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- // Copyright 2022 zvecr<git@zvecr.com>
- // SPDX-License-Identifier: GPL-2.0-or-later
-
- #include "mcp23018.h"
- #include "i2c_master.h"
- #include "wait.h"
- #include "debug.h"
-
- #define SLAVE_TO_ADDR(n) (n << 1)
- #define TIMEOUT 100
-
- enum {
- CMD_IODIRA = 0x00, // i/o direction register
- CMD_IODIRB = 0x01,
- CMD_GPPUA = 0x0C, // GPIO pull-up resistor register
- CMD_GPPUB = 0x0D,
- CMD_GPIOA = 0x12, // general purpose i/o port register (write modifies OLAT)
- CMD_GPIOB = 0x13,
- };
-
- void mcp23018_init(uint8_t addr) {
- static uint8_t s_init = 0;
- if (!s_init) {
- i2c_init();
- wait_ms(1000);
-
- s_init = 1;
- }
- }
-
- bool mcp23018_set_config(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf) {
- uint8_t addr = SLAVE_TO_ADDR(slave_addr);
- uint8_t cmdDirection = port ? CMD_IODIRB : CMD_IODIRA;
- uint8_t cmdPullup = port ? CMD_GPPUB : CMD_GPPUA;
-
- i2c_status_t ret = i2c_writeReg(addr, cmdDirection, &conf, sizeof(conf), TIMEOUT);
- if (ret != I2C_STATUS_SUCCESS) {
- dprintf("mcp23018_set_config::directionFAILED::%u\n", ret);
- return false;
- }
-
- ret = i2c_writeReg(addr, cmdPullup, &conf, sizeof(conf), TIMEOUT);
- if (ret != I2C_STATUS_SUCCESS) {
- dprintf("mcp23018_set_config::pullupFAILED::%u\n", ret);
- return false;
- }
-
- return true;
- }
-
- bool mcp23018_set_output(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf) {
- uint8_t addr = SLAVE_TO_ADDR(slave_addr);
- uint8_t cmd = port ? CMD_GPIOB : CMD_GPIOA;
-
- i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
- if (ret != I2C_STATUS_SUCCESS) {
- dprintf("mcp23018_set_output::FAILED::%u\n", ret);
- return false;
- }
-
- return true;
- }
-
- bool mcp23018_set_output_all(uint8_t slave_addr, uint8_t confA, uint8_t confB) {
- uint8_t addr = SLAVE_TO_ADDR(slave_addr);
- uint8_t conf[2] = {confA, confB};
-
- i2c_status_t ret = i2c_writeReg(addr, CMD_GPIOA, &conf[0], sizeof(conf), TIMEOUT);
- if (ret != I2C_STATUS_SUCCESS) {
- dprintf("mcp23018_set_output::FAILED::%u\n", ret);
- return false;
- }
-
- return true;
- }
-
- bool mcp23018_readPins(uint8_t slave_addr, mcp23018_port_t port, uint8_t* out) {
- uint8_t addr = SLAVE_TO_ADDR(slave_addr);
- uint8_t cmd = port ? CMD_GPIOB : CMD_GPIOA;
-
- i2c_status_t ret = i2c_readReg(addr, cmd, out, sizeof(uint8_t), TIMEOUT);
- if (ret != I2C_STATUS_SUCCESS) {
- dprintf("mcp23018_readPins::FAILED::%u\n", ret);
- return false;
- }
-
- return true;
- }
-
- bool mcp23018_readPins_all(uint8_t slave_addr, uint16_t* out) {
- uint8_t addr = SLAVE_TO_ADDR(slave_addr);
-
- typedef union {
- uint8_t u8[2];
- uint16_t u16;
- } data16;
-
- data16 data = {.u16 = 0};
-
- i2c_status_t ret = i2c_readReg(addr, CMD_GPIOA, &data.u8[0], sizeof(data), TIMEOUT);
- if (ret != I2C_STATUS_SUCCESS) {
- dprintf("mcp23018_readPins::FAILED::%u\n", ret);
- return false;
- }
-
- *out = data.u16;
- return true;
- }
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