| 0,0 → 1,77 |
|---|
| #include <OneWire.h> |
| |
| /* |
| * DS2408 8-Channel Addressable Switch |
| * |
| * Writte by Glenn Trewitt, glenn at trewitt dot org |
| * |
| * Some notes about the DS2408: |
| * - Unlike most input/output ports, the DS2408 doesn't have mode bits to |
| * set whether the pins are input or output. If you issue a read command, |
| * they're inputs. If you write to them, they're outputs. |
| * - For reading from a switch, you should use 10K pull-up resisters. |
| */ |
| |
| void PrintBytes(uint8_t* addr, uint8_t count, bool newline=0) { |
| for (uint8_t i = 0; i < count; i++) { |
| Serial.print(addr[i]>>4, HEX); |
| Serial.print(addr[i]&0x0f, HEX); |
| } |
| if (newline) |
| Serial.println(); |
| } |
| |
| void ReadAndReport(OneWire* net, uint8_t* addr) { |
| Serial.print(" Reading DS2408 "); |
| PrintBytes(addr, 8); |
| Serial.println(); |
| |
| uint8_t buf[13]; // Put everything in the buffer so we can compute CRC easily. |
| buf[0] = 0xF0; // Read PIO Registers |
| buf[1] = 0x88; // LSB address |
| buf[2] = 0x00; // MSB address |
| net->write_bytes(buf, 3); |
| net->read_bytes(buf+3, 10); // 3 cmd bytes, 6 data bytes, 2 0xFF, 2 CRC16 |
| net->reset(); |
| |
| if (!OneWire::check_crc16(buf, 11, &buf[11])) { |
| Serial.print("CRC failure in DS2408 at "); |
| PrintBytes(addr, 8, true); |
| return; |
| } |
| Serial.print(" DS2408 data = "); |
| // First 3 bytes contain command, register address. |
| Serial.println(buf[3], BIN); |
| } |
| |
| OneWire net(10); // on pin 10 |
| |
| void setup(void) { |
| Serial.begin(9600); |
| } |
| |
| void loop(void) { |
| byte i; |
| byte present = 0; |
| byte addr[8]; |
| |
| if (!net.search(addr)) { |
| Serial.print("No more addresses.\n"); |
| net.reset_search(); |
| delay(1000); |
| return; |
| } |
| |
| if (OneWire::crc8(addr, 7) != addr[7]) { |
| Serial.print("CRC is not valid!\n"); |
| return; |
| } |
| |
| if (addr[0] != 0x29) { |
| PrintBytes(addr, 8); |
| Serial.print(" is not a DS2408.\n"); |
| return; |
| } |
| |
| ReadAndReport(&net, addr); |
| } |