diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpio/mcp23018.c | 108 | ||||
| -rw-r--r-- | drivers/gpio/mcp23018.h | 65 |
2 files changed, 173 insertions, 0 deletions
diff --git a/drivers/gpio/mcp23018.c b/drivers/gpio/mcp23018.c new file mode 100644 index 0000000000..dc8ab03c50 --- /dev/null +++ b/drivers/gpio/mcp23018.c @@ -0,0 +1,108 @@ +// 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; +} diff --git a/drivers/gpio/mcp23018.h b/drivers/gpio/mcp23018.h new file mode 100644 index 0000000000..e7c2730dd1 --- /dev/null +++ b/drivers/gpio/mcp23018.h @@ -0,0 +1,65 @@ +// Copyright 2022 zvecr<git@zvecr.com> +// SPDX-License-Identifier: GPL-2.0-or-later + +#pragma once + +#include <stdint.h> +#include <stdbool.h> + +/** + * Port ID + */ +typedef enum { + mcp23018_PORTA, + mcp23018_PORTB, +} mcp23018_port_t; + +/** + * Helpers for set_config + */ +enum { + ALL_OUTPUT = 0, + ALL_INPUT = 0xFF, +}; + +/** + * Helpers for set_output + */ +enum { + ALL_LOW = 0, + ALL_HIGH = 0xFF, +}; + +/** + * Init expander and any other dependent drivers + */ +void mcp23018_init(uint8_t slave_addr); + +/** + * Configure input/output to a given port + */ +bool mcp23018_set_config(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf); + +/** + * Write high/low to a given port + */ +bool mcp23018_set_output(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf); + +/** + * Write high/low to both ports sequentially + * + * - slightly faster than multiple set_output + */ +bool mcp23018_set_output_all(uint8_t slave_addr, uint8_t confA, uint8_t confB); + +/** + * Read state of a given port + */ +bool mcp23018_readPins(uint8_t slave_addr, mcp23018_port_t port, uint8_t* ret); + +/** + * Read state of both ports sequentially + * + * - slightly faster than multiple readPins + */ +bool mcp23018_readPins_all(uint8_t slave_addr, uint16_t* ret); |