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2018-12-17

Biblioteca para usar el chip de expansión de E/S MCP23017 con STM32 a través de la interfaz I2C

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MCP23017 library for STM32.

Library to use MCP23017 I/O Expander chip with STM32 via i2c interface.

       .---------.
GPB0<->|1  \_/ 28|<->GPA7
GPB1<->|         |<->GPA6
GPB2<->|    M    |<->GPA5
GPB3<->|    C    |<->GPA4
GPB4<->|    P    |<->GPA3
GPB5<->|    2    |<->GPA2
GPB6<->|    3    |<->GPA1
GPB7<->|    0    |<->GPA0
 VDD-->|    1    |-->INTA
 VSS-->|    7    |-->INTB
  NC---|         |-->~RESET
 SCL-->|         |<--A2
 SDA<->|         |<--A1
  NC---|14     15|<--A0
       '---------'

Example: Read bits from GPA then copy bits to GPB.

#include "mcp23017.h"

MCP23017_HandleTypeDef hmcp;

mcp23017_init(&hmcp, &hi2c1, MCP23017_ADDRESS_20); mcp23017_iodir(&hmcp, MCP23017_PORTA, MCP23017_IODIR_ALL_INPUT); mcp23017_iodir(&hmcp, MCP23017_PORTB, MCP23017_IODIR_ALL_OUTPUT);

while (1) { mcp23017_read_gpio(&hmcp, MCP23017_PORTA); hmcp.gpio[MCP23017_PORTB] = hmcp.gpio[MCP23017_PORTA]; mcp23017_write_gpio(&hmcp, MCP23017_PORTB); }

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  • Reviews

    1 (1)
    Avatar
    user_FoSoqlxk
    2025-04-18

    I've been using the mcp23017 and it's been phenomenal for expanding my I/O capabilities. Ruda has done an excellent job with this product, making it straightforward to integrate into various projects. The documentation on GitHub is clear and comprehensive, which really helps in getting started quickly. Highly recommend it for anyone looking to enhance their microcontroller projects.