111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
#include "tca8418.h"
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#include "i2c.h"
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#include "pins.h"
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#include <stdint.h>
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#include <string.h>
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i2c_master_dev_handle_t tca8418_i2c_dev;
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KeyboardState_t keyboardState;
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void tca8418_init(void) {
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i2c_device_config_t dev_cfg = {
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.device_address = KEYBOARD_I2C_ADDRESS,
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.scl_speed_hz = 400000,
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};
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i2c_master_bus_add_device(bus, &dev_cfg, &tca8418_i2c_dev);
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i2c_write_reg(tca8418_i2c_dev, TCA8418_REG_KP_GPIO1, 0x7F);
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i2c_write_reg(tca8418_i2c_dev, TCA8418_REG_KP_GPIO2, 0xFF);
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i2c_write_reg(tca8418_i2c_dev, TCA8418_REG_KP_GPIO3, 0x00);
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i2c_write_reg(tca8418_i2c_dev, TCA8418_REG_CFG,
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TCA8418_CFG_INT_ENABLE | TCA8418_CFG_OVERFLOW_MODE);
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i2c_write_reg(tca8418_i2c_dev, TCA8418_REG_UNLOCK1, 0x00);
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i2c_write_reg(tca8418_i2c_dev, TCA8418_REG_UNLOCK2, 0x00);
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i2c_write_reg(tca8418_i2c_dev, TCA8418_REG_KP_LCK_TIMER, 0x00);
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i2c_write_reg(tca8418_i2c_dev, TCA8418_REG_INT_STAT, 0xFF);
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memset(&keyboardState, 0, sizeof(keyboardState));
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}
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int tca8418_read(uint8_t *key, uint8_t *pressed) {
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uint8_t count;
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// read event counter
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i2c_read_reg(tca8418_i2c_dev, TCA8418_REG_KEY_LCK_EC, &count);
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count &= 0x0F;
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// no pending events
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if (!count)
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return 0;
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uint8_t ev;
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// reading this register POPS one FIFO event
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i2c_read_reg(tca8418_i2c_dev, TCA8418_REG_KEY_EVENT_A, &ev);
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// bit7:
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// 0 = press
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// 1 = release
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*pressed = ((ev & 0x80) != 0);
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// lower 7 bits = key code
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*key = ev & 0x7F;
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// sanity check
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if (*key >= KEYBOARD_KEYS_COUNT)
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return 0;
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// clear ONLY key event interrupt
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i2c_write_reg(tca8418_i2c_dev, TCA8418_REG_INT_STAT, TCA8418_INT_KEY_EVENT);
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// update key state table
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keyboardState.pressedKeys[*key] = *pressed;
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// update modifier state
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switch (*key) {
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case KEYBOARD_MOD_FN:
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keyboardState.fnPressed = *pressed;
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break;
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case KEYBOARD_MOD_ALT:
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keyboardState.altPressed = *pressed;
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break;
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case KEYBOARD_MOD_CTRL:
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keyboardState.ctrlPressed = *pressed;
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break;
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case KEYBOARD_MOD_OPT:
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keyboardState.optPressed = *pressed;
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break;
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case KEYBOARD_MOD_SHIFT:
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keyboardState.shiftPressed = *pressed;
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break;
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default:
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break;
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}
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return 1;
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}
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char getKeyboardChar(const uint8_t code) {
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if (keyboardState.shiftPressed) {
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return keymap_shift[code];
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} else {
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return keymap_normal[code];
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}
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}
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const char *getKeyboardKeyName(const uint8_t code) {
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if (keyboardState.shiftPressed) {
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return keymap_shift_name[code];
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} else {
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return keymap_normal_name[code];
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}
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} |