diff options
Diffstat (limited to 'octedit')
| -rw-r--r-- | octedit/Makefile | 22 | ||||
| -rw-r--r-- | octedit/main.s | 18 | ||||
| -rw-r--r-- | octedit/octedit.s | 34 | ||||
| -rw-r--r-- | octedit/pico_persist.ld | 13 | ||||
| -rw-r--r-- | octedit/uart.s | 33 |
5 files changed, 120 insertions, 0 deletions
diff --git a/octedit/Makefile b/octedit/Makefile new file mode 100644 index 0000000..26601c8 --- /dev/null +++ b/octedit/Makefile @@ -0,0 +1,22 @@ +all: build + +build: octedit.uf2 + +octedit.uf2: octedit.elf + ../elf/elf2uf2 octedit.elf octedit.uf2 + +objects = uart.o main.o octedit.o + +octedit.elf: $(objects) + arm-none-eabi-ld -T pico_persist.ld -o octedit.elf $(objects) ../setup/setup.so + ./checksum_pico_elf.py octedit.elf + +$(objects): %.o: %.s + arm-none-eabi-as -o $@ $< + +clean: + rm octedit.elf octedit.uf2 *.o + +flash: octedit.uf2 + [ -h /dev/disk/by-label/RPI-RP2 ] || sleep 3s + cat octedit.uf2 > /dev/disk/by-label/RPI-RP2 diff --git a/octedit/main.s b/octedit/main.s new file mode 100644 index 0000000..6c471ec --- /dev/null +++ b/octedit/main.s @@ -0,0 +1,18 @@ +.syntax unified +.cpu cortex-m0plus +.thumb + +.section .entry, "ax" + +.type main, %function +.global main + +main: + bl start_xosc + bl setup_clocks + bl setup_gpio + bl setup_uart + b octedit + +.section .stage_2_crc +.word 0x00000000 diff --git a/octedit/octedit.s b/octedit/octedit.s new file mode 100644 index 0000000..9445fd8 --- /dev/null +++ b/octedit/octedit.s @@ -0,0 +1,34 @@ +.syntax unified +.cpu cortex-m0plus +.thumb + +.equ SRAM_BASE, 0x20000000 + +.type octedit, %function +.global octedit + +octedit: + ldr r6, =SRAM_BASE + adds r5, r6, 1 +10: + movs r4, 0 +20: + bl uart_recv + cmp r0, '\r + beq 30f + cmp r0, 'G + beq 40f + bl uart_send + subs r0, '0 + lsls r4, 3 + adds r4, r0 + b 20b +30: + bl uart_send + movs r0, '\n + bl uart_send + strh r4, [r6] + adds r6, 2 + b 10b +40: + bx r5 diff --git a/octedit/pico_persist.ld b/octedit/pico_persist.ld new file mode 100644 index 0000000..9c37aba --- /dev/null +++ b/octedit/pico_persist.ld @@ -0,0 +1,13 @@ +MEMORY { + FLASH(rx) : ORIGIN = 0x10000000, LENGTH = 2M + SRAM(rx) : ORIGIN = 0x20041f00, LENGTH = 256 +} + +SECTIONS { + .text : { + *(.entry); + *(.text); + . = 252; + *(.stage_2_crc); + } >SRAM AT>FLASH +} diff --git a/octedit/uart.s b/octedit/uart.s new file mode 100644 index 0000000..e79cbdc --- /dev/null +++ b/octedit/uart.s @@ -0,0 +1,33 @@ +.syntax unified +.cpu cortex-m0plus +.thumb + +.equ UART0_BASE, 0x40034000 +.equ UARTDR_OFST, 0x00 +.equ UARTFR_OFST, 0x18 + +.type uart_send, %function +.global uart_send + +uart_send: + ldr r1, =UART0_BASE + movs r3, 0b1 << 5 // TX FIFO full +1: + ldr r2, [r1, UARTFR_OFST] + tst r2, r3 + bne 1b + strb r0, [r1, UARTDR_OFST] + bx lr + +.type uart_recv, %function +.global uart_recv + +uart_recv: + ldr r1, =UART0_BASE + movs r3, 0b1 << 4 // RX FIFO empty +1: + ldr r2, [r1, UARTFR_OFST] + tst r2, r3 + bne 1b + ldrb r0, [r1, UARTDR_OFST] + bx lr |