Add big-endian railroad crossing sample and big-endian versions of libraries

6 files changed, 222 insertions, 0 deletions

diff --git a/c/rrxing-be/Makefile b/c/rrxing-be/Makefile
new file mode 100644
index 0000000..f52b08f
--- /dev/null
+++ b/c/rrxing-be/Makefile
@@ -0,0 +1,20 @@
+all: rrxing.hex
+
+rrxing.o: rrxing.c
+	clang -target riscv32be-none-elf -I../rvcontroller-libraries -march=rv32imacb_zicntr_zicond_zicsr_zifencei_zihintpause_zilsd_zclsd_zabha_zacas_zbkb_zbkx_zcb_zcmp_zcmt -ffreestanding -O3 -c -o rrxing.o rrxing.c
+
+rrxing.elf: ../rvcontroller-libraries/rvcontroller-init-be.o ../rvcontroller-libraries/rvcontroller-ecalls-be.o rrxing.o
+	clang -target riscv32be-none-elf -T rvcontroller.ld -nostdlib -nostartfiles -Xlinker --no-warn-rwx-segments -o rrxing.elf ../rvcontroller-libraries/rvcontroller-init-be.o rrxing.o ../rvcontroller-libraries/rvcontroller-ecalls-be.o
+
+dump: rrxing.elf
+	riscv32be-none-elf-objdump -d rrxing.elf
+
+rrxing.hex: rrxing.elf
+	riscv32be-none-elf-objcopy -O ihex rrxing.elf rrxing.hex
+
+load: rrxing.hex
+	bash -c "wl-copy < rrxing.hex"
+
+clean:
+	rm -f rrxing.bin rrxing.elf rrxing.o init.o
+
diff --git a/c/rrxing-be/rrxing.c b/c/rrxing-be/rrxing.c
new file mode 100644
index 0000000..e867e8a
--- /dev/null
+++ b/c/rrxing-be/rrxing.c
@@ -0,0 +1,86 @@
+#include <stdint.h>
+#include <stdbool.h>
+#include "rvcontroller-ecalls.h"
+
+bool streq(char *a, char *b) {
+	for (int i=0;a[i] != 0 || b[i] != 0;i++) {
+		if (a[i] != b[i]) {
+			return false;
+		}
+	}
+	return true;
+}
+
+void sleep(uint32_t delay) {
+	//This will start having problems after about 130 years
+	//of uptime, but that's probably acceptable
+	uint32_t endtime = rdtime() + delay;
+	while (rdtime() < endtime) {}
+	return;
+}
+
+bool checkdetector(void) {
+	char channelbuf[16];
+	char msgbuf[16];
+	while (digiline_bufferlevel() > 0) {
+		lightweight_mode(0);
+		digiline_receive(channelbuf,16,msgbuf,16);
+		if (streq(channelbuf,"detect")) {
+			return true;
+		}
+	}
+	lightweight_mode(1);
+	return false;
+}
+
+void main() {
+	printstr("Railroad Crossing\nfor RVController\nInitializing HW\n");
+	digiline_send("light","OFF");
+	digiline_send("bell","off");
+	digiline_send("gate","up");
+	digiline_clearbuffer();
+	while (true) {
+		printstr("Idle\n");
+		lightweight_mode(1);
+		printstr("Lightweight: On\n");
+		while (!checkdetector()) {}
+		printstr("Train detected\nLightweight: Off\n");
+		lightweight_mode(0);
+		digiline_send("light","YELLOW");
+		printstr("Light: Yellow\n");
+		sleep(2);
+		digiline_send("bell","on");
+		printstr("Bell: On\n");
+		sleep(2);
+		digiline_send("light","RED");
+		printstr("Light: Red\n");
+		sleep(3);
+		digiline_send("gate","down");
+		printstr("Gate: Down\n");
+		sleep(4);
+		digiline_send("bell","off");
+		printstr("Bell: Off\n");
+
+		digiline_clearbuffer();
+		for (uint8_t time = 15;time > 0;time--) {
+			printstr("Timeout in ");
+			printint(time);
+			printstr("s\n");
+			sleep(1);
+			bool train = checkdetector();
+			lightweight_mode(0); //checkdetector() turns this on
+			if (train) {
+				digiline_clearbuffer();
+				time = 25;
+				printstr("Time reset by train\n");
+			}
+		}
+		printstr("Timed out\n");
+
+		digiline_send("gate","up");
+		printstr("Gate: Up\n");
+		sleep(2);
+		digiline_send("light","OFF");
+		printstr("Light: Off\n");
+	}
+}
diff --git a/c/rrxing-be/rrxing.elf b/c/rrxing-be/rrxing.elf
new file mode 100755
index 0000000..3accaa0
--- /dev/null
+++ b/c/rrxing-be/rrxing.elf
diff --git a/c/rrxing-be/rrxing.hex b/c/rrxing-be/rrxing.hex
new file mode 100644
index 0000000..763551c
--- /dev/null
+++ b/c/rrxing-be/rrxing.hex
@@ -0,0 +1,71 @@
+:100000009302000273A00231370101006520A94864

+:100010007300000082801481988133E6E60009C6EF

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diff --git a/c/rrxing-be/rrxing.o b/c/rrxing-be/rrxing.o
new file mode 100644
index 0000000..02faef0
--- /dev/null
+++ b/c/rrxing-be/rrxing.o
diff --git a/c/rrxing-be/rvcontroller.ld b/c/rrxing-be/rvcontroller.ld
new file mode 100644
index 0000000..985892b
--- /dev/null
+++ b/c/rrxing-be/rvcontroller.ld
@@ -0,0 +1,45 @@
+/* Thanks https://github.com/darklife/darkriscv */
+  __heap_size    = 0x200;  /* required amount of heap */
+  __stack_size  = 0x800;  /* required amount of stack */
+  ENTRY(_start);
+  MEMORY
+  {
+    RAM (rwx) : ORIGIN = 0x00000000, LENGTH = 0x10000
+  }
+  SECTIONS
+  {
+    .text :
+    {
+      *(.text.startup)
+      *(.text)
+      *(.text)
+      *(.rodata*)
+    } > RAM
+    .data :
+    {
+      *(.sbss)
+      *(.data)
+      *(.bss)
+      *(.rela*)
+      *(COMMON)
+    } > RAM
+
+    .heap :
+    {
+      . = ALIGN(4);
+      PROVIDE ( end = . );
+      _sheap = .;
+      . = . + __heap_size;
+      . = ALIGN(4);
+      _eheap = .;
+    } >RAM
+
+    .stack :
+    {
+      . = ALIGN(4);
+      _estack = .;
+      . = . + __stack_size;
+      . = ALIGN(4);
+      _sstack = .;
+    } >RAM
+  }