structure.c

launchpad msp430官方示例

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 *  structure.c    
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//******************************************************************************
// structure.c
//
// RO_PINOSC_TA0_One_Button_Compact example
// Touch the middle element to turn on/off the center button LED
// Uses the low-level API function calls for reduced memory footprint.
// Note: Baseline tracking is implemented in the Application Layer
// RO method capactiance measurement using PinOsc IO, TimerA0, and WDT+
//
//******************************************************************************
//
//******************************************************************************

#include "structure.h"


//PinOsc Wheel: middle button P2.5
const struct Element middle_element = {

              .inputPxselRegister = (uint8_t *)&P2SEL,  
              .inputPxsel2Register = (uint8_t *)&P2SEL2,  
              .inputBits = BIT5,
              // When using an abstracted function to measure the element
              // the 100*(maxResponse - threshold) < 0xFFFF
              // ie maxResponse - threshold < 655
              .maxResponse = 350+655,
              .threshold = 350
}; 

//*** CAP TOUCH HANDLER *******************************************************/
// This defines the grouping of sensors, the method to measure change in
// capacitance, and the function of the group
const struct Sensor middle_button =
               { 
                  .halDefinition = RO_PINOSC_TA0_WDTp,
                  .numElements = 1,
                  .baseOffset = 0,
                  // Pointer to elements
                  .arrayPtr[0] = &middle_element,  // point to first element
                  // Timer Information
                  .measGateSource= GATE_WDTp_ACLK,     //  0->SMCLK, 1-> ACLK
                  //.accumulationCycles= WDTp_GATE_32768             //32768
                  //.accumulationCycles= WDTp_GATE_8192               // 8192
                  //.accumulationCycles= WDTp_GATE_512             //512
                  .accumulationCycles= WDTp_GATE_64             //64                  
               };