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74 lines
1.8 KiB
74 lines
1.8 KiB
#include <OneWire.h>
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/*
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* DS2408 8-Channel Addressable Switch
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*
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* Writte by Glenn Trewitt, glenn at trewitt dot org
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*
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* Some notes about the DS2408:
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* - Unlike most input/output ports, the DS2408 doesn't have mode bits to
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* set whether the pins are input or output. If you issue a read command,
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* they're inputs. If you write to them, they're outputs.
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* - For reading from a switch, you should use 10K pull-up resisters.
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*/
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OneWire net(10); // on pin 10
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void PrintBytes(const uint8_t* addr, uint8_t count, bool newline=false) {
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for (uint8_t i = 0; i < count; i++) {
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Serial.print(addr[i]>>4, HEX);
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Serial.print(addr[i]&0x0f, HEX);
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}
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if (newline)
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Serial.println();
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}
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void setup(void) {
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Serial.begin(9600);
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}
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void loop(void) {
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byte addr[8];
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if (!net.search(addr)) {
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Serial.print("No more addresses.\n");
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net.reset_search();
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delay(1000);
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return;
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}
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if (OneWire::crc8(addr, 7) != addr[7]) {
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Serial.print("CRC is not valid!\n");
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return;
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}
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if (addr[0] != 0x29) {
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PrintBytes(addr, 8);
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Serial.print(" is not a DS2408.\n");
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return;
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}
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Serial.print(" Reading DS2408 ");
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PrintBytes(addr, 8);
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Serial.println();
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uint8_t buf[13]; // Put everything in the buffer so we can compute CRC easily.
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buf[0] = 0xF0; // Read PIO Registers
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buf[1] = 0x88; // LSB address
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buf[2] = 0x00; // MSB address
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net.write_bytes(buf, 3);
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net.read_bytes(buf+3, 10); // 3 cmd bytes, 6 data bytes, 2 0xFF, 2 CRC16
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net.reset();
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if (!OneWire::check_crc16(buf, 11, &buf[11])) {
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Serial.print("CRC failure in DS2408 at ");
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PrintBytes(addr, 8, true);
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return;
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}
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Serial.print(" DS2408 data = ");
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// First 3 bytes contain command, register address.
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Serial.println(buf[3], BIN);
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}
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