/* Copyright 2019 * * 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 2 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 "i2c_master.h" #include "pca9555.h" #include "debug.h" #define SLAVE_TO_ADDR(n) (n << 1) #define TIMEOUT 100 enum { CMD_INPUT_0 = 0, CMD_INPUT_1, CMD_OUTPUT_0, CMD_OUTPUT_1, CMD_INVERSION_0, CMD_INVERSION_1, CMD_CONFIG_0, CMD_CONFIG_1, }; void pca9555_init(uint8_t slave_addr) { static uint8_t s_init = 0; if (!s_init) { i2c_init(); s_init = 1; } // TODO: could check device connected // i2c_start(SLAVE_TO_ADDR(slave) | I2C_WRITE); // i2c_stop(); } void pca9555_set_config(uint8_t slave_addr, uint8_t port, uint8_t conf) { uint8_t addr = SLAVE_TO_ADDR(slave_addr); uint8_t cmd = port ? CMD_CONFIG_1 : CMD_CONFIG_0; i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT); if (ret != I2C_STATUS_SUCCESS) { print("pca9555_set_config::FAILED\n"); } } void pca9555_set_output(uint8_t slave_addr, uint8_t port, uint8_t conf) { uint8_t addr = SLAVE_TO_ADDR(slave_addr); uint8_t cmd = port ? CMD_OUTPUT_1 : CMD_OUTPUT_0; i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT); if (ret != I2C_STATUS_SUCCESS) { print("pca9555_set_output::FAILED\n"); } } uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port) { uint8_t addr = SLAVE_TO_ADDR(slave_addr); uint8_t cmd = port ? CMD_INPUT_1 : CMD_INPUT_0; uint8_t data = 0; i2c_status_t ret = i2c_readReg(addr, cmd, &data, sizeof(data), TIMEOUT); if (ret != I2C_STATUS_SUCCESS) { print("pca9555_readPins::FAILED\n"); } return data; } uint16_t pca9555_readAllPins(uint8_t slave_addr) { uint8_t addr = SLAVE_TO_ADDR(slave_addr); typedef union { uint8_t u8[2]; uint16_t u16; } data16; data16 data; i2c_status_t ret = i2c_readReg(addr, CMD_INPUT_0, &data.u8[0], sizeof(data), TIMEOUT); if (ret != I2C_STATUS_SUCCESS) { print("pca9555_readAllPins::FAILED\n"); } return data.u16; }