From 18838e644f1149db333c5ee441e025ba4b89283f Mon Sep 17 00:00:00 2001
From: Clemens Fries <github-raster@xenoworld.de>
Date: Sat, 18 Jul 2015 23:33:23 +0200
Subject: Moved code and documentation from landfill to tidy repository.

---
 src/examples/minimal.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/examples/minimal.c

(limited to 'src/examples/minimal.c')

diff --git a/src/examples/minimal.c b/src/examples/minimal.c
new file mode 100644
index 0000000..5550e9e
--- /dev/null
+++ b/src/examples/minimal.c
@@ -0,0 +1,119 @@
+/* minimal.c: a minmal example for using the QL-570 utility functions
+ *
+ * Copyright (C) 2015 Clemens Fries <github-raster@xenoworld.de>
+ *
+ * This file is part of rastertoql570.
+ *
+ * rastertoql570 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * rastertoql570 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with rastertoql570.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../ql570.h"
+
+/**
+ * Raster line length for the QL-570 is 90 bytes. There are some other QL
+ * series printers that need a larger buffer.
+ */
+#define BUFFER_SIZE 90
+
+/**
+ * Minimal example program for direct printer access.
+ *
+ * For a better understanding of what goes on here, please refer
+ * to the documentation of each function. At times there are
+ * interesting bits of information over there.
+ *
+ */
+int main()
+{
+	FILE *device = fopen("/dev/usb/lp0", "wb");
+	ql_status status = {0};
+	uint8_t buffer[BUFFER_SIZE];
+
+	/*
+	 * Request a print job with 150 lines (the minimal amount of lines for
+	 * the QL-570). Note that this number is mandatory. If you print less
+	 * than 150 lines, or indicate some wrong amount of lines here, the
+	 * printer will just resort to blinking its red LED while observing you
+	 * with displeasure.
+	 */
+	ql_print_info print_info = { .raster_number[0] = 150 };
+
+	/*
+	 * Initialise printer. The first flag indicates that we won't be
+	 * flushing the printer with 200 bytes of zeroes.
+	 */
+	ql_init(false, device);
+
+	/*
+	 * Ask the printer to give us a status report.
+	 */
+	ql_status_request(device);
+
+	/*
+	 * Retrieve the status report.
+	 */
+	ql_status_read(&status, device);
+
+	/*
+	 * Send the contents of `print_info` to the printer.
+	 */
+	ql_page_start(&print_info, device);
+
+	/*
+	 * Set some extended options: cut-at-end plus 300dpi printing.
+	 */
+	ql_set_extended_options(true, false, device);
+	
+	/*
+	 * Print some black lines.
+	 */
+	for (int i = 0; i < 150; i++) {
+
+		/*
+		 * Every now and then: Many, many 1s.
+		 */
+	        memset(buffer, i % 5 == 0 ? 0xFF : 0x00, BUFFER_SIZE);
+
+		/*
+		 * We empty the first two bytes in order to force a small
+		 * margin. Note that for 62mm the right and left margin is
+		 * about 12 dots. I observed that I have a margin any way on
+		 * one side, but it looks like it is printing outside the label
+		 * area on the other side. It's not that important, but I do
+		 * it anyway because I'm not sure about the mechanics and how
+		 * well the print heads cope with doing their thing outside
+		 * the printable area.
+		 *
+		 */
+		buffer[0] = 0x00;
+		buffer[1] = 0x00;
+
+		/*
+		 * Send this raster line to the printer.
+		 */
+	        ql_raster(BUFFER_SIZE, buffer, device);
+	}
+	
+	/*
+	 * Indicate the end of raster data to the printer.
+	 */
+	ql_raster_end(BUFFER_SIZE, device);
+
+	/*
+	 * Tell it that this was the last page.
+	 */
+	ql_page_end(true, device);
+
+	fclose(device);
+}
-- 
cgit