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authorMarti Bolivar <mbolivar@leaflabs.com>2012-06-03 21:00:14 -0400
committerMarti Bolivar <mbolivar@leaflabs.com>2012-06-03 22:44:43 -0400
commitb52f574dd6ec75157aebc48f1504832c0dd1c281 (patch)
tree0880c917ae222ded920b8c392b54b86fb3b0d7d3 /libmaple/stm32f2/syscfg.c
parenteaf34012efe105c5c7e9654c5cc0e988e4bbd719 (diff)
downloadlibrambutan-b52f574dd6ec75157aebc48f1504832c0dd1c281.tar.gz
librambutan-b52f574dd6ec75157aebc48f1504832c0dd1c281.zip
STM32F2: Add SYSCFG support.
Turn it on at init() time on F2. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
Diffstat (limited to 'libmaple/stm32f2/syscfg.c')
-rw-r--r--libmaple/stm32f2/syscfg.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/libmaple/stm32f2/syscfg.c b/libmaple/stm32f2/syscfg.c
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file libmaple/stm32f2/syscfg.c
+ * @brief SYSCFG routines.
+ */
+
+#include <libmaple/syscfg.h>
+#include <libmaple/bitband.h>
+#include <libmaple/rcc.h>
+
+/**
+ * @brief Initialize the SYSCFG peripheral.
+ */
+void syscfg_init(void) {
+ rcc_clk_enable(RCC_SYSCFG);
+ rcc_reset_dev(RCC_SYSCFG);
+}
+
+/**
+ * @brief Turn on the I/O compensation cell.
+ *
+ * It's only safe to do this when the supply voltage is between 2.4 V
+ * and 3.6 V.
+ */
+void syscfg_enable_io_compensation(void) {
+ bb_peri_set_bit(&SYSCFG_BASE->CMPCR, SYSCFG_CMPCR_CMP_PD_BIT, 1);
+ while (!(SYSCFG_BASE->CMPCR & SYSCFG_CMPCR_READY))
+ ;
+}
+
+/**
+ * @brief Turn off the I/O compensation cell.
+ */
+void syscfg_disable_io_compensation(void) {
+ bb_peri_set_bit(&SYSCFG_BASE->CMPCR, SYSCFG_CMPCR_CMP_PD_BIT, 0);
+}
+
+/**
+ * @brief Set the memory to be mapped at address 0x00000000.
+ *
+ * This function can be used to override the BOOT pin
+ * configuration. Some restrictions apply; see your chip's reference
+ * manual for the details.
+ *
+ * @param mode Mode to set
+ * @see syscfg_mem_mode
+ */
+void syscfg_set_mem_mode(syscfg_mem_mode mode) {
+ uint32 memrmp = SYSCFG_BASE->MEMRMP;
+ memrmp &= ~SYSCFG_MEMRMP_MEM_MODE;
+ memrmp |= (uint32)mode;
+ SYSCFG_BASE->MEMRMP = memrmp;
+}