From 1dc7d758f96dd2b9bd7b03f01ca032d68b696cf0 Mon Sep 17 00:00:00 2001
From: root <root@lab2.panaceas.james.local>
Date: Sun, 2 Nov 2014 10:14:39 +0000
Subject: fish
---
libopencm3/lib/stm32/l1/lcd.c | 154 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 154 insertions(+)
create mode 100644 libopencm3/lib/stm32/l1/lcd.c
(limited to 'libopencm3/lib/stm32/l1/lcd.c')
diff --git a/libopencm3/lib/stm32/l1/lcd.c b/libopencm3/lib/stm32/l1/lcd.c
new file mode 100644
index 0000000..68173ab
--- /dev/null
+++ b/libopencm3/lib/stm32/l1/lcd.c
@@ -0,0 +1,154 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2014 Nikolay Merinov <nikolay.merinov@member.fsf.org>
+ *
+ * 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/l1/lcd.h>
+#include <libopencm3/stm32/rcc.h>
+
+void lcd_enable(void)
+{
+ LCD_CR |= LCD_CR_LCDEN;
+}
+
+void lcd_update(void)
+{
+ LCD_SR |= LCD_SR_UDR;
+}
+
+void lcd_wait_for_lcd_enabled(void)
+{
+ while ((LCD_SR & LCD_SR_ENS) == 0);
+}
+
+void lcd_wait_for_step_up_ready(void)
+{
+ while ((LCD_SR & LCD_SR_RDY) == 0);
+}
+
+void lcd_wait_for_update_ready(void)
+{
+ while ((LCD_SR & LCD_SR_UDR) != 0);
+}
+
+int lcd_is_enabled(void)
+{
+ return ((LCD_SR & LCD_SR_ENS) != 0);
+}
+
+int lcd_is_step_up_ready(void)
+{
+ return ((LCD_SR & LCD_SR_RDY) != 0);
+}
+
+int lcd_is_for_update_ready(void)
+{
+ return ((LCD_SR & LCD_SR_UDR) == 0);
+}
+
+void lcd_set_contrast(uint8_t contrast)
+{
+ LCD_FCR &= ~(LCD_FCR_CC_MASK << LCD_FCR_CC_SHIFT);
+ LCD_FCR |= contrast << LCD_FCR_CC_SHIFT;
+}
+
+void lcd_set_bias(uint8_t bias)
+{
+ LCD_CR &= ~(LCD_CR_BIAS_MASK << LCD_CR_BIAS_SHIFT);
+ LCD_CR |= bias << LCD_CR_BIAS_SHIFT;
+}
+
+void lcd_set_duty(uint8_t duty)
+{
+ LCD_CR &= ~(LCD_CR_DUTY_MASK << LCD_CR_DUTY_SHIFT);
+ LCD_CR |= duty << LCD_CR_DUTY_SHIFT;
+}
+
+void lcd_set_prescaler(uint8_t ps)
+{
+ LCD_FCR &= ~(LCD_FCR_PS_MASK << LCD_FCR_PS_SHIFT);
+ LCD_FCR |= ps << LCD_FCR_PS_SHIFT;
+}
+
+void lcd_set_divider(uint8_t div)
+{
+ LCD_FCR &= ~(LCD_FCR_DIV_MASK << LCD_FCR_DIV_SHIFT);
+ LCD_FCR |= div << LCD_FCR_DIV_SHIFT;
+}
+
+void lcd_enable_segment_multiplexing(void)
+{
+ LCD_CR |= LCD_CR_MUX_SEG;
+}
+
+void lcd_disable_segment_multiplexing(void)
+{
+ LCD_CR &= ~LCD_CR_MUX_SEG;
+}
+
+void lcd_set_refresh_frequency(uint32_t frequency)
+{
+ uint32_t duty, lcd_clock;
+ switch ((LCD_CR >> LCD_CR_DUTY_SHIFT) & LCD_CR_DUTY_MASK) {
+ case LCD_CR_DUTY_STATIC:
+ duty = 1;
+ break;
+ case LCD_CR_DUTY_1_2:
+ duty = 2;
+ break;
+ case LCD_CR_DUTY_1_3:
+ duty = 3;
+ break;
+ case LCD_CR_DUTY_1_4:
+ duty = 4;
+ break;
+ case LCD_CR_DUTY_1_8:
+ duty = 8;
+ break;
+ default:
+ /* Incorrect duty */
+ return;
+ }
+
+ switch ((RCC_CSR >> RCC_CSR_RTCSEL_SHIFT) & RCC_CSR_RTCSEL_MASK) {
+ case RCC_CSR_RTCSEL_LSE:
+ lcd_clock = 32786;
+ break;
+ case RCC_CSR_RTCSEL_LSI:
+ lcd_clock = 37000;
+ break;
+ case RCC_CSR_RTCSEL_HSI:
+ lcd_clock = 16000000;
+ break;
+ default:
+ /* RCC Clock not selected */
+ return;
+ }
+
+ /* PS * DIV = lcd_clock/(duty * freq) */
+ uint32_t ps_mul_div = lcd_clock / (duty * frequency);
+
+ int div, ps = 0;
+ while (ps_mul_div > 32) {
+ ps_mul_div >>= 1;
+ ps++;
+ }
+ div = ps_mul_div - 16;
+
+ lcd_set_prescaler(ps);
+ lcd_set_divider(div);
+}
--
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