diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/pca9555.c | 78 | ||||
| -rw-r--r-- | drivers/gpio/pca9555.h | 55 |
2 files changed, 133 insertions, 0 deletions
diff --git a/drivers/gpio/pca9555.c b/drivers/gpio/pca9555.c new file mode 100644 index 0000000000..b0e542d8de --- /dev/null +++ b/drivers/gpio/pca9555.c @@ -0,0 +1,78 @@ +/* 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; +} diff --git a/drivers/gpio/pca9555.h b/drivers/gpio/pca9555.h new file mode 100644 index 0000000000..ebb97e2f30 --- /dev/null +++ b/drivers/gpio/pca9555.h @@ -0,0 +1,55 @@ +/* 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/>. + */ +#pragma once + +/* + PCA9555 + ,----------. + SDA --| SDA P00 |-- P00 + SCL --| SCL P01 |-- P01 + INT --| INT P02 |-- P02 + | P03 |-- P03 + A0 --| A0 P04 |-- P04 + A1 --| A1 P05 |-- P05 + A2 --| A2 P06 |-- P06 + | P07 |-- P07 + | | + | P10 |-- P10 + | P11 |-- P11 + | P12 |-- P12 + | P13 |-- P13 + | P14 |-- P14 + | P15 |-- P15 + | P16 |-- P16 + | P17 |-- P17 + `----------' +*/ + +#define PCA9555_PORT0 0 +#define PCA9555_PORT1 1 + +#define ALL_OUTPUT 0 +#define ALL_INPUT 0xFF +#define ALL_LOW 0 +#define ALL_HIGH 0xFF + +void pca9555_init(uint8_t slave_addr); + +void pca9555_set_config(uint8_t slave_addr, uint8_t port, uint8_t conf); + +void pca9555_set_output(uint8_t slave_addr, uint8_t port, uint8_t conf); + +uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port); |