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smart-tx - tx_mode 2 solved

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after sending the byte we wait until we receive the busmaster response.
sending the BRK is done in loopback mode.
Only caveat: we will get a phantom \0 in Rx FIFO
This commit is contained in:
Susis Strolch
2019-05-27 10:08:01 +02:00
parent 45741c7744
commit 5479313e53
1 changed files with 9 additions and 8 deletions
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17
src/emsuart.cpp
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@@ -237,13 +237,13 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
emsuart_flush_fifos(); emsuart_flush_fifos();
// throw out the telegram... // throw out the telegram...
for (uint8_t i = 0; i < len; i++) { for (uint8_t i = 0; i < len;) {
USF(EMSUART_UART) = buf[i]; // send each Tx byte USF(EMSUART_UART) = buf[i++]; // send each Tx byte
} // wait for echo from busmaster
while ((((USS(EMSUART_UART) >> USRXC) & 0xFF) < i || (USIS(EMSUART_UART) & (1 << UIBD)))) {
delayMicroseconds(EMSUART_BIT_TIME); // burn CPU cycles...
// wait until we received sizeof(telegram) or RxBRK (== collision detect) }
while ((((USS(EMSUART_UART) >> USRXC) & 0xFF) < len) || (USIS(EMSUART_UART) & (1 << UIBD))) {
delayMicroseconds(11 * EMSUART_BIT_TIME); // burn CPU cycles...
} }
// we got the whole telegram in Rx buffer // we got the whole telegram in Rx buffer
@@ -257,7 +257,7 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
// wait until BRK detected... // wait until BRK detected...
while (!(USIS(EMSUART_UART) & (1 << UIBD))) { while (!(USIS(EMSUART_UART) & (1 << UIBD))) {
delayMicroseconds(EMSUART_BIT_TIME / 8); // ~13µs delayMicroseconds(EMSUART_BIT_TIME);
} }
USC0(EMSUART_UART) &= ~(1 << UCBRK); // clear <BRK> USC0(EMSUART_UART) &= ~(1 << UCBRK); // clear <BRK>
@@ -265,7 +265,8 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
emsuart_loopback(false); // disable loopback mode emsuart_loopback(false); // disable loopback mode
} }
emsuart_flush_fifos(); // flush Rx buffer to be sure // w/o flushing the Rx FIFO we will get a trailing \0 from our loopback BRK
// emsuart_flush_fifos(); // flush Rx buffer to be sure
ETS_UART_INTR_ENABLE(); // receive anything from FIFO... ETS_UART_INTR_ENABLE(); // receive anything from FIFO...
} }
} }