Regarding rmt_tx library to transmit rawData to Mitsubishi AC

[ESP_Sprite]

So He has already checked same AC with other board which is not ESP32 but different one in which he is able to send and receive data without any issue.

So, He is facing issue while using with ESP32 only. That is why he has post request over here and provided details.

If that's the case, he should have put that in the post. The more details that are provided, the better people can advise.

[Ritesh]

So He has already checked same AC with other board which is not ESP32 but different one in which he is able to send and receive data without any issue.

So, He is facing issue while using with ESP32 only. That is why he has post request over here and provided details.

If that's the case, he should have put that in the post. The more details that are provided, the better people can advise.

Yes. I totally agree with you that he should have put all details regarding issue which he has verified same AC with other device as well.

Hello Sam,

Would you please provide few more details like in which device you have verifies same AC with request and response which is working? So that people can understand it and can provide support to us.

Please put those details and other debug details which you have already checked from your end so that it will be helpful to move towards solution.

[sam_wesleyIcapo]

The code I am using is below for transmitter now:
#include <stdio.h>
#include <math.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include "freertos/ringbuf.h"
#include "esp_err.h"
#include "esp_log.h"
#include "driver/rmt.h"
#include "driver/periph_ctrl.h"
#include "soc/rmt_reg.h"
#include <driver/adc.h>
#include <rom/ets_sys.h>
#define Duty_Cycle 56 //in percent (10->50), usually 33 or 50
//TIP for true 50% use a value of 56, because of rounding errors
//TIP for true 40% use a value of 48, because of rounding errors
//TIP for true 33% use a value of 40, because of rounding errors

#define Carrier_Frequency 40000 //usually one of 38000, 40000, 36000, 56000, 33000, 30000


#define PERIOD (1000000+Carrier_Frequency/2)/Carrier_Frequency
#define HIGHTIME PERIOD*Duty_Cycle/100
#define LOWTIME PERIOD - HIGHTIME
#define RMT_TICK_10_US (80000000/100/100000)
uint32_t period;
uint32_t periodOffset;
void nec_tx_init()
{
rmt_config_t rmt_tx;
rmt_tx.channel = 1;
rmt_tx.gpio_num = 18;
rmt_tx.mem_block_num = 7;
rmt_tx.clk_div = 100;
rmt_tx.tx_config.loop_en = false;
rmt_tx.tx_config.carrier_duty_percent = 50;
rmt_tx.tx_config.carrier_freq_hz = 32768;
rmt_tx.tx_config.carrier_level = 1;
rmt_tx.tx_config.carrier_en = true;
rmt_tx.tx_config.idle_level = 0;
rmt_tx.tx_config.idle_output_en = true;
rmt_tx.rmt_mode = 0;
rmt_config(&rmt_tx);
rmt_driver_install(rmt_tx.channel, 0, 0);
}
int rawData[]={3172, 1586, 394, 394, 394, 1182, 394, 394, 394, 394, 394, 1182, 394, 394, 394, 1182, 394, 394, 394, 394, 394, 1182, 394, 1182, 394, 1182, 394, 394, 394, 1182, 394, 394, 394, 1182, 394, 1182, 394, 1182, 394, 394, 394, 394, 394, 394, 394, 394, 394, 1182, 394, 1182, 394, 394, 394, 1182, 394, 1182, 394, 394, 394, 394, 394, 1182, 394, 394, 394, 394, 394, 1182, 394, 394, 394, 394, 394, 1182, 394, 1182, 394, 394, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 394, 394, 1182, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 1182, 394, 394, 394, 394, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 1182, 394, 394, 394, 1182, 394, 1182, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 394, 1182, 394, 394, 394};
//int rawData[]={4384, 4322, 506, 1666, 506, 582, 506, 1668, 502, 1664, 506, 582, 504, 584, 506, 1664, 504, 586, 504, 582, 504, 1668, 502, 584, 504, 584, 508, 1662, 506, 1664, 506, 582, 506, 1666, 504, 582, 506, 582, 506, 582, 506, 1664, 506, 1664, 508, 1662, 506, 1664, 506, 1666, 506, 1662, 506, 1664, 506, 1666, 506, 582, 506, 584, 504, 582, 506, 586, 500, 584, 506, 580, 506, 584, 506, 582, 506, 582, 504, 1666, 504, 584, 506, 584, 504, 586, 506, 1662, 506, 1664, 506, 1664, 504, 1666, 504, 584, 508, 1662, 504, 1664, 506, 1664, 534, 5194, 4354, 4354, 510, 1662, 504, 582, 506, 1666, 504, 1664, 506, 584, 504, 584, 506, 1664, 506, 584, 506, 580, 506, 1664, 506, 584, 504, 584, 504, 1664, 504, 1664, 506, 584, 506, 1664, 504, 582, 504, 582, 506, 582, 506, 1664, 504, 1666, 504, 1664, 506, 1668, 502, 1666, 506, 1662, 504, 1666, 504, 1666, 504, 582, 508, 580, 506, 582, 504, 584, 506, 586, 502, 582, 504, 582, 506, 582, 506, 582, 504, 1664, 506, 582, 504, 584, 504, 586, 504, 1664, 504, 1664, 504, 1664, 506, 1664, 506, 582, 506, 1664, 506, 1664, 506, 1668, 504}; // COOLIX B21F08
//int rawData[]={3381,-1660,444,-1236,436,-1244,439,-428,413,-401,441,-399,442,-1238,435,-405,436,-431,411,-1243,440,-1240,442,-398,444,-1236,436,-431,411,-403,438,-1242,441,-1239,444,-423,408,-1245,438,-1243,440,-400,441,-399,443,-1237,435,-405,437,-430,411,-1243,440,-426,415,-399,443,-397,444,-396,435,-405,437,-404,437,-429,413,-401,440,-400,442,-398,443,-424,418,-395,436,-405,436,-404,438,-402,439,-401,440,-400,442,-398,443,-397,445,-395,436,-1245,438,-402,439,-427,415,-399,442,-398,443,-397,445,-1236,436,-1244,439,-401,441,-399,442,-398,443,-1238,435,-1245,438,-1242,441,-426,415,-425,417,-397,444,-396,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,21528,-8,27344,16379,1,0,0,4096,0,0,0,0,0,0,0,0,0,0,27376,16379,3052,16397,0,0,27,0,27520,16379,0,0,0,0,0,0,27408,16379,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,27420,16379,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-9472,-9637,27877,16379,27876,16379,27408,16379,1104,22593,10612,16379,15264,16379,27520,16379,0,0,20,0,-30106,21106,15491,-13113,27520,16379,0,0,5,0,26748,16379,28772,29295,116,-12996,-16757,-2030,-22319,191,1,0,27512,16379,0,0,33,6,5,0,0,0,0,0,0,0,0,0,-26800,16378,-26904,16378,-27008,16378,0,0,0,0,1,0,0,0,11020,16192,0,0,7496,16384,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-21248,-10458,-32761,16381,-32760,16381,-32750,17586,20623,5485,18228,17283,-28985,6209,32766,20757,-19497,13714,10505,-15309,13323,-1751,5684,-2195,20760,-13644,-13039,10118,-9632,1374,2141,31530,-13234,17362,14740,24452,27814,-9606,6861,17286,-17868,-27523,-13463,-20790,-12961,13269,-31556,-10883,-16326,20923,21393,31394,-2046,31646,14755,-23511,31183,442,18068,-18165,28076,16379,27996,16379,27996,16379,27996,16379,27996,16379,0,0,28020,16379,-32767,-32767};
//#include "Arduino.h"
//#include <IRremote.h>
//DMA_ATTR int rawData[512];
// LED on Huzzah32 board
const int LED_BUILTIN = 13;
// structure used to initialize RMT inputs
// NOTE: tag is used on the monitor outputs to distinguish between channels
struct rmt_rx_inits {
rmt_channel_t channel;
gpio_num_t gpio_num;
uint8_t clk_div;
uint8_t mem_block_num;
bool config_filter_en;
uint8_t config_filter_tics_thresh;
uint16_t config_idle_threshold;
char tag[10];
}rx_inputs[1] = {
{ 1, 19, 80, 1, false, 0, 50000, "Ch1" }
};

// initialize RMT receive channels
void rx_channels_init() {
rmt_config_t rmt_rx;
size_t i;
size_t len = sizeof(rx_inputs) / sizeof( rx_inputs[0] );
for ( i=0; i<len; i++ ) {
rmt_rx.channel = rx_inputs.channel;
rmt_rx.gpio_num = rx_inputs.gpio_num;
rmt_rx.clk_div = rx_inputs.clk_div;
rmt_rx.mem_block_num = rx_inputs.mem_block_num;
rmt_rx.rmt_mode = RMT_MODE_RX;

rmt_rx.rx_config.filter_en = rx_inputs.config_filter_en;
rmt_rx.rx_config.filter_ticks_thresh = rx_inputs.config_filter_tics_thresh;
rmt_rx.rx_config.idle_threshold = rx_inputs.config_idle_threshold;

rmt_config(&rmt_rx);
rmt_driver_install(rx_inputs.channel, 1000, 0);
}
}

// initialize visible LED on ESP32 board
static void visible_led_init() {
gpio_pad_select_gpio(LED_BUILTIN);
gpio_set_direction(LED_BUILTIN, GPIO_MODE_OUTPUT);
}

/* Converts the RMT level, duration into a positive or negative integer
* Compatible with the ESP32-RMT-server application
* Note: most IR receivers have active-low outputs, where the
* ESP32-RMT-server application has active-high oututs
* This function inverts the RMT receive level so the text output is
* compatible with ESP32-RMT-server application
*/
int dur( uint32_t level, uint32_t duration ) {
if ( level == 0 ) { return duration; }
else { return -1.0 * duration; }
}
uint32_t max(uint32_t n1,uint32_t period)
{
if(n1>=period)
return n1;
else
return period;
}
uint32_t min(uint32_t n1,uint32_t period)
{
if(n1>=period)
return period;
else
return n1;
}
uint32_t calcUSecPeriod(uint32_t hz) {
if (hz == 0) hz = 1; // Avoid Zero hz. Divide by Zero is nasty.
uint32_t period =
(1000000UL + hz / 2) / hz; // The equiv of round(1000000/hz).
// Apply the offset and ensure we don't result in a <= 0 value.
return max((uint32_t)1, period);
}
void _delayMicroseconds(uint32_t time)
{
ets_delay_us(time);
}
//IRsend irsend(18);
void app_main() {
int channel = 1;
int data_size=sizeof(rawData)/sizeof(rawData[0]);
printf("%d\n",data_size);
//rx_channels_init();
//visible_led_init();
//nec_tx_init();

size_t size = (sizeof(rmt_item32_t) * (data_size/2));
gpio_pad_select_gpio(GPIO_NUM_18);
gpio_pad_select_gpio(GPIO_NUM_16);
gpio_set_direction(GPIO_NUM_18,GPIO_MODE_DEF_OUTPUT);
gpio_set_direction(GPIO_NUM_19,GPIO_MODE_DEF_INPUT);
gpio_set_level(GPIO_NUM_18,0);
//gpio_set_level(GPIO_NUM_19,0);
int read_raw;
adc2_config_channel_atten( ADC2_CHANNEL_7, ADC_ATTEN_0db );
esp_err_t r;
int64_t sigTime;
int64_t now;
int64_t dur;
int i,t;
i=0;
rmt_item32_t* item = (rmt_item32_t*) malloc(size);
int item_num = data_size/2;
memset((void*) item, 0, size);
int _dutycycle;
uint32_t freq=38;
uint32_t onTimePeriod,offTimePeriod;
/*int dec[13];
int dec1=0;
size_t num_channels = sizeof(rx_inputs) / sizeof( rx_inputs[0] );
size_t c, i,t;
size_t rx_size = 0;
int x=0;
rmt_item32_t* items = NULL;
// define ringbuffer handle
RingbufHandle_t rb;
// start receiving IR data
for ( c=0; c<num_channels; c++ ) {
rmt_rx_start(rx_inputs[c].channel, 1);
}*/
//each item represent a cycle of waveform.
while(1)
{
_dutycycle = 50;
if (freq < 1000) // Were we given kHz? Supports the old call usage.
freq *= 1000;
uint32_t period = calcUSecPeriod(freq);
uint32_t usec;
// Nr. of uSeconds the LED will be on per pulse.
onTimePeriod = (period * _dutycycle) / 100;
// Nr. of uSeconds the LED will be off per pulse.
offTimePeriod = period - onTimePeriod;

for (uint16_t i = 0; i < data_size; i=i+2) {
if (i & 1) { // Odd bit.
gpio_set_level(GPIO_NUM_18,0);
if ((int)abs(rawData)>0)
_delayMicroseconds((int)abs(rawData));
} else { // Even bit.
// Handle the simple case of no required frequency modulation.
usec=(int)abs(rawData[i+1]);
// Not simple, so do it assuming frequency modulation.
uint16_t counter = 0;
uint32_t elapsed ;
uint32_t usecTimer = esp_timer_get_time();
uint32_t start=usecTimer;
uint32_t now=esp_timer_get_time();
// Cache the time taken so far. This saves us calling time, and we can be
// assured that we can't have odd math problems. i.e. unsigned under/overflow.
if (start <= now) // Check if the system timer has wrapped.
elapsed = now - start; // No wrap.
else
elapsed = 4294967295 - start + now; // Has wrapped
//elapsed = usecTimer.elapsed();

while (elapsed < usec) { // Loop until we've met/exceeded our required time.
gpio_set_level(GPIO_NUM_18,1);
// Calculate how long we should pulse on for.
// e.g. Are we to close to the end of our requested mark time (usec)?
_delayMicroseconds(min((uint32_t)onTimePeriod, usec - elapsed));
gpio_set_level(GPIO_NUM_18,0);
counter++;
if (elapsed + onTimePeriod >= usec)
break; // LED is now off & we've passed our allotted time.
// Wait for the lesser of the rest of the duty cycle, or the time remaining.
_delayMicroseconds(
min(usec - elapsed - onTimePeriod, (uint32_t)offTimePeriod));
if (start <= now) // Check if the system timer has wrapped.
elapsed = now - start; // No wrap.
else
elapsed = 4294967295 - start + now; // Has wrapped // Update & recache the actual elapsed time.
}
}
}
gpio_set_level(GPIO_NUM_18,0); // We potentially have ended with a mark(), so turn of the LED.
// check each receive channel
//for ( c=0; c<num_channels; c++ ) {
// get the ring buffer handle
/* rmt_get_ringbuf_handle(rx_inputs[0].channel, &rb);
// get items, if there are any
items = (rmt_item32_t*) xRingbufferReceive(rb, &rx_size, 1000);
if(items) {
//dec[i++]=gpio_get_level(GPIO_NUM_16);
for(int x=0;x<199;x++)
{
dec1=0;
for(int j=0;j<13;j++)
{
r=adc2_get_raw( ADC2_CHANNEL_7, ADC_WIDTH_12Bit, &read_raw);
if ( r == ESP_OK ) {
if((read_raw)>700)
dec[j]=1;
else
dec[j]=0;
//printf("%d\n", read_raw );
}
}
for(int j=0;j<13;j++)
dec1+=(int)pow(2,12-j)*dec[j];
printf("%d,",dec1);
}
}*/
//printf("%d",dec[i-1]);
/*if(i==13);
{
for(int j=0;j<13;j++)
dec1+=(int)pow(2,12-j)*dec[j];
printf("%d ",dec1);
i=0;
dec1=0;
}*/
/*rmt_item32_t* item = (rmt_item32_t*) malloc(size);
int item_num = data_size/2;
memset((void*) item, 0, size);*/
/*dur=0;
now=0;
sigTime=esp_timer_get_time();
for(i=0;i<data_size;i=i+2)
{
sigTime+=(int64_t)abs(rawData[i]);
now=esp_timer_get_time();
dur=sigTime-now;
if(dur!=0)
{
while((esp_timer_get_time()-now)<dur)
{
gpio_set_level(GPIO_NUM_18,1);
vTaskDelay((HIGHTIME - 5)/(10000*portTICK_PERIOD_MS));
gpio_set_level(GPIO_NUM_18,0);
vTaskDelay((LOWTIME - 6)/(10000*portTICK_PERIOD_MS));
//printf("%s\n","check1");
}
}
sigTime+=(int64_t)abs(rawData[i+1]);
now=esp_timer_get_time();
dur=sigTime-now;
printf("duration=%lld\n",dur);
if(dur!=0)
{

while((esp_timer_get_time()-now)<dur)
{
//printf("%lld\n",esp_timer_get_time()-now);
//printf("%s\n","check0");
}
}
// printf("%s\n","check");
}*/
/*for(i=data_size-1,t=0;i>=0;i=i-2,t=t+1)
{
item[t].level0 = 1;
item[t].level1 = 0;
item[t].duration0 = (int)abs(rawData[i])/ (10 * RMT_TICK_10_US);
if((i-1)<0)
item[t].duration1 = (int)abs(0x7fff)/(10 * RMT_TICK_10_US);
else
item[t].duration1 = (int)abs(rawData[i-1])/(10 * RMT_TICK_10_US);

}
//To send data according to the waveform items.
rmt_write_items(channel, item, item_num, true);
//Wait until sending is done.
rmt_wait_tx_done(channel,1);*/
//before we free the data, make sure sending is already done.
//free(item);*/
//vTaskDelay(1/(38*10*portTICK_PERIOD_MS));
vTaskDelay(10/portTICK_PERIOD_MS);
}
}
The AC receiver is not giving a beep while I transmit data.But with remote,I am getting at the AC Receiver end.I have checked the AC receiver,the data received is able to be decode while I transmit but the beep is missing.Can I know what might be the cause for beep missing?

[ESP_Sprite]

Again, no clue, I did not write the fimware for your AC so I can't tell why it would beep or not beep. What differences does your logic analyzer show when you analyze the signal from the ESP32 and a working board or the remote control?

[Ritesh]

Again, no clue, I did not write the fimware for your AC so I can't tell why it would beep or not beep. What differences does your logic analyzer show when you analyze the signal from the ESP32 and a working board or the remote control?

Yes. I totally agree with you.

Hello Sam,

Please check signals for working and not working board with proper analysis report and provide it here to move further for same.

[Ritesh]

Hi Sam,

I think transmitter part is working with Mitshubishi AC into your ESP32 Application. So, Would you please provide us updates with resolution for more details?

Also you are now trying for receiver part as per your application requirements.

[Ritesh]

Hi Sam,

Any update regarding this as per few last comments which we have provided?

[ESP_Sprite]

Hi Sam,

Any update regarding this as per few last comments which we have provided?

My guess is that he'll answer whenever he has more questions. Please do not needlessly go kick topics, *especially* not on other peoples behalf.

[sam_wesleyIcapo]

Hi Sir,
I checked my working code where I found out that we have send each byte in the reverse order and then accordingly I generated waveform for one and zero without using the ESP_RMT Library.In this way,I was able to run the code for Mitsubishi AC.Thanks for your support.Sorry for the late reply,I was working on another project for a urgent demo.

[Ritesh]

Hi Sir,
I checked my working code where I found out that we have send each byte in the reverse order and then accordingly I generated waveform for one and zero without using the ESP_RMT Library.In this way,I was able to run the code for Mitsubishi AC.Thanks for your support.Sorry for the late reply,I was working on another project for a urgent demo.

Great. Thanks for updates.

So, Now, Everything is cleared and working fine for both transmitter and receiver side? or still working on receiver side?

Ultimately issue was into your application code while RMT component with configurations are working fine.