diff options
Diffstat (limited to 'demos/3rdparty/tdisp_f4_discovery/tdisp_lld_board.h')
| -rw-r--r-- | demos/3rdparty/tdisp_f4_discovery/tdisp_lld_board.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/demos/3rdparty/tdisp_f4_discovery/tdisp_lld_board.h b/demos/3rdparty/tdisp_f4_discovery/tdisp_lld_board.h new file mode 100644 index 00000000..d839d302 --- /dev/null +++ b/demos/3rdparty/tdisp_f4_discovery/tdisp_lld_board.h @@ -0,0 +1,169 @@ +/*
+ ChibiOS/GFX - Copyright (C) 2012, 2013
+ Joel Bodenmann aka Tectu <joel@unormal.org>
+
+ This file is part of ChibiOS/GFX.
+
+ ChibiOS/GFX 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.
+
+ ChibiOS/GFX 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 this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file drivers/tdisp/HD44780/tdisp_lld_board_st_stm32f4_discovery.h
+ * @brief TDISP driver subsystem board interface for the HD44780 display
+ *
+ * @addtogroup TDISP
+ * @{
+ */
+
+#ifndef _TDISP_LLD_BOARD_H
+#define _TDISP_LLD_BOARD_H
+
+/* Configure these to match the hardware connections on your board */
+#define BUS_4BITS TRUE
+
+/* Configure the bitoffset in the dataport so they match with the
+ * hardware pins. An offset of 0 means bit0 stays at bit0 of the dataport.
+ * If the offset is set to 3, bit0 of the nibble will be positioned at
+ * bit3 of the hardware-port.
+ */
+#define hardware_offset 0
+
+/* The port where the data is sent to. In the
+ * low-leveldriver het hardware_offset is taken
+ * into account. If for example the hardware_offset
+ * is set to 3, then de data will be sent to
+ * PE3, PE4, PE5 en PE6, if the dataport where GPIOE.
+ */
+#define PORT_DATA GPIOE
+
+/* The port used to controle the controle lines of
+ * the display.
+ */
+#define PORT_CTRL GPIOD
+/* Pin to controle the R/S-line of the display */
+#define PIN_RS 0
+/* Pin to controle the EN-line of the display */
+#define PIN_EN 1
+/* Pin to controle the R/W-pin of the display.
+ * If reading of the display is not used disable
+ * reading in the gfxconf.h and put a dummy value here
+ * as it will not be used.
+ */
+#define PIN_RW 7
+
+#if TDISP_USE_BACKLIGHT
+/* PWM configuration structure. We use timer 4 channel 2 (orange LED on board). */
+static const PWMConfig pwmcfg = {
+ 1000000, /* 1 MHz PWM clock frequency. */
+ 100, /* PWM period is 100 cycles. */
+ NULL,
+ {
+ {PWM_OUTPUT_ACTIVE_HIGH, NULL},
+ {PWM_OUTPUT_ACTIVE_HIGH, NULL},
+ {PWM_OUTPUT_ACTIVE_HIGH, NULL},
+ {PWM_OUTPUT_ACTIVE_HIGH, NULL}
+ },
+ 0
+};
+#endif
+
+/* Initializes the board.
+ * If you are using a specific setup, than copy the boardfile to your
+ * project directory and set in gfxconf.h that you are using a custom board file
+ * The next thing you have to do is to initialize the hardware port(s) you
+ * are using to communicate with the board.
+ */
+static void init_board(void) {
+ /* Initialize the ports for data and controle-lines */
+ palSetGroupMode(PORT_CTRL, PAL_WHOLE_PORT, 0, PAL_MODE_OUTPUT_PUSHPULL);
+ palSetGroupMode(PORT_DATA, PAL_WHOLE_PORT, 0, PAL_MODE_OUTPUT_PUSHPULL);
+ /* Set alle controle pins to low */
+ palClearPad(PORT_CTRL, PIN_RS);
+ palClearPad(PORT_CTRL, PIN_EN);
+ #if TDISP_NEED_READ
+ palClearPad(PORT_CTRL, PIN_RW);
+ #endif
+
+ #if TDISP_USE_BACKLIGHT
+ /* Display backlight control */
+ /* TIM4 is an alternate function 2 (AF2) */
+ pwmStart(&PWMD4, &pwmcfg);
+ palSetPadMode(GPIOD, 13, PAL_MODE_ALTERNATE(2));
+ pwmEnableChannel(&PWMD4, 1, 100);
+ #endif
+}
+
+/* This is the low-level routine for sending the bits
+ * to the LCD-display. This routine shifts
+ * the bits so they match the hardware port.
+ */
+static void writeToLCD(uint8_t data) {
+ palWritePort(PORT_DATA, data);
+ palSetPad(PORT_CTRL, PIN_EN);
+ chThdSleepMicroseconds(5);
+// chThdSleepMilliseconds(10);
+ palClearPad(PORT_CTRL, PIN_EN);
+ chThdSleepMicroseconds(5);
+// chThdSleepMilliseconds(10);
+ /* wait a little while so that de display can process the data */
+}
+
+/* Writes a command to the display. The
+ * RS-line is pulled low and than the
+ * data is send.
+ */
+static void write_cmd(uint8_t data) {
+ palClearPad(PORT_CTRL, PIN_RS);
+ #if BUS_4BITS
+ /* first send the high-nibble */
+ writeToLCD((data & 0xF0)>>4);
+ /* in 4-bit mode the high-nibble is zeroed out */
+ writeToLCD((data & 0x0F));
+ #else
+ writeToLCD(data);
+ #endif
+}
+
+// static void write_initcmd(uint8_t data) {
+// write_cmd(data);
+// }
+
+/* Write data to the display. The
+ * RS-line is pulled high and than the
+ * data is send.
+ */
+static void write_data(uint8_t data) {
+ palSetPad(PORT_CTRL, PIN_RS);
+ #if BUS_4BITS
+ /* first send the high-nibble */
+ writeToLCD((data & 0xF0)>>4);
+ /* in 4-bit mode the high-nibble is zeroed out */
+ writeToLCD((data & 0x0F));
+ #else
+ writeToLCD(data);
+ #endif
+}
+
+#if TDISP_USE_BACKLIGHT
+
+/* Sets the brightness of the backlight of the display, using
+ * the PWM channel */
+static void set_backlight(uint16_t percentage) {
+ pwmEnableChannel(&PWMD4, 1, percentage);
+}
+#endif
+
+#endif /* _TDISP_LLD_BOARD_H */
+/** @} */
+
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