/*!
* \brief Listen for incoming data from a master.
*
* If this function returns without error, the bus is blocked. The caller
* must immediately process the request and return a response by calling
* TwSlaveRespond().
*
* \note This function is only available on ATmega128 systems. The
* function is not reentrant.
*
* \param sla Points to a byte variable, which receives the slave
* address sent by the master. This can be used by the
* caller to determine whether the the interface has been
* addressed by a general call or its individual address.
* \param rxdata Points to a data buffer where the received data bytes
* are stored.
* \param rxsiz Specifies the maximum number of data bytes to receive.
* \param tmo Timeout in milliseconds. To disable timeout,
* set this parameter to NUT_WAIT_INFINITE.
*
* \return The number of bytes received, -1 in case of an error or timeout.
*/
int TwSlaveListen(u_char * sla, void *rxdata, u_short rxsiz, u_long tmo)
{
#ifndef __AVR_ENHANCED__
return -1;
#else
int rc = -1;
NutEnterCritical();
/* Initialize parameters for slave receive. */
tw_sm_err = 0;
tw_sr_siz = rxsiz;
tw_sr_buf = rxdata;
/*
* If the interface is currently not busy then enable it for
* address recognition.
*/
if(tw_if_bsy == 0) {
u_char twsr = inb(TWSR);
if((twsr & 0xF8) == TW_NO_INFO) {
if(tw_mt_len || tw_mr_siz)
outb(TWCR, _BV(TWEA) | _BV(TWEN) | _BV(TWIE) | _BV(TWSTA));
else
outb(TWCR, _BV(TWEA) | _BV(TWEN) | _BV(TWIE));
}
}
/* Clear the queue. */
//*broken?! NutEventBroadcastAsync(&tw_sr_que);
if (tw_sr_que == SIGNALED) {
tw_sr_que = 0;
}
/* Wait for a frame on the slave mode queue. */
if (NutEventWait(&tw_sr_que, tmo)) {
NutEnterCritical();
tw_sm_err = TWERR_TIMEOUT;
tw_sr_siz = 0;
NutExitCritical();
}
NutExitCritical();
/*
* Return the number of bytes received and the destination slave
* address, if no slave error occured. In this case the bus is
* blocked.
*/
if(tw_sm_err == 0) {
rc = tw_sr_idx;
*sla = tw_sm_sla;
}
return rc;
#endif /* __AVR_ENHANCED__ */
}
/*!
* \brief Execute flash controller command.
*
*/
int Avr32FlashcCmd(unsigned int cmd, uint32_t tmo)
{
int rc = 0;
/* Make sure that the previous command has finished. */
while (!flashc_is_ready()) {
if (tmo && --tmo < 1) {
return -1;
}
}
/* IRQ handlers are located in flash. Disable them. */
NutEnterCritical();
/* Write command. */
outr(AVR32_FLASHC.fcmd, AVR32_FLASHC_FCMD_KEY_KEY | cmd);
/* Wait for ready flag set. */
while (!flashc_is_ready()) {
if (tmo && --tmo < 1) {
rc = -1;
break;
}
}
/* Flash command finished. Re-enable IRQ handlers. */
NutExitCritical();
/* Check result. */
if (AVR32_FLASHC.fsr & (AVR32_FLASHC_FSR_LOCKE_MASK | AVR32_FLASHC_FSR_PROGE_MASK)) {
rc = -1;
}
return rc;
}
/*!
* \brief Register an interrupt handler.
*
* This function is typically called by device drivers.
*
* \param irq Interrupt number to be associated with this handler.
* \param handler This routine will be called by Nut/OS, when the
* specified interrupt occurs.
* \param arg Argument to be passed to the interrupt handler.
*
* \return 0 on success, -1 otherwise.
*/
int NutRegisterIrqHandler(uint8_t irq, void (*handler) (void *), void *arg)
{
if (irq >= IRQ_MAX)
return -1;
NutEnterCritical();
irq_handlers[irq].ir_arg = arg;
irq_handlers[irq].ir_handler = handler;
NutExitCritical();
return 0;
}
uint32_t NutGetTickCount(void)
{
uint32_t rc;
#ifdef __NUT_EMULATION__
struct timeval timeNow;
gettimeofday( &timeNow, NULL );
rc = (timeNow.tv_sec - timeStart.tv_sec) * 1000;
rc += (timeNow.tv_usec - timeStart.tv_usec) / 1000;
#else
NutEnterCritical();
rc = nut_ticks;
NutExitCritical();
#endif
return rc;
}
/*
* \return 0 on success, -1 in case of any errors.
*/
static int SendRawByte(AHDLCDCB * dcb, uint8_t ch, uint8_t flush)
{
/*
* If transmit buffer is full, wait until interrupt routine
* signals an empty buffer or until a timeout occurs.
*/
while ((uint8_t) (dcb->dcb_wr_idx + 1) == dcb->dcb_tx_idx) {
if (NutEventWait(&dcb->dcb_tx_rdy, dcb->dcb_wtimeout))
break;
}
/*
* If transmit buffer is still full, we have a write timeout.
*/
if ((uint8_t) (dcb->dcb_wr_idx + 1) == dcb->dcb_tx_idx) {
return -1;
}
/*
* Buffer has room for more data. Put the byte in the buffer
* and increment the write index.
*/
dcb->dcb_tx_buf[dcb->dcb_wr_idx] = ch;
dcb->dcb_wr_idx++;
/*
* If transmit buffer has become full and the transmitter
* is not active, then activate it.
*/
if (flush || (uint8_t) (dcb->dcb_wr_idx + 1) == dcb->dcb_tx_idx) {
NutEnterCritical();
outr(US1_IER, US_TXRDY);
NutExitCritical();
}
return 0;
}
/*!
* \brief Send response to a master.
*
* This function must be called as soon as possible after TwSlaveListen()
* returned successfully, even if no data needs to be returned. Not doing
* so will completely block the bus.
*
* \note This function is only available on ATmega128 systems.
*
* \param txdata Points to the data to transmit. Ignored, if the
* number of bytes to transmit is zero.
* \param txlen Number of data bytes to transmit.
* \param tmo Timeout in milliseconds. To disable timeout,
* set this parameter to NUT_WAIT_INFINITE.
*
* \return The number of bytes transmitted, -1 in case of an error or timeout.
*/
int TwSlaveRespond(void *txdata, u_short txlen, u_long tmo)
{
int rc = -1;
#ifdef __AVR_ENHANCED__
/* The bus is blocked. No critical section required. */
tw_st_buf = txdata;
tw_st_len = txlen;
/*
* If there is anything to transmit, start the interface.
*/
if (txlen) {
NutEnterCritical();
/* Clear the queue. */
//*broken?! NutEventBroadcastAsync(&tw_st_que);
if (tw_st_que == SIGNALED) {
tw_st_que = 0;
}
/* Release the bus, accepting SLA+R. */
outb(TWCR, TWGO | _BV(TWEA));
NutExitCritical();
if (NutEventWait(&tw_st_que, tmo)) {
tw_sm_err = TWERR_TIMEOUT;
}
NutEnterCritical();
tw_st_len = 0;
if (tw_sm_err) {
tw_sm_error = tw_sm_err;
} else {
rc = tw_st_idx;
}
NutExitCritical();
}
/*
* Nothing to transmit.
*/
else {
u_char twcr;
u_char twsr;
rc = 0;
/* Release the bus, not accepting SLA+R. */
NutEnterCritical();
twcr = inb(TWCR);
twsr = inb(TWSR);
/* Transmit start condition, if a master transfer is waiting. */
if (tw_mt_len || tw_mr_siz) {
outb(TWCR, TWGO | _BV(TWSTA));
}
/* Otherwise enter idle state. */
else {
tw_if_bsy = 0;
outb(TWCR, TWGO);
}
NutExitCritical();
}
#endif /* __AVR_ENHANCED__ */
return rc;
}
/*!
* \brief Transmit and/or receive data as a master.
*
* The two-wire serial interface must have been initialized by calling
* TwInit() before this function can be used.
*
* \note This function is only available on ATmega128 systems.
*
* \param sla Slave address of the destination. This slave address
* must be specified as a 7-bit address. For example, the
* PCF8574A may be configured to slave addresses from 0x38
* to 0x3F.
* \param txdata Points to the data to transmit. Ignored, if the number
* of data bytes to transmit is zero.
* \param txlen Number of data bytes to transmit. If zero, then the
* interface will not send any data to the slave device
* and will directly enter the master receive mode.
* \param rxdata Points to a buffer, where the received data will be
* stored. Ignored, if the maximum number of bytes to
* receive is zero.
* \param rxsiz Maximum number of bytes to receive. Set to zero, if
* no bytes are expected from the slave device.
* \param tmo Timeout in milliseconds. To disable timeout, set this
* parameter to NUT_WAIT_INFINITE.
*
* \return The number of bytes received, -1 in case of an error or timeout.
*/
int TwMasterTransact(u_char sla, CONST void *txdata, u_short txlen, void *rxdata, u_short rxsiz, u_long tmo)
{
int rc = -1;
#ifdef __AVR_ENHANCED__
/* This routine is marked reentrant, so lock the interface. */
if(NutEventWait(&tw_mm_mutex, 500)) {
tw_mm_err = TWERR_IF_LOCKED;
NutEventPost(&tw_mm_mutex);
return -1;
}
while(tw_if_bsy) {
NutSleep(63);
}
NutEnterCritical();
/*
* Set all parameters for master mode.
*/
tw_mm_sla = sla << 1;
tw_mm_err = 0;
tw_mt_len = txlen;
tw_mt_buf = txdata;
tw_mr_siz = rxsiz;
tw_mr_buf = rxdata;
/*
* Send a start condition if the interface is idle. If busy, then
* the interrupt routine will automatically initiate the transfer
* as soon as the interface becomes ready again.
*/
if(tw_if_bsy == 0) {
u_char twcr = inb(TWCR);
u_char twsr = inb(TWSR);
if((twsr & 0xF8) == TW_NO_INFO) {
if(tw_sr_siz) {
outb(TWCR, _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWSTA) | (twcr & _BV(TWSTO)));
}
else {
outb(TWCR, _BV(TWEN) | _BV(TWIE) | _BV(TWSTA) | (twcr & _BV(TWSTO)));
}
}
}
/* Clear the queue. */
//*broken?! NutEventBroadcastAsync(&tw_mm_que);
if (tw_mm_que == SIGNALED) {
tw_mm_que = 0;
}
NutExitCritical();
/*
* Wait for master transmission done.
*/
rc = -1;
if (NutEventWait(&tw_mm_que, tmo)) {
tw_mm_error = TWERR_TIMEOUT;
} else {
NutEnterCritical();
if (tw_mm_err) {
tw_mm_error = tw_mm_err;
} else {
rc = tw_mr_idx;
}
NutExitCritical();
}
/*
* Release the interface.
*/
NutEventPost(&tw_mm_mutex);
#endif /* __AVR_ENHANCED__ */
return rc;
}
