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Added master mode hardware TWI driver.

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Fixed a bug in the incomplete Webserver project, where the packet data was not being written to and read from the correct buffer address.
This commit is contained in:
Dean Camera 2010-01-19 00:25:26 +00:00
parent c299552ab3
commit 2746154652
6 changed files with 274 additions and 6 deletions
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54
LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c Normal file
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/*
Copyright (C) Dean Camera, 2010.
dean [at] fourwalledcubicle [dot] com
www.fourwalledcubicle.com
*/
#include "TWI.h"
bool TWI_StartTransmission(uint8_t SlaveAddress)
{
for (;;)
{
uint8_t IterationsRemaining = 50;
bool BusCaptured = false;
while (IterationsRemaining-- && !BusCaptured)
{
TWCR = ((1 << TWINT) | (1 << TWSTA) | (1 << TWEN));
while (!(TWCR & (1 << TWINT)));
switch (TWSR & TW_STATUS_MASK)
{
case TW_START:
case TW_REP_START:
BusCaptured = true;
break;
case TW_MT_ARB_LOST:
continue;
default:
return false;
}
}
if (!(BusCaptured))
return false;
TWDR = SlaveAddress;
TWCR = ((1 << TWINT) | (1 << TWEN));
while (!(TWCR & (1 << TWINT)));
GPIOR0 = (TWSR & TW_STATUS_MASK);
switch (TWSR & TW_STATUS_MASK)
{
case TW_MT_SLA_ACK:
case TW_MR_SLA_ACK:
return true;
default:
TWI_StopTransmission();
break;
}
}
}