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remove extra zero bit

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This commit is contained in:
Harald Barth 2021-11-19 00:34:56 +01:00
parent 55a789d65a
commit 50b854c526
2 changed files with 17 additions and 10 deletions
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25
DCCRMT.cpp
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@ -17,9 +17,13 @@
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "defines.h"
#include "DIAG.h"
#include "DCCRMT.h"
#include "DCCWaveform.h" // for MAX_PACKET_SIZE
#define DATA_LEN(X) ((X)*9+1) // Each byte has one bit extra and we have one EOF marker
#if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(4,2,0)
#error wrong IDF version
@ -39,11 +43,12 @@ void setDCCBit0(rmt_item32_t* item) {
item->duration1 = DCC_0_HALFPERIOD;
}
void setDCCBit0Last(rmt_item32_t* item) {
// special long zero to trigger scope
void setDCCBit0Long(rmt_item32_t* item) {
item->level0 = 1;
item->duration0 = DCC_0_HALFPERIOD + DCC_0_HALFPERIOD/10;
item->level1 = 0;
item->duration1 = DCC_0_HALFPERIOD;
item->duration1 = DCC_0_HALFPERIOD + DCC_0_HALFPERIOD/10;
}
void setEOT(rmt_item32_t* item) {
@ -62,11 +67,15 @@ RMTPin::RMTPin(byte pin, byte ch, byte plen) {
preamble = (rmt_item32_t*)malloc(preambleLen*sizeof(rmt_item32_t));
for (byte n=0; n<plen; n++)
setDCCBit1(preamble + n); // preamble bits
setDCCBit0(preamble + plen); // start of packet 0 bit
#ifdef SCOPE
setDCCBit0Long(preamble + plen); // start of packet 0 bit long version
#else
setDCCBit0(preamble + plen); // start of packet 0 bit normal version
#endif
setEOT(preamble + plen + 1); // EOT marker
// idle
idleLen = 29;
idleLen = 28;
idle = (rmt_item32_t*)malloc(idleLen*sizeof(rmt_item32_t));
for (byte n=0; n<8; n++) // 0 to 7
setDCCBit1(idle + n);
@ -75,11 +84,10 @@ RMTPin::RMTPin(byte pin, byte ch, byte plen) {
for (byte n=18; n<26; n++) // 18 to 25
setDCCBit1(idle + n);
setDCCBit1(idle + 26); // end bit
setDCCBit0Last(idle + 27); // finish always with 0
setEOT(idle + 28); // EOT marker
setEOT(idle + 27); // EOT marker
// data: max packet size today is 5 + checksum
maxDataLen = (5+1)*9+2; // Each byte has one bit extra and one 0 bit and one EOF marker
maxDataLen = DATA_LEN(MAX_PACKET_SIZE);
data = (rmt_item32_t*)malloc(maxDataLen*sizeof(rmt_item32_t));
rmt_config_t config;
@ -125,7 +133,7 @@ const byte transmitMask[] = {0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01};
bool RMTPin::RMTfillData(const byte buffer[], byte byteCount, byte repeatCount=1) {
if (dataReady == true || dataRepeat > 0) // we have still old work to do
return false;
if (byteCount*9+2 > maxDataLen) // this would overun our allocated memory for data
if (DATA_LEN(byteCount) > maxDataLen) // this would overun our allocated memory for data
return false; // something very broken, can not convert packet
// convert bytes to RMT stream of "bits"
@ -140,7 +148,6 @@ bool RMTPin::RMTfillData(const byte buffer[], byte byteCount, byte repeatCount=1
setDCCBit0(data + bitcounter++); // zero at end of each byte
}
setDCCBit1(data + bitcounter-1); // overwrite previous zero bit with one bit
setDCCBit0Last(data + bitcounter++); // extra 0 bit after end bit
setEOT(data + bitcounter++); // EOT marker
dataLen = bitcounter;
dataReady = true;

2
GITHUB_SHA.h
View File

@ -1 +1 @@
#define GITHUB_SHA "ESP32-2021115-23:10"
#define GITHUB_SHA "ESP32-2021119-00:26"