software: add minimal baremetal demo app.
Used to demonstrates how to easily create baremetal apps, boot to it with LiteX and
also ease litex_term testing.
To build it: export BUILD_DIR=xxyy/litex/litex/boards/targets/build/arty && make
To load it: lxterm /dev/ttyUSB1 --kernel=demo.bin
--============== Boot ==================--
Booting from serial...
Press Q or ESC to abort boot completely.
sL5DdSMmkekro
[LXTERM] Received firmware download request from the device.
[LXTERM] Uploading demo.bin to 0x40000000 (9264 bytes)...
[LXTERM] Upload complete (9.8KB/s).
[LXTERM] Booting the device.
[LXTERM] Done.
Executing booted program at 0x40000000
--============= Liftoff! ===============--
LiteX minimal demo app built Dec 10 2020 17:13:02
Available commands:
help - Show this command
reboot - Reboot CPU
led - Led demo
donut - Spinning Donut demo
litex-demo-app> led
Led demo...
Counter mode...
Shift mode...
Dance mode...
litex-demo-app> donut
Donut demo...
$$$$$@@@@@
$##########$$$$$$$$
###*!!!!!!!!!***##$$$$$$
***!!====;;;;===!!**###$$$$#
**!===;;;:::::;:===!!**####$##
!*!!==;;:~-,,.,-~::;;=!!**#######!
!!!!=;:~-,.......-~::==!!***#####*
!!!!==;~~-.........,-:;==!!***###**!
!**!!=;:~-... ..-:;=!!!********!
;!*#####*!!;. ~:;==!!!******!!=
:!*###$$$$#*! :;==!!!!!****!!!=;
~=!*#$$$@@@$$##!!!!!!!!!!!!****!!!!=;
;=!*#$$$@@@@$$#*******!*!!*!!!!!==;~
-;!*###$$$$$$$###******!!!!!!!===;~
-;!!*####$#####******!!!!!!==;;:-
,:=!!!!**#**#***!!!!!!!====;:~,
-:==!!!*!!*!!!!!!!===;;;:~-
.~:;;========;=;;:::~-,
.--~~::::~:~~--,.
litex-demo-app>
This commit is contained in:
Florent Kermarrec
parent
ef6fd57613
commit
88bd754dd6
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@ -0,0 +1,42 @@
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BUILD_DIR?=../build/
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include $(BUILD_DIR)/software/include/generated/variables.mak
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include $(SOC_DIRECTORY)/software/common.mak
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OBJECTS=isr.o donut.o main.o
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all: demo.bin
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# pull in dependency info for *existing* .o files
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-include $(OBJECTS:.o=.d)
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%.bin: %.elf
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$(OBJCOPY) -O binary $< $@
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chmod -x $@
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demo.elf: $(OBJECTS)
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$(LD) $(LDFLAGS) \
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-T linker.ld \
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-N -o $@ \
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$(BUILD_DIR)/software/libbase/crt0.o \
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$(OBJECTS) \
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-L$(BUILD_DIR)/software/libbase \
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-L$(BUILD_DIR)/software/libcompiler_rt \
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-lbase-nofloat -lcompiler_rt
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chmod -x $@
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main.o: main.c
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$(compile)
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donut.o: CFLAGS += -w
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%.o: %.c
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$(compile)
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%.o: %.S
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$(assemble)
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clean:
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$(RM) $(OBJECTS) $(OBJECTS:.o=.d) demo.elf demo.bin .*~ *~
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.PHONY: all main.o clean load
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@ -0,0 +1,67 @@
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// The donut code with fixed-point arithmetic; no sines, cosines, square roots, or anything.
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// a1k0n 2020
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// Code from: https://gist.github.com/a1k0n/80f48aa8911fffd805316b8ba8f48e83
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// For more info:
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// - https://www.a1k0n.net/2011/07/20/donut-math.html
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// - https://www.youtube.com/watch?v=DEqXNfs_HhY
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <console.h>
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#define R(mul,shift,x,y) \
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_=x; \
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x -= mul*y>>shift; \
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y += mul*_>>shift; \
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_ = 3145728-x*x-y*y>>11; \
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x = x*_>>10; \
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y = y*_>>10;
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signed char b[1760], z[1760];
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void donut(void) {
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int sA=1024,cA=0,sB=1024,cB=0,_;
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for (;;) {
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memset(b, 32, 1760); // text buffer
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memset(z, 127, 1760); // z buffer
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int sj=0, cj=1024;
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for (int j = 0; j < 90; j++) {
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int si = 0, ci = 1024; // sine and cosine of angle i
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for (int i = 0; i < 324; i++) {
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int R1 = 1, R2 = 2048, K2 = 5120*1024;
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int x0 = R1*cj + R2,
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x1 = ci*x0 >> 10,
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x2 = cA*sj >> 10,
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x3 = si*x0 >> 10,
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x4 = R1*x2 - (sA*x3 >> 10),
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x5 = sA*sj >> 10,
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x6 = K2 + R1*1024*x5 + cA*x3,
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x7 = cj*si >> 10,
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x = 40 + 30*(cB*x1 - sB*x4)/x6,
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y = 12 + 15*(cB*x4 + sB*x1)/x6,
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N = (-cA*x7 - cB*((-sA*x7>>10) + x2) - ci*(cj*sB >> 10) >> 10) - x5 >> 7;
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int o = x + 80 * y;
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signed char zz = (x6-K2)>>15;
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if (22 > y && y > 0 && x > 0 && 80 > x && zz < z[o]) {
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z[o] = zz;
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b[o] = ".,-~:;=!*#$@"[N > 0 ? N : 0];
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}
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R(5, 8, ci, si) // rotate i
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}
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R(9, 7, cj, sj) // rotate j
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}
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for (int k = 0; 1761 > k; k++)
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putchar(k % 80 ? b[k] : 10);
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R(5, 7, cA, sA);
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R(5, 8, cB, sB);
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if (readchar_nonblock()) {
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readchar();
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break;
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}
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putsnonl("\x1b[23A");
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}
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}
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@ -0,0 +1,29 @@
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// This file is Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
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// License: BSD
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#include <generated/csr.h>
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#include <generated/soc.h>
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#include <irq.h>
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#include <uart.h>
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void isr(void);
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#ifdef CONFIG_CPU_HAS_INTERRUPT
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void isr(void)
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{
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__attribute__((unused)) unsigned int irqs;
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irqs = irq_pending() & irq_getmask();
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#ifndef UART_POLLING
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if(irqs & (1 << UART_INTERRUPT))
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uart_isr();
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#endif
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}
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#else
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void isr(void){};
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#endif
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@ -0,0 +1,56 @@
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INCLUDE generated/output_format.ld
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ENTRY(_start)
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__DYNAMIC = 0;
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INCLUDE generated/regions.ld
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SECTIONS
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{
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.text :
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{
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_ftext = .;
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*(.text .stub .text.* .gnu.linkonce.t.*)
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_etext = .;
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} > main_ram
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.rodata :
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{
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. = ALIGN(4);
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_frodata = .;
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*(.rodata .rodata.* .gnu.linkonce.r.*)
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*(.rodata1)
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_erodata = .;
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} > main_ram
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.data :
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{
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. = ALIGN(4);
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_fdata = .;
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*(.data .data.* .gnu.linkonce.d.*)
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*(.data1)
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_gp = ALIGN(16);
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*(.sdata .sdata.* .gnu.linkonce.s.*)
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_edata = .;
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} > main_ram
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.bss :
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{
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. = ALIGN(4);
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_fbss = .;
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*(.dynsbss)
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*(.sbss .sbss.* .gnu.linkonce.sb.*)
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*(.scommon)
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*(.dynbss)
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*(.bss .bss.* .gnu.linkonce.b.*)
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*(COMMON)
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. = ALIGN(4);
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_ebss = .;
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_end = .;
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} > sram
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}
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PROVIDE(_fstack = ORIGIN(sram) + LENGTH(sram) - 4);
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PROVIDE(_fdata_rom = LOADADDR(.data));
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PROVIDE(_edata_rom = LOADADDR(.data) + SIZEOF(.data));
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@ -0,0 +1,176 @@
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// This file is Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
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// License: BSD
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <irq.h>
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#include <uart.h>
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#include <console.h>
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#include <generated/csr.h>
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/*-----------------------------------------------------------------------*/
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/* Uart */
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/*-----------------------------------------------------------------------*/
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static char *readstr(void)
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{
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char c[2];
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static char s[64];
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static int ptr = 0;
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if(readchar_nonblock()) {
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c[0] = readchar();
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c[1] = 0;
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switch(c[0]) {
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case 0x7f:
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case 0x08:
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if(ptr > 0) {
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ptr--;
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putsnonl("\x08 \x08");
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}
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break;
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case 0x07:
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break;
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case '\r':
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case '\n':
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s[ptr] = 0x00;
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putsnonl("\n");
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ptr = 0;
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return s;
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default:
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if(ptr >= (sizeof(s) - 1))
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break;
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putsnonl(c);
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s[ptr] = c[0];
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ptr++;
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break;
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}
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}
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return NULL;
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}
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static char *get_token(char **str)
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{
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char *c, *d;
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c = (char *)strchr(*str, ' ');
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if(c == NULL) {
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d = *str;
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*str = *str+strlen(*str);
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return d;
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}
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*c = 0;
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d = *str;
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*str = c+1;
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return d;
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}
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static void prompt(void)
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{
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printf("\e[92;1mlitex-demo-app\e[0m> ");
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}
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/*-----------------------------------------------------------------------*/
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/* Help */
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/*-----------------------------------------------------------------------*/
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static void help(void)
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{
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puts("\nLiteX minimal demo app built "__DATE__" "__TIME__"\n");
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puts("Available commands:");
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puts("help - Show this command");
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puts("reboot - Reboot CPU");
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puts("led - Led demo");
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puts("donut - Spinning Donut demo");
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}
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/*-----------------------------------------------------------------------*/
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/* Commands */
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/*-----------------------------------------------------------------------*/
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static void reboot_cmd(void)
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{
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ctrl_reset_write(1);
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}
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static void led_cmd(void)
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{
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int i;
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printf("Led demo...\n");
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printf("Counter mode...\n");
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for(i=0; i<32; i++) {
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leds_out_write(i);
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busy_wait(100);
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}
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printf("Shift mode...\n");
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for(i=0; i<4; i++) {
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leds_out_write(1<<i);
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busy_wait(200);
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}
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for(i=0; i<4; i++) {
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leds_out_write(1<<(3-i));
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busy_wait(200);
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}
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printf("Dance mode...\n");
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for(i=0; i<4; i++) {
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leds_out_write(0x55);
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busy_wait(200);
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leds_out_write(0xaa);
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busy_wait(200);
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}
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}
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extern void donut(void);
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static void donut_cmd(void)
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{
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printf("Donut demo...\n");
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donut();
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}
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/*-----------------------------------------------------------------------*/
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/* Console service / Main */
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/*-----------------------------------------------------------------------*/
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static void console_service(void)
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{
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char *str;
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char *token;
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str = readstr();
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if(str == NULL) return;
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token = get_token(&str);
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if(strcmp(token, "help") == 0)
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help();
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else if(strcmp(token, "reboot") == 0)
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reboot_cmd();
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else if(strcmp(token, "led") == 0)
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led_cmd();
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else if(strcmp(token, "donut") == 0)
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donut_cmd();
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prompt();
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}
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int main(void)
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{
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#ifdef CONFIG_CPU_HAS_INTERRUPT
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irq_setmask(0);
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irq_setie(1);
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#endif
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uart_init();
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help();
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prompt();
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while(1) {
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console_service();
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}
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return 0;
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}
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