Initial commit of source code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/spicmds.c

@@ -0,0 +1,22 @@
+// Commands for sending messages on an SPI bus
+//
+// Copyright (C) 2016  Kevin O'Connor <kevin@koconnor.net>
+//
+// This file may be distributed under the terms of the GNU GPLv3 license.
+
+#include "board/gpio.h" // gpio_out_write
+#include "command.h" // DECL_COMMAND
+
+void
+command_send_spi_message(uint32_t *args)
+{
+    // For now, this only implements enough to program an ad5206 digipot
+    uint8_t len = args[1];
+    char *msg = (void*)(size_t)args[2];
+    spi_config();
+    struct gpio_out pin = gpio_out_setup(args[0], 0);
+    spi_transfer(msg, len);
+    gpio_out_write(pin, 1);
+    sendf("spi_response response=%*s", len, msg);
+}
+DECL_COMMAND(command_send_spi_message, "send_spi_message pin=%u msg=%*s");