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authorKarl Palsson2013-01-22 23:37:54 +0000
committerKarl Palsson2013-01-22 23:55:59 +0000
commite5b32503825c53d278d09a34d7165020e1b5cad4 (patch)
tree860410abc4d99e2d16dee8e69a5d5b42b881f20d /lib
parentb6ee57a5b9fbac7fb1cfe62b6ed8a341bee5543e (diff)
[stm32] Support the "new" BCD style RTC peripheral
Add the register definitions and some of the most basic helper functions for the new style BCD RTC module found on the F2, F4, L1, F3 and F0. This tries to keep as close to HACKING_COMMON_DOC as possible, while maintaining sane names.
Diffstat (limited to 'lib')
-rw-r--r--lib/stm32/common/rtc_common_bcd.c78
-rw-r--r--lib/stm32/f2/Makefile3
-rw-r--r--lib/stm32/f2/rtc.c27
-rw-r--r--lib/stm32/f4/Makefile3
-rw-r--r--lib/stm32/f4/rtc.c27
-rw-r--r--lib/stm32/l1/Makefile1
-rw-r--r--lib/stm32/l1/rtc.c27
7 files changed, 164 insertions, 2 deletions
diff --git a/lib/stm32/common/rtc_common_bcd.c b/lib/stm32/common/rtc_common_bcd.c
new file mode 100644
index 0000000..c302ea2
--- /dev/null
+++ b/lib/stm32/common/rtc_common_bcd.c
@@ -0,0 +1,78 @@
+/** @addtogroup rtc_file */
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * 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/rtc.h>
+
+/*---------------------------------------------------------------------------*/
+/** @brief Set RTC prescalars.
+
+This sets the RTC synchronous and asynchronous prescalars.
+*/
+
+void rtc_set_prescaler(u32 sync, u32 async) {
+ /*
+ * Even if only one of the two fields needs to be changed,
+ * 2 separate write accesses must be performed to the RTC_PRER register.
+ */
+ RTC_PRER = (sync & RTC_PRER_PREDIV_S_MASK);
+ RTC_PRER |= (async << RTC_PRER_PREDIV_A_SHIFT);
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Wait for RTC registers to be synchronised with the APB1 bus
+
+ Time and Date are accessed through shadow registers which must be synchronized
+*/
+
+void rtc_wait_for_synchro(void) {
+ /* Unlock RTC registers */
+ RTC_WPR = 0xca;
+ RTC_WPR = 0x53;
+
+ RTC_ISR &= ~(RTC_ISR_RSF);
+
+ while (!(RTC_ISR & RTC_ISR_RSF)) {
+ ;
+ }
+ /* disable write protection again */
+ RTC_WPR = 0xff;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Unlock write access to the RTC registers
+
+*/
+void rtc_unlock(void) {
+ RTC_WPR = 0xca;
+ RTC_WPR = 0x53;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Lock write access to the RTC registers
+
+*/
+void rtc_lock(void) {
+ RTC_WPR = 0xff;
+}
+
+/**@}*/
diff --git a/lib/stm32/f2/Makefile b/lib/stm32/f2/Makefile
index 3d3c756..85e6458 100644
--- a/lib/stm32/f2/Makefile
+++ b/lib/stm32/f2/Makefile
@@ -31,7 +31,8 @@ ARFLAGS = rcs
OBJS = rcc.o gpio.o flash.o exti2.o timer.o \
gpio_common_all.o gpio_common_f24.o dma_common_f24.o spi_common_all.o \
dac_common_all.o usart_common_all.o iwdg_common_all.o i2c_common_all.o \
- crc_common_all.o
+ crc_common_all.o \
+ rtc_common_bcd.o
VPATH += ../../usb:../:../../cm3:../common
diff --git a/lib/stm32/f2/rtc.c b/lib/stm32/f2/rtc.c
new file mode 100644
index 0000000..461d0b1
--- /dev/null
+++ b/lib/stm32/f2/rtc.c
@@ -0,0 +1,27 @@
+/** @defgroup rtc_file RTC
+
+@ingroup STM32F2xx
+
+@brief <b>libopencm3 STM32F2xx RTC</b>
+
+*/
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * 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/rtc.h>
+#include <libopencm3/stm32/common/rtc_common_bcd.h>
diff --git a/lib/stm32/f4/Makefile b/lib/stm32/f4/Makefile
index ee7f953..8ff7c6a 100644
--- a/lib/stm32/f4/Makefile
+++ b/lib/stm32/f4/Makefile
@@ -35,7 +35,8 @@ OBJS = rcc.o gpio.o flash.o exti2.o pwr.o timer.o \
pwr_common_all.o \
gpio_common_all.o gpio_common_f24.o dma_common_f24.o spi_common_all.o \
dac_common_all.o usart_common_all.o iwdg_common_all.o i2c_common_all.o \
- crc_common_all.o
+ crc_common_all.o \
+ rtc_common_bcd.o
VPATH += ../../usb:../:../../cm3:../common
diff --git a/lib/stm32/f4/rtc.c b/lib/stm32/f4/rtc.c
new file mode 100644
index 0000000..1b301fa
--- /dev/null
+++ b/lib/stm32/f4/rtc.c
@@ -0,0 +1,27 @@
+/** @defgroup rtc_file RTC
+
+@ingroup STM32F4xx
+
+@brief <b>libopencm3 STM32F4xx RTC</b>
+
+*/
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * 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/rtc.h>
+#include <libopencm3/stm32/common/rtc_common_bcd.h>
diff --git a/lib/stm32/l1/Makefile b/lib/stm32/l1/Makefile
index c4e767f..9b677ab 100644
--- a/lib/stm32/l1/Makefile
+++ b/lib/stm32/l1/Makefile
@@ -32,6 +32,7 @@ OBJS = rcc.o desig.o crc.o usart.o exti2.o flash.o timer.o
OBJS += gpio_common_all.o gpio_common_f24.o spi_common_all.o crc_common_all.o
OBJS += dac_common_all.o usart_common_all.o iwdg_common_all.o i2c_common_all.o
OBJS += pwr_common_all.o pwr.o
+OBJS += rtc_common_bcd.o
VPATH += ../../usb:../:../../cm3:../common
diff --git a/lib/stm32/l1/rtc.c b/lib/stm32/l1/rtc.c
new file mode 100644
index 0000000..bc7f87f
--- /dev/null
+++ b/lib/stm32/l1/rtc.c
@@ -0,0 +1,27 @@
+/** @defgroup rtc_file RTC
+
+@ingroup STM32L1xx
+
+@brief <b>libopencm3 STM32L1xx RTC</b>
+
+*/
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * 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/rtc.h>
+#include <libopencm3/stm32/common/rtc_common_bcd.h>