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qmk_firmware

custom branch of QMK firmware git clone https://anongit.hacktivis.me/git/qmk_firmware.git

mcp23018.c (2002B)

    

  1. /*
  2.  * Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
  3.  * Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
  4.  *
  5.  * This program is free software: you can redistribute it and/or modify
  6.  * it under the terms of the GNU General Public License as published by
  7.  * the Free Software Foundation, either version 2 of the License, or
  8.  * (at your option) any later version.
  9.  *
  10.  * This program is distributed in the hope that it will be useful,
  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13.  * GNU General Public License for more details.
  14.  *
  15.  * You should have received a copy of the GNU General Public License
  16.  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17.  */
  19. #include "i2c_master.h"
  20. #include "mcp23018.h"
  22. #define MCP23018_ADDR 0b0100000
  24. #define MCP23018_TIMEOUT 100
  26. static i2c_status_t mcp23018_status = I2C_STATUS_ERROR;
  28. void msp23018_init(void) {
  29.     mcp23018_status = I2C_STATUS_SUCCESS;
  31.     // Set pin direction
  32.     uint8_t iodir[] = {0b00001111, 0b11111111};
  33.     mcp23018_writeReg(IODIRA, iodir, 2);
  35.     // Set pull-up
  36.     uint8_t gppu[] = {0b00001111, 0b11111000};
  37.     mcp23018_writeReg(GPPUA, gppu, 2);
  39.     // LEDs output high
  40.     uint8_t gpio[] = {0b00000000, 0b00000111};
  41.     mcp23018_writeReg(GPIOA, gpio, 2);
  42. }
  44. bool mcp23018_reset_required(void) { return mcp23018_status != I2C_STATUS_SUCCESS; }
  46. i2c_status_t mcp23018_writeReg(uint8_t regaddr, const uint8_t* data, uint16_t length) {
  47.     if (mcp23018_status) {
  48.         return mcp23018_status;
  49.     }
  51.     mcp23018_status = i2c_write_register((MCP23018_ADDR << 1), regaddr, data, length, MCP23018_TIMEOUT);
  52.     return mcp23018_status;
  53. }
  55. i2c_status_t mcp23018_readReg(uint8_t regaddr, uint8_t* data, uint16_t length) {
  56.     if (mcp23018_status) {
  57.         return mcp23018_status;
  58.     }
  60.     mcp23018_status = i2c_read_register((MCP23018_ADDR << 1), regaddr, data, length, MCP23018_TIMEOUT);
  61.     return mcp23018_status;
  62. }