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198 lines
6.1 KiB
198 lines
6.1 KiB
/**
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******************************************************************************
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* @file stm8s_awu.c
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* @author MCD Application Team
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* @version V2.2.0
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* @date 30-September-2014
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* @brief This file contains all the functions for the AWU peripheral.
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2>
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*
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* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
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* You may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.st.com/software_license_agreement_liberty_v2
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm8s_awu.h"
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/** @addtogroup STM8S_StdPeriph_Driver
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/* See also AWU_Timebase_TypeDef structure in stm8s_awu.h file :
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N 2 5 1 2 4 8 1 3 6 1 2 5 1 2 1 3
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O 5 0 m m m m 6 2 4 2 5 1 s s 2 0
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I 0 0 s s s s m m m 8 6 2 s s
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T u u s s s m m m
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s s s s s
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*/
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/** Contains the different values to write in the APR register (used by AWU_Init function) */
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CONST uint8_t APR_Array[17] =
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{
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0, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 61, 23, 23, 62
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};
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/** Contains the different values to write in the TBR register (used by AWU_Init function) */
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CONST uint8_t TBR_Array[17] =
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{
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 12, 14, 15, 15
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};
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/* Public functions ----------------------------------------------------------*/
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/**
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* @addtogroup AWU_Public_Functions
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* @{
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*/
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/**
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* @brief Deinitializes the AWU peripheral registers to their default reset
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* values.
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* @param None
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* @retval None
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*/
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void AWU_DeInit(void)
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{
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AWU->CSR = AWU_CSR_RESET_VALUE;
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AWU->APR = AWU_APR_RESET_VALUE;
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AWU->TBR = AWU_TBR_RESET_VALUE;
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}
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/**
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* @brief Initializes the AWU peripheral according to the specified parameters.
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* @param AWU_TimeBase : Time base selection (interval between AWU interrupts).
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* can be one of the values of @ref AWU_Timebase_TypeDef.
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* @retval None
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* @par Required preconditions:
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* The LS RC calibration must be performed before calling this function.
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*/
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void AWU_Init(AWU_Timebase_TypeDef AWU_TimeBase)
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{
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/* Check parameter */
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assert_param(IS_AWU_TIMEBASE_OK(AWU_TimeBase));
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/* Enable the AWU peripheral */
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AWU->CSR |= AWU_CSR_AWUEN;
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/* Set the TimeBase */
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AWU->TBR &= (uint8_t)(~AWU_TBR_AWUTB);
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AWU->TBR |= TBR_Array[(uint8_t)AWU_TimeBase];
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/* Set the APR divider */
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AWU->APR &= (uint8_t)(~AWU_APR_APR);
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AWU->APR |= APR_Array[(uint8_t)AWU_TimeBase];
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}
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/**
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* @brief Enable or disable the AWU peripheral.
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* @param NewState Indicates the new state of the AWU peripheral.
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* @retval None
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* @par Required preconditions:
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* Initialisation of AWU and LS RC calibration must be done before.
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*/
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void AWU_Cmd(FunctionalState NewState)
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{
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if (NewState != DISABLE)
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{
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/* Enable the AWU peripheral */
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AWU->CSR |= AWU_CSR_AWUEN;
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}
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else
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{
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/* Disable the AWU peripheral */
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AWU->CSR &= (uint8_t)(~AWU_CSR_AWUEN);
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}
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}
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/**
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* @brief Update APR register with the measured LSI frequency.
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* @par Note on the APR calculation:
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* A is the integer part of lsifreqkhz/4 and x the decimal part.
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* x <= A/(1+2A) is equivalent to A >= x(1+2A) and also to 4A >= 4x(1+2A) [F1]
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* but we know that A + x = lsifreqkhz/4 ==> 4x = lsifreqkhz-4A
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* so [F1] can be written :
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* 4A >= (lsifreqkhz-4A)(1+2A)
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* @param LSIFreqHz Low Speed RC frequency measured by timer (in Hz).
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* @retval None
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* @par Required preconditions:
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* - AWU must be disabled to avoid unwanted interrupts.
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*/
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void AWU_LSICalibrationConfig(uint32_t LSIFreqHz)
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{
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uint16_t lsifreqkhz = 0x0;
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uint16_t A = 0x0;
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/* Check parameter */
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assert_param(IS_LSI_FREQUENCY_OK(LSIFreqHz));
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lsifreqkhz = (uint16_t)(LSIFreqHz / 1000); /* Converts value in kHz */
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/* Calculation of AWU calibration value */
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A = (uint16_t)(lsifreqkhz >> 2U); /* Division by 4, keep integer part only */
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if ((4U * A) >= ((lsifreqkhz - (4U * A)) * (1U + (2U * A))))
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{
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AWU->APR = (uint8_t)(A - 2U);
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}
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else
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{
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AWU->APR = (uint8_t)(A - 1U);
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}
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}
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/**
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* @brief Configures AWU in Idle mode to reduce power consumption.
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* @param None
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* @retval None
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*/
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void AWU_IdleModeEnable(void)
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{
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/* Disable AWU peripheral */
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AWU->CSR &= (uint8_t)(~AWU_CSR_AWUEN);
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/* No AWU timebase */
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AWU->TBR = (uint8_t)(~AWU_TBR_AWUTB);
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}
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/**
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* @brief Returns status of the AWU peripheral flag.
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* @param None
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* @retval FlagStatus : Status of the AWU flag.
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* This parameter can be any of the @ref FlagStatus enumeration.
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*/
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FlagStatus AWU_GetFlagStatus(void)
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{
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return((FlagStatus)(((uint8_t)(AWU->CSR & AWU_CSR_AWUF) == (uint8_t)0x00) ? RESET : SET));
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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