Вызов мастера в I2C чип LPC2131 Опции

[Папа Карло]

Всем привет!

Настраиваю I2C между 2 устройствами на чипах LPC2131.
Один мастер, а другой ведомый.

Как ведомому сообщить мастеру, что у него есть информация важная ?

Чипы соединены только по I2C и других проводов протянуть нельзя.

[Папа Карло]

Осциллографа нет.
Могу выложить код ведомого:

Код

    case 0xA8://own SLA+R received, ACK returned (slave transmitter)
    case 0xB8://Data transmitted, ACK received
        if(i2c_size--)                  // if not last data byte transmitted
            {
            I2C0DAT = *i2c_data++;      // send next data byte
            I2C0CONSET = 0x04;//
            }
        else
            {
            I2C0CONCLR = 0x04;//
            i2c_stat   = 0;             //
            i2c_size = 0;
            }  
        break;
    case 0xC8://Last data transmitted, ACK received
        I2C0CONCLR = 0x04;//
        break;

Код ведущего:

Код

        case 0x50:
            *i2c_data++ = I2C0DAT;                  //
            i2c_read = 1;
            if(--i2c_size)                          // if not last data byte received
            {
                I2C0CONSET = 0x04;                  // set ACK bit
                I2C0CONCLR = 0x10;                  // clear "STOP" state
                   I2C0CONCLR = 0x20;                  // clear "START" state
            }
            else
            {    
                I2C0CONCLR = 0x04;                  // reset ACK bit
                I2C0CONCLR = 0x10;                  // clear "STOP" state
                   I2C0CONCLR = 0x20;                  // clear "START" state
                i2c_stat   = 0;                     // send transfer end flag
            }
            break;
        case 0x58:                                  // slave address and RD bit transmitted. ACK not received. Data read.
            I2C0CONSET = 0x10;                      // send "STOP" state
            I2C0CONCLR = 0x20;                      // clear "START/RESTART" state
            i2c_stat   = 0;                         // send transfer flag
            break;