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*** ../CMSIS_5/Device/ARM/ARMCM3/Source/GCC/gcc_arm.ld	2017-03-09 18:07:02.000000000 -0500
--- LPC1768.ld	2017-03-09 18:53:18.000000000 -0500
***************
*** 2,8 ****
  MEMORY
  {
    FLASH (rx)  : ORIGIN = 0x00000000, LENGTH = 512K
!   RAM   (rwx) : ORIGIN = 0x20000000, LENGTH = 256K
  }
  

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#define P1_18_SEL (1 << 5) | (1 << 4)   /* Pin 1.18 = LED1 */
#define P1_20_SEL (1 << 9) | (1 << 8)   /* Pin 1.20 = LED2 */ 
#define P1_21_SEL (1 << 11) | (1 << 10) /* Pin 1.21 = LED3 */
#define P1_23_SEL (1 << 15) | (1 << 14) /* Pin 1.23 = LED4 */

...
  
  /* Set the pins to GPIO by setting the associated bits to 00 (p119)
   */
  LPC_PINCON->PINSEL3 &= (unsigned) ~(P1_18_SEL | P1_20_SEL | P1_21_SEL | P1_23_SEL);

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#define P18 (1 << 18)
#define P20 (1 << 20)
#define P21 (1 << 21)
#define P23 (1 << 23)

#define ALL (P18 | P20 | P21 | P23)

...
  
  /* Set the direction as output by setting the associated bits

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  /* Turn the LEDs on and off at roughly 1Hz.
   */
  while (1) {
    LPC_GPIO1->FIOSET |= ALL; /* p132 */
    delay_ms(500);
    LPC_GPIO1->FIOCLR |= ALL; /* p132 */
    delay_ms(500);
  }

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# https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/ARM-Options.html
ARM_FLAGS = \
	-mthumb \
	-mcpu=cortex-m3

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# https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Warning-Options.html
WARNING_FLAGS = \
	-Wall \
	-Wextra \
	-pedantic \
	-Wbad-function-cast \
	-Wconversion \
	-Wfloat-equal \
	-Wlogical-op \
	-Wmissing-declarations \

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# https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Preprocessor-Options.html
CPPFLAGS = \
	-MMD \
	-MF"$(@:%.o=%.d)" \
	-MT"$(@)"

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# Define DEBUG to anything if you want debug enabled.
#
# https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Optimize-Options.html#Optimize-Options
# http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0205g/Bgbjjgij.html
# https://mcuoneclipse.com/2015/05/27/semihosting-for-kinetis-design-studio-v3-0-0-and-gnu-arm-embedded-launchpad/
DEBUG=
ifdef DEBUG
	OPTIMIZE=-Os -g -DDEBUG
	RDIMONSPECS = --specs=rdimon.specs
	RDIMONLIB = -lrdimon

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# https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Diagnostic-Message-Formatting-Options.html
# https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/C-Dialect-Options.html#C-Dialect-Options
# https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Code-Gen-Options.html
ASFLAGS = \
	$(ARM_FLAGS) \
	$(WARNING_FLAGS) \
	-fmessage-length=0 \
	$(OPTIMIZE) \
	-ffunction-sections \
	-fdata-sections \

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# https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Link-Options.html
LDFLAGS = \
	-nodefaultlibs \
	-T "LPC1768.ld" \
	-Wl,--gc-sections \
	-Wl,-Map,"BBB.map" \
	-Wl,--start-group -lgcc -lc -lm $(RDIMONLIB) -Wl,--end-group