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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32f20x_misc.c
* Author : WCH
* Version : V1.0.0
* Date : 2021/08/08
* Description : This file provides all the miscellaneous firmware functions .
*********************************************************************************/
#include "ch32f20x_misc.h"
#define AIRCR_VECTKEY_MASK ((uint32_t)0x05FA0000)
/******************************************************************************************
* Function Name : NVIC_PriorityGroupConfig
* Description : Configures the priority grouping: pre-emption priority and subpriority.
* Input : NVIC_PriorityGroup: specifies the priority grouping bits length.
* NVIC_PriorityGroup_0: 0 bits for pre-emption priority
* 4 bits for subpriority
* NVIC_PriorityGroup_1: 1 bits for pre-emption priority
* 3 bits for subpriority
* NVIC_PriorityGroup_2: 2 bits for pre-emption priority
* 2 bits for subpriority
* NVIC_PriorityGroup_3: 3 bits for pre-emption priority
* 1 bits for subpriority
* NVIC_PriorityGroup_4: 4 bits for pre-emption priority
* 0 bits for subpriority
* Return : None
*******************************************************************************************/
void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
{
SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
}
/******************************************************************************************
* Function Name : NVIC_Init
* Description : Initializes the NVIC peripheral according to the specified parameters in
* the NVIC_InitStruct.
* Input : NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains the
* configuration information for the specified NVIC peripheral.
* Return : None
*******************************************************************************************/
void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
{
uint32_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;
if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
{
/* Compute the Corresponding IRQ Priority */
tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;
tmppre = (0x4 - tmppriority);
tmpsub = tmpsub >> tmppriority;
tmppriority = (uint32_t)NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
tmppriority |= NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub;
tmppriority = tmppriority << 0x04;
NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;
/* Enable the Selected IRQ Channels */
NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
(uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
}
else
{
/* Disable the Selected IRQ Channels */
NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
(uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
}
}
/******************************************************************************************
* Function Name : NVIC_SetVectorTable
* Description : Sets the vector table location and Offset.
* Input : NVIC_VectTab: specifies if the vector table is in RAM or FLASH memory.The
* value can be NVIC_VectTab_RAM or NVIC_VectTab_FLASH.
* Offset : Vector Table base offset field. This value must be a multiple
* of 0x200.
* Return : None
*******************************************************************************************/
void NVIC_SetVectorTable(uint32_t NVIC_VectTab, uint32_t Offset)
{
SCB->VTOR = NVIC_VectTab | (Offset & (uint32_t)0x1FFFFF80);
}
/******************************************************************************************
* Function Name : NVIC_SystemLPConfig
* Description : Selects the condition for the system to enter low power mode.
* Input : LowPowerMode: Specifies the new mode for the system to enter low power mode.
* NVIC_LP_SEVONPEND
* NVIC_LP_SLEEPDEEP
* NVIC_LP_SLEEPONEXIT
* NewState : new state of LP condition. This parameter can be: ENABLE or DISABLE.
* Return : None
*******************************************************************************************/
void NVIC_SystemLPConfig(uint8_t LowPowerMode, FunctionalState NewState)
{
if (NewState != DISABLE)
{
SCB->SCR |= LowPowerMode;
}
else
{
SCB->SCR &= (uint32_t)(~(uint32_t)LowPowerMode);
}
}
/******************************************************************************************
* Function Name : SysTick_CLKSourceConfig
* Description : Configures the SysTick clock source.
* Input : SysTick_CLKSource: Specifies the new mode for the system to enter low power mode.
* ysTick_CLKSource_HCLK_Div8: AHB clock divided by 8 selected as SysTick clock source.
* SysTick_CLKSource_HCLK: AHB clock selected as SysTick clock source.
* Return : None
*******************************************************************************************/
void SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource)
{
if (SysTick_CLKSource == SysTick_CLKSource_HCLK)
{
SysTick->CTRL |= SysTick_CLKSource_HCLK;
}
else
{
SysTick->CTRL &= SysTick_CLKSource_HCLK_Div8;
}
}
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