mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 18:55:13 +03:00
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*
|
|
* This file is part of the I2Cscan project.
|
|
* Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "i2cscan.h"
|
|
#include "i2c.h"
|
|
//#include "usb.h"
|
|
|
|
uint8_t scanmode = 0;
|
|
static uint8_t i2caddr = I2C_ADDREND; // not active
|
|
|
|
uint8_t getI2Caddr(){
|
|
return i2caddr;
|
|
}
|
|
|
|
void i2c_init_scan_mode(){
|
|
i2caddr = 0;
|
|
scanmode = 1;
|
|
}
|
|
|
|
// return 1 if next addr is active & return in as `addr`
|
|
// if addresses are over, return 1 and set addr to I2C_NOADDR
|
|
// if scan mode inactive, return 0 and set addr to I2C_NOADDR
|
|
int i2c_scan_next_addr(uint8_t *addr){
|
|
*addr = i2caddr;
|
|
if(!scanmode || i2caddr == I2C_ADDREND){
|
|
*addr = I2C_ADDREND;
|
|
scanmode = 0;
|
|
return 0;
|
|
}
|
|
i2c_set_addr7(i2caddr++);
|
|
if(I2C_OK != i2c_7bit_send(NULL, 0)) return 0;
|
|
return 1;
|
|
}
|
|
|
|
int read_reg(uint8_t reg, uint8_t *val, uint8_t N){
|
|
if(N == 0){
|
|
if(I2C_OK != i2c_7bit_send_onebyte(reg, 0)) return 0;
|
|
return 1;
|
|
}
|
|
if(I2C_OK != i2c_7bit_send_onebyte(reg, 0)) return 0;
|
|
if(I2C_OK != i2c_7bit_receive(val, N)) return 0;
|
|
return 1;
|
|
}
|
|
|
|
int write_reg(uint8_t reg, uint8_t val){
|
|
uint8_t d[2] = {reg, val};
|
|
if(I2C_OK != i2c_7bit_send(d, 2)) return 0;
|
|
return 1;
|
|
}
|