HomeEnergyMeter/main/ir_transmit.c

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "esp_log.h"
#include "driver/rmt.h"

#include "toshiba_ir.h"
#include "config.h"

// RMT values
#define RMT_TX_CHANNEL RMT_CHANNEL_0
#define RMT_TX_GPIO    GPIO_NUM_26
// channel clock period = 1 uS
#define RMT_CLK_DIV    80

// Variable that holds the IR protocol transmission. 1 start bit, 72 data bits and one stop bit
rmt_item32_t toshiba_rmt[1 + 72 + 1 + 1];

QueueHandle_t toshibaTxQueue = NULL;

void toshibaTxTask(void *pvParameter)
{
	ESP_LOGI("IR_TRANSMIT", "toshibaTxTask() starting.");

	uint8_t data[8];
    	
	while( true ) {
		if( xQueueReceive( toshibaTxQueue, data, 100 ) == pdTRUE ) {
			ESP_LOGI("IR_TRANSMIT","Received a TX from MQTT");

			uint8_t irPair = 1;
			for(uint8_t b=0;b<kToshibaNumberOfBits;b++) {
				
				uint8_t byteNo = b / 8;
				uint8_t shiftBits = b % 8;
				uint8_t bit_data = (1u << (7-shiftBits)) & data[byteNo];
				uint32_t space = bit_data ? kToshibaAcOneSpace : kToshibaAcZeroSpace;

				toshiba_rmt[irPair].val = (kToshibaAcBitMark << 0) | (1 << 15) | (space << 16);    // Header of IR Transmit 

				irPair++;
			}

			ESP_ERROR_CHECK(rmt_write_items(RMT_TX_CHANNEL, &(toshiba_rmt[0]), 1+72+1, true));
		}
	}
}



void initIrTransmit() {

    rmt_config_t rmt_tx;
	rmt_tx.rmt_mode = RMT_MODE_TX;
	rmt_tx.channel  = RMT_TX_CHANNEL;
	rmt_tx.gpio_num = GPIO_IR_TX_DATA;
	rmt_tx.mem_block_num = 1;
	rmt_tx.clk_div = RMT_CLK_DIV;
	rmt_tx.tx_config.loop_en = false;
	rmt_tx.tx_config.carrier_duty_percent = 30;
	rmt_tx.tx_config.carrier_freq_hz = 38000;
	rmt_tx.tx_config.carrier_level   = RMT_CARRIER_LEVEL_HIGH;
	rmt_tx.tx_config.carrier_en      = true;
	rmt_tx.tx_config.idle_level      = RMT_IDLE_LEVEL_LOW;
	rmt_tx.tx_config.idle_output_en  = true;
    rmt_tx.flags = 0;
	
	ESP_ERROR_CHECK( rmt_config(&rmt_tx) );
	ESP_ERROR_CHECK( rmt_driver_install(rmt_tx.channel, 0, 0) );

    // Init the ir data field
    toshiba_rmt[0].val = (kToshibaAcHdrMark << 0) | (1 << 15) | (kToshibaAcHdrSpace << 16);    // Header of IR Transmit
    toshiba_rmt[73].val = (kToshibaAcBitMark << 0) | (1 << 15) | (kToshibaAcZeroSpace << 16);    // Header of IR Transmit
    toshiba_rmt[74].val = (1 << 16);    // End marker

    // 0x47503FC
    // 0x1FE823A

    for(int i=1;i<73;i++) {

        toshiba_rmt[i].val = (kToshibaAcBitMark << 0) | (1 << 15) | (kToshibaAcZeroSpace << 16);    // Header of IR Transmit
    }

    toshibaTxQueue = xQueueCreate( 5, kToshibaNumberOfBytes );
	xTaskCreatePinnedToCore(toshibaTxTask, "toshibaTxTask", 1024*10, NULL, 2, NULL,0);

	ESP_LOGI("IR_TRANSMIT","Init done.");
}