blinky.zip、gcc 部分、Teensy++ v.2 中的说明。Makefile 和 blinky.c 在 zip 中。我在开始时通过定义 F_CPU 修改了 blinky.c,因为没有使用 Makefile,请参见下文。那么为什么会出现错误以及如何为 at90usb1286 芯片编译 C 文件?
$ avr-gcc -mmcu=atmega88 blinky.c
In file included from blinky.c:28:
/usr/local/lib/gcc/avr/4.2.2/../../../../avr/include/util/delay.h:90:3: warning: #warning "Compiler optimizations disabled; functions from <util/delay.h> won't work as designed"
/tmp//ccB66ecl.o: In function `main':
blinky.c:(.text+0x3e): undefined reference to `usb_init'
/tmp//ccB66ecl.o: In function `morse_character':
blinky.c:(.text+0x24c): undefined reference to `print_P'
blinky.c:(.text+0x36e): undefined reference to `print_P'
blinky.c:(.text+0x378): undefined reference to `usb_debug_putchar'
blinky.c:(.text+0x37e): undefined reference to `print_P'
blinky.c:(.text+0x386): undefined reference to `print_P'
blinky.c:(.text+0x390): undefined reference to `usb_debug_putchar'
blinky.c:(.text+0x394): undefined reference to `usb_debug_putchar'
blinky.c:(.text+0x416): undefined reference to `print_P'
blinky.c:(.text+0x4fa): undefined reference to `print_P'
blinky.c:(.text+0x6f8): undefined reference to `print_P'
/tmp//ccB66ecl.o: In function `morse_P':
blinky.c:(.text+0x834): undefined reference to `print_P'