apps/examples/lcd_test/: add FPS calculation testcase in sample lcd app

Run lcd_test. After 5 iterations of color change test, the FPS test will start running. The FPS will be printed on logs. The screen will swith colors between red and blue very fast during the test. We are using rtc to get start and end time.

apps/examples/lcd_test/Kconfig

@@ -9,6 +9,14 @@ config EXAMPLES_LCD
 	---help---
 		Enable LCD Example
 
+if EXAMPLES_LCD
+config EXAMPLE_LCD_FPS_TEST
+	int "The Number of Frames Execution"
+	default 5000
+	---help---
+		Enter number of frames to execute to test FPS
+endif
+
 config USER_ENTRYPOINT
 	string
 	default "lcd_test" if ENTRY_LCD

apps/examples/lcd_test/example_lcd.c

@@ -52,6 +52,7 @@
 
 #include <tinyara/config.h>
 #include <tinyara/lcd/lcd_dev.h>
+#include <tinyara/rtc.h>
 #include <sys/types.h>
 #include <fcntl.h>
 #include <stdio.h>
@@ -67,10 +68,15 @@
 #define COLINDEX 10
 #define ROWINDEX 10
 #define NOPIXELS 200
-
 static int xres;
 static int yres;
 
+#ifdef CONFIG_EXAMPLE_LCD_FPS_TEST
+#define EXAMPLE_LCD_FPS_TEST CONFIG_EXAMPLE_LCD_FPS_TEST
+#else
+#define EXAMPLE_LCD_FPS_TEST 5000
+#endif
+
 static void putarea(int x1, int x2, int y1, int y2, int color)
 {
 	struct lcddev_area_s area;
@@ -204,7 +210,6 @@ static unsigned short generate_color_code(int red, int green, int blue)
 	unsigned short colorCode = (red << 11) | (green << 5) | blue;
 	return colorCode;
 }
-
 static void test_bit_map(void)
 {
 	int fd = 0;
@@ -254,13 +259,114 @@ static void test_bit_map(void)
 	free(lcd_data);
 }
 
+static void test_fps(void)
+{
+	int fd_rtc = 0;
+	int fd_lcd = 0;
+	int p = 0;
+	char port[20] = { '\0' };
+	size_t len;
+
+	fd_rtc = open("/dev/rtc0", O_RDWR);
+	if (fd_rtc < 0) {
+		printf("ERROR: LCD FPS test, Fail to open rtc.\n");
+		return;
+	}
+
+	len = xres * yres * 2 + 1;
+	uint8_t *lcd_data_red = (uint8_t *)malloc(len);
+	if (lcd_data_red == NULL) {
+		printf("FPS TEST, malloc failed for lcd data red : %d\n", len);
+		close(fd_rtc);
+		return;
+	}
+
+	uint8_t *lcd_data_blue = (uint8_t *)malloc(len);
+	if (lcd_data_blue == NULL) {
+		printf("FPS TEST, malloc failed for lcd data blue: %d\n", len);
+		free(lcd_data_red);
+		close(fd_rtc);
+		return;
+	}
+	for (int i = 0; i < len - 1; i += 2) {
+		lcd_data_red[i] = (RED & 0xFF00) >> 8;
+		lcd_data_red[i + 1] = RED & 0x00FF;
+		lcd_data_blue[i] = (BLUE & 0xFF00) >> 8;
+		lcd_data_blue[i + 1] = BLUE & 0x00FF;
+	}
+
+	struct lcddev_area_s area_red;
+	struct lcddev_area_s area_blue;
+	area_red.planeno = 0;
+	area_red.row_start = 0;
+	area_red.row_end = yres - 1;
+	area_red.col_start = 0;
+	area_red.col_end = xres - 1;
+	area_red.stride = 2 * xres;
+	area_red.data = lcd_data_red;
+	area_blue.planeno = 0;
+	area_blue.row_start = 0;
+	area_blue.row_end = yres - 1;
+	area_blue.col_start = 0;
+	area_blue.col_end = xres - 1;
+	area_blue.stride = 2 * xres;
+	area_blue.data = lcd_data_blue;
+
+	sprintf(port, LCD_DEV_PATH, p);
+	fd_lcd = open(port, O_RDWR | O_SYNC, 0666);
+	if (fd_lcd < 0) {
+		printf("ERROR: FPS TEST, Failed to open lcd port : %s error:%d\n", port, fd_lcd);
+		free(lcd_data_red);
+		free(lcd_data_blue);
+		close(fd_rtc);
+		return;
+	}
+
+	struct rtc_time start_time = RTC_TIME_INITIALIZER(1970, 1, 1, 0, 0, 0);
+	struct rtc_time end_time;
+
+	bool is_red = true;
+	//Start Test
+	ioctl(fd_rtc, RTC_RD_TIME, (unsigned long)&start_time);
+	for (int itr = 0; itr < EXAMPLE_LCD_FPS_TEST; itr++) {
+		if (is_red) {
+			ioctl(fd_lcd, LCDDEVIO_PUTAREA, (unsigned long)(uintptr_t)&area_red);
+			is_red = false;
+		} else {
+			ioctl(fd_lcd, LCDDEVIO_PUTAREA, (unsigned long)(uintptr_t)&area_blue);
+			is_red = true;
+		}
+	}
+	ioctl(fd_rtc, RTC_RD_TIME, (unsigned long)&end_time);
+	//End test
+
+	close(fd_rtc);
+	close(fd_lcd);
+	free(lcd_data_red);
+	free(lcd_data_blue);
+
+	time_t start;
+	time_t end;
+	start = mktime((FAR struct tm *)&start_time);
+	end = mktime((FAR struct tm *)&end_time);
+
+	int time_elapsed = difftime(end, start);
+	if (time_elapsed != 0) {
+		float fps = EXAMPLE_LCD_FPS_TEST / time_elapsed;
+		printf("FPS Test: %d frames executed in %d sec, FPS: %.2f\n", EXAMPLE_LCD_FPS_TEST, time_elapsed, fps);
+		return;
+	} else {
+		printf("FPS calculation failed! Please increase the number of frames execution using CONFIG_EXAMPLE_LCD_FPS_TEST!\n");
+	}
+}
+
 #ifdef CONFIG_BUILD_KERNEL
 int main(int argc, FAR char *argv[])
 #else
 int lcd_test_main(int argc, char *argv[])
 #endif
 {
-	printf("=== LCD demo ===");
+	printf("=== LCD demo ===\n");
 	int count = 0;
 	int fd = 0;
 	int p = 0;
@@ -281,5 +387,6 @@ int lcd_test_main(int argc, char *argv[])
 		count++;
 		printf("count :%d\n", count);
 	}
+	test_fps();
 	return 0;
 }