tests/driver_stmpe811: add test application

tests/driver_stmpe811/Makefile

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+BOARD ?= stm32f429i-disc1
+
+include ../Makefile.tests_common
+
+USEMODULE += xtimer
+USEMODULE += stmpe811
+
+include $(RIOTBASE)/Makefile.include

tests/driver_stmpe811/README.md

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+## About
+
+This is the test application for the STMPE811 touchscreen controller.
+
+## Usage
+
+The application works out of the box on a STM32F429I-DISC1 board:
+
+```
+make -C tests/driver_stmpe811 flash term
+```
+
+## Expected output
+
+The application initializes the STMPE811 and displays "Pressed!" when a touch
+event is detected.
+Current touch positions are printed in terminal while holding the screen
+pressed.
+"Released" is displayed when the screen is released.
+
+```
+2020-02-10 10:20:17,647 # Pressed!
+2020-02-10 10:20:17,653 # X: 167, Y:81
+2020-02-10 10:20:17,659 # X: 165, Y:75
+2020-02-10 10:20:17,671 # X: 165, Y:69
+2020-02-10 10:20:17,689 # X: 166, Y:68
+2020-02-10 10:20:17,701 # X: 167, Y:68
+2020-02-10 10:20:17,713 # X: 169, Y:69
+2020-02-10 10:20:17,725 # X: 170, Y:69
+2020-02-10 10:20:17,737 # X: 170, Y:70
+2020-02-10 10:20:17,755 # X: 173, Y:69
+2020-02-10 10:20:17,761 # Released!
+```

tests/driver_stmpe811/main.c

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2019 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup tests
+ * @{
+ *
+ * @file
+ * @brief       Test application for the STMPE811 touchscreen controller
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "xtimer.h"
+
+#include "stmpe811.h"
+#include "stmpe811_params.h"
+
+static void _touch_event_cb(void *arg)
+{
+    (void)arg;
+    puts("Pressed!");
+}
+
+int main(void)
+{
+    stmpe811_t dev;
+
+    puts("STMPE811 test application\n");
+
+    printf("+------------Initializing------------+\n");
+    int ret = stmpe811_init(&dev, &stmpe811_params[0], _touch_event_cb, NULL);
+    if (ret != STMPE811_OK) {
+        puts("[Error] Initialization failed");
+        return 1;
+    }
+
+    puts("Initialization successful");
+
+    stmpe811_touch_state_t current_touch_state;
+    stmpe811_read_touch_state(&dev, &current_touch_state);
+    stmpe811_touch_state_t last_touch_state = current_touch_state;
+
+    while (1) {
+        stmpe811_read_touch_state(&dev, &current_touch_state);
+        if (current_touch_state != last_touch_state) {
+            if (current_touch_state == STMPE811_TOUCH_STATE_RELEASED) {
+                puts("Released!");
+            }
+            last_touch_state = current_touch_state;
+        }
+
+        /* Display touch position if pressed */
+        if (current_touch_state == STMPE811_TOUCH_STATE_PRESSED) {
+            stmpe811_touch_position_t position;
+            stmpe811_read_touch_position(&dev, &position);
+            printf("X: %i, Y:%i\n", position.x, position.y);
+        }
+
+        xtimer_usleep(10 * US_PER_MS);
+    }
+
+    return 0;
+}