1 files changed, 280 insertions, 0 deletions
diff --git a/src/ql570.c b/src/ql570.c
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index 0000000..e642f91
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+++ b/src/ql570.c
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+/* ql570.c: facilities for communicating with the QL-570 label printer
+ *
+ * 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"
+
+/**
+ * Request status from printer.
+ *
+ * @param device file descriptor to write to
+ */
+void
+ql_status_request(FILE *device)
+{
+	uint8_t request[3] = {QL_ESC, 0x69, 0x53};
+	fwrite(request, 3, 1, device);
+	fflush(device);
+}
+
+/**
+ * Read a status response from the printer.
+ *
+ * @param status ql_status struct holding the response
+ * @param device file descriptor to write to
+ * @return true if successful, false if short read
+ */
+bool
+ql_status_read(ql_status *status, FILE *device)
+{
+	size_t len = fread(status, sizeof(ql_status), 1, device);
+
+	if (len != sizeof(ql_status)) {
+		return false;
+	}
+
+	return true;
+}
+
+/**
+ * Initialise printer.
+ *
+ * The protocol specification has an optional recommendation to flush lingering
+ * partial commands with 200 bytes of 0x00.
+ *
+ * @param flush prepend 200 bytes of invalid (0x00) data
+ * @param device file descriptor to write to
+ */
+void
+ql_init(bool flush, FILE *device)
+{
+	if (flush) {
+		uint8_t init_buffer[200];
+		memset(&init_buffer, 0x0, 200);
+		fwrite(init_buffer, sizeof(uint8_t), 200, device);
+		fflush(device);
+	}
+
+	uint8_t request[2] = {QL_ESC, 0x40};
+	fwrite(request, 2, 1, device);
+	fflush(device);
+}
+
+/**
+ * Write one line of raster data to the printer.
+ *
+ * For most printers in the QL series one raster line is at most 90 bytes long.
+ * As these are monochrome printers this means a line has 720 pixels (at most).
+ *
+ * @param length length of the raster data
+ * @param data pointer to the raster data
+ * @param device file descriptor to write to
+ */
+void
+ql_raster(uint8_t length, uint8_t *data, FILE *device)
+{
+	uint8_t request[3] = {0x67, 0x00, length};
+	fwrite(request, 3, 1, device);
+	fwrite(data, length, 1, device);
+	fflush(device);
+}
+
+/**
+ * Signal end of raster data.
+ *
+ * @param length length of raster data (0x00)
+ * @param device file descriptor to write to
+ */
+void
+ql_raster_end(uint8_t length, FILE *device)
+{
+	uint8_t request[3] = {0x67, 0xFF, length};
+
+	uint8_t data[length];
+	memset(&data, 0x00, length);
+
+	fwrite(request, 3, 1, device);
+	fwrite(data, length, 1, device);
+
+	fflush(device);
+}
+
+/**
+ * Start a new page.
+ *
+ * This will write out the contents of the print_info pointer to the printer.
+ *
+ * @param print_info print_info
+ * @param device file descriptor to write to
+ */
+void
+ql_page_start(ql_print_info *print_info, FILE *device)
+{
+	uint8_t request[3] = {QL_ESC, 0x69, 0x7A};
+	fwrite(request, 3, 1, device);
+	fwrite(print_info, sizeof(ql_print_info), 1, device);
+	fflush(device);
+}
+
+/**
+ * End the current page.
+ *
+ * @param last_page indicate that this is the last page
+ * @param device file descriptor to write to
+ */
+void
+ql_page_end(bool last_page, FILE *device)
+{
+	uint8_t request;
+
+	if (last_page) {
+		request = 0x1A;
+	} else {
+		request = 0x0C;
+	}
+
+	fwrite(&request, 1, 1, device);
+	fflush(device);
+}
+
+
+/**
+ * Set extended options.
+ *
+ * This is called 'set expanded mode' in the specification.
+ *
+ * ### Cutting
+ *
+ * Pain points with the specification:
+ *
+ * * The diagram is wrong. The description says, this is bit 3, the diagram
+ *   says, this is bit 4. This cost me some time.
+ *   TODO: Check 720N/NW. The documentation there lacks the diagram and the
+ *   description sys it is bit 4. I bet this is wrong!
+ * * Not cutting is the default. The description says that 'cut at end' is the
+ *   default.
+ *
+ * TODO: This seems to cut after each page, regardless of whether last_page is
+ * set. I don't get it.
+ *
+ * ### High resolution printing
+ *
+ * Note that this is the resolution along the label _length_. The resolution
+ * along the _width_ of the media will stay the same. This means that more
+ * lines will be squeezed in the same space.
+ *
+ * Selecting high resolution printing, will allow the shortest label produced
+ * to be shrunk from 12.7mm to 6.35mm. The minimum label length is 150 lines,
+ * doubling the resolution will halve the length.
+ *
+ * @param cut_at_end
+ * @param high_resolution false: 300x300 dpi, true: 300x600 dpi
+ * @param device file descriptor to write to
+ */
+void
+ql_set_extended_options(bool cut_at_end, bool high_resolution, FILE *device)
+{
+	uint8_t options = 0x00;
+
+	if (cut_at_end)
+		options |= OPT_CUT_AT_END;
+
+	if (high_resolution)
+		options |= OPT_HIGH_RESOLUTION;
+
+	uint8_t request[4] = {QL_ESC, 0x69, 0x4B, options};
+	fwrite(request, 4, 1, device);
+	fflush(device);
+}
+
+/**
+ * Enable automatic label cutting.
+ *
+ * The specification calls this "set each mode". The bits of the last byte in
+ * the command sequence are either described as unused or undefined, setting
+ * bit 6 enables auto cut.
+ *
+ * @param device file descriptor to write to
+ */
+void
+ql_autocut_enable(FILE *device)
+{
+	uint8_t request[4] = {QL_ESC, 0x69, 0x4D, 0b01000000};
+	fwrite(request, 4, 1, device);
+	fflush(device);
+}
+
+/**
+ * Cut after each _n_ labels.
+ *
+ * For continuous length labels it makes sense to cut after every page. For 
+ * other label types it might make sense to cut after several labels.
+ *
+ * TODO: default is 1, does that work? If yes, note here
+ *
+ * @param interval cut after _interval_ number of pages
+ * @param device file descriptor to write to
+ */
+void
+ql_autocut_interval(uint8_t interval, FILE *device)
+{
+	uint8_t request[4] = {QL_ESC, 0x69, 0x41, interval};
+	fwrite(request, 4, 1, device);
+	fflush(device);
+}
+
+/**
+ * Sets the default margins.
+ *
+ * The specification recommends setting the margins to 35 for several printer
+ * types, including the QL-570. For other types this is not indicated. Setting
+ * this seems to be optional.
+ *
+ * If the media is 'die cut', then the margins will always be 0.
+ *
+ * See ql_set_margins for details.
+ *
+ * @param
+ * @param device file descriptor to write to
+ *
+ */
+void
+ql_set_default_margins(enum ql_media_type media_type, FILE *device)
+{
+	if (media_type == MT_CONTINUOUS)
+		ql_set_margins(35, device);
+	else
+		ql_set_margins(0, device);
+}
+
+/**
+ * Set margins on continuous tape.
+ *
+ * This adds _margins_ amount of blank lines before and after the label.
+ *
+ * @param margins number of blank lines
+ * @param device file descriptor to write to
+ */
+void
+ql_set_margins(uint16_t margins, FILE *device)
+{
+	uint8_t request[5] = {QL_ESC, 0x69, 0x64, margins & 0x00FF, (margins & 0xFF00) >> 8};
+	fwrite(request, 5, 1, device);
+	fflush(device);
+}