Software desenvolvido para a análise descrita no artigo Testes e avaliação da biblioteca SoftIIC, no ambito da exploração das interfaces disponiveis no Arduino para comunicação entre microcontroladores.
Hardware
- Arduino1 – Nano 328P + MPU6050 (bus I2C normal)
- Arduino2 – Nano 168 + VL53L0X (bus I2C normal)
O Arduino1 liga-se no bus I2C normal ao bus I2C secundário do Arduino2.
O programas master associado a este é:
Este programa deve ser executado no Arduino2.
SoftIIC_example_slave1
#include <avr/pgmspace.h>
#include <SoftIIC.h>
// Note: these can be *any* pins, not just a4/a5.
#define SDA_PIN A1
#define SCL_PIN A0
#define SERIAL_PORT_SPEED 115200
#define IIC_SPEED 50
static uint8_t current_register_address_for_50 = 0x00;
static uint8_t current_register_address_for_51 = 0x00;
PROGMEM const uint8_t MY_VIRTUAL_EEPROM50[] = {0x00, 0x0F, 0x01, 0x02, 0x03, 0xab};
PROGMEM const uint8_t MY_VIRTUAL_EEPROM51[] = {0xF0, 0xFF, 0xF1, 0xAA, 0x09, 0xa4};
SoftIIC my_SoftIIC = SoftIIC(SCL_PIN, SDA_PIN, IIC_SPEED, true, true, true);
boolean ledState = false;
void setup() {
Serial.begin(SERIAL_PORT_SPEED);
noInterrupts();
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
// Last, act as A 24c04 eeprom (read-only) slave
uint8_t successful_bytes = 0;
uint16_t TOTAL_EXPECTED_BYTES = 512;
while (successful_bytes < TOTAL_EXPECTED_BYTES) {
successful_bytes = successful_bytes + my_SoftIIC.SlaveHandleTransaction(respond_to_address, respond_to_command, respond_to_data, get_current_register_address, set_current_register_address, read_iic_slave, write_iic_slave);
}
// delay(10000);
}
//////////////////////////////////////////////////////////// These functions should be edited to give the iic slave a 'personality'. ////////////////////////////////////////////////////////////////
uint8_t virtualeeprom(uint8_t chipaddress, uint8_t registeraddress) {
uint8_t retval = 0xFF;
//if (chipaddress == 0x50 && registeraddress < (sizeof(MY_VIRTUAL_EEPROM50) / sizeof(uint8_t))) { retval = pgm_read_byte_near(MY_VIRTUAL_EEPROM50 + registeraddress); }
//if (chipaddress == 0x51 && registeraddress < (sizeof(MY_VIRTUAL_EEPROM51) / sizeof(uint8_t))) { retval = pgm_read_byte_near(MY_VIRTUAL_EEPROM51 + registeraddress); }
if(chipaddress == 0x50) {
retval = 0xFD;
}
if(chipaddress == 0x51) {
retval = 0xFE;
}
return retval;
}
uint8_t respond_to_address(uint8_t chipaddr){
if((chipaddr>>1)==0x50) {
ledState = !ledState;
digitalWrite(LED_BUILTIN, ledState);
return 0x01;
}
if((chipaddr>>1)==0x51) {
ledState = !ledState;
digitalWrite(LED_BUILTIN, ledState);
return 0x01;
}
return 0x00;
}
uint8_t respond_to_command(uint8_t commandaddr){
ledState = !ledState;
digitalWrite(LED_BUILTIN, ledState);
return 0x01;
}
uint8_t respond_to_data(uint8_t commandaddr){
ledState = !ledState;
digitalWrite(LED_BUILTIN, ledState);
return 0x01;
}
uint8_t get_current_register_address(uint8_t chipaddr) {
if (chipaddr == 0x50) { return current_register_address_for_50; }
if (chipaddr == 0x51) { return current_register_address_for_51; }
return 0x00;
}
uint8_t set_current_register_address(uint8_t chipaddr, uint8_t regaddr) {
if (chipaddr == 0x50) { current_register_address_for_50 = regaddr; }
if (chipaddr == 0x51) { current_register_address_for_51 = regaddr; }
return 0x00;
}
uint8_t read_iic_slave(uint8_t chipaddress, uint8_t* value) {
uint8_t registeraddress = get_current_register_address(chipaddress);
*value = virtualeeprom( chipaddress, registeraddress);
return 0x00;
}
uint8_t write_iic_slave(uint8_t chipaddr, uint8_t value) {
// Don't do anything with writes for this demo.
return 0x00;
}