LPC_IOCON->R_PIO1_0 &= ~0x07;
LPC_IOCON->R_PIO1_0 |= 0x02;
The above statement sets P1.0 to AD1. The lower three bits of P1.0 are the pin function selection bits, so you can configure the pin function by configuring the lower three bits. For specific functions, see the IOCON register definition section of the lpc1114 user manual.
Many students don’t understand why the first statement should be added. The answer is as follows:
The first statement is used to clear the lower three bits, that is, to set the lower three bits to 0; the second statement is to set bit1 to 1, setting it to AD1 function. If there is no first statement, if bit0 is 1 before, after executing the second statement, the final result is that both bit0 and bit1 are 1, which is not the AD1 function you want to configure.
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