mirror of
https://github.com/BotChain-Robots/firmware.git
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136 lines
4.0 KiB
C
136 lines
4.0 KiB
C
#ifdef RMT_COMMUNICATIONS
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#include "driver/rmt_tx.h"
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// #ifdef MANCHESTER_40
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// #define RMT_RESOLUTION_HZ 40 * 1000 * 1000 // 40MHz resolution
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// #define RMT_DURATION_SYMBOL 10 //0.25 us bit duration
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// #elif NRZ_INVERTED
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// #ifdef NRZ_INVERTED_40_HZ
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// #define RMT_RESOLUTION_HZ 40 * 1000 * 1000 // 40MHz resolution
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// #else
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// #define RMT_RESOLUTION_HZ 20 * 1000 * 1000 // 20MHz resolution
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// #endif //NRZ_INVERTED_40_HZ
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// #ifdef NRZ_INVERTED_10
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// #define RMT_DURATION_SYMBOL 10 //0.5us bit duration
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// #elif NRZ_INVERTED_20
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// #define RMT_DURATION_SYMBOL 5 //0.25 us bit duration
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// #elif NRZ_INVERTED_2
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// #define RMT_DURATION_SYMBOL 2 //0.1 us bit duration
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// #else
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// #define RMT_DURATION_SYMBOL 20 //1us bit duration
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// #endif //NRZ_INVERTED_10
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// #else
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// #define RMT_RESOLUTION_HZ 1 * 1000 * 1000 // 1MHz resolution
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// #define RMT_DURATION_SYMBOL 10
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// #endif //MANCHESTER_40
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// #define NRZ_INVERTED //using NRZ_I
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#define RMT_RESOLUTION_HZ 40 * 1000 * 1000 // 40MHz resolution
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#define RMT_DURATION_SYMBOL 12 //0.6us
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// #define RMT_DURATION_SYMBOL ((RMT_RESOLUTION_HZ * 3) / 1000000) // duration time for a symbol - this is 3us
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#define RMT_DURATION_MAX (2 * RMT_DURATION_SYMBOL)
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// #define RMT_TX_GPIO GPIO_NUM_1 //RMT will use GPIO pin 1 to transmit (on one channel)
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// #define RMT_RX_GPIO GPIO_NUM_12 // RMT will use GPIO pin 12 to receive (on one channel)
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#ifndef NRZ_INVERTED
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//MANCHESTER ENCODING (ETHERNET STANDARD)
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/**
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* @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`)
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*
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*/
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static const rmt_symbol_word_t RMT_SYMBOL_ONE = {
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.duration0 = RMT_DURATION_SYMBOL,
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.level0 = 1,
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.duration1 = RMT_DURATION_SYMBOL,
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.level1 = 0,
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};
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/**
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* @brief This struct represents a 0 symbol being transmitted over RMT. This will create a rising edge (low for `RMT_DURATION_SYMBOL` and high for `RMT_DURATION_SYMBOL`)
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*
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*/
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static const rmt_symbol_word_t RMT_SYMBOL_ZERO = {
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.duration0 = RMT_DURATION_SYMBOL,
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.level0 = 0,
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.duration1 = RMT_DURATION_SYMBOL,
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.level1 = 1,
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};
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#else
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//Non-Return-to-Zero Inverted (NRZ-I)
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#define CONSEC_ZERO_THRESHOLD 3 //max number of consecutive zeros before adding a bit 1
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// Logic 1 inverts the current voltage state
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/**
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* @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`)
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*
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*/
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static const rmt_symbol_word_t RMT_SYMBOL_ONE_FALLING = {
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.duration0 = RMT_DURATION_SYMBOL,
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.level0 = 1,
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.duration1 = RMT_DURATION_SYMBOL,
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.level1 = 0,
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};
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/**
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* @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`)
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*
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*/
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static const rmt_symbol_word_t RMT_SYMBOL_ONE_RISING = {
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.duration0 = RMT_DURATION_SYMBOL,
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.level0 = 0,
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.duration1 = RMT_DURATION_SYMBOL,
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.level1 = 1,
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};
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/**
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* @brief This struct will represent a bit 0. In NRZ-I, this represents a no change in the voltage
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*
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*/
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static const rmt_symbol_word_t RMT_SYMBOL_ZERO_HIGH = {
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.duration0 = RMT_DURATION_SYMBOL,
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.level0 = 1,
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.duration1 = RMT_DURATION_SYMBOL,
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.level1 = 1,
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};
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/**
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* @brief This struct will represent a bit 0. In NRZ-I, this represents a no change in the voltage
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*
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*/
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static const rmt_symbol_word_t RMT_SYMBOL_ZERO_LOW = {
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.duration0 = RMT_DURATION_SYMBOL,
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.level0 = 0,
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.duration1 = RMT_DURATION_SYMBOL,
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.level1 = 0,
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};
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#endif //NRZ_INVERTED
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//not used at the moment
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// static const rmt_symbol_word_t RMT_SYMBOL_HIGH_STOP = {
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// .duration0 = RMT_DURATION_SYMBOL / 2,
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// .level0 = 1,
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// .duration1 = RMT_DURATION_SYMBOL / 2,
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// .level1 = 0,
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// };
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// static const rmt_symbol_word_t RMT_SYMBOL_LOW_STOP = {
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// .duration0 = RMT_DURATION_SYMBOL / 2,
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// .level0 = 0,
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// .duration1 = RMT_DURATION_SYMBOL / 2,
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// .level1 = 1,
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// };
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#endif //RMT_COMMUNICATIONS
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