Add firmware for the ATUSB IEEE 802.15.4 USB Adapter

[linux-libre-firmware.git] / atusb / spi.c

diff --git a/atusb/spi.c b/atusb/spi.c
new file mode 100644 (file)
index 0000000..3fa5715
--- /dev/null
+++ b/atusb/spi.c
@@ -0,0 +1,51 @@
+/*
+ * fw/spi.c - ATmega8 family SPI I/O
+ *
+ * Written 2011, 2013 by Werner Almesberger
+ * Copyright 2011, 2013 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <avr/io.h>
+
+#include "board.h"
+#include "spi.h"
+
+
+uint8_t spi_io(uint8_t v)
+{
+//      while (!(UCSR1A & 1 << UDRE1));
+       SPI_DATA = v;
+       SPI_WAIT_DONE();
+       return SPI_DATA;
+}
+
+
+void spi_end(void)
+{
+//      while (!(UCSR1A & 1 << TXC1));
+       SET(nSS);
+}
+
+
+void spi_recv_block(uint8_t *buf, uint8_t n)
+{
+       if (!n)
+               return;
+       SPI_DATA = 0;
+       while (--n) {
+               SPI_WAIT_DONE();
+               *buf++ = SPI_DATA;
+               SPI_DATA = 0;
+       }
+       SPI_WAIT_DONE();
+       *buf++ = SPI_DATA;
+}