1- Prerequisites IAR Embedded Workbench for ARM 7.30 2- Selecting between USB and UART interface Set the define SAM_BA_INTERFACE to SAM_BA_UART_ONLY for only UART interface SAM_BA_USBCDC_ONLY for only USB CDC interface SAM_BA_BOTH_INTERFACES for enabling both the interfaces SAM_BA_INTERFACE value should be modified in Project Options -> C/C++ Compiler -> Preprocessor -> Defined symbols Project Options -> Assembler -> Preprocessor -> Defined symbols 3- Start application check Bootloader checks for the state of BOOT_LOAD_PIN (configurable by the user from main.h). If BOOT_LOAD_PIN is pulled low, bootloader execution is resumed. Else, the first location of application is fetched and checked. If it is empty (0xFFFFFFFF), then bootloader execution is resumed. Else it jumps to application and starts execution from there. Currently, BOOT_LOAD_PIN is PA15 of SAMD21G18A, pin 5 of Arduino Zero board.
Cristian Maglie
authored
For some reason the blocking read from the original USB-CDC driver is not reliable. As a workaround it has been reimplemented using a polling loop with the non-blocking read function that, instead, is much more reliable. Eventually the USB_Read_blocking(..) in cdc_enumerate.c will be fixed in the future.
| Name | Last commit | Last update |
|---|---|---|
| .. | ||
| drivers | ||
| utils | ||
| Makefile | ||
| main.c | ||
| main.h | ||
| readme.txt | ||
| sam_ba_monitor.c | ||
| sam_ba_monitor.h | ||
| samd21_sam_ba.bin | ||
| samd21j18a_flash.ld | ||
| startup_samd21.c | ||
| usart_sam_ba.c | ||
| usart_sam_ba.h | ||