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This commit is contained in:
Bruno Rybársky
2025-05-04 00:40:42 +02:00
parent b41ea791a8
commit 16925fba79
4 changed files with 371 additions and 133 deletions
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2
CMakeLists.txt
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@@ -143,5 +143,7 @@ avr_generate_fixed_targets()
add_avr_executable(
avrtest
i2c.c
i2c.h
main.c
)

74
i2c.c Normal file
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@@ -0,0 +1,74 @@
/*
* I2C_Slave_C_File.c
*
*/
#include "i2c.h"
void I2C_Slave_Init(uint8_t slave_address)
{
TWAR = slave_address; /* Assign address in TWI address register */
TWCR = (1<<TWEN) | (1<<TWEA) | (1<<TWINT); /* Enable TWI, Enable ack generation, clear TWI interrupt */
}
int8_t I2C_Slave_Listen()
{
while(1)
{
uint8_t status; /* Declare variable */
while (!(TWCR & (1<<TWINT))); /* Wait to be addressed */
status = TWSR & 0xF8; /* Read TWI status register with masking lower three bits */
if (status == 0x60 || status == 0x68) /* Check weather own SLA+W received & ack returned (TWEA = 1) */
return 0; /* If yes then return 0 to indicate ack returned */
if (status == 0xA8 || status == 0xB0) /* Check weather own SLA+R received & ack returned (TWEA = 1) */
return 1; /* If yes then return 1 to indicate ack returned */
if (status == 0x70 || status == 0x78) /* Check weather general call received & ack returned (TWEA = 1) */
return 2; /* If yes then return 2 to indicate ack returned */
else
continue; /* Else continue */
}
}
int8_t I2C_Slave_Transmit(char data)
{
uint8_t status;
TWDR = data; /* Write data to TWDR to be transmitted */
TWCR = (1<<TWEN)|(1<<TWINT)|(1<<TWEA); /* Enable TWI and clear interrupt flag */
while (!(TWCR & (1<<TWINT))); /* Wait until TWI finish its current job (Write operation) */
status = TWSR & 0xF8; /* Read TWI status register with masking lower three bits */
if (status == 0xA0) /* Check weather STOP/REPEATED START received */
{
TWCR |= (1<<TWINT); /* If yes then clear interrupt flag & return -1 */
return -1;
}
if (status == 0xB8) /* Check weather data transmitted & ack received */
return 0; /* If yes then return 0 */
if (status == 0xC0) /* Check weather data transmitted & nack received */
{
TWCR |= (1<<TWINT); /* If yes then clear interrupt flag & return -2 */
return -2;
}
if (status == 0xC8) /* If last data byte transmitted with ack received TWEA = 0 */
return -3; /* If yes then return -3 */
else /* else return -4 */
return -4;
}
char I2C_Slave_Receive()
{
uint8_t status; /* Declare variable */
TWCR=(1<<TWEN)|(1<<TWEA)|(1<<TWINT); /* Enable TWI, generation of ack and clear interrupt flag */
while (!(TWCR & (1<<TWINT))); /* Wait until TWI finish its current job (read operation) */
status = TWSR & 0xF8; /* Read TWI status register with masking lower three bits */
if (status == 0x80 || status == 0x90) /* Check weather data received & ack returned (TWEA = 1) */
return TWDR; /* If yes then return received data */
if (status == 0x88 || status == 0x98) /* Check weather data received, nack returned and switched to not addressed slave mode */
return TWDR; /* If yes then return received data */
if (status == 0xA0) /* Check weather STOP/REPEATED START received */
{
TWCR |= (1<<TWINT); /* If yes then clear interrupt flag & return 0 */
return -1;
}
else
return -2; /* Else return 1 */
}

17
i2c.h Normal file
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@@ -0,0 +1,17 @@
/*
* I2C_Slave_H_File.h
*
*/
#ifndef I2C_SLAVE_H_FILE_H_
#define I2C_SLAVE_H_FILE_H_
#include <avr/io.h> /* Include AVR std. library file */
void I2C_Slave_Init(uint8_t slave_address); /* I2C slave initialize function with Slave address */
int8_t I2C_Slave_Listen(); /* I2C slave listen function */
int8_t I2C_Slave_Transmit(char data); /* I2C slave transmit function */
char I2C_Slave_Receive(); /* I2C slave receive function */
#endif /* I2C_SLAVE_H_FILE_H_ */

333
main.c
View File

@@ -2,9 +2,39 @@
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdlib.h>
#include "i2c.h"
#include <stdbool.h>
#include <avr/iom32.h>
#define REGISTER_SERVOA_POSITIONH 0
#define REGISTER_SERVOA_POSITIONL 1
#define REGISTER_SERVOA_KPA 2
#define REGISTER_SERVOA_KPB 3
#define REGISTER_SERVOA_KPC 4
#define REGISTER_SERVOA_KPD 5
#define REGISTER_SERVOA_KIA 6
#define REGISTER_SERVOA_KIB 7
#define REGISTER_SERVOA_KIC 8
#define REGISTER_SERVOA_KID 9
#define REGISTER_SERVOA_KDA 10
#define REGISTER_SERVOA_KDB 11
#define REGISTER_SERVOA_KDC 12
#define REGISTER_SERVOA_KDD 13
#define REGISTER_SERVOB_POSITIONH 14
#define REGISTER_SERVOB_POSITIONL 15
#define REGISTER_SERVOB_KPA 16
#define REGISTER_SERVOB_KPB 17
#define REGISTER_SERVOB_KPC 18
#define REGISTER_SERVOB_KPD 19
#define REGISTER_SERVOB_KIA 20
#define REGISTER_SERVOB_KIB 21
#define REGISTER_SERVOB_KIC 22
#define REGISTER_SERVOB_KID 23
#define REGISTER_SERVOB_KDA 24
#define REGISTER_SERVOB_KDB 25
#define REGISTER_SERVOB_KDC 26
#define REGISTER_SERVOB_KDD 27
// Motor A
#define MOTOR_A_POT 2
#define MOTOR_A_PIN_A PD5
@@ -19,15 +49,18 @@
#define MOTOR_B_PIN_A_OCR OCR0
#define MOTOR_B_PIN_B_OCR OCR1B
#define Slave_Address 0x20
// I2C Slave Register Map
#define REGISTER_COUNT 16
#define REGISTER_COUNT 27
volatile uint8_t registers[REGISTER_COUNT];
// I2C State
volatile uint8_t reg_address = 0;
volatile bool reg_address_received = false;
typedef struct {
typedef struct
{
uint8_t pot_channel;
volatile uint8_t *pin_a_port;
volatile uint8_t *pin_a_ddr;
@@ -54,9 +87,15 @@ typedef struct {
ServoMotor motor_a = {
.pot_channel = 2,
.pin_a_port = &PORTD, .pin_a_bit = PD5, .pin_a_ddr = &DDRD,
.pin_b_port = &PORTD, .pin_b_bit = PD7, .pin_b_ddr = &DDRD,
.kp = 1.0f, .ki = 0.0f, .kd = 0.0f,
.pin_a_port = &PORTD,
.pin_a_bit = PD5,
.pin_a_ddr = &DDRD,
.pin_b_port = &PORTD,
.pin_b_bit = PD7,
.pin_b_ddr = &DDRD,
.kp = 1.0f,
.ki = 0.0f,
.kd = 0.0f,
.pot_dir = 1,
.motor_dir = 1,
.ocr_a = &MOTOR_A_PIN_A_OCR,
@@ -65,24 +104,35 @@ ServoMotor motor_a = {
ServoMotor motor_b = {
.pot_channel = 3,
.pin_a_port = &PORTB, .pin_a_bit = PB3, .pin_a_ddr = &DDRB,
.pin_b_port = &PORTD, .pin_b_bit = PD4, .pin_b_ddr = &DDRD,
.kp = 1.0f, .ki = 0.0f, .kd = 0.0f,
.pin_a_port = &PORTB,
.pin_a_bit = PB3,
.pin_a_ddr = &DDRB,
.pin_b_port = &PORTD,
.pin_b_bit = PD4,
.pin_b_ddr = &DDRD,
.kp = 1.0f,
.ki = 0.0f,
.kd = 0.0f,
.pot_dir = 1,
.motor_dir = 1,
.ocr_a = &MOTOR_B_PIN_A_OCR,
.ocr_b = &MOTOR_B_PIN_B_OCR,
};
void set_ocr(volatile void *reg, bool is_16bit, uint16_t value) {
if (is_16bit) {
void set_ocr(volatile void *reg, bool is_16bit, uint16_t value)
{
if (is_16bit)
{
*((volatile uint16_t *)reg) = value;
} else {
}
else
{
*((volatile uint8_t *)reg) = (uint8_t)value;
}
}
void setup_pwm_motor_a(void) {
void setup_pwm_motor_a(void)
{
// Setup Timer1 (shared)
DDRD |= (1 << PD5); // OC1A
TCCR1A |= (1 << COM1A1);
@@ -98,7 +148,8 @@ void setup_pwm_motor_a(void) {
TCCR2 |= (1 << CS21);
}
void setup_pwm_motor_b(void) {
void setup_pwm_motor_b(void)
{
// Setup Timer0 (OC0 for PB3)
DDRB |= (1 << PB3);
TCCR0 |= (1 << WGM00) | (1 << WGM01); // Fast PWM
@@ -109,29 +160,28 @@ void setup_pwm_motor_b(void) {
DDRD |= (1 << PD4); // Just make sure it's output
}
uint16_t read_adc(uint8_t channel) {
// Mask channel to stay within 0–7
channel &= 0x07;
uint16_t read_adc(uint8_t channel)
{
// Select ADC channel with MUX bits, clear left-adjust (ADMUX[5] = 0)
ADMUX = (ADMUX & 0xF0) | channel;
ADMUX = (1 << REFS0) | (channel & 0x07);
// Start single conversion
ADCSRA |= (1 << ADSC);
// Wait for conversion to finish
while (ADCSRA & (1 << ADSC));
while (ADCSRA & (1 << ADSC))
;
// Return 10-bit ADC result
return ADC;
}
void control_motor(ServoMotor *motor, uint8_t pwm, int8_t direction) {
void control_motor(ServoMotor *motor, uint8_t pwm, int8_t direction)
{
direction *= motor->motor_dir;
if (pwm == 0) {
if (pwm == 0 || motor->target == 0)
{
// Coast: both LOW
*(motor->pin_a_port) &= ~(1 << motor->pin_a_bit);
*(motor->pin_b_port) &= ~(1 << motor->pin_b_bit);
@@ -140,21 +190,27 @@ void control_motor(ServoMotor *motor, uint8_t pwm, int8_t direction) {
return;
}
if (direction > 0) {
if (motor->target > 0)
{
if (direction > 0)
{
// PWM on A, B LOW
*(motor->pin_b_port) &= ~(1 << motor->pin_b_bit); // Direction LOW
set_ocr(motor->ocr_a, motor->ocr_a_16bit, pwm);
set_ocr(motor->ocr_b, motor->ocr_b_16bit, 0);
} else {
}
else
{
// PWM on B, A LOW
*(motor->pin_a_port) &= ~(1 << motor->pin_a_bit); // Direction LOW
set_ocr(motor->ocr_a, motor->ocr_a_16bit, 0);
set_ocr(motor->ocr_b, motor->ocr_b_16bit, pwm);
}
}
}
void update_motor(ServoMotor *motor) {
void update_motor(ServoMotor *motor)
{
motor->current = motor->pot_dir * read_adc(motor->pot_channel);
int16_t error = motor->target - motor->current;
@@ -166,77 +222,23 @@ void update_motor(ServoMotor *motor) {
int8_t direction = (output >= 0) ? 1 : -1;
uint8_t pwm = abs(output);
if (pwm > 255) pwm = 255;
if (pwm > 255)
pwm = 255;
control_motor(motor, pwm, direction);
}
uint16_t i = 127;
uint8_t i = 127;
uint8_t reg_pointer = 0;
bool expecting_address = true;
ISR(TWI_vect) {
switch (TWSR & 0xF8) {
case 0x60: // Own SLA+W received, ACK returned
case 0x68: // Arbitration lost, own SLA+W received, ACK returned
reg_address_received = false; // Reset for new transfer
TWCR |= (1 << TWINT) | (1 << TWEA); // ACK next byte
break;
case 0x80: // Data received, ACK returned
case 0x90: // Data received (General Call), ACK returned
if (!reg_address_received) {
reg_address = TWDR; // First received byte = register address
reg_address_received = true;
} else {
if (reg_address < REGISTER_COUNT) {
registers[reg_address++] = TWDR; // Store received data, then auto-increment address
}
}
TWCR |= (1 << TWINT) | (1 << TWEA); // ACK next byte
break;
case 0xA8: // Own SLA+R received, ACK returned
case 0xB0: // Arbitration lost, own SLA+R received, ACK returned
if (reg_address < REGISTER_COUNT) {
TWDR = registers[reg_address++]; // Load data to send
} else {
TWDR = 0xFF; // Out of range, send dummy
}
TWCR |= (1 << TWINT) | (1 << TWEA); // ACK next byte
break;
case 0xB8: // Data transmitted, ACK received
if (reg_address < REGISTER_COUNT) {
TWDR = registers[reg_address++];
} else {
TWDR = 0xFF;
}
TWCR |= (1 << TWINT) | (1 << TWEA); // ACK next byte
break;
case 0xC0: // Data transmitted, NACK received (done)
case 0xC8: // Last byte transmitted, ACK received
case 0x88: // Data received, NACK returned
TWCR |= (1 << TWINT) | (1 << TWEA); // Done
break;
case 0x00: // Bus error
TWCR |= (1 << TWSTO) | (1 << TWINT) | (1 << TWEA); // Recover
break;
default:
TWCR |= (1 << TWINT) | (1 << TWEA); // Default ACK
break;
}
}
int main(void) {
ADCSRA |= (1 << ADEN);
int main(void)
{
I2C_Slave_Init(Slave_Address);
DDRA = (1 << 7); // LED
PORTA = (1 << 7);
TWAR = (0x69 << 1) | (1 << 0);
TWCR = (1 << 6) | (1 << 2) | (1 << 0);
*(motor_a.pin_a_ddr) |= (1 << motor_a.pin_a_bit); // Direction pin output
*(motor_a.pin_b_ddr) |= (1 << motor_a.pin_b_bit); // Direction pin output
*(motor_b.pin_a_ddr) |= (1 << motor_b.pin_a_bit); // Direction pin output
@@ -246,13 +248,156 @@ int main(void) {
setup_pwm_motor_b();
while (1) {
if (!i++) {
while (1)
{
if (!i++)
{
PORTA ^= (1 << 7);
i = 127;
i = 60000;
}
update_motor(&motor_a);
update_motor(&motor_b);
_delay_ms(10);
switch (I2C_Slave_Listen())
{
case 0:
{
// WRITE
do
{
int8_t byte = I2C_Slave_Receive();
if (byte == -1)
break;
if (expecting_address)
{
reg_pointer = byte;
expecting_address = false;
}
else
{
ServoMotor *currentMotor;
uint8_t offset = 0;
// Decide which motor
if (reg_pointer >= REGISTER_SERVOB_POSITIONH)
{
offset = REGISTER_SERVOB_POSITIONH;
currentMotor = &motor_b;
}
else
{
offset = 0;
currentMotor = &motor_a;
}
uint8_t local_reg = reg_pointer - offset;
switch (local_reg)
{
case REGISTER_SERVOA_POSITIONH:
currentMotor->target &= 0x00FF;
currentMotor->target |= ((uint16_t)byte << 8);
break;
case REGISTER_SERVOA_POSITIONL:
currentMotor->target &= 0xFF00;
currentMotor->target |= byte;
break;
case REGISTER_SERVOA_KPA:
case REGISTER_SERVOA_KPB:
case REGISTER_SERVOA_KPC:
case REGISTER_SERVOA_KPD:
*((uint8_t *)&currentMotor->kp + (local_reg - REGISTER_SERVOA_KPA)) = byte;
break;
case REGISTER_SERVOA_KIA:
case REGISTER_SERVOA_KIB:
case REGISTER_SERVOA_KIC:
case REGISTER_SERVOA_KID:
*((uint8_t *)&currentMotor->ki + (local_reg - REGISTER_SERVOA_KIA)) = byte;
break;
case REGISTER_SERVOA_KDA:
case REGISTER_SERVOA_KDB:
case REGISTER_SERVOA_KDC:
case REGISTER_SERVOA_KDD:
*((uint8_t *)&currentMotor->kd + (local_reg - REGISTER_SERVOA_KDA)) = byte;
break;
default:
// Optional: save to general-purpose register map
registers[reg_pointer] = byte;
break;
}
reg_pointer++; // Optional auto-increment
}
} while (1);
expecting_address = true; // Reset for next transaction
break;
}
case 1:
{
// READ
char ret;
ServoMotor *currentMotor;
uint8_t offset = 0;
// Choose motor and adjust reg_pointer for local motor indexing
if (reg_pointer >= REGISTER_SERVOB_POSITIONH)
{
offset = REGISTER_SERVOB_POSITIONH;
currentMotor = &motor_b;
}
else
{
offset = 0;
currentMotor = &motor_a;
}
uint8_t local_reg = reg_pointer - offset;
switch (local_reg)
{
case REGISTER_SERVOA_POSITIONH:
ret = (currentMotor->current >> 8) & 0xFF;
break;
case REGISTER_SERVOA_POSITIONL:
ret = currentMotor->current & 0xFF;
break;
case REGISTER_SERVOA_KPA:
case REGISTER_SERVOA_KPB:
case REGISTER_SERVOA_KPC:
case REGISTER_SERVOA_KPD:
ret = *((uint8_t *)&currentMotor->kp + (local_reg - REGISTER_SERVOA_KPA));
break;
case REGISTER_SERVOA_KIA:
case REGISTER_SERVOA_KIB:
case REGISTER_SERVOA_KIC:
case REGISTER_SERVOA_KID:
ret = *((uint8_t *)&currentMotor->ki + (local_reg - REGISTER_SERVOA_KIA));
break;
case REGISTER_SERVOA_KDA:
case REGISTER_SERVOA_KDB:
case REGISTER_SERVOA_KDC:
case REGISTER_SERVOA_KDD:
ret = *((uint8_t *)&currentMotor->kd + (local_reg - REGISTER_SERVOA_KDA));
break;
default:
ret = registers[reg_pointer];
break;
}
I2C_Slave_Transmit(ret);
reg_pointer++;
break;
}
default:
break;
}
}
}