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decrease freq resolution for rmt to hopefully make it more reliable

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This commit is contained in:
Justin Chow
2025-09-28 13:35:50 -04:00
committed by Johnathon Slightham
parent 8a463bba10
commit 7b5a295432
6 changed files with 485 additions and 344 deletions
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90
components/rmt/include/RMTSymbols.h
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@@ -2,43 +2,11 @@
#include "driver/rmt_tx.h"
// #ifdef MANCHESTER_40
// #define RMT_RESOLUTION_HZ 40 * 1000 * 1000 // 40MHz resolution
// #define RMT_DURATION_SYMBOL 10 //0.25 us bit duration
// #elif NRZ_INVERTED
// #ifdef NRZ_INVERTED_40_HZ
// #define RMT_RESOLUTION_HZ 40 * 1000 * 1000 // 40MHz resolution
// #else
// #define RMT_RESOLUTION_HZ 20 * 1000 * 1000 // 20MHz resolution
// #endif //NRZ_INVERTED_40_HZ
// #ifdef NRZ_INVERTED_10
// #define RMT_DURATION_SYMBOL 10 //0.5us bit duration
// #elif NRZ_INVERTED_20
// #define RMT_DURATION_SYMBOL 5 //0.25 us bit duration
// #elif NRZ_INVERTED_2
// #define RMT_DURATION_SYMBOL 2 //0.1 us bit duration
// #else
// #define RMT_DURATION_SYMBOL 20 //1us bit duration
// #endif //NRZ_INVERTED_10
// #else
// #define RMT_RESOLUTION_HZ 1 * 1000 * 1000 // 1MHz resolution
// #define RMT_DURATION_SYMBOL 10
// #endif //MANCHESTER_40
// #define NRZ_INVERTED //using NRZ_I
#define RMT_RESOLUTION_HZ 40 * 1000 * 1000 // 40MHz resolution
#define RMT_DURATION_SYMBOL 12 //0.6us
// #define RMT_DURATION_SYMBOL ((RMT_RESOLUTION_HZ * 3) / 1000000) // duration time for a symbol - this is 3us
#define RMT_RESOLUTION_HZ 3 * 1000 * 1000 // 3MHz resolution
#define RMT_DURATION_SYMBOL 1 //0.667us
#define RMT_DURATION_MAX (2 * RMT_DURATION_SYMBOL)
// #define RMT_TX_GPIO GPIO_NUM_1 //RMT will use GPIO pin 1 to transmit (on one channel)
// #define RMT_RX_GPIO GPIO_NUM_12 // RMT will use GPIO pin 12 to receive (on one channel)
#ifndef NRZ_INVERTED
//MANCHESTER ENCODING (ETHERNET STANDARD)
/**
@@ -62,60 +30,6 @@ static const rmt_symbol_word_t RMT_SYMBOL_ZERO = {
.duration1 = RMT_DURATION_SYMBOL,
.level1 = 1,
};
#else
//Non-Return-to-Zero Inverted (NRZ-I)
#define CONSEC_ZERO_THRESHOLD 3 //max number of consecutive zeros before adding a bit 1
// Logic 1 inverts the current voltage state
/**
* @brief This struct represents a 1 symbol being transmitted over RMT. This will create a falling edge (low for `RMT_DURATION_SYMBOL` and high for `RMT_DURATION_SYMBOL`)
*
*/
static const rmt_symbol_word_t RMT_SYMBOL_ONE_FALLING = {
.duration0 = RMT_DURATION_SYMBOL,
.level0 = 1,
.duration1 = RMT_DURATION_SYMBOL,
.level1 = 0,
};
/**
* @brief This struct represents a 1 symbol being transmitted over RMT. This will create a rising edge (low for `RMT_DURATION_SYMBOL` and high for `RMT_DURATION_SYMBOL`)
*
*/
static const rmt_symbol_word_t RMT_SYMBOL_ONE_RISING = {
.duration0 = RMT_DURATION_SYMBOL,
.level0 = 0,
.duration1 = RMT_DURATION_SYMBOL,
.level1 = 1,
};
/**
* @brief This struct will represent a bit 0. In NRZ-I, this represents a no change in the voltage
*
*/
static const rmt_symbol_word_t RMT_SYMBOL_ZERO_HIGH = {
.duration0 = RMT_DURATION_SYMBOL,
.level0 = 1,
.duration1 = RMT_DURATION_SYMBOL,
.level1 = 1,
};
/**
* @brief This struct will represent a bit 0. In NRZ-I, this represents a no change in the voltage
*
*/
static const rmt_symbol_word_t RMT_SYMBOL_ZERO_LOW = {
.duration0 = RMT_DURATION_SYMBOL,
.level0 = 0,
.duration1 = RMT_DURATION_SYMBOL,
.level1 = 0,
};
#endif //NRZ_INVERTED
//not used at the moment