//! Transmits a series of 17 bit messages
//!
//! @param count => number of messages to send
//! @param data => pointer to message data buffer
//!
//! @note The first byte in the buffer is the MSB of the first message
//!
void bdmcf_tx(U8 count, U8 *data) {
while(count--) {
(void)bdmcf_txrx_start();
bdmcf_tx16(*(U16*)data);
data+=2;
}
}
//! Resynchronizes communication with the target in case of noise on the CLK line, etc.
//!
//! @return \ref BDM_RC_OK => success \n
//! \ref BDM_RC_NO_CONNECTION => no connection with target
//!
U8 bdmcf_resync(void) {
U8 bitCount;
U16 data;
(void)bdmcf_tx_msg(_BDMCF_CMD_NOP); // Send in 3 NOPs to clear any error
(void)bdmcf_tx_msg(_BDMCF_CMD_NOP);
(void)bdmcf_rx_msg(&data);
if ((data&3)==0) {
// The last NOP did not return the expected value (at least one of the two bits should be 1)
return(BDM_RC_NO_CONNECTION);
}
for (bitCount=20; bitCount>0; bitCount--) {
// Now start sending in another NOP and watch the result
if (bdmcf_txrx_start()==0) {
break; // The first 0 is the status bit
}
}
if (bitCount==0) { // No status bit found in 20 bits
return(BDM_RC_NO_CONNECTION);
}
// Transmitted & received the status bit, finish the NOP
bdmcf_tx16(_BDMCF_CMD_NOP);
return(BDM_RC_OK);
}
//! Transmits a 17 bit message
//!
//! @param data => data to Tx
//!
//! @return status bit
//!
U8 bdmcf_tx_msg(U16 data) {
U8 status;
status = bdmcf_txrx_start();
bdmcf_tx16(data);
return(status);
}
//! Transmits a series of 17 bit messages
//!
//! @param count => number of messages to send
//! @param data => pointer to message data buffer
//!
//! @note The first byte in the buffer is the MSB of the first message
//!
void bdmcf_tx(uint8_t count, uint8_t *data) {
while(count--) {
(void)bdmcf_txrx_start();
bdmcf_tx16(*(uint16_t*)data);
data+=2;
}
}
//! Transmits a 17 bit message
//!
//! @param data => data to Tx
//!
//! @return status bit
//!
uint8_t bdmcf_tx_msg(uint16_t data) {
uint8_t status;
status = bdmcf_txrx_start();
bdmcf_tx16(data);
return(status);
}
//! Resynchronizes communication with the target in case of noise on the CLK line, etc.
//!
//! @return \ref BDM_RC_OK => success \n
//! \ref BDM_RC_NO_CONNECTION => no connection with target
//!
U8 bdmcf_resync(void) {
U8 bitCount;
U16 data;
U8 status;
(void)bdmcf_tx_msg(_BDMCF_CMD_NOP); // Send in 3 NOPs to clear any error
(void)bdmcf_tx_msg(_BDMCF_CMD_NOP);
status = bdmcf_rx_msg(&data);
if (status == 1) {
// Check for cases that are unlikely to be chance on loss of sync
// and likely to confuse the sync which looks for a single zero bit
switch (data) {
case BDMCF_RES_BUS_ERROR : // 1,00000000,00000001
return BDM_RC_CF_BUS_ERROR;
case BDMCF_RES_NOT_READY : // 1,00000000,00000000
return BDM_RC_CF_NOT_READY;
default : // Fall through
break;
}
}
for (bitCount=20; bitCount>0; bitCount--) {
// Now start sending in another NOP and watch the result
if (bdmcf_txrx_start()==0) {
break; // The first 0 is the status bit
}
}
if (bitCount==0) { // No status bit found in 20 bits
return(BDM_RC_NO_CONNECTION);
}
// Transmitted & received the status bit, finish the NOP
bdmcf_tx16(_BDMCF_CMD_NOP);
return(BDM_RC_OK);
}
