & ~BIT6; // red LED
PJREN = BIT6 | BIT7; // HFXT (not populated)
}
inline void led_on(unsigned char id = 0) {
if (id == 0) {
P1OUT |= BIT0;
} else {
P4OUT |= BIT6;
}
}
inline void led_off(unsigned char id = 0) {
if (id == 0) {
P1OUT &= ~BIT0;
} else {
P4OUT &= ~BIT6;
}
}
inline void led_toggle(unsigned char id = 0) {
if (id == 0) {
P1OUT ^= BIT0;
} else {
P4OUT ^= BIT6;
}
}
inline void input(unsigned char const pin) {
if (pin < p2_0) {
P1DIR &= ~(1 << pin);
P1REN &= ~(1 << pin);
} else if (pin < p3_0) {
P2DIR &= ~(1 << (pin - p2_0));
P2REN &= ~(1 << (pin - p2_0));
} else if (pin < p4_0) {
P3DIR &= ~(1 << (pin - p3_0));
P3REN &= ~(1 << (pin - p3_0));
} else if (pin < pj_0) {
P4DIR &= ~(1 << (pin - p4_0));
P4REN &= ~(1 << (pin - p4_0));
} else if (pin < PIN_INVALID) {
PJDIR &= ~(1 << (pin - pj_0));
PJREN &= ~(1 << (pin - pj_0));
}
}
inline void input(unsigned char const pin, unsigned char const pull) {
if (pin < p2_0) {
P1DIR &= ~(1 << pin);
P1OUT = pull ? (P1OUT | (1 << pin)) : (P1OUT & ~(1 << pin));
P1REN |= (1 << pin);
} else if (pin < p3_0) {
P2DIR &= ~(1 << (pin - p2_0));
P2OUT = pull ? (P2OUT | (1 << (pin - p2_0))) : (P2OUT & ~(1 << (pin - p2_0)));
P2REN |= (1 << (pin - p2_0));
} else if (pin < p4_0) {
P3DIR &= ~(1 << (pin - p3_0));
P3OUT = pull ? (P3OUT | (1 << (pin - p3_0))) : (P3OUT & ~(1 << (pin - p3_0)));
P3REN |= (1 << (pin - p3_0));
} else if (pin < pj_0) {
P4DIR &= ~(1 << (pin - p4_0));
P4OUT = pull ? (P4OUT | (1 << (pin - p4_0))) : (P4OUT & ~(1 << (pin - p4_0)));
P4REN |= (1 << (pin - p4_0));
} else if (pin < PIN_INVALID) {
PJDIR &= ~(1 << (pin - pj_0));
PJOUT = pull ? (PJOUT | (1 << (pin - pj_0))) : (PJOUT & ~(1 << (pin - pj_0)));
PJREN |= (1 << (pin - pj_0));
}
}
inline void output(unsigned char const pin) {
if (pin < p2_0) {
P1DIR |= (1 << pin);
} else if (pin < p3_0) {
P2DIR |= (1 << (pin - p2_0));
} else if (pin < p4_0) {
P3DIR |= (1 << (pin - p3_0));
} else if (pin < pj_0) {
P4DIR |= (1 << (pin - p4_0));
} else if (pin < PIN_INVALID) {
PJDIR |= (1 << (pin - pj_0));
}
}
inline void output(unsigned char const pin, unsigned char const value) {
if (pin < p2_0) {
P1OUT = value ? (P1OUT | (1 << pin)) : (P1OUT & ~(1 << pin));
P1DIR |= (1 << pin);
} else if (pin < p3_0) {
P2OUT = value ? (P2OUT | (1 << (pin - p2_0))) : (P2OUT & ~(1 << (pin - p2_0)));
P2DIR |= (1 << (pin - p2_0));
} else if (pin < p4_0) {
P3OUT = value ? (P3OUT | (1 << (pin - p3_0))) : (P3OUT & ~(1 << (pin - p3_0)));
P3DIR |= (1 << (pin - p3_0));
} else if (pin < pj_0) {
P4OUT = value ? (P4OUT | (1 << (pin - p4_0))) : (P4OUT & ~(1 << (pin - p4_0)));
P4DIR |= (1 << (pin - p4_0));
} else if (pin < PIN_INVALID) {
PJOUT = value ? (PJOUT | (1 << (pin - pj_0))) : (PJOUT & ~(1 << (pin - pj_0)));
PJDIR |= (1 << (pin - pj_0));
}
}
inline unsigned char read(unsigned char const pin) {
if (pin < p2_0) {
return P1IN & (1 << pin);
} else if (pin < p3_0) {
return P2IN & (1 << (pin - p2_0));
} else if (pin < p4_0) {
return P3IN & (1 << (pin - p3_0));
} else if (pin < pj_0) {
return P4IN & (1 << (pin - p4_0));
} else if (pin < PIN_INVALID) {
return PJIN & (1 << (pin - pj_0));
}
return 0;
}
inline void write(unsigned char const pin, unsigned char value) {
if (pin < p2_0) {
if (value) {
P1OUT |= (1 << pin);
} else {
P1OUT &= ~(1 << pin);
}
} else if (pin < p3_0) {
if (value) {
P2OUT |= (1 << (pin - p2_0));
} else {
P2OUT &= ~(1 << (pin - p2_0));
}
} else if (pin < p4_0) {
if (value) {
P3OUT |= (1 << (pin - p3_0));
} else {
P3OUT &= ~(1 << (pin - p3_0));
}
} else if (pin < pj_0) {
if (value) {
P4OUT |= (1 << (pin - p4_0));
} else {
P4OUT &= ~(1 << (pin - p4_0));
}
} else if (pin < PIN_INVALID) {
if (value) {
PJOUT |= (1 << (pin - pj_0));
} else {
PJOUT &= ~(1 << (pin - pj_0));
}
}
}
inline void write_mask(unsigned char const pin_base, unsigned char set_mask, unsigned char clear_mask) {
if (pin_base < p2_0) {
P1OUT = (P1OUT | set_mask) & ~clear_mask;
}
if (pin_base < p3_0) {
P2OUT = (P2OUT | set_mask) & ~clear_mask;
}
if (pin_base < p4_0) {
P3OUT = (P3OUT | set_mask) & ~clear_mask;
}
if (pin_base < pj_0) {
P4OUT = (P4OUT | set_mask) & ~clear_mask;
}
if (pin_base < PIN_INVALID) {
PJOUT = (PJOUT | set_mask) & ~clear_mask;
}
}
};
extern GPIO gpio;
#endif
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