2011-8-7 13:52:49

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2011-8-7 13:52:49

blob是如何响应按键的？

typedef unsigned long XLLP_UINT32_T, *P_XLLP_UINT32_T;

xllp的状态

XLLP_STATUS_T XllpReadScanCode(
XLLP_KEYPAD_REGS *v_pkeypad_regs,
XLLP_UINT8_T *pui8_data)
{

XLLP_UINT32_T kp_status;
XLLP_UINT8_T key = NO_KEY;

#ifdef XLLP_DEBUG_PARAM_CHECK
if ( NULL == v_pkeypad_regs||NULL == pui8_data)
return XLLP_STATUS_WRONG_PARAMETER;
#endif

kp_status = v_pkeypad_regs->kpControlReg;

首先读控制寄存器

/*
Process matrix first to capture scroll
wheel press rather than interpreting it
as a rotate, which can happen unintentionally.
*/

if(kp_status & MATRIX_INTR_BIT) {
  read_scan_code_automatically(v_pkeypad_regs,&key);
  if(key == NO_KEY) {
   *pui8_data = NO_KEY;
   return(XLLP_STATUS_FAILURE);
  }
  key = xllpKpScanCodeLut[key];
}else if(kp_status & DIRECT_INTR_BIT ) {
  read_direct_keys(v_pkeypad_regs,&key);
}
*pui8_data = key;

if(key == NO_KEY){
return(XLLP_STATUS_FAILURE);
}
else{
return(XLLP_STATUS_SUCCESS);
}
}/*end function XllpReadScanCode*/

save_kp_rotary_encoder_count_reg =
v_pkeypad_regs->kpRotaryEncoderCountReg;
curr_count = save_kp_rotary_encoder_count_reg & COUNT_MASK;

获取旋转编码计数

read_direct_keys

只是获取上滚下滚？

read_scan_code_automatically

获取一个行列扫描码

也就是说 XllpReadScanCode 返回了按键的键值

这个函数没有地方调用？？？