Just got my ARM LPC2148 Dev Board from Olimex
I put together a small overview how to get things working using a linux host system.
Toolchain
GNU Compiler Toolchain
Serial Programmer
Sample Code
Crt0
Linkerscript
Init Routine
Simple IO Test
SIO Debug Console
GNU Compiler Toolchain
I use a standard arm GNU toolchain. Actuallay found this binary download from mikrocontroller.net. But also my GBA Toolchain worked and produced good binaries. So a Gentoo ARM Crossdev should to the work.
Think that the LPC is not too picky about that.
Serial Programmer
I tried lpc21isp but it didn’t work for me. So i ended up using lpc2k_pgm. It has little gui and where you can setup all needed configs. I use iHex format to upload to the dev board, where i had best results using quite slow sio speed like 9600bps. You have to enable BSL on the LPC2148 for ICSP. On my LPC the switch is called ‘ICSP1′ which needs to be set into ON position.
Crt0
Nothing special about that. Took it from similar LPC based projects.Just setup stack sizes and default IRQ
vectors. Worked out of the box.
Linkerscript
Tooks this from a other LPC project. The script specifies the memory layout of the target system and defines the sections for the binary output.
Init Routine
Code found in startup.c does the PLL init. The LPC2148 has 12 Mhz internal crystal but can run up to 60Mhz when setting the PLL. Also the default IRQ Handlers are defined here.
Simple IO Test
I used the on-board leds for a simple IO test.
int main(void)
{
unsigned int i;
Initialize();
ConsoleInit(60000000 / (16 * BAUD_RATE));
puts("Init done\n");
IODIR0 |= 1 < < 10; // P0.10 is an output
IODIR0 |= 1 << 11; // P0.10 is an output
IOSET0 = 1 << 10; //LED off
IOSET0 = 1 << 11; //LED off
while (1) {
for (i = 0; i < 1000000; i++);
IOSET0 = 1 << 10; //LED off
IOCLR0 = 1 << 11; //LED on
puts("led1: off led2: on\n");
for (i = 0; i < 1000000; i++);
IOCLR0 = 1 << 10; //LED on
IOSET0 = 1 << 11; //LED off
puts("led1: on led2: off\n");
}
}
SIO Debug Console
Addes a little module that uses one of the two serial line for debugging output. I use the same serial port as for for the ICSP, so after the flashing lpc2k_gpm will display the output directly without any setup changes.
download source
