diff options
Diffstat (limited to 'protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/AVR8/TWI_AVR8.c')
| -rw-r--r-- | protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/AVR8/TWI_AVR8.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/AVR8/TWI_AVR8.c b/protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/AVR8/TWI_AVR8.c new file mode 100644 index 0000000000..3cc3f0b6d3 --- /dev/null +++ b/protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/AVR8/TWI_AVR8.c @@ -0,0 +1,207 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2012.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+#include "../../../Common/Common.h"
+#if (ARCH == ARCH_AVR8) && defined(TWCR)
+
+#define __INCLUDE_FROM_TWI_C
+#include "../TWI.h"
+
+uint8_t TWI_StartTransmission(const uint8_t SlaveAddress,
+ const uint8_t TimeoutMS)
+{
+ for (;;)
+ {
+ bool BusCaptured = false;
+ uint16_t TimeoutRemaining;
+
+ TWCR = ((1 << TWINT) | (1 << TWSTA) | (1 << TWEN));
+
+ TimeoutRemaining = (TimeoutMS * 100);
+ while (TimeoutRemaining-- && !(BusCaptured))
+ {
+ if (TWCR & (1 << TWINT))
+ {
+ switch (TWSR & TW_STATUS_MASK)
+ {
+ case TW_START:
+ case TW_REP_START:
+ BusCaptured = true;
+ break;
+ case TW_MT_ARB_LOST:
+ TWCR = ((1 << TWINT) | (1 << TWSTA) | (1 << TWEN));
+ continue;
+ default:
+ TWCR = (1 << TWEN);
+ return TWI_ERROR_BusFault;
+ }
+ }
+
+ _delay_us(10);
+ }
+
+ if (!(TimeoutRemaining))
+ {
+ TWCR = (1 << TWEN);
+ return TWI_ERROR_BusCaptureTimeout;
+ }
+
+ TWDR = SlaveAddress;
+ TWCR = ((1 << TWINT) | (1 << TWEN));
+
+ TimeoutRemaining = (TimeoutMS * 100);
+ while (TimeoutRemaining--)
+ {
+ if (TWCR & (1 << TWINT))
+ break;
+
+ _delay_us(10);
+ }
+
+ if (!(TimeoutRemaining))
+ return TWI_ERROR_SlaveResponseTimeout;
+
+ switch (TWSR & TW_STATUS_MASK)
+ {
+ case TW_MT_SLA_ACK:
+ case TW_MR_SLA_ACK:
+ return TWI_ERROR_NoError;
+ default:
+ TWCR = ((1 << TWINT) | (1 << TWSTO) | (1 << TWEN));
+ return TWI_ERROR_SlaveNotReady;
+ }
+ }
+}
+
+bool TWI_SendByte(const uint8_t Byte)
+{
+ TWDR = Byte;
+ TWCR = ((1 << TWINT) | (1 << TWEN));
+ while (!(TWCR & (1 << TWINT)));
+
+ return ((TWSR & TW_STATUS_MASK) == TW_MT_DATA_ACK);
+}
+
+bool TWI_ReceiveByte(uint8_t* const Byte,
+ const bool LastByte)
+{
+ uint8_t TWCRMask;
+
+ if (LastByte)
+ TWCRMask = ((1 << TWINT) | (1 << TWEN));
+ else
+ TWCRMask = ((1 << TWINT) | (1 << TWEN) | (1 << TWEA));
+
+ TWCR = TWCRMask;
+ while (!(TWCR & (1 << TWINT)));
+ *Byte = TWDR;
+
+ uint8_t Status = (TWSR & TW_STATUS_MASK);
+
+ return ((LastByte) ? (Status == TW_MR_DATA_NACK) : (Status == TW_MR_DATA_ACK));
+}
+
+uint8_t TWI_ReadPacket(const uint8_t SlaveAddress,
+ const uint8_t TimeoutMS,
+ const uint8_t* InternalAddress,
+ uint8_t InternalAddressLen,
+ uint8_t* Buffer,
+ uint8_t Length)
+{
+ uint8_t ErrorCode;
+
+ if ((ErrorCode = TWI_StartTransmission((SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_WRITE,
+ TimeoutMS)) == TWI_ERROR_NoError)
+ {
+ while (InternalAddressLen--)
+ {
+ if (!(TWI_SendByte(*(InternalAddress++))))
+ {
+ ErrorCode = TWI_ERROR_SlaveNAK;
+ break;
+ }
+ }
+
+ if ((ErrorCode = TWI_StartTransmission((SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_READ,
+ TimeoutMS)) == TWI_ERROR_NoError)
+ {
+ while (Length--)
+ {
+ if (!(TWI_ReceiveByte(Buffer++, (Length == 0))))
+ {
+ ErrorCode = TWI_ERROR_SlaveNAK;
+ break;
+ }
+ }
+
+ TWI_StopTransmission();
+ }
+ }
+
+ return ErrorCode;
+}
+
+uint8_t TWI_WritePacket(const uint8_t SlaveAddress,
+ const uint8_t TimeoutMS,
+ const uint8_t* InternalAddress,
+ uint8_t InternalAddressLen,
+ const uint8_t* Buffer,
+ uint8_t Length)
+{
+ uint8_t ErrorCode;
+
+ if ((ErrorCode = TWI_StartTransmission((SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_WRITE,
+ TimeoutMS)) == TWI_ERROR_NoError)
+ {
+ while (InternalAddressLen--)
+ {
+ if (!(TWI_SendByte(*(InternalAddress++))))
+ {
+ ErrorCode = TWI_ERROR_SlaveNAK;
+ break;
+ }
+ }
+
+ while (Length--)
+ {
+ if (!(TWI_SendByte(*(Buffer++))))
+ {
+ ErrorCode = TWI_ERROR_SlaveNAK;
+ break;
+ }
+ }
+
+ TWI_StopTransmission();
+ }
+
+ return ErrorCode;
+}
+
+#endif
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