X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/1608665f4fd202a072531ae3a582eca87b344137..7b9b5c786c2101f5705dc81378a3ef0785fed3a6:/examples/picoproj.c

diff --git a/examples/picoproj.c b/examples/picoproj.c
index c3b199c..8503612 100644
--- a/examples/picoproj.c
+++ b/examples/picoproj.c
@@ -16,10 +16,14 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+/**
+ * @example examples/picoproj.c
+ * A minimal example to show how to use libam7xxx to display a static image.
+ */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/mman.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -32,14 +36,18 @@ static void usage(char *name)
 	printf("usage: %s [OPTIONS]\n\n", name);
 	printf("OPTIONS:\n");
 	printf("\t-f <filename>\t\tthe image file to upload\n");
-	printf("\t-F <format>\t\tthe image format to use (default is JPEG).\n");
+	printf("\t-F <format>\t\tthe image format to use (default is JPEG)\n");
 	printf("\t\t\t\tSUPPORTED FORMATS:\n");
 	printf("\t\t\t\t\t1 - JPEG\n");
-	printf("\t\t\t\t\t2 - YUV - NV12\n");
+	printf("\t\t\t\t\t2 - NV12\n");
 	printf("\t-l <log level>\t\tthe verbosity level of libam7xxx output (0-5)\n");
+	printf("\t-p <power level>\tpower level of device, between %x (off) and %x (maximum)\n", AM7XXX_POWER_OFF, AM7XXX_POWER_TURBO);
+	printf("\t\t\t\tWARNING: Level 2 and greater require the master AND\n\t\t\t\t\t the slave connector to be plugged in.\n");
 	printf("\t-W <image width>\tthe width of the image to upload\n");
 	printf("\t-H <image height>\tthe height of the image to upload\n");
 	printf("\t-h \t\t\tthis help message\n");
+	printf("\n\nEXAMPLE OF USE:\n");
+	printf("\t%s -f file.jpg -F 1 -l 5 -W 800 -H 480\n", name);
 }
 
 int main(int argc, char *argv[])
@@ -49,11 +57,12 @@ int main(int argc, char *argv[])
 	int opt;
 
 	char filename[FILENAME_MAX] = {0};
-	int image_fd;
+	FILE *image_fp;
 	struct stat st;
 	am7xxx_context *ctx;
 	am7xxx_device *dev;
 	int log_level = AM7XXX_LOG_INFO;
+	am7xxx_power_mode power_mode = AM7XXX_POWER_LOW;
 	int format = AM7XXX_IMAGE_FORMAT_JPEG;
 	int width = 800;
 	int height = 480;
@@ -61,9 +70,11 @@ int main(int argc, char *argv[])
 	unsigned int size;
 	am7xxx_device_info device_info;
 
-	while ((opt = getopt(argc, argv, "f:F:l:W:H:h")) != -1) {
+	while ((opt = getopt(argc, argv, "f:F:l:p:W:H:h")) != -1) {
 		switch (opt) {
 		case 'f':
+			if (filename[0] != '\0')
+				fprintf(stderr, "Warning: image file already specified\n");
 			strncpy(filename, optarg, FILENAME_MAX);
 			break;
 		case 'F':
@@ -87,6 +98,21 @@ int main(int argc, char *argv[])
 				log_level = AM7XXX_LOG_ERROR;
 			}
 			break;
+		case 'p':
+			power_mode = atoi(optarg);
+			switch(power_mode) {
+			case AM7XXX_POWER_OFF:
+			case AM7XXX_POWER_LOW:
+			case AM7XXX_POWER_MIDDLE:
+			case AM7XXX_POWER_HIGH:
+			case AM7XXX_POWER_TURBO:
+				fprintf(stdout, "Power mode: %x\n", power_mode);
+				break;
+			default:
+				fprintf(stderr, "Invalid power mode value, must be between %x and %x\n", AM7XXX_POWER_OFF, AM7XXX_POWER_TURBO);
+				exit(EXIT_FAILURE);
+			}
+			break;
 		case 'W':
 			width = atoi(optarg);
 			if (width < 0) {
@@ -117,31 +143,43 @@ int main(int argc, char *argv[])
 		goto out;
 	}
 
-	image_fd = open(filename, O_RDONLY);
-	if (image_fd < 0) {
-		perror("open");
+	image_fp = fopen(filename, "rb");
+	if (image_fp == NULL) {
+		perror("fopen");
 		exit_code = EXIT_FAILURE;
 		goto out;
 	}
-	if (fstat(image_fd, &st) < 0) {
+	if (fstat(fileno(image_fp), &st) < 0) {
 		perror("fstat");
 		exit_code = EXIT_FAILURE;
-		goto out_close_image_fd;
+		goto out_close_image_fp;
 	}
 	size = st.st_size;
 
-	image = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, image_fd, 0);
+	image = malloc(size * sizeof(unsigned char));
 	if (image == NULL) {
-		perror("mmap");
+		perror("malloc");
 		exit_code = EXIT_FAILURE;
-		goto out_close_image_fd;
+		goto out_close_image_fp;
+	}
+
+	ret = fread(image, size, 1, image_fp);
+	if (ret != 1) {
+		if (feof(image_fp))
+			fprintf(stderr, "Unexpected end of file.\n");
+		else if (ferror(image_fp))
+			perror("fread");
+		else
+			fprintf(stderr, "Unexpected error condition.\n");
+
+		goto out_free_image;
 	}
 
 	ret = am7xxx_init(&ctx);
 	if (ret < 0) {
 		perror("am7xxx_init");
 		exit_code = EXIT_FAILURE;
-		goto out_munmap;
+		goto out_free_image;
 	}
 
 	am7xxx_set_log_level(ctx, log_level);
@@ -170,20 +208,24 @@ int main(int argc, char *argv[])
 
 	ret = am7xxx_get_device_info(dev, &device_info);
 	if (ret < 0) {
-		perror("am7xxx_get_info");
+		perror("am7xxx_get_device_info");
 		exit_code = EXIT_FAILURE;
 		goto cleanup;
 	}
 	printf("Native resolution: %dx%d\n",
 	       device_info.native_width, device_info.native_height);
 
-	ret = am7xxx_set_power_mode(dev, AM7XXX_POWER_LOW);
+	ret = am7xxx_set_power_mode(dev, power_mode);
 	if (ret < 0) {
 		perror("am7xxx_set_power_mode");
 		exit_code = EXIT_FAILURE;
 		goto cleanup;
 	}
 
+	if ((unsigned int)width > device_info.native_width ||
+	    (unsigned int)height > device_info.native_height)
+		fprintf(stderr, "WARNING: image not fitting the native resolution, it may be displayed wrongly!\n");
+
 	ret = am7xxx_send_image(dev, format, width, height, image, size);
 	if (ret < 0) {
 		perror("am7xxx_send_image");
@@ -196,15 +238,13 @@ int main(int argc, char *argv[])
 cleanup:
 	am7xxx_shutdown(ctx);
 
-out_munmap:
-	ret = munmap(image, size);
-	if (ret < 0)
-		perror("munmap");
+out_free_image:
+	free(image);
 
-out_close_image_fd:
-	ret = close(image_fd);
-	if (ret < 0)
-		perror("close");
+out_close_image_fp:
+	ret = fclose(image_fp);
+	if (ret == EOF)
+		perror("fclose");
 
 out:
 	exit(exit_code);