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-rw-r--r--drivers/gpio/mcp23018.c108
-rw-r--r--drivers/gpio/mcp23018.h65
-rw-r--r--drivers/gpio/sn74x138.c65
-rw-r--r--drivers/gpio/sn74x138.h48
4 files changed, 286 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);
diff --git a/drivers/gpio/sn74x138.c b/drivers/gpio/sn74x138.c
new file mode 100644
index 0000000000..222e5db56c
--- /dev/null
+++ b/drivers/gpio/sn74x138.c
@@ -0,0 +1,65 @@
+/* Copyright 2022
+ *
+ * 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 "sn74x138.h"
+#include "gpio.h"
+
+#define ADDRESS_PIN_COUNT 3
+
+#ifndef SN74X138_ADDRESS_PINS
+# error sn74x138: no address pins defined!
+#endif
+
+static const pin_t address_pins[ADDRESS_PIN_COUNT] = SN74X138_ADDRESS_PINS;
+
+void sn74x138_init(void) {
+ for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
+ setPinOutput(address_pins[i]);
+ writePinLow(address_pins[i]);
+ }
+
+#if defined(SN74X138_E1_PIN)
+ setPinOutput(SN74X138_E1_PIN);
+ writePinHigh(SN74X138_E1_PIN);
+#endif
+
+#if defined(SN74X138_E2_PIN)
+ setPinOutput(SN74X138_E2_PIN);
+ writePinHigh(SN74X138_E2_PIN);
+#endif
+#if defined(SN74X138_E3_PIN)
+ setPinOutput(SN74X138_E3_PIN);
+ writePinLow(SN74X138_E3_PIN);
+#endif
+}
+
+void sn74x138_set_enabled(bool enabled) {
+#if defined(SN74X138_E1_PIN)
+ writePin(SN74X138_E1_PIN, !enabled);
+#endif
+#if defined(SN74X138_E2_PIN)
+ writePin(SN74X138_E2_PIN, !enabled);
+#endif
+#if defined(SN74X138_E3_PIN)
+ writePin(SN74X138_E3_PIN, enabled);
+#endif
+}
+
+void sn74x138_set_addr(uint8_t address) {
+ for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
+ writePin(address_pins[i], address & (1 << i));
+ }
+}
diff --git a/drivers/gpio/sn74x138.h b/drivers/gpio/sn74x138.h
new file mode 100644
index 0000000000..6f1f20e618
--- /dev/null
+++ b/drivers/gpio/sn74x138.h
@@ -0,0 +1,48 @@
+/* Copyright 2022
+ *
+ * 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
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**
+ * Driver for 74x138 3-to-8 decoder/demultiplexer with inverting outputs
+ * https://assets.nexperia.com/documents/data-sheet/74HC_HCT138.pdf
+ */
+
+/**
+ * Initialize the address and output enable pins.
+ */
+void sn74x138_init(void);
+
+/**
+ * Set the enabled state.
+ *
+ * When enabled is true, pulls the E1 and E2 pins low, and the E3 pin high.
+ *
+ * \param enabled The enable state to set.
+ */
+void sn74x138_set_enabled(bool enabled);
+
+/**
+ * Set the output pin address.
+ *
+ * The selected output pin will be pulled low, while the remaining output pins will be high.
+ *
+ * \param address The address to set, from 0 to 7.
+ */
+void sn74x138_set_addr(uint8_t address);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-20 17:08:51 +0000