c_soft/riscv/main.c

#include "stdint.h"
#include "stdio.h"
#include "stdarg.h"

#define PRINT_BASE_ADDR *(uint8_t *)0x40000000

int my_putc(int c) {
  PRINT_BASE_ADDR = c;
  return c;
}


int my_puts(char *s,int len) {
  for (int i = 0;i < len;i++) {
    my_putc(s[i]);
  }
  return 0;
}

static char g_print_buff[1024];
int my_printf(const char* fmt, ...) {
  int len = 0;
  va_list args;
  va_start(args, fmt);
  len = vsnprintf(g_print_buff, 1024, fmt, args);
  va_end(args);
  my_puts(g_print_buff, len);
  return len;
}




int add(int a, int b) {
  return a+b;
}


char g_string[] = "string from ram";


int main()
{
  int a=1;
  int b=2;
  int c = add(a, b);
  my_printf("Hello World! %s\n", "Andy");
  my_printf("add(%d, %d)=%d\n", a, b, c);
  a = 67;b = 78;
  my_printf("mul(%d, %d)=%d\n", a, b, a * b);
  my_printf("ram_val test: %s\n", g_string);
  return 0;
}