USB PIC Bootloader. User Manual

To ease software development, all bootloader responses are described as structures.

As interface between PC and Bootloader supports only packages of fixed size, all structures are boot_rsp union members:

typedef union
{
/*
 * data field is used to make all responses the same length
 */
   unsigned char data[BOOT_RSP_SIZE];
   boot_rsp_header header;
   boot_rsp_read_flash read_flash;
   boot_rsp_write_flash write_flash;
   boot_rsp_erase_flash erase_flash;
   boot_rsp_fw_ver get_fw_ver;
   boot_rsp_read_id read_id;
   boot_rsp_write_id write_id;
   boot_rsp_read_eeprom read_eeprom;
   boot_rsp_write_eeprom write_eeprom;
} boot_rsp;

All other fields are used to access the particular response parameters.