commit 9cdcea9b9982dc7affe5b89d02fb6b158581b7f5
parent 7bb36226a923999794652ad9cb96e7e0606cc76c
Author: Matsuda Kenji <info@mtkn.jp>
Date: Sat, 2 Mar 2024 07:13:02 +0900
use c file. no problem
Diffstat:
4 files changed, 79 insertions(+), 64 deletions(-)
diff --git a/ex1_sram/Makefile b/ex1_sram/Makefile
@@ -1,3 +1,4 @@
+CC = arm-none-eabi-gcc
AS = arm-none-eabi-as
LD = arm-none-eabi-ld
OBJCOPY = arm-none-eabi-objcopy
@@ -18,8 +19,11 @@ clean:
.s.o:
$(AS) $(ASFLAGS) -o $@ $<
-led.elf: boot2.o main.o memmap.ld
- $(LD) $(LDFLAGS) -o $@ -T memmap.ld boot2.o main.o
+.c.o:
+ $(CC) $(CFLAGS) -o $@ $<
+
+led.elf: boot2.o main.o start.o memmap.ld
+ $(LD) $(LDFLAGS) -o $@ -T memmap.ld boot2.o main.o start.o
led.bin: led.elf
$(OBJCOPY) -O binary led.elf $@
diff --git a/ex1_sram/main.c b/ex1_sram/main.c
@@ -0,0 +1,7 @@
+void led(void);
+
+void
+main(void)
+{
+ led();
+}
diff --git a/ex1_sram/main.s b/ex1_sram/main.s
@@ -1,62 +0,0 @@
-.cpu cortex-m0plus
-.thumb
-
- .section .vectors
- .global vectors
-vectors:
- .word 0x20040000 // initial SP
- .word (reset+1) // entry point
-
- .section .text
-reset:
- // unreset gpio
- mov r0, #1
- lsl r0, r0, #5 // io_bank0
- ldr r3, resets_base
- ldr r1, atomic_clr
- str r0, [r3, r1] // RESETS: RESET
-
-reset_chk:
- ldr r1, [r3, #0x8] // RESETS: RESET_DONE
- tst r0, r1
- beq reset_chk
-
- // set gpio functions
- ldr r3, io_bank0_base
- mov r0, #5 // sio
- mov r1, #0xcc
- str r0, [r3, r1] // IO_BANK0: GPIO25_CTRL
-
- // enable gpio output
- ldr r3, sio_base
- mov r0, #1
- lsl r0, r0, #25 // gpio25
- str r0, [r3, #0x24] // SIO: GPIO_OE
-
- // blink led on gpio25
- ldr r4, sio_base
- mov r5, r0
-loop:
- str r5, [r4, #0x1c] // SIO_GPIO_OUT_XOR
- bl delay
- b loop
-
-delay:
- mov r0, #1
- lsl r0, r0, #20
-delay_loop:
- sub r0, r0, #1
- bne delay_loop
- bx lr
-
-// literals
- .align 2
-atomic_clr:
- .word 0x00003000
-resets_base:
- .word 0x4000c000
-io_bank0_base:
- .word 0x40014000
-sio_base:
- .word 0xd0000000
-
diff --git a/ex1_sram/start.s b/ex1_sram/start.s
@@ -0,0 +1,66 @@
+.cpu cortex-m0plus
+.thumb
+
+ .section .vectors
+ .global vectors
+vectors:
+ .word 0x20040000 // initial SP
+ .word (reset+1) // entry point
+
+ .section .text
+reset:
+ bl main
+
+ .global led
+led:
+ // unreset gpio
+ mov r0, #1
+ lsl r0, r0, #5 // io_bank0
+ ldr r3, resets_base
+ ldr r1, atomic_clr
+ str r0, [r3, r1] // RESETS: RESET
+
+reset_chk:
+ ldr r1, [r3, #0x8] // RESETS: RESET_DONE
+ tst r0, r1
+ beq reset_chk
+
+ // set gpio functions
+ ldr r3, io_bank0_base
+ mov r0, #5 // sio
+ mov r1, #0xcc
+ str r0, [r3, r1] // IO_BANK0: GPIO25_CTRL
+
+ // enable gpio output
+ ldr r3, sio_base
+ mov r0, #1
+ lsl r0, r0, #25 // gpio25
+ str r0, [r3, #0x24] // SIO: GPIO_OE
+
+ // blink led on gpio25
+ ldr r4, sio_base
+ mov r5, r0
+loop:
+ str r5, [r4, #0x1c] // SIO_GPIO_OUT_XOR
+ bl delay
+ b loop
+
+delay:
+ mov r0, #1
+ lsl r0, r0, #20
+delay_loop:
+ sub r0, r0, #1
+ bne delay_loop
+ bx lr
+
+// literals
+ .align 2
+atomic_clr:
+ .word 0x00003000
+resets_base:
+ .word 0x4000c000
+io_bank0_base:
+ .word 0x40014000
+sio_base:
+ .word 0xd0000000
+
