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optimize Tx to handle phantom brk

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This commit is contained in:
Paul
2019-06-11 22:27:46 +02:00
parent c85e9d756b
commit 40659df6be
4 changed files with 50 additions and 69 deletions
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65
src/emsuart.cpp
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@@ -7,16 +7,12 @@
#include "emsuart.h"
#include "ems.h"
#include "ets_sys.h"
#include "osapi.h"
#include <Arduino.h>
#include <user_interface.h>
_EMSRxBuf * pEMSRxBuf;
_EMSRxBuf * paEMSRxBuf[EMS_MAXBUFFERS];
uint8_t emsRxBufIdx = 0;
uint8_t phantomBrk = 0; // tells Rx about upcoming phantom break from Tx
os_event_t recvTaskQueue[EMSUART_recvTaskQueueLen]; // our Rx queue
@@ -35,39 +31,28 @@ static void emsuart_rx_intr_handler(void * para) {
}
// fill IRQ buffer, by emptying Rx FIFO
if (U0IS & ((1 << UIFF) | (1 << UITO) | (1 << UIBD))) {
if (USIS(EMSUART_UART) & ((1 << UIFF) | (1 << UITO) | (1 << UIBD))) {
while ((USS(EMSUART_UART) >> USRXC) & 0xFF) {
uart_buffer[length++] = USF(EMSUART_UART);
}
// clear Rx FIFO full and Rx FIFO timeout interrupts
U0IC = (1 << UIFF) | (1 << UITO);
USIC(EMSUART_UART) = (1 << UIFF) | (1 << UITO);
}
// BREAK detection = End of EMS data block
if (USIS(EMSUART_UART) & ((1 << UIBD))) {
ETS_UART_INTR_DISABLE(); // disable all interrupts and clear them
U0IC = (1 << UIBD); // INT clear the BREAK detect interrupt
USIC(EMSUART_UART) = (1 << UIBD); // INT clear the BREAK detect interrupt
// we've send a BRK with loopback enabled, so we must compensate the phantom break
if (phantomBrk) {
length--; // compensate buffer length
phantomBrk = 0; // clear flag
}
pEMSRxBuf->length = length;
os_memcpy((void *)pEMSRxBuf->buffer, (void *)&uart_buffer, length); // copy data into transfer buffer, including the BRK 0x00 at the end
EMS_Sys_Status.emsRxStatus = EMS_RX_STATUS_IDLE; // set the status flag stating BRK has been received and we can start a new package
// copy data into transfer buffer
pEMSRxBuf->writePtr = length;
os_memcpy((void *)pEMSRxBuf->buffer, (void *)&uart_buffer, length);
system_os_post(EMSUART_recvTaskPrio, 0, 0); // call emsuart_recvTask() at next opportunity
// set the status flag stating BRK has been received and we can start a new package
EMS_Sys_Status.emsRxStatus = EMS_RX_STATUS_IDLE;
// call emsuart_recvTask() at next opportunity
system_os_post(EMSUART_recvTaskPrio, 0, 0);
// re-enable UART interrupts
ETS_UART_INTR_ENABLE();
ETS_UART_INTR_ENABLE(); // re-enable UART interrupts
}
}
@@ -78,8 +63,21 @@ static void emsuart_rx_intr_handler(void * para) {
*/
static void ICACHE_FLASH_ATTR emsuart_recvTask(os_event_t * events) {
_EMSRxBuf * pCurrent = pEMSRxBuf;
ems_parseTelegram((uint8_t *)pCurrent->buffer, (pCurrent->writePtr) - 1); // transmit EMS buffer, excluding the BRK
pEMSRxBuf = paEMSRxBuf[++emsRxBufIdx % EMS_MAXBUFFERS]; // next free EMS Receive buffer
uint8_t length = pCurrent->length; // number of bytes including the BRK at the end
// validate and transmit the EMS buffer, excluding the BRK
if (length == 2) {
// it's a poll or status code, single byte
ems_parseTelegram((uint8_t *)pCurrent->buffer, 1);
} else if ((length > 4) && (pCurrent->buffer[length - 2] != 0x00)) {
// ignore double BRK at the end, possibly from the Tx loopback
// also telegrams with no data value
ems_parseTelegram((uint8_t *)pCurrent->buffer, length - 1); // transmit EMS buffer, excluding the BRK
}
memset(pCurrent->buffer, 0x00, EMS_MAXBUFFERSIZE); // wipe memory just to be safe
pEMSRxBuf = paEMSRxBuf[++emsRxBufIdx % EMS_MAXBUFFERS]; // next free EMS Receive buffer
}
/*
@@ -119,8 +117,8 @@ void ICACHE_FLASH_ATTR emsuart_init() {
// conf1 params
// UCTOE = RX TimeOut enable (default is 1)
// UCTOT = RX TimeOut Threshold (7bit) = want this when no more data after 2 characters. (default is 2)
// UCFFT = RX FIFO Full Threshold (7 bit) = want this to be 31 for 32 bytes of buffer. (default was 127).
// UCTOT = RX TimeOut Threshold (7 bit) = want this when no more data after 2 characters (default is 2)
// UCFFT = RX FIFO Full Threshold (7 bit) = want this to be 31 for 32 bytes of buffer (default was 127)
// see https://www.espressif.com/sites/default/files/documentation/esp8266-technical_reference_en.pdf
USC1(EMSUART_UART) = 0; // reset config first
USC1(EMSUART_UART) = (EMS_MAX_TELEGRAM_LENGTH << UCFFT) | (0x02 << UCTOT) | (1 << UCTOE); // enable interupts
@@ -130,14 +128,14 @@ void ICACHE_FLASH_ATTR emsuart_init() {
USIE(EMSUART_UART) = 0; // disable all interrupts
// enable rx break, fifo full and timeout.
// not frame error UIFR (because they are too frequent) or overflow UIOF because our buffer is only max 32 bytes
// but not frame error UIFR (because they are too frequent) or overflow UIOF because our buffer is only max 32 bytes
USIE(EMSUART_UART) = (1 << UIBD) | (1 << UIFF) | (1 << UITO);
// set up interrupt callbacks for Rx
system_os_task(emsuart_recvTask, EMSUART_recvTaskPrio, recvTaskQueue, EMSUART_recvTaskQueueLen);
// disable esp debug which will go to Tx and mess up the line
system_set_os_print(0); // https://github.com/espruino/Espruino/issues/655
// disable esp debug which will go to Tx and mess up the line - see https://github.com/espruino/Espruino/issues/655
system_set_os_print(0);
// swap Rx and Tx pins to use GPIO13 (D7) and GPIO15 (D8) respectively
#ifndef NO_UART_SWAP
@@ -206,6 +204,9 @@ static inline void ICACHE_FLASH_ATTR emsuart_loopback(bool enable) {
* Send to Tx, ending with a <BRK>
*/
void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
if (len == 0)
return;
if (EMS_Sys_Status.emsTxMode == 0) { // classic mode logic
for (uint8_t i = 0; i < len; i++) {
USF(EMSUART_UART) = buf[i];
@@ -258,8 +259,6 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
// otherwise we send the final Tx-BRK in the loopback and re=enable Rx-INT.
// worst case, we'll see an additional Rx-BRK...
if (!(USIS(EMSUART_UART) & (1 << UIBD))) {
phantomBrk = 1; // tell Rx to expect a phantom BRK
// no bus collision - send terminating BRK signal
emsuart_loopback(true);
USC0(EMSUART_UART) |= (1 << UCBRK); // set <BRK>
@@ -268,13 +267,13 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
while (!(USIS(EMSUART_UART) & (1 << UIBD))) {
delayMicroseconds(EMSUART_BIT_TIME);
}
USC0(EMSUART_UART) &= ~(1 << UCBRK); // clear <BRK>
USIC(EMSUART_UART) = (1 << UIBD); // clear BRK detect IRQ
emsuart_loopback(false); // disable loopback mode
}
// w/o flushing the Rx FIFO we will get a trailing \0 from our loopback BRK
ETS_UART_INTR_ENABLE(); // receive anything from FIFO...
}
}