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explain RMT variations

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Harald Barth 2024-10-12 21:41:40 +02:00
parent 21c01ab69a
commit 1d18d5dea5
1 changed files with 19 additions and 0 deletions
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DCCRMT.cpp
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@ -17,6 +17,25 @@
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>. * along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/ */
/*
* RMT has "channels" which us FIFO RAM where you place what you want to send
* or receive. Channels can be merged to get more words per channel.
*
* WROOM: 8 channels total of 512 words, 64 words per channel. We use currently
* channel 0+1 for 128 words for DCC MAIN and 2+3 for DCC PROG.
*
* S3: 8 channels total of 384 words. 4 channels dedicated for TX and 4 channels
* dedicated for RX. 48 words per channel. So for TX there are 4 channels and we
* could use them with 96 words for MAIN and PROG if DCC data does fit in there.
*
* C3: 4 channels total of 192 words. As we do not use RX we can use all for TX
* so the situation is the same as for the -S3
*
* C6, H2: 4 channels total of 192 words. 2 channels dedictaed for TX and
* 2 channels dedicated for RX. Half RMT capacity compared to the C3.
*
*/
#if defined(ARDUINO_ARCH_ESP32) #if defined(ARDUINO_ARCH_ESP32)
#include "defines.h" #include "defines.h"
#include "DIAG.h" #include "DIAG.h"