keyboard.h
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#ifndef ION_DEVICE_KEYBOARD_H
#define ION_DEVICE_KEYBOARD_H
#include <ion/keyboard.h>
#include <ion.h>
#include "regs/regs.h"
namespace Ion {
namespace Keyboard {
namespace Device {
/* Pin | Role | Mode
* -----+-------------------+--------------------
* PC0 | Keyboard column 1 | Input, pulled up
* PC1 | Keyboard column 2 | Input, pulled up
* PC2 | Keyboard column 3 | Input, pulled up
* PC3 | Keyboard column 4 | Input, pulled up
* PC4 | Keyboard column 5 | Input, pulled up
* PC5 | Keyboard column 6 | Input, pulled up
* PE0 | Keyboard row A | Output, open drain
* PE1 | Keyboard row B | Output, open drain
* PE2 | Keyboard row C | Output, open drain
* PE3 | Keyboard row D | Output, open drain
* PE4 | Keyboard row E | Output, open drain
* PE5 | Keyboard row F | Output, open drain
* PE6 | Keyboard row G | Output, open drain
* PE7 | Keyboard row H | Output, open drain
* PE8 | Keyboard row I | Output, open drain
*/
void init();
void shutdown();
constexpr GPIO RowGPIO = GPIOE;
constexpr uint8_t numberOfRows = 9;
constexpr uint8_t RowPins[numberOfRows] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
constexpr GPIO ColumnGPIO = GPIOC;
constexpr uint8_t numberOfColumns = 6;
constexpr uint8_t ColumnPins[numberOfColumns] = {0, 1, 2, 3, 4, 5};
inline uint8_t rowForKey(Key key) {
return (int)key/numberOfColumns;
}
inline uint8_t columnForKey(Key key) {
return (int)key%numberOfColumns;
}
inline void activateRow(uint8_t row) {
/* In open-drain mode, a 0 in the register drives the pin low, and a 1 lets
* the pin floating (Hi-Z). So we want to set the current row to zero and all
* the others to 1. */
uint16_t rowState = ~(1<<row);
// TODO: Assert pin numbers are sequentials and dynamically find 9 and 0
Device::RowGPIO.ODR()->setBitRange(9, 0, rowState);
// TODO: 100 us seems to work, but wasn't really calculated
usleep(100);
}
inline bool columnIsActive(uint8_t column) {
return !(Device::ColumnGPIO.IDR()->getBitRange(column,column));
}
}
}
}
#endif