ALPINE M-BUS COMMUNICATION:
Audio Input activation- Alpine M-BUS is an 1-wire bus and half duplex transmssion. The line coding is unusual. It’s none of the textbook codes, instead some kind of pulse width modulation. A short low pulse (about 0.6 ms) is a binary zero, a longer pulse (about 1.8 ms) is a one. The distance between the pulses remains constant, about 3 ms. The resulting baud rate is about 325 baud, fairly slow.
- Audio Input of autoradio headunit can only be activated if headunit received an acknoledge of equipment link on headunit by M-BUS.
- It's also necessary to implement this response frame to activate audio input. Because of M-Bus caracteristics, i should use a PWM to generate frames on M-BUS.
I choose the Atmel ATTiny26 to realize this project.
With this controller, i can devellop more functionnalities for others applications linked with auto-radio head unit (Mp3 player directly drive with headunit for exemple)
Audio Input activation- Alpine M-BUS is an 1-wire bus and half duplex transmssion. The line coding is unusual. It’s none of the textbook codes, instead some kind of pulse width modulation. A short low pulse (about 0.6 ms) is a binary zero, a longer pulse (about 1.8 ms) is a one. The distance between the pulses remains constant, about 3 ms. The resulting baud rate is about 325 baud, fairly slow.
- Audio Input of autoradio headunit can only be activated if headunit received an acknoledge of equipment link on headunit by M-BUS.
- It's also necessary to implement this response frame to activate audio input. Because of M-Bus caracteristics, i should use a PWM to generate frames on M-BUS.
I choose the Atmel ATTiny26 to realize this project.
With this controller, i can devellop more functionnalities for others applications linked with auto-radio head unit (Mp3 player directly drive with headunit for exemple)