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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;
}
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