250 lines
5.0 KiB
C
250 lines
5.0 KiB
C
#include "BoardCfg.h"
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/**********************************************************
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行注释
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内容：HAL层
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DOUT MISO C7
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DIN MOSI A10
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CS M20
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CLK A9
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**********************************************************/
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void XPY2046Init()
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{
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GPIO_Init(GPIOA, PIN10, 1, 0, 0);
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GPIO_Init(GPIOA, PIN9, 1, 0, 0);
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GPIO_Init(GPIOM, PIN20, 1, 0, 0);
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GPIO_Init(GPIOC, PIN7, 0, 1, 0);
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}
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/**
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* @brief XTP DOUT线操作
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*
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* @param val 0/1
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*/
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static void XPT2046_DOUT_Write(u8 val)
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{
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if (val)
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{
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GPIO_SetBit(GPIOA, PIN10);
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}
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else
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{
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GPIO_ClrBit(GPIOA, PIN10);
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}
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}
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/**
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* @brief XTP CLK线操作
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*
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* @param val 0/1
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*/
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static void XPT2046_CLK_Write(u8 val)
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{
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if (val)
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{
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GPIO_SetBit(GPIOA, PIN9);
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}
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else
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{
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GPIO_ClrBit(GPIOA, PIN9);
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}
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}
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/**
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* @brief XTP DIN线操作
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*
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* @param val 0/1
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*/
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static u8 XPT2046_DIN_Read()
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{
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return GPIO_GetBit(GPIOC, PIN7);
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}
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/**
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* @brief XTP CS线操作
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*
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* @param val 0/1
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*/
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static void XPT2046_CS_Write(u8 val)
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{
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if (val)
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{
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GPIO_SetBit(GPIOM, PIN20);
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}
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else
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{
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GPIO_ClrBit(GPIOM, PIN20);
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}
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}
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/**
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* @brief 延迟1us
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* interface
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* @param time
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*/
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static void DelayUs(u32 time)
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{
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for (u32 i = 0; i < time; i++)
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{
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for (u32 j = 0; j < 1000; j++)
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{
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__ASM("nop");
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}
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}
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}
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u8 CMD_RDX = 0XD0;
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u8 CMD_RDY = 0X90;
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/**********************************************************
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行注释
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内容：
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**********************************************************/
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static void TP_Write_Byte(u8 num)
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{
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u8 count = 0;
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for (count = 0; count < 8; count++)
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{
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if (num & 0x80)
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XPT2046_DOUT_Write(1);
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else
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XPT2046_DOUT_Write(0);
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num <<= 1;
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XPT2046_CLK_Write(0);
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DelayUs(1);
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XPT2046_CLK_Write(1);
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}
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}
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u16 TP_Read_AD(u8 CMD)
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{
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u8 count = 0;
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u16 Num = 0;
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XPT2046_CLK_Write(0); //先拉低时钟
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XPT2046_DOUT_Write(0); //拉低数据线
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XPT2046_CS_Write(0); //选中触摸屏IC
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TP_Write_Byte(CMD); //发送命令字
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DelayUs(6); // ADS7846的转换时间最长为6us
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XPT2046_CLK_Write(0);
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DelayUs(1);
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XPT2046_CLK_Write(1); //给1个时钟，清除BUSY
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DelayUs(1);
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XPT2046_CLK_Write(0);
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for (count = 0; count < 16; count++) //读出16位数据,只有高12位有效
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{
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Num <<= 1;
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XPT2046_CLK_Write(0); //下降沿有效
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DelayUs(1);
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XPT2046_CLK_Write(1);
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if (XPT2046_DIN_Read())
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Num++;
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}
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Num >>= 4; //只有高12位有效.
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XPT2046_CS_Write(1); //释放片选
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return (Num);
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}
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#define READ_TIMES 1 //读取次数
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#define LOST_VAL 0 //丢弃值
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u16 TP_Read_XOY(u8 xy)
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{
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u16 i, j;
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u16 buf[READ_TIMES];
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u16 sum = 0;
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u16 temp;
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for (i = 0; i < READ_TIMES; i++)
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buf[i] = TP_Read_AD(xy);
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for (i = 0; i < READ_TIMES - 1; i++) //排序
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{
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for (j = i + 1; j < READ_TIMES; j++)
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{
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if (buf[i] > buf[j]) //升序排列
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{
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temp = buf[i];
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buf[i] = buf[j];
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buf[j] = temp;
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}
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}
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}
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sum = 0;
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for (i = LOST_VAL; i < READ_TIMES - LOST_VAL; i++)
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sum += buf[i];
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temp = sum / (READ_TIMES - 2 * LOST_VAL);
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return temp;
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}
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/**
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* @brief XPT2046读取X，Y
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* (interface)
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* @param x x坐标
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* @param y y坐标
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* @return u8
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*/
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u8 TP_Read_XY(u16 *x, u16 *y)
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{
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u16 xtemp, ytemp;
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xtemp = TP_Read_XOY(CMD_RDX);
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ytemp = TP_Read_XOY(CMD_RDY);
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// if(xtemp<100||ytemp<100)return 0;//读数失败
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*x = xtemp;
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*y = ytemp;
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return 1; //读数成功
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}
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/**
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* @brief 二次函数拟合
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* y = kx +b
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* y1 = kx1+b
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* y2 = kx2+b
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* y1-y2 = k(x1-x2)
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* k = (y1-y2)/(x1-x2)
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* b = y1-kx1
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* @param iniput
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* @param x1
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* @param y1
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* @param x2
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* @param y2
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* @return u16
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*/
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static u16 ChangeCoordinate(u16 input, float x1, float y1, float x2, float y2)
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{
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float k = (y1 - y2) / (x2 - x1);
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float b = y1 - k * x1;
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float result = k * (float)input + b;
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return (u16)result;
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}
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#define AVG_XOY 5
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/**
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* @brief 获取电阻屏的坐标
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* interface out
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* @param x x坐标
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* @param y y坐标
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* @return u8 0:没有触摸，1：按下
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* (0,0)->(3970,3780)
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* (800,480)->(100,200)
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* (3870/800)
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*
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*/
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u8 GetXY(u16 *x, u16 *y)
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{
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u16 tempX = 0, tempY = 0;
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static u16 lastX,lastY;
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TP_Read_XY(&tempX,&tempY);
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// if(tempX-lastX>50||tempY-lastY>50){
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// lastX = tempX;
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// lastY = tempY;
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// return 0;
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// }
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// for(u16 i=0;i<AVG_XOY;i++){
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// u16 ttx,tty;
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// TP_Read_XY(&ttx,&tty);
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// tempX+=ttx;
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// tempY+=tty;
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// }
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// tempX = tempX/AVG_XOY;
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// tempY = tempY/AVG_XOY;
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if (tempX == 0)
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{
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return 0;
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}
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*x = ChangeCoordinate(tempX, 3970.0, 0.0, 100.0, 800.0);
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*y = ChangeCoordinate(tempY, 3780.0, 0.0, 200.0, 480.0);
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// Printf("tempX:%d,tempY:%d\n", *x, *y);
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return 1;
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} |