95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* Copyright 2019
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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 2 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_master.h"
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#include "pca9555.h"
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#include "debug.h"
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#define SLAVE_TO_ADDR(n) (n << 1)
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#define TIMEOUT 100
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enum {
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CMD_INPUT_0 = 0,
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CMD_INPUT_1,
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CMD_OUTPUT_0,
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CMD_OUTPUT_1,
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CMD_INVERSION_0,
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CMD_INVERSION_1,
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CMD_CONFIG_0,
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CMD_CONFIG_1,
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};
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void pca9555_init(uint8_t slave_addr) {
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static uint8_t s_init = 0;
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if (!s_init) {
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i2c_init();
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s_init = 1;
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}
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// TODO: could check device connected
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// i2c_start(SLAVE_TO_ADDR(slave) | I2C_WRITE);
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// i2c_stop();
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}
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void pca9555_set_config(uint8_t slave_addr, uint8_t port, uint8_t conf) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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uint8_t cmd = port ? CMD_CONFIG_1 : CMD_CONFIG_0;
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i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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print("pca9555_set_config::FAILED\n");
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}
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}
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void pca9555_set_output(uint8_t slave_addr, uint8_t port, uint8_t conf) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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uint8_t cmd = port ? CMD_OUTPUT_1 : CMD_OUTPUT_0;
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i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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print("pca9555_set_output::FAILED\n");
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}
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}
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uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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uint8_t cmd = port ? CMD_INPUT_1 : CMD_INPUT_0;
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uint8_t data = 0;
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i2c_status_t ret = i2c_readReg(addr, cmd, &data, sizeof(data), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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print("pca9555_readPins::FAILED\n");
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}
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return data;
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}
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uint16_t pca9555_readAllPins(uint8_t slave_addr) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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typedef union {
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uint8_t u8[2];
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uint16_t u16;
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} data16;
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data16 data;
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i2c_status_t ret = i2c_readReg(addr, CMD_INPUT_0, &data.u8[0], sizeof(data), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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print("pca9555_readAllPins::FAILED\n");
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}
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return data.u16;
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}
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