mirror of
https://github.com/GearsProgress/Poke_Transporter_GB.git
synced 2026-03-21 17:34:42 -05:00
85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
// Created by afska https://github.com/afska/gba-link-connection
|
|
|
|
#ifndef LINK_GPIO_H
|
|
#define LINK_GPIO_H
|
|
|
|
// --------------------------------------------------------------------------
|
|
// A General Purpose Input-Output handler for the Link Port.
|
|
// --------------------------------------------------------------------------
|
|
// Usage:
|
|
// - 1) Include this header in your main.cpp file and add:
|
|
// LinkGPIO* linkGPIO = new LinkGPIO();
|
|
// - 2) Initialize the library with:
|
|
// linkGPIO->reset();
|
|
// - 3) Write pins by using:
|
|
// linkGPIO->setMode(LinkGPIO::Pin::SD, LinkGPIO::Direction::OUTPUT);
|
|
// linkGPIO->writePin(LinkGPIO::Pin::SD, true);
|
|
// - 4) Read pins by using:
|
|
// linkGPIO->setMode(LinkGPIO::Pin::SC, LinkGPIO::Direction::INPUT);
|
|
// bool isHigh = linkGPIO->readPin(LinkGPIO::Pin::SC);
|
|
// - 5) Subscribe to SI falling:
|
|
// linkGPIO->setSIInterrupts(true);
|
|
// // (when SI changes from high to low, an IRQ will be generated)
|
|
// --------------------------------------------------------------------------
|
|
// `setMode` restrictions:
|
|
// - always set the SI terminal to an input!
|
|
// --------------------------------------------------------------------------
|
|
|
|
#include <tonc_core.h>
|
|
|
|
#define LINK_GPIO_RCNT_GENERAL_PURPOSE (1 << 15)
|
|
#define LINK_GPIO_SIOCNT_GENERAL_PURPOSE 0
|
|
#define LINK_GPIO_BIT_SI_INTERRUPT 8
|
|
#define LINK_GPIO_GET(REG, BIT) ((REG >> BIT) & 1)
|
|
#define LINK_GPIO_SET(REG, BIT, DATA) \
|
|
if (DATA) \
|
|
LINK_GPIO_SET_HIGH(REG, BIT); \
|
|
else \
|
|
LINK_GPIO_SET_LOW(REG, BIT);
|
|
#define LINK_GPIO_SET_HIGH(REG, BIT) REG |= 1 << BIT
|
|
#define LINK_GPIO_SET_LOW(REG, BIT) REG &= ~(1 << BIT)
|
|
|
|
static volatile char LINK_GPIO_VERSION[] = "LinkGPIO/v5.0.2";
|
|
|
|
const u8 LINK_GPIO_DATA_BITS[] = {2, 3, 1, 0};
|
|
const u8 LINK_GPIO_DIRECTION_BITS[] = {6, 7, 5, 4};
|
|
|
|
class LinkGPIO {
|
|
public:
|
|
enum Pin { SI, SO, SD, SC };
|
|
enum Direction { INPUT, OUTPUT };
|
|
|
|
void reset() {
|
|
REG_RCNT = LINK_GPIO_RCNT_GENERAL_PURPOSE;
|
|
REG_SIOCNT = LINK_GPIO_SIOCNT_GENERAL_PURPOSE;
|
|
}
|
|
|
|
void setMode(Pin pin, Direction direction) {
|
|
if (pin == Pin::SI && Direction::OUTPUT)
|
|
return; // (disabled for safety reasons)
|
|
|
|
LINK_GPIO_SET(REG_RCNT, LINK_GPIO_DIRECTION_BITS[pin],
|
|
direction == Direction::OUTPUT);
|
|
}
|
|
|
|
Direction getMode(Pin pin) {
|
|
return Direction(LINK_GPIO_GET(REG_RCNT, LINK_GPIO_DIRECTION_BITS[pin]));
|
|
}
|
|
|
|
bool readPin(Pin pin) {
|
|
return (REG_RCNT & (1 << LINK_GPIO_DATA_BITS[pin])) != 0;
|
|
}
|
|
|
|
void writePin(Pin pin, bool isHigh) {
|
|
LINK_GPIO_SET(REG_RCNT, LINK_GPIO_DATA_BITS[pin], isHigh);
|
|
}
|
|
|
|
void setSIInterrupts(bool isEnabled) {
|
|
LINK_GPIO_SET(REG_RCNT, LINK_GPIO_BIT_SI_INTERRUPT, isEnabled);
|
|
}
|
|
};
|
|
|
|
extern LinkGPIO* linkGPIO;
|
|
|
|
#endif // LINK_GPIO_H
|