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TMS320F28035的GPIO口配置为通用IO口时,如下:
// GPIO-42 - PIN FUNCTION = --Spare--
GpioCtrlRegs.GPBMUX1.bit.GPIO42 = 0; // 0=GPIO, 1=Resv, 2=Resv, 3=COMP1OUT
GpioCtrlRegs.GPBDIR.bit.GPIO42 = 1; // 1=OUTput, 0=INput
GpioDataRegs.GPBCLEAR.bit.GPIO42 = 1; // uncomment if --> Set Low initially
首次上电,GpioDataRegs.GPBDAT.bit.GPIO42是什么状态,是0呢还是1呢?
还请大侠给出答案和解释,如果是不定状态,并且要是实现上电时为确定状态:1或0时,是不是要再外部配上拉或下拉呢?