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https://github.com/eddyem/stm32samples.git
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66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/*
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* This file is part of the MLX90640 project.
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* Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "i2c.h"
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#include "mlx90640.h"
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#include "strfunct.h"
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// read register value
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int read_reg(uint16_t reg, uint16_t *val){
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uint8_t _2bytes[2];
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_2bytes[0] = reg >> 8; // big endian!
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_2bytes[1] = reg & 0xff;
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if(I2C_OK != i2c_7bit_send(_2bytes, 2, 0)){
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DBG("Can't send address");
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return 0;
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}
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i2c_status s = i2c_7bit_receive_twobytes(_2bytes);
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if(I2C_OK != s){
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#ifdef EBUG
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DBG("Can't get info, s=");
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printu(s); NL();
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#endif
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return 0;
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}
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*val = _2bytes[0] << 8 | _2bytes[1]; // big endian -> little endian
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return 1;
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}
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// read N uint16_t values starting from `reg`
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// @return N of registers read
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int read_data(uint16_t reg, uint16_t *data, int N){
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if(N < 1 ) return 0;
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int i;
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for(i = 0; i < N; ++i){
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if(!read_reg(reg+i, data++)) break;
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}
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return i;
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}
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// write register value
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int write_reg(uint16_t reg, uint16_t val){
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// little endian -> big endian
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uint8_t _4bytes[4];
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_4bytes[0] = reg >> 8;
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_4bytes[1] = reg & 0xff;
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_4bytes[2] = val >> 8;
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_4bytes[3] = val & 0xff;
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if(I2C_OK != i2c_7bit_send(_4bytes, 4, 1)) return 0;
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return 1;
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}
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