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mcp23017
2018-12-17
Library to use MCP23017 I/O Expander chip with STM32 via i2c interface
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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
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(1)
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.