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digistump-sam/system/libsam/include/twi.h

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+/* ----------------------------------------------------------------------------
+ *         SAM Software Package License
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2011-2012, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following condition is met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+/**
+ * \file
+ *
+ * Interface for configuration the Two Wire Interface (TWI) peripheral.
+ *
+ */
+
+#ifndef _TWI_
+#define _TWI_
+
+/*------------------------------------------------------------------------------
+ *         Headers
+ *------------------------------------------------------------------------------*/
+
+#include "../chip.h"
+
+#include <stdint.h>
+
+/*----------------------------------------------------------------------------
+ *        Macros
+ *----------------------------------------------------------------------------*/
+/* Returns 1 if the TXRDY bit (ready to transmit data) is set in the given status register value.*/
+#define TWI_STATUS_TXRDY(status) (((status) & TWI_SR_TXRDY) == TWI_SR_TXRDY)
+
+/* Returns 1 if the RXRDY bit (ready to receive data) is set in the given status register value.*/
+#define TWI_STATUS_RXRDY(status) (((status) & TWI_SR_RXRDY) == TWI_SR_RXRDY)
+
+/* Returns 1 if the TXCOMP bit (transfer complete) is set in the given status register value.*/
+#define TWI_STATUS_TXCOMP(status) (((status) & TWI_SR_TXCOMP) == TWI_SR_TXCOMP)
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----------------------------------------------------------------------------
+ *        External function
+ *----------------------------------------------------------------------------*/
+
+extern void TWI_ConfigureMaster(Twi *pTwi, uint32_t twck, uint32_t mck);
+
+extern void TWI_ConfigureSlave(Twi *pTwi, uint8_t slaveAddress);
+
+extern void TWI_Stop(Twi *pTwi);
+
+extern void TWI_StartRead(
+    Twi *pTwi,
+    uint8_t address,
+    uint32_t iaddress,
+    uint8_t isize);
+
+extern uint8_t TWI_ReadByte(Twi *pTwi);
+
+extern void TWI_WriteByte(Twi *pTwi, uint8_t byte);
+
+extern void TWI_StartWrite(
+    Twi *pTwi,
+    uint8_t address,
+    uint32_t iaddress,
+    uint8_t isize,
+    uint8_t byte);
+
+extern uint8_t TWI_ByteReceived(Twi *pTwi);
+
+extern uint8_t TWI_ByteSent(Twi *pTwi);
+
+extern uint8_t TWI_TransferComplete(Twi *pTwi);
+
+extern void TWI_EnableIt(Twi *pTwi, uint32_t sources);
+
+extern void TWI_DisableIt(Twi *pTwi, uint32_t sources);
+
+extern uint32_t TWI_GetStatus(Twi *pTwi);
+
+extern uint32_t TWI_GetMaskedStatus(Twi *pTwi);
+
+extern void TWI_SendSTOPCondition(Twi *pTwi);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* #ifndef _TWI_ */