NC CAN data

[BeerMoneyMotorsports]

NC dash(and chassis) CAN broadcasts from fome to support dash, abs, prht, etc.

https://github.com/hatsunearu/nc-mx5-miata-canbus/blob/main/mazda_mx5_nc.md

[BeerMoneyMotorsports]

struct nc_cluster {
//lamps
boolean Securitylamp; //
boolean DCSlamp; // 0x212, byte0, 0x08
uint8_t ABSlamp; // 0x212, byte4, 0x10 on 0x20 flashing
boolean Brakelamp; // 0x212, byte4, 0x40
uint8_t TCSlamp; // 0x212, byte4, 0x04 on 0x08 flashing
uint8_t MILlamp; // 0x420, byte5, 0x40 on 0x80 flashing
boolean Battlamp; // 0x420, byte6, 0x40 on
uint8_t Cruiselamp; // 0x4EC, byte0, 0x40 green 0x80 amber
//gauges
uint16_t Tach; // 0x201, byte0
uint8_t TachoIndex;
uint16_t Speedo; // 0x201, byte4
uint8_t OdoDist; // Distance calculated from speed.
uint8_t Odometer; // 0x420, byte 1, 0x3F (63) maximum single increase
uint16_t OdoFollow; // check for rollover
uint8_t OdoAdd; // rollover placeholder.
boolean Oilpressure; // oil is sadly a PSI switch, dedicated pin
uint8_t Coolant; // 0x420, byte 0
//transmission
uint8_t PRNDL; // 0x231, byte 0
uint8_t Gear; //0x231, byte 7 1-6, only displays if PRNDL = Drive or Manual
uint8_t LastPRNDL;
};

//packet intervals in ms
#define interval201 10
#define interval212 100
#define interval231 25
#define interval420 100
#define interval4FF 100
#define interval4F0 1000
#define interval4F1 1000
#define interval211 10;
#define interval218 25;

void send218frame() {
Frame packet;

packet.id = 0x218;
packet.eid = 0;
packet.dlc = 8;

//0F A0 7C 80 FF FF FF 00

packet.data[0] = 0x0F;
packet.data[1] = 0xA0;
packet.data[2] = 0x7C;
packet.data[3] = 0x80;
packet.data[4] = 0xFF;
packet.data[5] = 0xFF; //(0xFF & random(255));
packet.data[6] = 0xFF; //(0xFF & random(255));
packet.data[7] = 0x00; //(0xFF & random(255));

Mazda.txPacket(packet);
}

/*
PRHT Auto Observations
231#0100FFFF00000000 - Park
231#1000015700000001 - Nothing?
231#E20001320000000E - Reverse
231#0300FFFF00000000 - Neutral
231#1400015700000001 - Drive (1)

 FF 04 FF FF 00 00 00 00 PRHT operation (manual transmission)

*/

PRHT requires 231 packet (that contains gear information), 201 packet (speed), 218(?) whose function i'm not 100% sure of, 4F0(?) that appears to be a static message of
4F0#14 40 12 30 03 00 00 00, 4F1 that is 4F1#81 01 9A FF FF 00 59 59 for manual transmission, 4F1#8B 01 9A FF FF 00 58 58 for auto transmission, 4FF that is a repeating 5 element message of..
/*
0 11,00,00,00,00,00,00,00,
1 30,44,49,53,41,42,00,00,
2 31,4C,45,56,49,4E,43,00,
3 32,4F,4D,50,41,52,45,00,
4 10,14,24,12,FF,00,00,00,
*/

231 is.. a bit messy here, since this (i think) ties into the fuel anti-slosh..

void send231frame() {
Frame packet;

if (currenttime > next_fuel_slosh) {
switch (fuel_slosher) {
case 0x00:
fuel_slosher = 0x02;
next_fuel_slosh = currenttime + 30000; //0x02 for 30 seconds
break;
case 0x02:
fuel_slosher = 0x06;
next_fuel_slosh = currenttime + 5000; //0x06 for 5 seconds
break;
case 0x06:
fuel_slosher = 0x00;
next_fuel_slosh = currenttime + 60000; //0x00 for 60 seconds
break;
}
}

packet.id = 0x231;
packet.eid = 0;
packet.dlc = 8;

if (TRANS_version > tT56) {
if (cluster.PRNDL == park) {
//231#01 00 FF FF 00 00 00 00 - Park
packet.data[0] = 0x01;
packet.data[1] = fuel_slosher;
packet.data[2] = 0xFF;
packet.data[3] = 0xFF;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = 0x00;
}
if (cluster.PRNDL == reverse) {
//231#E2 00 01 32 00 00 00 0E - Reverse
packet.data[0] = 0xE2;
packet.data[1] = fuel_slosher;
packet.data[2] = 0x01;
packet.data[3] = 0x32;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = 0x0E;
}
if (cluster.PRNDL == neutral) {
//231#03 00 FF FF 00 00 00 00 - Neutral
packet.data[0] = 0x03;
packet.data[1] = fuel_slosher;
packet.data[2] = 0xFF;
packet.data[3] = 0xFF;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = 0x00;
}
if (cluster.PRNDL == drive) {
//231#14 00 01 57 00 00 00 01 - Drive (1)
packet.data[0] = 0x14;
packet.data[1] = fuel_slosher;
packet.data[2] = 0x01;
packet.data[3] = 0x57;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = 0x00; //option display gear here?
}
if (cluster.PRNDL == manual) {
packet.data[0] = 0x04;
packet.data[1] = fuel_slosher + 0x80;
packet.data[2] = 0xFF;
packet.data[3] = 0xFF;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = cluster.Gear;
}
//shouldn't proc normally - only for menu/communication lost
if (cluster.PRNDL == ATicon) {
packet.data[0] = 0x10;
packet.data[1] = fuel_slosher + 0x40;
//packet.data[0] = 0x04;
//packet.data[1] = 0x40;
packet.data[2] = 0x01;
packet.data[3] = 0x57;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = 0x01;
}
if (cluster.PRNDL == none) {
//10 00 01 57 00 00 00 01
packet.data[0] = 0x10;
packet.data[1] = fuel_slosher;
packet.data[2] = 0x01;
packet.data[3] = 0x57;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = 0x01;
}
if (cluster.PRNDL != cluster.LastPRNDL) {
//inter-gear change packet - for PRHT operability, should only care about P and D, don't need to track gears
//231#10 00 01 57 00 00 00 01 - Nothing?
packet.data[0] = 0x10;
packet.data[1] = fuel_slosher;
packet.data[2] = 0x01;
packet.data[3] = 0x57;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = 0x01;
}
} // end if trans > tt56

if (TRANS_version == tT56) {
//FF 04 FF FF 00 00 00 00 PRHT operation (manual transmission)

/*
      368 231#FF00FFFF00000000
       21 231#FF02FFFF00000000
     6726 231#FF04FFFF00000000
      113 231#FF06FFFF00000000

      0x04 = hung up on 5/8ths
      0x00 = start 9:05 1/2 9:28 3t above e 9:51
      0x02 = start 9:52 hung at 5/8
      0x06 = start 11:30 hung at 5/8
      0x00 = start 12:55 hung at 5/8 (disabled 39a)
      0x00 = start 1:35
*/
//packet.data[1] = 0x04;

packet.data[0] = 0xFF;
packet.data[1] = fuel_slosher;
packet.data[2] = 0xFF;
packet.data[3] = 0xFF;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = 0x00;

}

cluster.LastPRNDL = cluster.PRNDL;

Mazda.txPacket(packet);
}

212 packet is produced by the ABS module. I don't have it called out explicitely in my notes, but I think it's enabled by the 4Fx packets. The ECU reads the steering angle sensor and broadcasts that to the ABS module for
traction control - I have the steering sweep saved somewhere, but not in my notes.

Security - you can short circuit (sorta) the Security lamp on the cluster - it's a challenge/hash response/ack workflow, but you can shortcut by sending the ack packet within 10ms(?) of cluster power on.

void turnoffsecurity() {
Frame packet;

//040#81 7F 00 00 00 00 00 00

packet.id = 0x040;
packet.eid = 0;
packet.dlc = 8;
packet.data[0] = 0x81;
packet.data[1] = 0x7F;
packet.data[2] = 0x00;
packet.data[3] = 0x00;
packet.data[4] = 0x00;
packet.data[5] = 0x00;
packet.data[6] = 0x00;
packet.data[7] = 0x00;

Mazda.txPacket(packet);
}

void send211frame() {
Frame packet;
//generated by cluster on auth?
//no 211 packet on automatic PRHT?
// FF,FF,80,0,40,0,0,

packet.id = 0x211;
packet.eid = 0;
packet.dlc = 8;
packet.data[0] = 0xFF;
packet.data[1] = 0xFF;
packet.data[2] = 0x80;
packet.data[3] = 0x00;
packet.data[4] = 0x40;
packet.data[5] = 0x00; //(0xFF & random(255));
packet.data[6] = 0x00; //(0xFF & random(255));
packet.data[7] = c211data; //(0xFF & random(255));

c211data++;

Mazda.txPacket(packet);
}
mostly static, but last data always increases

[BeerMoneyMotorsports]

rx8 preset runs the tach, oil pressure and coolant gauges. It can be copied and then delete the 0x212 portion as that will conflict with the ABS broadcast.