In this part, we are going to organize and clean our LED blink example that we wrote in the Part-1 and automate the building process using GNU Make. Complete source code is also available on this GitHub Repo.
We start by creating a directory named ch559. Inside directory ch559 will make another directory lib and examples. The final directory structure will look similar to the image shown below.
Under the lib directory, we will create a header file ch559.h in which will put all the register definitions using SFR and SBIT macros.
--------------------------- ch559.h ---------------------------
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| #ifndef __CH559_H__
#define __CH559_H__
#include <compiler.h>
/* Port Registers */
SFR(P1, 0x90); // port 1 input & output
SBIT(P1_7, 0x90, 7);
SBIT(P1_6, 0x90, 6);
SBIT(P1_5, 0x90, 5);
SBIT(P1_4, 0x90, 4);
SBIT(P1_3, 0x90, 3);
SBIT(P1_2, 0x90, 2);
SBIT(P1_1, 0x90, 1);
SBIT(P1_0, 0x90, 0);
SFR(P1_DIR, 0xBA); // port 1 direction
SFR(PORT_CFG, 0xC6); // port 0/1/2/3 config
#endif // __CH559_H__
|
Now we will create Makefile.include file under the examples directory and put the make scripts that are common for all examples.
----------------------- Makefile.include ----------------------
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| #######################################################
# toolchain
CC = sdcc
OBJCOPY = objcopy
PACK_HEX = packihx
WCHISP = wchisptool
#######################################################
ifndef FREQ_SYS
FREQ_SYS = 16000000
endif
ifndef XRAM_SIZE
XRAM_SIZE = 0x1800
endif
ifndef XRAM_LOC
XRAM_LOC = 0x0000
endif
ifndef CODE_SIZE
CODE_SIZE = 0xF000
endif
ROOT_DIR := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
CFLAGS := -V -mmcs51 --model-small \
--xram-size $(XRAM_SIZE) --xram-loc $(XRAM_LOC) \
--code-size $(CODE_SIZE) \
-I$(ROOT_DIR)../lib -DFREQ_SYS=$(FREQ_SYS) \
$(EXTRA_FLAGS)
LFLAGS := $(CFLAGS)
RELS := $(C_FILES:.c=.rel)
print-% : ; @echo $* = $($*)
%.rel : %.c
$(CC) -c $(CFLAGS) $<
$(TARGET).ihx: $(RELS)
$(CC) $(notdir $(RELS)) $(LFLAGS) -o $(TARGET).ihx
$(TARGET).hex: $(TARGET).ihx
$(PACK_HEX) $(TARGET).ihx > $(TARGET).hex
$(TARGET).bin: $(TARGET).ihx
$(OBJCOPY) -I ihex -O binary $(TARGET).ihx $(TARGET).bin
flash: $(TARGET).bin pre-flash
$(WCHISP) -f $(TARGET).bin -g
.DEFAULT_GOAL := all
all: $(TARGET).bin $(TARGET).hex
clean:
rm -f \
$(notdir $(RELS:.rel=.asm)) \
$(notdir $(RELS:.rel=.lst)) \
$(notdir $(RELS:.rel=.mem)) \
$(notdir $(RELS:.rel=.rel)) \
$(notdir $(RELS:.rel=.rst)) \
$(notdir $(RELS:.rel=.sym)) \
$(notdir $(RELS:.rel=.adb)) \
$(TARGET).lk \
$(TARGET).map \
$(TARGET).mem \
$(TARGET).ihx \
$(TARGET).hex \
$(TARGET).bin
|
We will put our LED blink example under the examples directory. Create directory blink under examples. Now make two files blink.c and Makefile.
--------------------------- blink.c ---------------------------
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| // Blink a LED connected to pin 1.6
#include <stdint.h>
#include <ch559.h>
static inline void delay() {
uint32_t i;
for (i = 0; i < (120000UL); i++){}
__asm__("nop");
}
void main() {
PORT_CFG = 0b00101101;
P1_DIR = 0b11110000;
P1 = 0x00;
while (1) {
delay();
P1_6 = !P1_6;
}
}
|
-------------------------- Makefile ---------------------------
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| TARGET = blink
C_FILES = \
blink.c
include ../Makefile.include
|
Its time to build our LED Blink example. Goto the blink directory and execute the command make. This will compile our example and produce a binary file for programming the CH559 board.
