the pin(PIO0_11) of LPC1114 is always high.

[liufeng123]

i use the gerneral io mode,bue the pin(PIO0_11) is always high.

i want to get the low voltage,so the test programs is as follows:

LPC_IOCON->JTAG_TDI_PIO0_11 &= ~0x1F;
LPC_IOCON->JTAG_TDI_PIO0_11 |= (1<<4);
LPC_GPIO0->DIR=(1<<11);
LPC_GPIO0->DATA &=~(1<<11);

but the voltage of pin(PIO0_11) is always high.

[victorjimenez]

Hi Liu Feng,

For the example please see the LPCOpen for the LPC1114. There you will find different examples where you can see how the configurations of the pins are made. I highly recommend you to use the drivers provided in the LPCOpen. 

Please let me know if you have any more questions or doubts. 

Victor.

[liufeng123]

furthermore,we test the register ( IOCON_JTAG_TDI_PIO0_11 ),when the chip begin to power,the register value of IOCON_JTAG_TDI_PIO0_11 is 0XD0,when we change the register to general io mode ,the register value will change to 0XD0,so i think the register set is ok.

[liufeng123]

some project engineers advise me to close the jtag function,but i dont know how to close the jtag function,if the problem is the indeed,please give me the sample example.