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Fibonacci sample

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This commit is contained in:
Toby Jaffey 2025-12-07 01:00:52 +00:00
parent f235265e3f
commit 30cf60561f
2 changed files with 75 additions and 0 deletions
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27
apps/fib/Makefile Normal file
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PROJECT:=fib
DOCKER_IMAGE=riscv-dev
DOCKER_CMD:=docker run --rm -v ${PWD}../../../:/data -w /data/apps/${PROJECT} ${DOCKER_IMAGE}
PREFIX:=${DOCKER_CMD} riscv64-unknown-elf-
CFLAGS+=-I../../common
CFLAGS+=-fno-stack-protector
CFLAGS+=-static-libgcc -fdata-sections -ffunction-sections
CFLAGS+=-g -Os -march=rv32ima_zicsr -mabi=ilp32 -static
LDFLAGS:= -T ../linker.ld -nostdlib -Wl,--gc-sections
LIBS:= #-lgcc # needed for softfp
SRCS=${PROJECT}.c ../crt0.s
all:
${PREFIX}gcc -o ${PROJECT}.elf ${CFLAGS} ${LDFLAGS} ${SRCS} ${LIBS}
$(PREFIX)objcopy ${PROJECT}.elf -O binary ${PROJECT}.bin
disasm: all
$(PREFIX)objdump -S -d -f ${PROJECT}.elf
test: all
../../host/host ${PWD}/${PROJECT}.bin
clean:
rm -f ${PROJECT}.o ${PROJECT}.elf ${PROJECT}.bin

48
apps/fib/fib.c Normal file
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#define USE_MAIN
#include "uvm32_target.h"
// print n terms of fibonacci series
void printFib(int n) {
int prev1 = 1;
int prev2 = 0;
for (int i = 1; i <= n; i++) {
if (i > 2) {
int curr = prev1 + prev2;
prev2 = prev1;
prev1 = curr;
printd(curr);
} else if (i == 1) {
printd(prev2);
} else if (i == 2) {
printd(prev1);
}
}
}
// print n terms of fibonacci series, recursively
void fib_recursive(int n, int prev1, int prev2) {
if (n < 3) {
return;
}
int curr = prev1 + prev2;
printd(curr);
return fib_recursive(n - 1, prev2, curr);
}
void printFibRec(int n) {
printd(0);
printd(1);
fib_recursive(n, 0, 1);
}
void main(void) {
int n = 40;
println("fib() loop");
printFib(n);
println("fib() recursive");
printFibRec(n);
}