diff --git a/firmware/applications/cbitset.h b/firmware/applications/cbitset.h
new file mode 100644
index 0000000..4e76b82
--- /dev/null
+++ b/firmware/applications/cbitset.h
@@ -0,0 +1,53 @@
+#ifndef CBITFIELD_H
+#define CBITFIELD_H
+
+#define BITSETCHUNKSIZE 32
+
+#define one ((uint32_t)1)
+
+struct bitset {
+  uint16_t size;
+  uint32_t bits[BITSET_SIZE/BITSETCHUNKSIZE+1];
+};
+
+static inline void bitset_set(struct bitset *bs,uint16_t index, uint8_t value) {
+  uint16_t base=index/BITSETCHUNKSIZE;
+  uint16_t offset=index%BITSETCHUNKSIZE;
+  if(value) {
+    bs->bits[base]|=(one<<offset);
+  } else {
+    bs->bits[base]&=~(one<<offset);
+  }
+}
+
+static inline void bitset_xor(struct bitset *bs,uint16_t index, uint8_t value) {
+  uint16_t base=index/BITSETCHUNKSIZE;
+  uint16_t offset=index%BITSETCHUNKSIZE;
+  if(value) {
+    bs->bits[base]^=(one<<offset);
+  }
+}
+
+static inline uint8_t bitset_get(struct bitset *bs,uint16_t index) {
+  uint16_t base=index/BITSETCHUNKSIZE;
+  uint16_t offset=index%BITSETCHUNKSIZE;
+  return (bs->bits[base]&(one<<offset))==(one<<offset);;
+}
+
+static inline uint16_t bitset_offset2(uint8_t x, uint8_t y) {
+  return ((uint16_t)x)+((uint16_t)y)*BITSET_X;
+}
+
+static inline void bitset_set2(struct bitset *bs, uint8_t x, uint8_t y, uint8_t value) {
+  bitset_set(bs,bitset_offset2(x,y),value);
+}
+
+static inline void bitset_xor2(struct bitset *bs, uint8_t x, uint8_t y, uint8_t value) {
+  bitset_xor(bs,bitset_offset2(x,y),value);
+}
+
+static inline uint8_t bitset_get2(struct bitset *bs,uint8_t x,uint8_t y) {
+  return bitset_get(bs,bitset_offset2(x,y));
+}
+
+#endif