Add CW code

3 files changed, 148 insertions, 0 deletions

diff --git a/src/fsm/README.md b/src/fsm/README.md
new file mode 100644
index 0000000..4fe3d28
--- /dev/null
+++ b/src/fsm/README.md
@@ -0,0 +1 @@
+First implementations of the FSM. Tests are coming...
diff --git a/src/fsm/src/cw.c b/src/fsm/src/cw.c
new file mode 100644
index 0000000..54fe1ab
--- /dev/null
+++ b/src/fsm/src/cw.c
@@ -0,0 +1,123 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Matthias P. Braendli
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#include "cw.h"
+#include "common.h"
+
+const uint8_t cw_mapping[60] = {
+    // Read bits from right to left
+
+    0b110101, //+ ASCII 43
+    0b110101, //, ASCII 44
+    0b1011110, //- ASCII 45
+
+    0b1010101, //., ASCII 46
+    0b110110, // / ASCII 47
+
+    0b100000, // 0, ASCII 48
+    0b100001, // 1
+    0b100011,
+    0b100111,
+    0b101111,
+    0b111111,
+    0b111110,
+    0b111100,
+    0b111000,
+    0b110000, // 9, ASCII 57
+
+    // The following are mostly invalid, but
+    // required to fill the gap in ASCII between
+    // numerals and capital letters
+    0b10, // :
+    0b10, // ;
+    0b10, // <
+    0b10, // =
+    0b10, // >
+    0b1110011, // ?
+    0b1101001, //@
+
+    0b101, // A  ASCII 65
+    0b11110,
+    0b11010,
+    0b1110,
+    0b11,
+    0b11011,
+    0b1100,
+    0b11111,
+    0b111,
+    0b10001,
+    0b1010,
+    0b11101,
+    0b100, //M
+    0b110,
+    0b1000,
+    0b11001,
+    0b10100,
+    0b1101,
+    0b1111,
+    0b10,
+    0b1011,
+    0b10111,
+    0b1001,
+    0b10110,
+    0b10010,
+    0b11100, // Z
+
+    0b101010, //Start, ASCII [
+    0b1010111, // SK , ASCII '\'
+};
+
+void cw_symbol(uint8_t sym)
+{
+    uint8_t p = 0;
+    uint8_t val = cw_mapping[sym];
+
+    while((val >> p) != 0b1) {
+
+        if (((val >> p) & 0b1) == 0b1) {
+            dit();
+        }
+        else {
+            dah();
+        }
+
+        p++;
+    }
+
+    delay_ms(4*DIT_DURATION);
+}
+
+// Transmit a string in morse code. Supported range:
+// All ASCII between '+' and '\', which includes
+// numerals and capital letters.
+void tx_cw(char* text)
+{
+    char* sym = text;
+    do {
+        cw_symbol(*sym - '+');
+        sym++;
+    } while (*sym != '\0');
+}
+
+
diff --git a/src/fsm/src/cw.h b/src/fsm/src/cw.h
new file mode 100644
index 0000000..6b4a214
--- /dev/null
+++ b/src/fsm/src/cw.h
@@ -0,0 +1,24 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Matthias P. Braendli
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+