[stm32f4-ltdc] initial commit

lib/stm32/f4/ltdc.c

@@ -0,0 +1,90 @@
+/** @defgroup ltdc_file LTDC
+ *
+ * @ingroup STM32F4xx
+ *
+ * @brief <b>libopencm3 STM32F4xx LTDC</b>
+ *
+ * @version 1.0.0
+ *
+ * @author @htmlonly &copy; @endhtmlonly 2014
+ * Oliver Meier <h2obrain@gmail.com>
+ *
+ * @date 5 December 2014
+ *
+ * This library supports the LCD controller (LTDC) in the STM32F4
+ * series of ARM Cortex Microcontrollers by ST Microelectronics.
+ *
+ * For the STM32F4xx, LTDC is described in LCD-TFT Controller (LTDC)
+ * section 16 of the STM32F4xx Reference Manual (RM0090,Rev8).
+ *
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2014 Oliver Meier <h2obrain@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <libopencm3/stm32/f4/ltdc.h>
+
+
+void ltdc_set_tft_sync_timings(
+		uint16_t sync_width,    uint16_t sync_height,
+		uint16_t h_back_porch,  uint16_t v_back_porch,
+		uint16_t active_width,  uint16_t active_height,
+		uint16_t h_front_porch, uint16_t v_front_porch
+)  {
+	assert((active_width <= 0x400) && (active_height <= 0x300));
+
+	uint16_t w,h;
+	w=sync_width   -1;
+	h=sync_height  -1;
+	assert((w&0xfff == w) && (h&0x7ff == h));
+	LTDC_SSCR = (w<<16) | (h<<0);
+
+	w+=h_back_porch;
+	h+=v_back_porch;
+	assert((w&0xfff == w) && (h&0x7ff == h));
+	LTDC_BPCR = (w<<16) | (h<<0);
+
+	w+=active_width;
+	h+=active_height;
+	assert((w&0xfff == w) && (h&0x7ff == h));
+	LTDC_AWCR = (w<<16) | (h<<0);
+
+	w+=h_front_porch;
+	h+=v_front_porch;
+	assert((w&0xfff == w) && (h&0x7ff == h));
+	LTDC_TWCR = (w<<16) | (h<<0);
+}
+void ltdc_setup_windowing(
+		uint8_t  layer_number,
+		uint16_t h_back_porch,  uint16_t v_back_porch,
+		uint16_t active_width,  uint16_t active_height
+)  {
+	active_width  += h_back_porch-1;
+	active_height += v_back_porch-1;
+	assert(
+			(h_back_porch&0xfff == h_back_porch) && (v_back_porch &0xfff == v_back_porch) &&
+			(active_width&0xfff == active_width) && (active_height&0xfff == active_height)
+		);
+	LTDC_LxWHPCR(layer_number) = (active_width <<16) | (h_back_porch<<0);
+	LTDC_LxWVPCR(layer_number) = (active_height<<16) | (v_back_porch<<0);
+}
+