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//UPLOAD TO ATTINY85 in order to pass on readings from tuner without oscilations

#include <TinyWireS.h>

#ifndef TWI_RX_BUFFER_SIZE
#define TWI_RX_BUFFER_SIZE ( 16 )
#endif

#define I2C_SLAVE_ADDRESS 0x20
#define ADC_PIN A3

void readtoi2c () {
  
  int i;
  volatile uint8_t i2c_regs[] = {0,0};
  volatile unsigned int PotMeter;
  const byte reg_size = sizeof(i2c_regs);
  
  PotMeter = analogRead(ADC_PIN);
  i2c_regs[0] = PotMeter >> 8;
  i2c_regs[1] = PotMeter & 0xFF;

  TinyWireS.send(i2c_regs[0]);
  TinyWireS.send(i2c_regs[1]);

}

// the setup routine runs once when you press reset:
void setup() {
  
  //Setup I2C
  TinyWireS.begin(I2C_SLAVE_ADDRESS);
  TinyWireS.onRequest(readtoi2c);

  //Setup pins
  pinMode(ADC_PIN, INPUT);

}

// the loop routine runs over and over again forever:
void loop() {

}

Code: Select all

//Include Libraries
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "nvs.h"
#include "nvs_flash.h"
#include "esp_system.h"
#include "esp_log.h"
#include "esp_err.h"
#include "driver/i2c.h"
#include "driver/gpio.h"
#include "driver/adc.h"
#include "sdkconfig.h"
#include "math.h"

// Constants
#define ATTINY85_ADDR				0x20

void attiny_get_freq () {	
	uint8_t buffer[2] = {0,0};

	float freqSet;
	int i;
	
	i2c_config_t conf;
	conf.mode = I2C_MODE_MASTER;
	conf.sda_io_num = 18;
	conf.scl_io_num = 19;
	conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
	conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
	conf.master.clk_speed = 100000;
	ESP_ERROR_CHECK(i2c_param_config(I2C_NUM_0, &conf));
	
	i2c_cmd_handle_t cmd = i2c_cmd_link_create();
	i2c_master_start(cmd);
	i2c_master_write_byte(cmd, (ATTINY85_ADDR << 1) | I2C_MASTER_READ, 1);
	i2c_master_read_byte(cmd, &buffer[0], 0x0);
	i2c_master_read_byte(cmd, &buffer[1], 0x1);
	i2c_master_stop(cmd);
	i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000 / portTICK_RATE_MS);
	i2c_cmd_link_delete(cmd);
	
	freqSet = (((buffer[0]&0x3F)<<8)+buffer[1]);
	
	printf ("Current = %f MHz\n\n",freqSet);
	
	//vTaskDelay(pdMS_TO_TICKS(1000));
}


void app_main()
{
	
	// Install the I2C driver
	ESP_ERROR_CHECK(i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, 0, 0, 0));
	
	while (1) {
		// Run function to read attiny
		attiny_get_freq ();
		vTaskDelay(pdMS_TO_TICKS(100));
	}
}