• cpu_irq_critical_section_counter : interrupt_sam_nvic.h
• cpu_irq_prev_interrupt_state : interrupt_sam_nvic.h
• g_pdc_tx_packet : pwm_sync_example.c
• g_us_duty_buffer : pwm_sync_example.c
• gs_interrupt_sources : pio_handler.c
• gs_ul_nb_sources : pio_handler.c
• ptr_get : read.c , stdio_serial.h
• ptr_put : write.c , stdio_serial.h
• stdio_base : read.c , stdio_serial.h , write.c