115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
// Copyright 2022 zvecr<git@zvecr.com>
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "mcp23018.h"
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#include "i2c_master.h"
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#include "wait.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_IODIRA = 0x00, // i/o direction register
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CMD_IODIRB = 0x01,
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CMD_GPPUA = 0x0C, // GPIO pull-up resistor register
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CMD_GPPUB = 0x0D,
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CMD_GPIOA = 0x12, // general purpose i/o port register (write modifies OLAT)
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CMD_GPIOB = 0x13,
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};
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bool mcp23018_init(uint8_t slave_addr) {
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static uint8_t s_init = 0;
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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if (0 == s_init) {
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i2c_init();
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wait_ms(100);
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// probe that the expander is actually connected by reading from it
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uint8_t data = 0;
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if (I2C_STATUS_SUCCESS == i2c_readReg(addr, 0, &data, sizeof(data), 150)) {
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s_init = 1;
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}
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}
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return (s_init > 0);
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}
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bool mcp23018_set_config(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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uint8_t cmdDirection = port ? CMD_IODIRB : CMD_IODIRA;
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uint8_t cmdPullup = port ? CMD_GPPUB : CMD_GPPUA;
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i2c_status_t ret = i2c_writeReg(addr, cmdDirection, &conf, sizeof(conf), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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dprintf("mcp23018_set_config::directionFAILED::%u\n", ret);
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return false;
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}
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ret = i2c_writeReg(addr, cmdPullup, &conf, sizeof(conf), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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dprintf("mcp23018_set_config::pullupFAILED::%u\n", ret);
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return false;
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}
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return true;
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}
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bool mcp23018_set_output(uint8_t slave_addr, mcp23018_port_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_GPIOB : CMD_GPIOA;
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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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dprintf("mcp23018_set_output::FAILED::%u\n", ret);
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return false;
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}
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return true;
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}
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bool mcp23018_set_output_all(uint8_t slave_addr, uint8_t confA, uint8_t confB) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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uint8_t conf[2] = {confA, confB};
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i2c_status_t ret = i2c_writeReg(addr, CMD_GPIOA, &conf[0], sizeof(conf), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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dprintf("mcp23018_set_output::FAILED::%u\n", ret);
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return false;
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}
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return true;
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}
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bool mcp23018_readPins(uint8_t slave_addr, mcp23018_port_t port, uint8_t* out) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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uint8_t cmd = port ? CMD_GPIOB : CMD_GPIOA;
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i2c_status_t ret = i2c_readReg(addr, cmd, out, sizeof(uint8_t), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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dprintf("mcp23018_readPins::FAILED::%u\n", ret);
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return false;
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}
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return true;
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}
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bool mcp23018_readPins_all(uint8_t slave_addr, uint16_t* out) {
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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 = {.u16 = 0};
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i2c_status_t ret = i2c_readReg(addr, CMD_GPIOA, &data.u8[0], sizeof(data), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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dprintf("mcp23018_readPins::FAILED::%u\n", ret);
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return false;
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}
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*out = data.u16;
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return true;
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}
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