Add firmware for the left keyboard half.

left/main.c

@@ -0,0 +1,44 @@
+#include "board.h"
+#include "fsl_clock_manager.h"
+
+int main(void)
+{
+    gpio_input_pin_user_config_t inputPin[] =
+    {
+        {
+            .pinName                       = BOARD_SW_GPIO,
+            .config.isPullEnable           = true,
+            .config.pullSelect             = kPortPullUp,
+            .config.isPassiveFilterEnabled = false,
+            .config.interrupt              = kPortIntDisabled,
+        },
+        {
+            .pinName = GPIO_PINS_OUT_OF_RANGE,
+        }
+    };
+
+    gpio_output_pin_user_config_t outputPin[] =
+    {
+        {
+            .pinName              = kGpioLED1,
+            .config.outputLogic   = 0,
+            .config.slewRate      = kPortFastSlewRate,
+            .config.driveStrength = kPortHighDriveStrength,
+        },
+        {
+            .pinName = GPIO_PINS_OUT_OF_RANGE,
+        }
+    };
+
+    CLOCK_SYS_EnablePortClock(PORTA_IDX);
+    CLOCK_SYS_EnablePortClock(PORTB_IDX);
+
+    BOARD_ClockInit();
+
+    GPIO_DRV_Init(inputPin, outputPin);
+
+    while (1) {
+        uint8_t isSwitchPressed = GPIO_DRV_ReadPinInput(BOARD_SW_GPIO);
+        GPIO_DRV_WritePinOutput(kGpioLED1, isSwitchPressed);
+    }
+}