74 lines
3.6 KiB
C
74 lines
3.6 KiB
C
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/******************************************************************************************************************************************
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* 文件名称: SWM341_iofilt.c
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* 功能说明: SWM341单片机的IO滤波器功能模块，对PAD到模块输入间的信号滤波，窄于指定宽度的脉冲视作毛刺，忽略
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* 技术支持: http://www.synwit.com.cn/e/tool/gbook/?bid=1
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* 注意事项:
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* 版本日期: V1.0.0 2016年1月30日
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* 升级记录:
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*
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*
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*******************************************************************************************************************************************
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* @attention
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*
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH CODING INFORMATION
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* REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A RESULT, SYNWIT SHALL NOT BE HELD LIABLE
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* FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT
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* OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION CONTAINED HEREIN IN CONN-
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* -ECTION WITH THEIR PRODUCTS.
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*
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* COPYRIGHT 2012 Synwit Technology
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*******************************************************************************************************************************************/
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#include "SWM341.h"
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#include "SWM341_iofilt.h"
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static uint32_t Width[2];
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/******************************************************************************************************************************************
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* 函数名称: IOFILT_Init()
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* 功能说明: IO滤波器初始化
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* 输 入: uint32_t IOFILTn 要初始化的滤波器，可取值 0-1
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* uint32_t signal 要对哪个信号进行滤波操作，可取值 IOFILT0_PB5、IOFILT0_PB4、...
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* uint32_t width 被选信号上宽度小于 width 个 HRC 时钟周期的脉冲被视作毛刺，过滤掉，可取值 IOFILT_WIDTH_2、IOFILT_WIDTH_4、...
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* 输 出: 无
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* 注意事项: 无
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******************************************************************************************************************************************/
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void IOFILT_Init(uint32_t IOFILTn, uint32_t signal, uint32_t width)
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{
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SYS->CLKSEL &= ~SYS_CLKSEL_IOFILT_Msk;
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SYS->CLKSEL |= (0 << SYS_CLKSEL_IOFILT_Pos); //滤波器时钟源：HRC
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SYS->CLKEN1 |= (1 << SYS_CLKEN1_IOFILT_Pos);
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*(&SYS->IOFILT0 + IOFILTn) = (signal << SYS_IOFILT_IOSEL_Pos) |
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(0 << SYS_IOFILT_CLKDIV_Pos) |
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(width << SYS_IOFILT_TIM_Pos);
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Width[IOFILTn] = width;
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}
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/******************************************************************************************************************************************
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* 函数名称: IOFILT_Open()
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* 功能说明: IO滤波器开启
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* 输 入: uint32_t IOFILTn 要初始化的滤波器，可取值 0-1
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* 输 出: 无
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* 注意事项: 无
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******************************************************************************************************************************************/
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void IOFILT_Open(uint32_t IOFILTn)
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{
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*(&SYS->IOFILT0 + IOFILTn) |= (Width[IOFILTn] << SYS_IOFILT_TIM_Pos);
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}
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/******************************************************************************************************************************************
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* 函数名称: IOFILT_Close()
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* 功能说明: IO滤波器关闭，即不滤波，PAD上的信号直接进入模块
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* 输 入: uint32_t IOFILTn 要初始化的滤波器，可取值 0-1
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* 输 出: 无
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* 注意事项: 无
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******************************************************************************************************************************************/
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void IOFILT_Close(uint32_t IOFILTn)
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{
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*(&SYS->IOFILT0 + IOFILTn) &= ~SYS_IOFILT_TIM_Msk;
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}
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