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/* 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;
}
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