I am using the ARM7_AT91SAM7X256_Eclipse demo on SAM7X platform. I realized the demo does not include API that can send data through serial debug port. I just need to send one byte character to my desktop through serial debug port whenever I need. Does anybody have a simple initialization routine and write API (e.g., putChar API) that I can use along with ARM7_AT91SAM7X256_Eclipse demo? Thanks,

Most demos come with a serial.c file and include the comtest.c demo tasks. The functions in there will do what you what. Otherwise, as this is a SAM7 question and not an RTOS question you are better off asking on an Atmel forum.