diff options
Diffstat (limited to 'assembler')
| -rw-r--r-- | assembler/Makefile | 45 | ||||
| -rw-r--r-- | assembler/assemble.s | 2 | ||||
| -rw-r--r-- | assembler/main.s | 33 | ||||
| -rw-r--r-- | assembler/pico_bin.ld (renamed from assembler/pico_ram_only.ld) | 4 | ||||
| -rw-r--r-- | assembler/slowcat.c | 11 | ||||
| -rw-r--r-- | assembler/uart.s | 86 |
6 files changed, 123 insertions, 58 deletions
diff --git a/assembler/Makefile b/assembler/Makefile index 0225069..45988ba 100644 --- a/assembler/Makefile +++ b/assembler/Makefile @@ -1,29 +1,38 @@ -PICO = /dev/disk/by-label/RPI-RP2 +DEVICE = /dev/ttyUSB0 -assemble.uf2: assemble.elf - ../elf/elf2uf2 assemble.elf assemble.uf2 +.PHONY: build +build: assemble.he + +assemble.he: assemble.bin + od -An -tx2 -v assemble.bin | sed "s/^ //" | tr " " "\n" | tr [:lower:] [:upper:] | sed "s/^/0x/" > assemble.he + +assemble.bin: assemble.elf + arm-none-eabi-objcopy -O binary assemble.elf assemble.bin objects = main.o uart.o assemble.o register.o octal.o opcode.o -assemble.elf: $(objects) - arm-none-eabi-ld -T pico_ram_only.ld -o assemble.elf $(objects) ../setup/setup.so +assemble.elf: pico_bin.ld $(objects) + arm-none-eabi-ld -T pico_bin.ld -o assemble.elf $(objects) $(objects): %.o: %.s arm-none-eabi-as -o $@ $< .PHONY: clean clean: - rm assemble.elf assemble.uf2 *.o - -.PHONY: flash -flash: $(PICO) assemble.uf2 - cat assemble.uf2 > $(PICO) - -.PHONY: check -check: $(PICO) - @echo Ready to flash - -$(PICO): - @echo "RPI-RP2 bootloader drive not found" - @echo Connect the pico with USB cable while holding bootsel button + rm assemble.elf assemble.bin assemble.he *.o slowcat + +.PHONY: dump +dump: assemble.bin + @od -Ax -tx2 -v assemble.bin + +.PHONY: serial +serial: $(DEVICE) assemble.he slowcat + cat assemble.he | tr "\n" "\r" | ./slowcat | picocom -b 115200 -q $(DEVICE) + @echo + echo -n "G" | picocom -b 115200 -q $(DEVICE) + @echo + +$(DEVICE): + @echo Serial device not found + @echo Connect USB cable from USB-UART bridge @false diff --git a/assembler/assemble.s b/assembler/assemble.s index 9f5c022..704b7cf 100644 --- a/assembler/assemble.s +++ b/assembler/assemble.s @@ -9,7 +9,6 @@ // - make subroutine addresses explicit // - test each instruction // - decide on additional push or pops -// - add GO to get_char assemble: PUSH {LR} LDR R0, =uart_send @@ -72,4 +71,5 @@ done_stuff: MOV R0, R8 // copy the end_char into R0 BLX R9 // echo the space (or carriage return) here: LSRS R7, 0x8 // get next parse instruction BNE main_loop // if it's nonzero there are more things to parse + MOVS R0, 0 POP {PC} diff --git a/assembler/main.s b/assembler/main.s index 1795823..a9fd109 100644 --- a/assembler/main.s +++ b/assembler/main.s @@ -5,22 +5,31 @@ .type main, %function .global main -main: - bl start_xosc - bl setup_clocks - bl setup_gpio - bl setup_uart - b assembler - -assembler: LDR R0, =0x20001000 // SRAM_BASE - MOV R11, R0 +main: LDR R0, =0x20000000 // SRAM_BASE +0: MOV R11, R0 ADDS R1, R0, 1 // JUMP ADDRESS MOV R12, R1 1: BL PROMPT // SHOW PROMPT BL assemble - B 2f // TODO condition + CMP R0, 1 // SET NEW ADDRESS + BNE 2f + MOVS R0, '\r // SEND CR + BL uart_send + MOV R1, R11 // GET ADDRESS + LSRS R1, 16 // SHIFT OUT LOWER HALFWORD + MOVS R0, R1 // SAVE IN R0 + LSLS R1, 16 // SHIFT BACK + MOV R11, R1 // SAVE ALTERRED ADDRESS + MOVS R1, 4 // SEND HEX WITH WIDTH 4 + BL send_hex + BL get_hex // GET HEX INPUT FOR OFFSET + MOV R0, R11 // ADD OFFSET TO ADDRESS + ADDS R0, R4 + B 0b +2: CMP R0, 2 // JUMP TO NEW CODE + BNE 3f BX R12 -2: MOV R7, R11 // STORE INSTRUCTION WORD +3: MOV R7, R11 // STORE INSTRUCTION WORD STRH R6, [R7] MOVS R0, '\r // NEW LINE BL uart_send @@ -35,11 +44,13 @@ assembler: LDR R0, =0x20001000 // SRAM_BASE PROMPT: PUSH {LR} MOV R0, R11 // CURRENT ADDRESS + MOVS R1, 8 BL send_hex MOVS R0, ' // SPACE BL uart_send MOV R1, R11 // CURRENT CONTENTS LDRH R0, [R1] + MOVS R1, 4 BL send_hex MOVS R0, ' // SPACE BL uart_send diff --git a/assembler/pico_ram_only.ld b/assembler/pico_bin.ld index eb2450e..3059501 100644 --- a/assembler/pico_ram_only.ld +++ b/assembler/pico_bin.ld @@ -2,12 +2,12 @@ ENTRY(main) MEMORY { FLASH(rx) : ORIGIN = 0x10000000, LENGTH = 2M - SRAM(rwx) : ORIGIN = 0x20000000, LENGTH = 264K + SRAM(rwx) : ORIGIN = 0x20001000, LENGTH = 260K } SECTIONS { .text : { - *(.text) + *(.text); . = ALIGN(4); } > SRAM } diff --git a/assembler/slowcat.c b/assembler/slowcat.c new file mode 100644 index 0000000..99493ae --- /dev/null +++ b/assembler/slowcat.c @@ -0,0 +1,11 @@ +#include <unistd.h> +#include <stdint.h> + +int main() { + uint8_t byte; + while (read(STDIN_FILENO, &byte, 1)) { + write(STDOUT_FILENO, &byte, 1); + usleep(1000); + } + return 0; +} diff --git a/assembler/uart.s b/assembler/uart.s index e1f5e8b..5712268 100644 --- a/assembler/uart.s +++ b/assembler/uart.s @@ -10,11 +10,13 @@ .type uart_recv, %function .type get_char, %function .type send_hex, %function +.type get_hex, %function .global uart_send .global uart_recv .global get_char .global send_hex +.global get_hex uart_send: LDR R1, =UART0_BASE // 0x0000 0x4917 MOVS R3, 0b1 << 5 // 0x0002 0x2320 ; TX FIFO FULL @@ -33,30 +35,62 @@ uart_recv: LDR R1, =UART0_BASE // 0x000E 0x4914 get_char: PUSH {LR} // 0x001C 0xB500 BL uart_recv // 0x001E 0xF7FF // 0x0020 0xFFF6 - CMP R0, R8 // 0x0022 0x4540 + CMP R0, '< + BNE 1f + MOVS R0, 1 + B 2f +1: CMP R0, '> + BNE 3f + MOVS R0, 2 +2: POP {R1} + POP {R1} +3: CMP R0, R8 // 0x0022 0x4540 POP {PC} // 0x0024 0xBD00 -send_hex: PUSH {LR} // 0x0026 0xB500 - LSLS R4, R0, 16 // 0x0028 0x - MOVS R0, '0 // 0x002A 0x2030 - BL uart_send // 0x002C 0xF7FF - // 0x002E 0xFFE8 - MOVS R0, 'x // 0x0030 0x2078 - BL uart_send // 0x0032 0xF7FF - // 0x0034 0xFFE5 - MOVS R5, 4 // 0x0036 0x2504 ; FOUR NIBBLES TO PRINT -0: MOVS R0, 28 // 0x0038 0x201C ; ROTATE LEFT 4 - RORS R4, R0 // 0x003A 0x41C4 - MOVS R0, 0xF // 0x003C 0x200F ; LOWEST NIBBLE MASK - ANDS R0, R4 // 0x003E 0x4020 - CMP R0, 0x9 // 0x0040 0x0000 ; NUMBER OR LETTER? - BHI 1f // 0x0042 0xD801 - ADDS R0, '0 // 0x0044 0x3030 - B 2f // 0x0046 0xE000 -1: ADDS R0, ('A - 0xA) // 0x0048 0x3037 -2: BL uart_send // 0x004A 0xF7FF - // 0x004C 0xFFD9 - SUBS R5, 1 // 0x004E 0x3D01 - BNE 0b // 0x0050 0xD1F2 - POP {PC} // 0x0052 0xBD00 - // 0x0054 0x4000 ; UART0_BASE - // 0x0056 0x4003 +send_hex: PUSH {LR} // 000350 132400 B500 + MOVS R4, R0 // 000352 000004 0004 + MOVS R5, R1 // 000354 000015 000D + LSLS R1, 0x2 // 000356 000211 0049 + RORS R4, R1 // 000360 040714 41CC + MOVS R0, 0x30 // 000362 020060 2030 ASCII 0 + BL uart_send // 000364 043710 UARTTX + MOVS R0, 0x78 // 000366 020170 ASCII x + BL uart_send // 000370 043710 UARTTX +0: MOVS R0, 0x1C // 000372 020034 + RORS R4, R0 // 000374 040704 + MOVS R0, 0x0F // 000376 020017 + ANDS R0, R4 // 000400 040040 + CMP R0, 0x9 // 000402 024011 + BHI 1f // 000404 154001 + ADDS R0, 0x30 // 000406 030060 ASCII 0 + B 2f // 000410 160000 +1: ADDS R0, 0x37 // 000412 030067 ASCII A MINUS 10 +2: BL uart_send // 000414 043710 UARTTX + SUBS R5, 1 // 000416 036401 + BNE 0b // 000420 150763 + POP {PC} // 000422 136400 +get_hex: PUSH {LR} // 000224 132400 + MOVS R4, 0x0 // 000226 022000 + MOVS R5, 0x4 // 000230 022404 +10: BL uart_recv // 000232 043700 HEX LOOP, UARTRX + CMP R0, 0x30 // 000234 024060 ASCII 0 + BLO 10b // 000236 151774 + CMP R0, 0x39 // 000240 024071 ASCII 9 + BLS 20f // 000242 154406 + CMP R0, 0x41 // 000244 024101 ASCII A + BLO 10b // 000246 151770 + CMP R0, 0x46 // 000250 024106 ASCII F + BHI 10b // 000252 154366 + BL uart_send // 000254 043710 UARTTX + SUBS R0, 0x37 // 000256 034067 ASCII A MINUS 10 + B 30f // 000260 160001 +20: BL uart_send // 000262 043710 UARTTX + SUBS R0, 0x30 // 000264 034060 ASCII 0 +30: LSLS R4, 0x4 // 000266 000444 + ADDS R4, R0 // 000270 014044 + SUBS R5, 0x1 // 000272 036401 + BNE 10b // 000274 150755 +40: BL uart_recv // 000276 043700 UARTRX + CMP R0, '\r // 000300 024015 CARRIAGE RETURN + BNE 40b // 000302 150774 + BL uart_send // 000304 043710 UARTTX + POP {PC} // 000306 136400 |