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- refactor constructor interface - breaking changes. - minimize conditional code. -- create SPI_CLASS macro to solve it. - update readme.md - update examples
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examples/MCP23S17_four_ADDRESS_array/MCP23S17_four_ADDRESS_array.ino
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| // | ||
| // FILE: MCP23S17_four_ADDRESS_array.ino | ||
| // AUTHOR: Rob Tillaart | ||
| // PURPOSE: demo two MCP23S17 devices | ||
| // URL: https://github.com/RobTillaart/MCP23S17 | ||
| // | ||
| // #27, experimental, not tested with hardware yet | ||
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| #include "MCP23S17.h" | ||
| #include "SPI.h" | ||
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| MCP23S17 MCP_A(10, 12, 11, 13, 0); // SW SPI, address 0 | ||
| MCP23S17 MCP_B(10, 12, 11, 13, 1); // SW SPI, address 1 | ||
| MCP23S17 MCP_C(10, 12, 11, 13, 2); // SW SPI, address 2 | ||
| MCP23S17 MCP_D(10, 12, 11, 13, 3); // SW SPI, address 3 | ||
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| // MCP23S17 MCP_A(10, 0); // HW SPI, address 0 | ||
| // MCP23S17 MCP_B(10, 1); // HW SPI, address 1 | ||
| // MCP23S17 MCP_C(10, 2); // HW SPI, address 2 | ||
| // MCP23S17 MCP_D(10, 3); // HW SPI, address 3 | ||
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| MCP23S17 MCP[4] = { MCP_A, MCP_B, MCP_C, MCP_D }; | ||
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| void setup() | ||
| { | ||
| Serial.begin(115200); | ||
| Serial.println(); | ||
| Serial.print("MCP23S17_LIB_VERSION: "); | ||
| Serial.println(MCP23S17_LIB_VERSION); | ||
| Serial.println(); | ||
| delay(100); | ||
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| SPI.begin(); | ||
| for (int addr = 0; addr < 4; addr++) | ||
| { | ||
| MCP[addr].begin(); | ||
| MCP[addr].enableHardwareAddress(); | ||
| } | ||
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| // test connected | ||
| for (int addr = 0; addr < 4; addr++) | ||
| { | ||
| Serial.print(addr); | ||
| Serial.print("\t"); | ||
| Serial.println(testConnection(MCP[addr])); | ||
| } | ||
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| // set all pins OUTPUT => LOW | ||
| for (int addr = 0; addr < 4; addr++) | ||
| { | ||
| MCP[addr].pinMode16(0); | ||
| MCP[addr].write16(0x0000); | ||
| } | ||
| } | ||
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| void loop() | ||
| { | ||
| int pin = random(64); | ||
| int addr = random(4); | ||
| MCP[addr].digitalWrite(pin, HIGH); | ||
| delay(100); | ||
| MCP[addr].digitalWrite(pin, LOW); | ||
| delay(100); | ||
| } | ||
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| // | ||
| // the connection test tries to write a magic number to a register | ||
| // and read it back. If it is the same it is assumed to be connected | ||
| // | ||
| int testConnection(MCP23S17 & mcp) | ||
| { | ||
| uint16_t magic_test_number = 0xABCD; | ||
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| // Read the current polarity config to restore later | ||
| uint16_t old_value; | ||
| if (! mcp.getPolarity16(old_value)) return -1; | ||
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| // Write the magic number to polarity register | ||
| if (! mcp.setPolarity16(magic_test_number)) return -2; | ||
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| // Read back the magic number from polarity register | ||
| uint16_t temp; | ||
| if (! mcp.getPolarity16(temp)) return -3; | ||
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| // Write old config to polarity register | ||
| if (! mcp.setPolarity16(old_value)) return -4; | ||
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| // Check the magic connection test | ||
| if (temp != magic_test_number) return -5; | ||
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| return 0; // OK | ||
| } | ||
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| // -- END OF FILE -- |
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