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Initial version of rmt driver (#1525)

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* rmt driver initial version

* supporting conti mode plus interrupts

* using conitnous mode for sending more data

* working continous mode

* rmt driver cleanup after conti mode

* initial version of rmt driver

* adding a simple example

* adding channel and block locks

* modified of rmt interface for simpler/easier usage

* adding header sentinels, split interface to common and additional settings

* Fixes per code review + support for rx callback mode

* renamed internal structures and enums, fixed formatting

* cmake support for rmt

* refactored tx-conti interrupts to function to make it more readable

* added Tx and Rx examples

* added license headers

* minor updates per review

* used struct access, renamed defines, corrected diagram
This commit is contained in:
david-cermak
2018-09-17 23:19:27 +02:00
committed by Me No Dev
parent ea61563c69
commit 4e96bffe0e
7 changed files with 1314 additions and 0 deletions
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89
libraries/ESP32/examples/RMT/RMTWriteNeoPixel/RMTWriteNeoPixel.ino Normal file
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#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "Arduino.h"
#include "esp32-hal.h"
#define NR_OF_LEDS 8*4
#define NR_OF_ALL_BITS 24*NR_OF_LEDS
//
// Note: This example uses Neopixel LED board, 32 LEDs chained one
// after another, each RGB LED has its 24 bit value
// for color configuration (8b for each color)
//
// Bits encoded as pulses as follows:
//
// "0":
// +-------+ +--
// | | |
// | | |
// | | |
// ---| |--------------|
// + + +
// | 0.4us | 0.85 0us |
//
// "1":
// +-------------+ +--
// | | |
// | | |
// | | |
// | | |
// ---+ +-------+
// | 0.8us | 0.4us |
rmt_data_t led_data[NR_OF_ALL_BITS];
rmt_obj_t* rmt_send = NULL;
void setup()
{
Serial.begin(115200);
if ((rmt_send = rmtInit(18, true, RMT_MEM_64)) == NULL)
{
Serial.println("init sender failed\n");
}
float realTick = rmtSetTick(rmt_send, 100);
Serial.printf("real tick set to: %fns\n", realTick);
}
int color[] = { 0x55, 0x11, 0x77 }; // RGB value
int led_index = 0;
void loop()
{
// Init data with only one led ON
int led, col, bit;
int i=0;
for (led=0; led<NR_OF_LEDS; led++) {
for (col=0; col<3; col++ ) {
for (bit=0; bit<8; bit++){
if ( (color[col] & (1<<(8-bit))) && (led == led_index) ) {
led_data[i].level0 = 1;
led_data[i].duration0 = 8;
led_data[i].level1 = 0;
led_data[i].duration1 = 4;
} else {
led_data[i].level0 = 1;
led_data[i].duration0 = 4;
led_data[i].level1 = 0;
led_data[i].duration1 = 8;
}
i++;
}
}
}
// make the led travel in the pannel
if ((++led_index)>=NR_OF_LEDS) {
led_index = 0;
}
// Send the data
rmtWrite(rmt_send, led_data, NR_OF_ALL_BITS);
delay(100);
}