Added soclet with gpio banks to top

sw/blinky/blinky.c

@@ -1,8 +1,10 @@
 #include <stdint.h>
 
 #define GPIO_BASE 0x40000000u
+#define VOUT_BASE 0x40000004u
 
 static volatile uint32_t * const gpio = (volatile uint32_t *)GPIO_BASE;
+static volatile uint32_t * const vout = (volatile uint32_t *)VOUT_BASE;
 
 static void delay(volatile uint32_t ticks){
     while (ticks--) {
@@ -15,8 +17,11 @@ int main(void)
     uint32_t v = 0;
 
     for (;;) {
-        *gpio = v;
-        v++;
-        delay(20000u);
+        for(int i=0; i<1000; i++){
+            *vout = v;
+            v++;
+            delay(5u);
+        }
+        *gpio ^= 0xffffffff;
     }
 }

sw/sweep/Makefile

@@ -0,0 +1,56 @@
+TOOLCHAIN_PREFIX ?= riscv64-elf-
+
+CC      := $(TOOLCHAIN_PREFIX)gcc
+OBJCOPY := $(TOOLCHAIN_PREFIX)objcopy
+OBJDUMP := $(TOOLCHAIN_PREFIX)objdump
+SIZE    := $(TOOLCHAIN_PREFIX)size
+
+TARGET  := sweep
+SRCS_C  := sweep.c
+SRCS_S  := start.s
+OBJS    := $(SRCS_C:.c=.o) $(SRCS_S:.s=.o)
+
+ARCH_FLAGS := -march=rv32i_zicsr -mabi=ilp32
+CFLAGS     := $(ARCH_FLAGS) -Os -ffreestanding -fno-builtin -Wall -Wextra
+ASFLAGS    := $(ARCH_FLAGS)
+LDFLAGS    := $(ARCH_FLAGS) -nostdlib -nostartfiles -Wl,-Bstatic,-Tlink.ld,--gc-sections,-Map,$(TARGET).map
+
+HEX_TO_COE := ../../scripts/hex_to_coe.py
+HEX_TO_MIF := ../../scripts/hex_to_mif.py
+
+.PHONY: all clean disasm size
+
+all: $(TARGET).elf $(TARGET).bin $(TARGET).hex $(TARGET).coe $(TARGET).mif $(TARGET).elf.asm
+
+$(TARGET).elf: $(OBJS) link.ld
+	$(CC) $(LDFLAGS) -o $@ $(OBJS)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+%.o: %.s
+	$(CC) $(ASFLAGS) -c -o $@ $<
+
+$(TARGET).bin: $(TARGET).elf
+	$(OBJCOPY) -O binary $< $@
+
+$(TARGET).hex: $(TARGET).bin
+	hexdump -v -e '1/1 "%02x\n"' $< > $@
+
+$(TARGET).coe: $(TARGET).hex
+	$(HEX_TO_COE) $< $@
+
+$(TARGET).mif: $(TARGET).hex
+	$(HEX_TO_MIF) $< $@
+
+$(TARGET).elf.asm: $(TARGET).elf
+	$(OBJDUMP) -d -S $< > $@
+
+disasm: $(TARGET).elf.asm
+
+size: $(TARGET).elf
+	$(SIZE) $<
+
+clean:
+	rm -f $(TARGET).elf $(TARGET).bin $(TARGET).hex $(TARGET).coe $(TARGET).mif \
+		$(TARGET).elf.asm $(TARGET).map $(OBJS)

sw/sweep/link.ld

@@ -0,0 +1,33 @@
+OUTPUT_ARCH("riscv")
+ENTRY(_start)
+
+MEMORY
+{
+  RAM (rwx) : ORIGIN = 0x00000000, LENGTH = 8K
+}
+
+SECTIONS
+{
+  .text :
+  {
+    KEEP(*(.text.init))
+    *(.text .text.*)
+    *(.rodata .rodata.*)
+  } > RAM
+
+  .data :
+  {
+    *(.data .data.*)
+  } > RAM
+
+  .bss (NOLOAD) :
+  {
+    __bss_start = .;
+    *(.bss .bss.*)
+    *(COMMON)
+    __bss_end = .;
+  } > RAM
+
+  . = ALIGN(4);
+  __stack_top = ORIGIN(RAM) + LENGTH(RAM);
+}

sw/sweep/start.s

@@ -0,0 +1,23 @@
+.section .text.init
+.globl _start
+.type _start, @function
+
+_start:
+    la sp, __stack_top
+
+    # Zero .bss
+    la t0, __bss_start
+    la t1, __bss_end
+1:
+    bgeu t0, t1, 2f
+    sw zero, 0(t0)
+    addi t0, t0, 4
+    j 1b
+
+2:
+    call main
+
+3:
+    j 3b
+
+.size _start, .-_start

sw/sweep/sweep.c

@@ -0,0 +1,14 @@
+#include <stdint.h>
+
+#define GPIO_BASE 0x40000000u
+
+static volatile uint32_t * const R_FREQ = (volatile uint32_t *)GPIO_BASE;
+
+void main(){
+    for(;;){
+        for(int i=1000; i<10000; i++){
+            *R_FREQ = i;
+            for(int j=0; j<100; j++) asm volatile("nop");
+        }
+    }
+}