what is the low/high level for the P1.5 capture
/* For receive, this module uses TMR32B0-CAP0 input (capture and interrupt on both edges) */
/* TMR32B0-CAP0 input (P1.5) is connected to P1.1 (to check high / low level by software) */
/* So set P1.5 as CT32B0.CAP0 (= DALI receive pin). Bit 7:6 (reserved) are also set to 1 */
#define DALI_ConfigInput() { LPC_IOCON->PIO1_5 = 0xD2; }