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Working baseline, works with -O0 -- -O3 AND -O0 with gcc 4.9.3 Ubuntu. TX to RX switch timing is the challenge. IOArduino.cpp may not work

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This commit is contained in:
danilo 2017-03-31 19:14:17 +02:00
parent 3a4451684f
commit aefe492f9b
5 changed files with 102 additions and 69 deletions
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60
IO.cpp
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@ -30,7 +30,8 @@ uint32_t m_frequency_tx;
uint8_t m_power;
extern volatile bool sle_request;
static volatile bool sle_pin = 0;
volatile bool torx_request = false;
bool volatile even = true;
CIO::CIO():
m_started(false),
@ -100,8 +101,10 @@ void CIO::process()
// Switch off the transmitter if needed
if (m_txBuffer.getData() == 0U && m_tx) {
setRX();
m_tx = false;
//while(CLK_pin()==0) { asm volatile ("nop"); }
//while(CLK_pin()) { asm volatile ("nop"); }
torx_request = true;
while(torx_request) { asm volatile ("nop"); }
}
if(m_modemState_prev == STATE_DSTAR)
@ -155,26 +158,12 @@ void CIO::interrupt()
if (!m_started)
return;
if (sle_request == true && m_tx)
{
if(CLK_pin() == 0)
{
sle_pin = 1;
SLE_pin(HIGH);
}
else if (sle_pin == 1)
{
SLE_pin(LOW);
SDATA_pin(LOW);
sle_request = false;
sle_pin = 0;
}
}
uint8_t clk = CLK_pin();
// we set the TX bit at TXD low, sampling of ADF7021 happens at rising clock
if (CLK_pin() == 0 && m_tx ) {
if (m_tx && clk == 0) {
m_txBuffer.get(bit);
even = !even;
#if defined(BIDIR_DATA_PIN)
if(bit)
@ -187,9 +176,26 @@ void CIO::interrupt()
else
TXD_pin(LOW);
#endif
}
// wait a brief period before raising SLE
if (sle_request == true) {
#if 1
asm volatile("mov r8, r8 \n\t"
"mov r8, r8 \n\t"
"mov r8, r8 \n\t"
);
#endif
SLE_pin(HIGH);
asm volatile("mov r8, r8 \n\t"
"mov r8, r8 \n\t"
"mov r8, r8 \n\t"
);
SLE_pin(LOW);
SDATA_pin(LOW);
sle_request = false;
}
}
// we sample the RX bit at rising TXD clock edge, so TXD must be 1 and we are not in tx mode
else if (CLK_pin() == 1 && !m_tx) {
if (!m_tx && clk == 1) {
if(RXD_pin())
bit = 1;
else
@ -197,6 +203,11 @@ void CIO::interrupt()
m_rxBuffer.put(bit);
}
if (torx_request == true && even == true && m_tx && clk == 0) {
setRX();
m_tx = false;
torx_request = false;
}
m_watchdog++;
@ -263,9 +274,8 @@ void CIO::write(uint8_t* data, uint16_t length)
// Switch the transmitter on if needed
if (!m_tx) {
setTX();
while(CLK_pin());
m_tx = true;
sle_pin = 0;
while (sle_request) { asm("nop"); }
}
}