(Kinetis K60)TSI触摸感应……

偶然发现kinetis有个TSI寄存器……作为屌丝 果断体验鸟ipad的触摸赶脚~

关于电容触摸屏原理……手指接近会导致振荡器频率的变化

main.c

#include "LED.h"


void TSI_Init(void);
void TSI_SelfAdjust(void);

volatile U16 Adjust[4];

void main(void)
{

    DisableInterrupts; 

    TSI_Init();
   
    init_LED();
   
    TSI_SelfAdjust();

    EnableInterrupts;
 
    while(1);   
}

void TSI_Init(void)
{
    SIM_SCGC5 |= (SIM_SCGC5_TSI_MASK | SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK);
 
    PORTA_PCR4 = PORT_PCR_MUX(0);     
    PORTB_PCR2 = PORT_PCR_MUX(0);     
    PORTB_PCR3 = PORT_PCR_MUX(0);     
    PORTB_PCR16 = PORT_PCR_MUX(0);   

    TSI0_GENCS |= (TSI_GENCS_NSCN(10) | TSI_GENCS_PS(3)); //扫描数  振荡器分频
    TSI0_SCANC |= (TSI_SCANC_EXTCHRG(3) | TSI_SCANC_REFCHRG(31) | TSI_SCANC_DELVOL(7) | TSI_SCANC_SMOD(0) | TSI_SCANC_AMPSC(0));
              //外部电流                  参考电流                电压                  连续扫描            输入时钟分频
    TSI0_PEN = TSI_PEN_PEN5_MASK | TSI_PEN_PEN7_MASK | TSI_PEN_PEN8_MASK | TSI_PEN_PEN9_MASK;
              //打开相应TSI通道
    TSI0_GENCS |= TSI_GENCS_TSIEN_MASK;  //打开TSI中断

    enable_irq(83); 
    
}

void TSI_SelfAdjust(void) //自校正
{
    TSI0_GENCS |= TSI_GENCS_SWTS_MASK;         //软触发启动
    while(!TSI0_GENCS & TSI_GENCS_EOSF_MASK);  //等待扫描结束
    Delay(300);

    //TSIx_CNTRn 高十六位存储的是通道n三角计数的值 低16位存储通道(n-1)的值
    Adjust[0] = (TSI0_CNTR5>>16)&0x0000FFFF;  
    Adjust[1] = (TSI0_CNTR7>>16)&0x0000FFFF;
    Adjust[2] = (TSI0_CNTR9)&0x0000FFFF;
    Adjust[3] = (TSI0_CNTR9>>16)&0x0000FFFF;


    TSI0_GENCS &= ~TSI_GENCS_TSIEN_MASK;  //关闭TSI

    TSI0_GENCS |= TSI_GENCS_STM_MASK;       
    TSI0_GENCS |= (TSI_GENCS_TSIIE_MASK|TSI_GENCS_ESOR_MASK);
    TSI0_GENCS |= TSI_GENCS_TSIEN_MASK;     
   
}

中断服务函数

#include "isr.h"
#include "LED.h"

#define VALVE1 800
#define VALVE2 800
#define VALVE3 800
#define VALVE4 800

extern volatile U16 Adjust[4];

U8 LED_1 = 1,LED_2 = 1,LED_3 = 1,LED_4 = 1;

void TSI_isr(void)
{
    U16 NOWCounter;
 
    TSI0_GENCS |= TSI_GENCS_OUTRGF_MASK;  //清除数据
    TSI0_GENCS |= TSI_GENCS_EOSF_MASK;    //扫描

    NOWCounter = (TSI0_CNTR5>>16)&0x0000FFFF -VALVE1;  //获取周期 
   
    if(NOWCounter>Adjust[0])
    {
        Delay(10);  //延迟消抖
        NOWCounter = (TSI0_CNTR5>>16)&0x0000FFFF -VALVE1;
        if(NOWCounter>Adjust[0])
        {
            LED_1 = !LED_1;
            LED1(LED_1);
            while(NOWCounter>Adjust[0])
                NOWCounter = (TSI0_CNTR5>>16)&0x0000FFFF -VALVE1;        
        }
    }
   
   
    NOWCounter = (TSI0_CNTR7>>16)&0x0000FFFF -VALVE2;        
   
    if(NOWCounter>Adjust[1])
    {
        Delay(10);
        NOWCounter = (TSI0_CNTR7>>16)&0x0000FFFF -VALVE2;        
        if(NOWCounter>Adjust[1])
        {
            LED_2 = !LED_2;
            LED2(LED_2);
            while(NOWCounter>Adjust[1])
                NOWCounter = (TSI0_CNTR7>>16)&0x0000FFFF -VALVE2;        
        }
    }

    NOWCounter = (TSI0_CNTR9)&0x0000FFFF -VALVE3;
   
    if(NOWCounter>Adjust[2])
    {
        Delay(10);
        NOWCounter = (TSI0_CNTR9)&0x0000FFFF -VALVE3;   
        if(NOWCounter>Adjust[2])
        {
            LED_3 = !LED_3;
            LED3(LED_3);
            while(NOWCounter>Adjust[2])
                NOWCounter = (TSI0_CNTR9)&0x0000FFFF -VALVE3;        
        }
    }   
 
    NOWCounter = (TSI0_CNTR9>>16)&0x0000FFFF -VALVE4;        
   
    if(NOWCounter>Adjust[3])
    {
        Delay(10);
        NOWCounter = (TSI0_CNTR9>>16)&0x0000FFFF -VALVE4;        
        if(NOWCounter>Adjust[3])
        {
            LED_4 = !LED_4;
            LED4(LED_4);
            while(NOWCounter>Adjust[3])
                NOWCounter = (TSI0_CNTR9>>16)&0x0000FFFF -VALVE4;        
        }
    }    
   
    TSI0_STATUS = 0xFFFFFFFF;
}