stm32/l1: lcd: example using the LCD
This commit is contained in:
Nikolay Merinov
committed by
Karl Palsson
Karl Palsson
parent
2ba1619889
commit
2372d8b59f
25
examples/stm32/l1/stm32l-discovery/lcd-display/Makefile
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25
examples/stm32/l1/stm32l-discovery/lcd-display/Makefile
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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2014 Nikolay Merinov <nikolay.merinov@member.fsf.org>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = lcd-hello
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LDSCRIPT = $(OPENCM3_DIR)/lib/stm32/l1/stm32l15xxb.ld
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include ../../Makefile.include
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7
examples/stm32/l1/stm32l-discovery/lcd-display/README
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7
examples/stm32/l1/stm32l-discovery/lcd-display/README
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This example program display word *HELLO on default LCD screen of
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STM32L-DISCOVERY board.
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201
examples/stm32/l1/stm32l-discovery/lcd-display/lcd-hello.c
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examples/stm32/l1/stm32l-discovery/lcd-display/lcd-hello.c
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2014 Nikolay Merinov <nikolay.merinov@member.fsf.org>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/l1/lcd.h>
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static void lcd_init(void)
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{
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/* Move all needed GPIO pins to LCD alternative mode */
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rcc_peripheral_enable_clock (&RCC_AHBENR, RCC_AHBENR_GPIOAEN
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| RCC_AHBENR_GPIOBEN | RCC_AHBENR_GPIOCEN);
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rcc_peripheral_enable_clock (&RCC_AHBLPENR, RCC_AHBLPENR_GPIOALPEN
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| RCC_AHBLPENR_GPIOBLPEN | RCC_AHBLPENR_GPIOCLPEN);
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO1 | GPIO2
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| GPIO3 | GPIO8 | GPIO9 | GPIO10 | GPIO15);
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gpio_mode_setup(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE,
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GPIO3 | GPIO4 | GPIO5 | GPIO8 | GPIO9 | GPIO10 | GPIO11
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| GPIO12 | GPIO13 | GPIO14 | GPIO15);
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gpio_mode_setup(GPIOC, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO0 | GPIO1
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| GPIO2 | GPIO3 | GPIO6 | GPIO7 | GPIO8 | GPIO9
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| GPIO10 | GPIO11);
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gpio_set_af (GPIOA, GPIO_AF11, GPIO1 | GPIO2 | GPIO3 | GPIO8 | GPIO9
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| GPIO10 | GPIO15);
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gpio_set_af (GPIOB, GPIO_AF11, GPIO3 | GPIO4 | GPIO5 | GPIO8 | GPIO9
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| GPIO10 | GPIO11 | GPIO12 | GPIO13 | GPIO14 | GPIO15);
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gpio_set_af (GPIOC, GPIO_AF11, GPIO0 | GPIO1 | GPIO2 | GPIO3 | GPIO6
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| GPIO7 | GPIO8 | GPIO9 | GPIO10 | GPIO11);
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/* Enable LCD and use LSE clock as RTC/LCD clock. */
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rcc_peripheral_enable_clock (&RCC_APB1ENR, RCC_APB1ENR_PWREN | RCC_APB1ENR_LCDEN);
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pwr_disable_backup_domain_write_protect ();
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rcc_osc_on (LSE);
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rcc_wait_for_osc_ready (LSE);
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rcc_rtc_select_clock (RCC_CSR_RTCSEL_LSE);
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RCC_CSR |= RCC_CSR_RTCEN; /* Enable RTC clock */
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pwr_enable_backup_domain_write_protect ();
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/* Map SEG[43:40] to SEG[31:28], use 4 LCD commons, use 3 voltage levels
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when driving LCD display */
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lcd_enable_segment_multiplexing ();
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lcd_set_duty (LCD_CR_DUTY_1_4);
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lcd_set_bias (LCD_CR_BIAS_1_3);
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/* Set screen redraw frequency to 100Hz */
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lcd_set_refresh_frequency (100);
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/* And increase contrast */
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lcd_set_contrast (LCD_FCR_CC_5);
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lcd_enable ();
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do {} while (!lcd_is_enabled ());
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do {} while (!lcd_is_step_up_ready ());
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}
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static void clear_lcd_ram(void)
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{
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LCD_RAM_COM0 = 0;
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LCD_RAM_COM1 = 0;
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LCD_RAM_COM2 = 0;
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LCD_RAM_COM3 = 0;
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}
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/* LCD MAPPING:
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A
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_ ----------
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COL |_| |\ |J /|
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F| H | K |B
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_ | \ | / |
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COL |_| --G-- --M--
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| /| \ |
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E| Q | N |C
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_ | / |P \|
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DP |_| -----------
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D
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`mask' corresponds to bits in lexicographic order: mask & 1 == A, mask & 2 == B,
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and so on.
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*/
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static void write_mask_to_lcd_ram (int position, uint16_t mask, int clear_before)
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{
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/* Every pixel of character at position can be accessed
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as LCD_RAM_COMx & (1 << Px) */
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int P1,P2,P3,P4;
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if (position < 2) P1 = 2*position;
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else P1 = 2*position+4;
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if (position == 1) P2 = P1+5;
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else P2 = P1+1;
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if (position < 3) P3 = (23-2*position)+6;
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else P3 = (23-2*position)+4;
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if (position == 5) {
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P4 = P3;
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P3 -= 1;
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} else {
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P4 = P3 - 1;
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}
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uint32_t COM0,COM1,COM2,COM3;
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COM0 = LCD_RAM_COM0;
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COM1 = LCD_RAM_COM1;
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COM2 = LCD_RAM_COM2;
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COM3 = LCD_RAM_COM3;
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if (clear_before) {
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COM0&= ~(1<<P1 | 1<<P2 | 1<<P3 | 1<<P4);
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COM1&= ~(1<<P1 | 1<<P2 | 1<<P3 | 1<<P4);
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COM2&= ~(1<<P1 | 1<<P2 | 1<<P3 | 1<<P4);
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COM3&= ~(1<<P1 | 1<<P2 | 1<<P3 | 1<<P4);
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}
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COM0 |= ((mask >> 0x1) & 1) << P4 | ((mask >> 0x4) & 1) << P1
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| ((mask >> 0x6) & 1) << P3 | ((mask >> 0xA) & 1) << P2;
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COM1 |= ((mask >> 0x0) & 1) << P4 | ((mask >> 0x2) & 1) << P2
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| ((mask >> 0x3) & 1) << P1 | ((mask >> 0x5) & 1) << P3;
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COM3 |= ((mask >> 0x7) & 1) << P3 | ((mask >> 0x8) & 1) << P4
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| ((mask >> 0xB) & 1) << P1 | ((mask >> 0xE) & 1) << P2;
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COM2 |= ((mask >> 0x9) & 1) << P4 | ((mask >> 0xC) & 1) << P1
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| ((mask >> 0xD) & 1) << P3 | ((mask >> 0xF) & 1) << P2;
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LCD_RAM_COM0 = COM0;
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LCD_RAM_COM1 = COM1;
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LCD_RAM_COM2 = COM2;
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LCD_RAM_COM3 = COM3;
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}
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static void write_char_to_lcd_ram (int position, uint8_t symbol, bool clear_before)
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{
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uint16_t from_ascii[0x60] = {
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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/* ! " # $ % & ' */
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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/* ( ) * + , - . / */
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0x0000, 0x0000, 0x3FC0, 0x1540, 0x0000, 0x0440, 0x4000, 0x2200,
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/* 0 1 2 3 4 5 6 7 */
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0x003F, 0x0006, 0x045B, 0x044F, 0x0466, 0x046D, 0x047D, 0x2201,
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/* 8 9 : ; < = > ? */
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0x047F, 0x046F, 0x8000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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/* @ A B C D E F G */
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0x0000, 0x0477, 0x047C, 0x0039, 0x045E, 0x0479, 0x0471, 0x043D,
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/* H I J K L M N O */
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0x0476, 0x1109, 0x001E, 0x1B00, 0x0038, 0x02B6, 0x08B6, 0x003F,
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/* P Q R S T U V W */
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0x0473, 0x0467, 0x0C73, 0x046D, 0x1101, 0x003E, 0x0886, 0x2836,
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/* X Y Z [ \ ] ^ _ */
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0x2A80, 0x1280, 0x2209, 0x0000, 0x0880, 0x0000, 0x0000, 0x0008
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};
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if (symbol > 0x60) return; // masks not defined. Nothing to display
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write_mask_to_lcd_ram (position, from_ascii[symbol], clear_before);
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}
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static void lcd_display_hello (void)
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{
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do {} while (!lcd_is_for_update_ready ());
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clear_lcd_ram (); /* all segments off */
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write_char_to_lcd_ram (0, '*', true);
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write_char_to_lcd_ram (1, 'H', true);
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write_char_to_lcd_ram (2, 'E', true);
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write_char_to_lcd_ram (3, 'L', true);
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write_char_to_lcd_ram (4, 'L', true);
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write_char_to_lcd_ram (5, 'O', true);
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lcd_update ();
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}
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int main(void)
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{
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int i;
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lcd_init ();
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lcd_display_hello ();
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for (i = 0; i < 1000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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return 0;
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}
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