unsigned char _i2c_write(unsigned char device_addr, unsigned char sub_addr, unsigned char *buff, int ByteNo)
{
unsigned char i;
DEBUG_MSG(("<<=====================_i2c_write=======================>>\r\n"));
_i2c_start();
I2C_DELAY;
if(_i2c_write_byte(device_addr)) {
_i2c_stop();
DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n"));
return ERROR_CODE_WRITE_ADDR;
}
if(_i2c_write_byte(sub_addr)) {
_i2c_stop();
DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n"));
return ERROR_CODE_WRITE_ADDR;
}
for(i = 0; i<ByteNo; i++) {
if(_i2c_write_byte(buff[i])) {
_i2c_stop();
DEBUG_MSG(("<<=====================Write Error - Data=======================>>\r\n"));
return ERROR_CODE_WRITE_DATA;
}
}
I2C_DELAY;
_i2c_stop();
I2C_DELAY_LONG;
return ERROR_CODE_TRUE;
}
unsigned char _i2c_read(unsigned char device_addr, unsigned char sub_addr, unsigned char *buff, int ByteNo)
{
unsigned char i;
DEBUG_MSG(("<<=====================_i2c_read=======================>>\r\n"));
I2C_DELAY_LONG;
_i2c_start();
I2C_DELAY;
if(_i2c_write_byte(device_addr)) {
_i2c_stop();
DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n"));
return ERROR_CODE_READ_ADDR;
}
if(_i2c_write_byte(sub_addr)) {
_i2c_stop();
DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n"));
return ERROR_CODE_READ_ADDR;
}
_i2c_start();
I2C_DELAY;
if(_i2c_write_byte(device_addr+1)) {
_i2c_stop();
DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n"));
return ERROR_CODE_READ_ADDR;
}
for(i = 0; i<ByteNo; i++) buff[i] = _i2c_read_byte();
I2C_DELAY;
_i2c_stop();
I2C_DELAY_LONG;
return ERROR_CODE_TRUE;
}
void i2c_state_machine(){
switch(SMB0STA) {
case SMB_RESTART:
case SMB_START:
STA = 0;
STO = 0;
//send slave address
if (_i2c_params & I2C_WRITE)
SMB0DAT = _i2c_send_addr & 0xfe;
else
SMB0DAT = _i2c_send_addr | 0x01;
break;
case SMB_ADDR_NACK_R:
case SMB_ADDR_NACK:
//restart communication
STO = 1;
STA = 0;
STO = 0;
STA = 1;
break;
case SMB_ADDR_ACK_R:
case SMB_ADDR_ACK:
//send first byte
if(_i2c_send_len)
SMB0DAT = _i2c_send_data[0];
else
_i2c_stop();
break;
case SMB_DATA_ACK:
_i2c_send_index = _i2c_send_index +1;
//missing break: fall through
case SMB_DATA_NACK:
//send next byte/resend same byte
if (_i2c_send_index < _i2c_send_len) {
SMB0DAT = _i2c_send_data[_i2c_send_index];
} else {
_i2c_stop();
}
break;
case SMB_DATA_R_NACK:
case SMB_DATA_R_ACK:
_i2c_return[_i2c_read_index++] = SMB0DAT;
//controlla se ha finito di ricevere
if(_i2c_read_index == 2){
AA = 0;
//send nack next time
}
if(_i2c_read_index == _i2c_read_len){
STO = 1;
STA = 0;
EV_ENABLE(_i2c_callback);
i2c_lock = 0;
AA = 1;
}
break;
default:
break;
}
SI = 0;
}
int i2c_write_regs(i2c_t dev, uint8_t address, uint8_t reg, char *data, int length)
{
I2C_Type *i2c;
int n = 0;
switch (dev) {
#if I2C_0_EN
case I2C_0:
i2c = I2C_0_DEV;
break;
#endif
default:
return -1;
}
if (_i2c_start(i2c, address, I2C_FLAG_WRITE)) {
_i2c_reset(i2c);
return -1;
}
n = _i2c_transmit(i2c, ®, 1);
if (!n) {
_i2c_stop(i2c);
return n;
}
n = _i2c_transmit(i2c, (uint8_t *)data, length);
_i2c_stop(i2c);
return n;
}
int i2c_read_bytes(i2c_t dev, uint8_t address, char *data, int length)
{
I2C_Type *i2c;
int n = 0;
switch (dev) {
#if I2C_0_EN
case I2C_0:
i2c = I2C_0_DEV;
break;
#endif
default:
return -1;
}
if (_i2c_start(i2c, address, I2C_FLAG_READ)) {
_i2c_reset(i2c);
return -1;
}
n = _i2c_receive(i2c, (uint8_t *)data, length);
if (n < 0) {
_i2c_reset(i2c);
return -1;
}
_i2c_stop(i2c);
return n;
}
int i2c_write_bytes(i2c_t dev, uint8_t address, const void *data, int length)
{
I2C_Type *i2c;
int n = 0;
switch (dev) {
#if I2C_0_EN
case I2C_0:
i2c = I2C_0_DEV;
break;
#endif
default:
return -1;
}
if (_i2c_start(i2c, address, I2C_FLAG_WRITE)) {
_i2c_reset(i2c);
return -1;
}
n = _i2c_transmit(i2c, data, length);
_i2c_stop(i2c);
return n;
}
int i2c_read_regs(i2c_t dev, uint8_t address, uint8_t reg, void *data, int length)
{
I2C_Type *i2c;
int n = 0;
switch (dev) {
#if I2C_0_EN
case I2C_0:
i2c = I2C_0_DEV;
break;
#endif
default:
return -1;
}
if (_i2c_start(i2c, address, I2C_FLAG_WRITE)) {
_i2c_reset(i2c);
return -1;
}
/* send reg */
n = _i2c_transmit(i2c, ®, 1);
if (!n) {
_i2c_stop(i2c);
return n;
}
if (_i2c_restart(i2c, address, I2C_FLAG_READ)) {
_i2c_reset(i2c);
return -1;
}
n = _i2c_receive(i2c, (uint8_t *)data, length);
if (n < 0) {
_i2c_reset(i2c);
return -1;
}
_i2c_stop(i2c);
return n;
}
// calls _i2c_start with write=0,1 depending on LSB of i2c_addr
mp_obj_t i2c_obj_start(mp_obj_t self_in) {
pyb_i2c_obj_t *self = self_in;
if (self->i2c_state != I2C_STATE_IDLE) {
_i2c_stop(self->i2c_port);
self->i2c_state = I2C_STATE_IDLE;
}
if (_i2c_start(self->i2c_port) == true)
return mp_const_true;
return mp_const_false;
}
mp_obj_t i2c_obj_readAndStop(mp_obj_t self_in) {
pyb_i2c_obj_t *self = self_in;
if (self->i2c_state != I2C_STATE_READ) {
if (_i2c_restart(self->i2c_port, self->i2c_addr, 0) == false) {
_i2c_stop(self->i2c_port);
self->i2c_state = I2C_STATE_IDLE;
return mp_const_false;
}
}
uint8_t data = _i2c_read_nack(self->i2c_port);
self->i2c_state = I2C_STATE_IDLE;
return mp_obj_new_int(data);
}
mp_obj_t i2c_obj_write(mp_obj_t self_in, mp_obj_t data_in) {
pyb_i2c_obj_t *self = self_in;
if (self->i2c_state != I2C_STATE_WRITE) {
if (_i2c_restart(self->i2c_port, self->i2c_addr, 1) == false) {
_i2c_stop(self->i2c_port);
self->i2c_state = I2C_STATE_IDLE;
return mp_const_false;
}
self->i2c_state = I2C_STATE_WRITE;
}
uint8_t data = mp_obj_get_int(data_in);
if (_i2c_send_byte(self->i2c_port, data) == false)
return mp_const_false;
return mp_const_true;
}
mp_obj_t i2c_obj_stop(mp_obj_t self_in) {
pyb_i2c_obj_t *self = self_in;
_i2c_stop(self->i2c_port);
self->i2c_state = I2C_STATE_IDLE;
return mp_const_none;
}