1 files changed, 74 insertions, 0 deletions
diff --git a/firmware/e300/battery/spi.h b/firmware/e300/battery/spi.h
new file mode 100644
index 000000000..9a94dbc7c
--- /dev/null
+++ b/firmware/e300/battery/spi.h
@@ -0,0 +1,74 @@
+/* USRP E310 Firmware Atmel AVR SPI driver
+ * Copyright (C) 2014 Ettus Research
+ * This file is part of the USRP E310 Firmware
+ * The USRP E310 Firmware 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.
+ * The USRP E310 Firmware is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with the USRP E310 Firmware. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \file spi.h
+ * \brief Atmel AVR SPI driver
+ */
+
+#ifndef SPI_H
+#define SPI_H
+
+#include <stdlib.h>
+
+typedef enum spi_type {
+	SPI_TYPE_MASTER = 0x00,
+	SPI_TYPE_SLAVE = 0x01
+} spi_type_t;
+
+typedef enum spi_mode {
+	SPI_MODE_0	= 0x00, /** CPOL=0, CPHA=0 */
+	SPI_MODE_1	= 0x01, /** CPOL=0, CPHA=1 */
+	SPI_MODE_2	= 0x02, /** CPOL=1, CPHA=0 */
+	SPI_MODE_3	= 0x03, /** CPOL=1, CPHA=1 */
+} spi_mode_t;
+
+/* note that this assumes a clock speed of 8MHz */
+typedef enum spi_speed {
+	SPI_SPEED_2M	= 0x00,
+	SPI_SPEED_500K	= 0x01,
+	SPI_SPEED_125K	= 0x02,
+	SPI_SPEED_62_5K	= 0x03,
+} spi_speed_t;
+
+typedef enum spi_order {
+	SPI_MSB_FIRST	=	0x00,
+	SPI_LSB_FIRST	=	0x01,
+} spi_order_t;
+
+/**
+ * \brief Initialize the AVR's SPI module
+ * \param[in] master Operate as master
+ * \param[in] order Whether to send the LSB first
+ * \param[in] mode Which clock / phase configuration to use
+ * \param[in] speed Which speed to use
+ */
+void spi_init(spi_type_t type, spi_order_t order, spi_mode_t mode, spi_speed_t speed);
+
+/**
+ * \brief Transact one byte to the slave and receive one byte
+ * \param[in] mode Whether we're using the SPI in MSB or LSB first mode
+ * \param[in] speed Which speed to use, note that these speeds are based on a prescaler,
+		and the values are correct for a FCLK of 8 MHz
+*/
+uint8_t spi_transact(uint8_t data);
+
+void spi_transact_buf(uint8_t *in, uint8_t *out, uint8_t size);
+/**
+ * \brief Wait till transaction is done
+ */
+void spi_wait_till_done(void);
+
+#endif /* SPI_H */