commit 74bf05d533a89fee840998a101cef415e180ffa1
parent 2abd2bbbc4ddb143e60f6eea043a7b9be4c290a3
Author: Matsuda Kenji <info@mtkn.jp>
Date: Sat, 2 Mar 2024 08:23:39 +0900
merge
Diffstat:
10 files changed, 206 insertions(+), 17 deletions(-)
diff --git a/ex1_sram/Makefile b/ex1_sram/Makefile
@@ -0,0 +1,40 @@
+CC = arm-none-eabi-gcc
+AS = arm-none-eabi-as
+LD = arm-none-eabi-ld
+OBJCOPY = arm-none-eabi-objcopy
+BINCRC = ../tools/bincrc
+BIN2UF2 = ../tools/bin2uf2
+
+MCPU = -mcpu=cortex-m0plus
+ASFLAGS = $(MCPU)
+CFLAGS = $(MCPU) -ffreestanding -nostartfiles -O0 -fpic -mthumb -c
+LDFLAGS = --no-relax -nostdlib
+
+all: tools led.uf2
+
+clean:
+ rm -f *.o *.elf *.uf2 *.bin
+ cd ../tools && make clean
+
+.s.o:
+ $(AS) $(ASFLAGS) -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 $@
+
+led.uf2: led.bin
+ $(BINCRC) led.bin led_crc.bin
+ $(BIN2UF2) led_crc.bin $@
+
+flash: all
+ mount /dev/disk/by-label/RPI-RP2 /mnt
+ cp led.uf2 /mnt
+
+tools:
+ cd ../tools && make
diff --git a/ex1_sram/boot2.s b/ex1_sram/boot2.s
@@ -0,0 +1,46 @@
+.cpu cortex-m0plus
+.thumb
+
+ .section .boot2
+boot2:
+ // setup xip
+ ldr r3, rom_base
+ ldrh r0, [r3, #0x14] // rom_func_table
+ ldr r1, =('C' | 'X' << 8) // _flash_enter_cmd_xip()
+ ldrh r2, [r3, #0x18] // rom_table_lookup
+ blx r2
+ blx r0
+
+ // load main program to sram
+ ldr r0, =text_start
+ ldr r1, =text_size
+ mov r2, #0
+ ldr r3, sram_base
+copy:
+ cmp r1, r2
+ beq end
+ ldr r4, [r0, r2]
+ str r4, [r3, r2]
+ add r2, #4
+ b copy
+end:
+
+ // setup vector table
+ ldr r0, =vectors
+ ldr r1, m0plus_vtor
+ str r0, [r1, #0] // M0PLUS: VTOR
+ ldr r1, [r0, #4] // entry point
+ ldr r0, [r0, #0] // stack pointer
+ mov sp, r0
+ bx r1
+
+ .align 2
+rom_base:
+ .word 0x00000000
+sram_base:
+ .word 0x20000000
+m0plus_vtor:
+ .word 0xe0000000 + 0xed08
+literals:
+ .ltorg
+
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/memmap.ld b/ex1_sram/memmap.ld
@@ -0,0 +1,26 @@
+MEMORY
+{
+ FLASH(rx) : ORIGIN = 0x10000000, LENGTH = 2048k
+ SRAM(rwx) : ORIGIN = 0x20000000, LENGTH = 264k
+}
+
+SECTIONS
+{
+ .boot2 : {
+ *(.boot2)
+ . = 0x100;
+ } > FLASH
+
+ .vectors : {
+ *(.vectors)
+ . += SIZEOF(.vectors);
+ . = ALIGN(2);
+ text_start = .;
+ } > FLASH
+
+ .text : {
+ *(.text)
+ } > SRAM AT > FLASH
+ text_size = SIZEOF(.text);
+}
+
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
+
diff --git a/ex3/Makefile b/ex3/Makefile
@@ -1,6 +1,6 @@
+CC = arm-none-eabi-gcc
AS = arm-none-eabi-as
LD = arm-none-eabi-ld
-CC = arm-none-eabi-gcc
OBJCOPY = arm-none-eabi-objcopy
BINCRC = ../tools/bincrc
BIN2UF2 = ../tools/bin2uf2
diff --git a/ex3/boot2.s b/ex3/boot2.s
@@ -11,24 +11,23 @@ boot2:
blx r2
blx r0
- // copy main code to SRAM
- ldr r0, =start_text
+ // load main program to sram
+ ldr r0, =text_start
ldr r1, =text_size
mov r2, #0
- ldr r3, rom_base
- ldr r4, sram_base
+ ldr r3, sram_base
copy:
- cmp r2, r1
+ cmp r1, r2
beq end
- ldr r5, [r0, r2]
- str r5, [r4, r2]
+ ldr r4, [r0, r2]
+ str r4, [r3, r2]
add r2, #4
b copy
end:
- // set vector table
+ // setup vector table
ldr r0, =vectors
- ldr r1, m0plus_vtor
+ ldr r1, m0plus_vtor
str r0, [r1, #0] // M0PLUS: VTOR
ldr r1, [r0, #4] // entry point
ldr r0, [r0, #0] // stack pointer
diff --git a/ex3/main.c b/ex3/main.c
@@ -6,7 +6,6 @@ void set_alarm(unsigned int);
int
main(void) {
init();
- puts("C file");
return 0;
}
@@ -15,11 +14,9 @@ isr_svcall(void) {
puts("svcall");
}
-int count = 0;
-
void
isr_alarm(void) {
- printh(count++);
- puts("alarm fired");
+ char *msg = "hello";
+ puts(msg);
set_alarm(1000 * 1000);
}
diff --git a/ex3/memmap.ld b/ex3/memmap.ld
@@ -12,11 +12,18 @@ SECTIONS
} > FLASH
.vectors : {
*(.vectors)
+ . += SIZEOF(.vectors);
+ . = ALIGN(2);
+ text_start = .;
} > FLASH
- start_text = .;
.text : {
*(.text)
} > SRAM AT > FLASH
text_size = SIZEOF(.text);
+ .rodata : {
+ *(.rodata)
+ } > SRAM AT > FLASH
+ text_size += SIZEOF(.rodata);
+ text_size = 0x300;
}
diff --git a/ex3/start.s b/ex3/start.s
@@ -1,6 +1,7 @@
.cpu cortex-m0plus
.thumb
+ .align 8
.section .vectors
.global vectors
vectors:
@@ -305,7 +306,7 @@ bled:
str r5, [r4, #0x18] // SIO: GPIO_OUT_XOR
bl delay
pop {r0, r1, r2, r3, r4, r5, pc}
-
+
delay:
push {r0}
mov r0, #1
