Difference between revisions of "micro:bit"
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instead to build FPC for the controller used by the micro:bit. | instead to build FPC for the controller used by the micro:bit. | ||
| − | Now enter the following program | + | Now enter the following program: |
const | const | ||
| Line 33: | Line 33: | ||
end. | end. | ||
| − | and compile it with: | + | save it as example.pp and compile it with: |
fpc -Parm -Tembedded -Wpnrf51822_xxaa example -Cparmv6m | fpc -Parm -Tembedded -Wpnrf51822_xxaa example -Cparmv6m | ||
Revision as of 12:31, 18 February 2017
The micro:bit is a small embedded system equipped with a Nordic Semiconductor nRF51822 controller based on the Cortex-M0 architecture. With FPC trunk, it is possible to build programs for it. Follow the instructions at [1] to setup FPC for the target arm-embedded. However, do not use the provided command line to build and install FPC but use
make clean buildbase installbase CROSSINSTALL=1 OS_TARGET=embedded CPU_TARGET=arm SUBARCH=armv6m
instead to build FPC for the controller used by the micro:bit.
Now enter the following program:
const
GPIO_PIN_CNF_INPUT_Disconnect = 1;
GPIO_PIN_CNF_DIR_Output = 1;
microbit_led_col1 = 4;
microbit_led_row1 = 13;
var
i : longint;
begin
GPIO.PIN_CNF[microbit_led_col1]:=(GPIO_PIN_CNF_INPUT_Disconnect shl 1) or GPIO_PIN_CNF_DIR_Output;
GPIO.PIN_CNF[microbit_led_row1]:=(GPIO_PIN_CNF_INPUT_Disconnect shl 1) or GPIO_PIN_CNF_DIR_Output;
while true do
begin
GPIO.OUTSET:=1 shl microbit_led_row1;
GPIO.OUTCLR:=1 shl microbit_led_col1;
for i:=1 to 500000 do
asm
nop
end;
GPIO.OUTCLR:=1 shl microbit_led_row1;
for i:=1 to 500000 do
asm
nop
end;
end;
end.
save it as example.pp and compile it with:
fpc -Parm -Tembedded -Wpnrf51822_xxaa example -Cparmv6m
When connecting a micro:bit to PC, it identifies itself as an USB drive. Find out where this drive is located and copy the resulting example.hex to this drive.
If everything worked fine, the upper left LED will blink.
