STM32F2: Add SYSCFG support.

Turn it on at init() time on F2.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

2 files changed, 79 insertions, 0 deletions

diff --git a/libmaple/stm32f2/rules.mk b/libmaple/stm32f2/rules.mk
index c98f5b9..a5be551 100644
--- a/libmaple/stm32f2/rules.mk
+++ b/libmaple/stm32f2/rules.mk
@@ -15,6 +15,7 @@ cSRCS_$(d) := adc.c
 cSRCS_$(d) += fsmc.c
 cSRCS_$(d) += gpio.c
 cSRCS_$(d) += rcc.c
+cSRCS_$(d) += syscfg.c
 cSRCS_$(d) += timer.c
 cSRCS_$(d) += usart.c
 
diff --git a/libmaple/stm32f2/syscfg.c b/libmaple/stm32f2/syscfg.c
new file mode 100644
index 0000000..19e932e
--- /dev/null
+++ b/libmaple/stm32f2/syscfg.c
@@ -0,0 +1,78 @@
+/******************************************************************************
+ * 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;
+}