72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
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#include "arr_tool.h"
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//void arr_move_front(uint16_t arr[],uint32_t length)
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//{
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//
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// uint16_t temp = arr[0],i;
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// for (i = 0; i < length; i++)
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// {
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// arr[i] = arr[i + 1];
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// }
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// arr[length-1]=temp;
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//}
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uint16_t find_max_val_position(uint16_t* max_val,uint16_t* arr,uint16_t len)
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{
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uint16_t i;
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uint16_t max_p=0;
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*max_val = 0;
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for (i = 0 ; i<len ; i++)
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{
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if(arr[i] > *max_val)
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{
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*max_val = arr[i];
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max_p = i;
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}
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}
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return max_p;
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}
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uint16_t find_echo_position(uint16_t max_val,uint16_t max_val_position,uint16_t* arr,uint16_t len)
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{
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uint16_t i=0;
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uint32_t max_val_zero;
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max_val_zero = max_val - 2048 ;
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//uint16_t echo_position = 0;
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// 最大值的0.1倍
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uint16_t max_val_zero_0R1 = (max_val_zero*8/100)+2048;
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// 最大值的0.3倍
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uint16_t max_val_zero_0R3 = (max_val_zero*40/100)+2048;
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if(max_val_position>200)
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{
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i = max_val_position-200;
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}else
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{
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i = 0;
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}
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for(; i < max_val_position;i++)
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{
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// 判断是否是顶点
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//if( arr[i-2]<arr[i-1] && arr[i-1] <= arr[i] && arr[i]>=arr[i+1] && arr[i+1]>arr[i+2])
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//
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if( arr[i-1] < arr[i] && arr[i]> arr[i+1])
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{
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// 减去偏置电压
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//temp_val_zero = arr[i]-2048;
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// 判断顶点是否在 10%-%30之间。
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if(arr[i] >= max_val_zero_0R1 && arr[i] <= max_val_zero_0R3 )
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{
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// 如果找到 函数推出
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return i;
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}
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}
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}
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// 如果没有找到 返回0;
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return 0;
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}
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