Init

main/drivers/tca8418.c

@@ -0,0 +1,105 @@
+#include "tca8418.h"
+#include "i2c.h"
+#include "pins.h"
+#include <stdint.h>
+#include <string.h>
+
+KeyboardState_t keyboardState;
+
+void tca8418_init(void) {
+  i2c_write_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_KP_GPIO1, 0x7F);
+  i2c_write_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_KP_GPIO2, 0xFF);
+  i2c_write_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_KP_GPIO3, 0x00);
+
+  i2c_write_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_CFG,
+                TCA8418_CFG_INT_ENABLE | TCA8418_CFG_OVERFLOW_MODE);
+
+  i2c_write_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_UNLOCK1, 0x00);
+  i2c_write_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_UNLOCK2, 0x00);
+  i2c_write_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_KP_LCK_TIMER, 0x00);
+
+  i2c_write_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_INT_STAT, 0xFF);
+  memset(&keyboardState, 0, sizeof(keyboardState));
+}
+
+int tca8418_read(uint8_t *key, uint8_t *pressed) {
+  uint8_t count;
+
+  // read event counter
+  i2c_read_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_KEY_LCK_EC, &count);
+
+  count &= 0x0F;
+
+  // no pending events
+  if (!count)
+    return 0;
+
+  uint8_t ev;
+
+  // reading this register POPS one FIFO event
+  i2c_read_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_KEY_EVENT_A, &ev);
+
+  // bit7:
+  // 0 = press
+  // 1 = release
+  *pressed = ((ev & 0x80) != 0);
+
+  // lower 7 bits = key code
+  *key = ev & 0x7F;
+
+  // sanity check
+  if (*key >= KEYBOARD_KEYS_COUNT)
+    return 0;
+
+  // clear ONLY key event interrupt
+  i2c_write_reg(KEYBOARD_I2C_ADDRESS, TCA8418_REG_INT_STAT,
+                TCA8418_INT_KEY_EVENT);
+
+  // update key state table
+  keyboardState.pressedKeys[*key] = *pressed;
+
+  // update modifier state
+  switch (*key) {
+
+  case KEYBOARD_MOD_FN:
+    keyboardState.fnPressed = *pressed;
+    break;
+
+  case KEYBOARD_MOD_ALT:
+    keyboardState.altPressed = *pressed;
+    break;
+
+  case KEYBOARD_MOD_CTRL:
+    keyboardState.ctrlPressed = *pressed;
+    break;
+
+  case KEYBOARD_MOD_OPT:
+    keyboardState.optPressed = *pressed;
+    break;
+
+  case KEYBOARD_MOD_SHIFT:
+    keyboardState.shiftPressed = *pressed;
+    break;
+
+  default:
+    break;
+  }
+
+  return 1;
+}
+
+char getKeyboardChar(const uint8_t code) {
+  if (keyboardState.shiftPressed) {
+    return keymap_shift[code];
+  } else {
+    return keymap_normal[code];
+  }
+}
+
+const char *getKeyboardKeyName(const uint8_t code) {
+  if (keyboardState.shiftPressed) {
+    return keymap_shift_name[code];
+  } else {
+    return keymap_normal_name[code];
+  }
+}