Here are the data structures with brief descriptions:
 dfll_config | Hardware-specific representation of DFLL configuration |
 genclk_config | Hardware representation of a set of generic clock parameters |
 pdca_channel_config_t | PDCA channel options |
 pll_config | Hardware-specific representation of PLL configuration |
 sam4l_status_msg_t | |
 sam4l_status_t | |
 sam_usart_opt_t | |
 StructCPtr | Structure of pointers to constant 64-, 32-, 16- and 8-bit unsigned integers |
 StructCVPtr | Structure of pointers to constant volatile 64-, 32-, 16- and 8-bit unsigned integers |
 StructPtr | Structure of pointers to 64-, 32-, 16- and 8-bit unsigned integers |
 StructVPtr | Structure of pointers to volatile 64-, 32-, 16- and 8-bit unsigned integers |
 twim_config | Input parameters when initializing the TWIM module mode |
 twim_package | Information concerning the data transmission |
 uart_rs232_options | Input parameters when initializing RS232 and similar modes |
 Union16 | 16-bit union |
 Union32 | 32-bit union |
 Union64 | 64-bit union |
 UnionCPtr | Union of pointers to constant 64-, 32-, 16- and 8-bit unsigned integers |
 UnionCVPtr | Union of pointers to constant volatile 64-, 32-, 16- and 8-bit unsigned integers |
 UnionPtr | Union of pointers to 64-, 32-, 16- and 8-bit unsigned integers |
 UnionVPtr | Union of pointers to volatile 64-, 32-, 16- and 8-bit unsigned integers |
 usart_iso7816_opt_t | |
 usart_spi_opt_t | |
 wdt_config | Watchdog Timer configuration structure |
 wdt_dev_inst | Watchdog Timer driver software instance structure |