越接近滑条一半部分的强信号,将导致最上部分产生相同程度的伪信号,但最终是杂散信号. 感应算法搜 索相邻最强的一组信号,以确定解析的滑条位置.
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辐射滑条
Figure 4. 手指触摸辐射滑条
对于 CSD UM,提供两种滑条类型:线性滑条和辐射滑条. 辐射滑条类似于线性滑条. 线性滑条有起点和 终点,而辐射滑条没有. 当发生触摸时,质心计算算法将考虑到当前开关左右侧的传感器的开关数量. 辐 射滑条不具有双工功能. CSD UM 具有两个支持辐射滑条的 API 功能. 第一个功能 CSD_wGetRadiaPos() 返回质心位置,第二个 CSD_wGetRadialInc() 通过分辨部件返回手指的移动情况. 当手指顺时针方向移动时,它是正偏量. 参考点 (0) 位于第一个传感器的中心. 线性滑条和辐射滑条的分辨率都受到限制,数值为 3000. 双工 滑条中的每个 PSoC 传感器连接都映射到滑条传感器阵列中的两个物理位置. 物理位置的第一部分 (较低 数值部分)按顺序映射到基部分配的传感器上,端口引脚由设计人员使用 CSD 向导分配. 物理传感器位 置的另一部分 (较高数值部分)由向导中的算法自动映射,并在包括文件中列出. 一旦创建好次序,某一 部分中相邻的传感器动作则不会导致另一部分中相邻的传感器动作. 小心地确定此次序,将其映射到印刷 电路板上.
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有许多方法可以确定物理传感器位置另一部分的次序. 最简单的方法是对第一部分中的传感器编制索引, 先对所有偶数传感器编制索引,然后是所有奇数传感器. 其他方法包括按相关值编制索引. 此用户模块选 择的方法是按三编制索引.
Figure 5. 按 3 编制索引
应当使滑条中的传感器电容均衡. 根据传感器或 PCB 设计,某些传感器对可能需要更长的路由. 当选择 双工时,双工传感器索引表由 CSD 向导自动生成. 下表列出的是不同滑条部分计数的双工序列.
Table 1. 不同滑条部分计数的双工序列 段序列 0,1,2,3,4,0,3,1,4,2 0,1,2,3,4,5,0,3,1,4,2,5 0,1,2,3,4,5,6,0,3,6,1,4,2,5 0,1,2,3,4,5,6,7,0,3,6,1,4,7,2,5 0,1,2,3,4,5,6,7,8,0,3,6,1,4,7,2,5,8 0,1,2,3,4,5,6,7,8,9,0,3,6,9,1,4,7,2,5,8 0,1,2,3,4,5,6,7,8,9,10,0,3,6,9,1,4,7,10,2,5,8 0,1,2,3,4,5,6,7,8,9,10,11,0,3,6,9,1,4,7,10,2,5,8,11 0,1,2,3,4,5,6,7,8,9,10,11,12,0,3,6,9,12,1,4,7,10,2,5,8,11 0,1,2,3,4,5,6,7,8,9,10,11,12,13,0,3,6,9,12,1,4,7,10,13,2,5,8,11 滑条段总计数 10 12 14 16 18 20 22 24 26 28
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滑条段总计数 30 32 34 36 38 40 42 44 46 48 50 52 54 56
段序列 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,0,3,6,9,12,1,4,7,10,13,2,5,8,11,14 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0,3,6,9,12,15,1,4,7,10,13,2,5,8,11,14 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,0,3,6,9,12,15,1,4,7,10,13,16,2,5,8,11,14 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,0,3,6,9,12,15,1,4,7,10,13,16,2,5,8,11,14,17 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,0,3,6,9,12,15,18,1,4,7,10,13,16,2,5,8,11 ,14,17 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,0,3,6,9,12,15,18,1,4,7,10,13,16,19,2, 5,8,11,14,17 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,0,3,6,9,12,15,18,1,4,7,10,13,16,19 ,2,5,8,11,14,17,20 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,0,3,6,9,12,15,18,21,1,4,7,10,13 ,16,19,2,5,8,11,14,17,20 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,0,3,6,9,12,15,18,21,1,4,7,10 ,13,16,19,22,2,5,8,11,14,17,20 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,0,3,6,9,12,15,18,21,1,4,7 ,10,13,16,19,22,2,5,8,11,14,17,20,23 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,0,3,6,9,12,15,18,21,24 ,1,4,7,10,13,16,19,22,2,5,8,11,14,17,20,23 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,0,3,6,9,12,15,18,21 ,24,1,4,7,10,13,16,19,22,25,2,5,8,11,14,17,20,23 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,0,3,6,9,12,15,18 ,21,24,1,4,7,10,13,16,19,22,25,2,5,8,11,14,17,20,23,26 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,0,3,6,9,12,15 ,18,21,24,27,1,4,7,10,13,16,19,22,25,2,5,8,11,14,17,20,23,26

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