build hello fw with GCC Toolchain v2020.04.1 (set GPIO_IOF_EN). Remove obsolete function write_hex

hello/bsp/Debug/libwrap/misc/subdir.mk

@@ -1,27 +0,0 @@
-################################################################################
-# Automatically-generated file. Do not edit!
-################################################################################
-
-# Add inputs and outputs from these tool invocations to the build variables 
-C_SRCS += \
-../libwrap/misc/write_hex.c 
-
-O_SRCS += \
-../libwrap/misc/write_hex.o 
-
-OBJS += \
-./libwrap/misc/write_hex.o 
-
-C_DEPS += \
-./libwrap/misc/write_hex.d 
-
-
-# Each subdirectory must supply rules for building sources it contributes
-libwrap/misc/%.o: ../libwrap/misc/%.c
-	@echo 'Building file: $<'
-	@echo 'Invoking: Cross GCC Compiler'
-	riscv32-unknown-elf-gcc -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@)" -o "$@" "$<"
-	@echo 'Finished building: $<'
-	@echo ' '
-
-

hello/bsp/env/hifive1.h

@@ -76,6 +76,4 @@
 
 #define RTC_FREQ 32768
 
-void write_hex(int fd, uint32_t hex);
-
 #endif /* _SIFIVE_HIFIVE1_H */

hello/bsp/libwrap/libwrap.mk

@@ -25,8 +25,7 @@ LIBWRAP_SRCS := \
 	sys/isatty.c \
 	sys/times.c \
 	sys/sbrk.c \
-	sys/_exit.c \
+	sys/_exit.c 
-	misc/write_hex.c
 
 LIBWRAP_SRCS := $(foreach f,$(LIBWRAP_SRCS),$(LIBWRAP_DIR)/$(f))
 LIBWRAP_OBJS := $(LIBWRAP_SRCS:.c=.o)

hello/bsp/libwrap/misc/write_hex.c

@@ -1,19 +0,0 @@
-/* See LICENSE of license details. */
-
-#include <stdint.h>
-#include <unistd.h>
-#include "platform.h"
-
-void write_hex(int fd, uint32_t hex)
-{
-  uint8_t ii;
-  uint8_t jj;
-  char towrite;
-  write(fd , "0x", 2);
-  for (ii = 8 ; ii > 0; ii--) {
-    jj = ii - 1;
-    uint8_t digit = ((hex & (0xF << (jj*4))) >> (jj*4));
-    towrite = digit < 0xA ? ('0' + digit) : ('A' +  (digit - 0xA));
-    write(fd, &towrite, 1);
-  }
-}

hello/bsp/libwrap/sys/_exit.c

@@ -10,7 +10,6 @@ void __wrap__exit(int code)
 //*leds = (~(code));
 
   write(STDERR_FILENO, message, sizeof(message) - 1);
-  write_hex(STDERR_FILENO, code);
   write(STDERR_FILENO, "\n", 1);
 
   for (;;);

hello/hello.c

@@ -57,14 +57,17 @@ unsigned read_adc(unsigned index){
     return result&0x03ff;
 }
 
-
+//int read_csr(int csr_num) __attribute__((always_inline)) {
-extern void write_hex(int fd, uint32_t hex);
+//    int result;
+//    asm("csrr %0, %1" : "=r"(result) : "I"(csr_num));
+//    return result;
+//}
 
 int main()
 {
-    write_hex(1, 0x55aa);
+	GPIO_REG(GPIO_IOF_EN) |= 0x30000;
-	volatile int result = factorial (10);
+	int result = factorial (10);
-	printf("Factorial is %d\n", result);
+	printf("Factorial of 10 is %d\n", result);
 	for(unsigned i=0; i<8; ++i)
 	    printf("ADC%u value read is %u\n", i, read_adc(i));
 	printf("End of execution");