예제 #1
0
// TODO: send using interrupt if available
uint8_t ps2_host_send(uint8_t data)
{
    uint8_t res = 0;
    bool parity = true;
    ps2_error = PS2_ERR_NONE;
#ifdef PS2_USE_INT
    PS2_INT_OFF();
#endif
    /* terminate a transmission if we have */
    inhibit();
    _delay_us(200); // at least 100us

    /* start bit [1] */
    data_lo();
    clock_hi();
    WAIT(clock_lo, 20000, 10);   // may take 15ms at most until device starts clocking
    /* data [2-9] */
    for (uint8_t i = 0; i < 8; i++) {
        _delay_us(15);
        if (data&(1<<i)) {
            parity = !parity;
            data_hi();
        } else {
            data_lo();
        }
        WAIT(clock_hi, 50, 2);
        WAIT(clock_lo, 50, 3);
    }
    /* parity [10] */
    _delay_us(15);
    if (parity) { data_hi(); } else { data_lo(); }
    WAIT(clock_hi, 50, 4);
    WAIT(clock_lo, 50, 5);
    /* stop bit [11] */
    _delay_us(15);
    data_hi();
    /* ack [12] */
    WAIT(data_lo, 50, 6);
    WAIT(clock_lo, 50, 7);

    /* wait for idle state */
    WAIT(clock_hi, 50, 8);
    WAIT(data_hi, 50, 9);

#ifdef PS2_USE_INT
    PS2_INT_ON();
#endif
    res = ps2_host_recv_response();
ERROR:
#ifdef PS2_USE_INT
    PS2_INT_ON();
    idle();
#else
    inhibit();
#endif
    return res;
}
예제 #2
0
uint8_t ps2_host_send(uint8_t data)
{
    bool parity = true;
    ps2_error = PS2_ERR_NONE;

    PS2_USART_OFF();

    /* terminate a transmission if we have */
    inhibit();
    _delay_us(100); // [4]p.13

    /* 'Request to Send' and Start bit */
    data_lo();
    clock_hi();
    WAIT(clock_lo, 10000, 10);   // 10ms [5]p.50

    /* Data bit[2-9] */
    for (uint8_t i = 0; i < 8; i++) {
        _delay_us(15);
        if (data&(1<<i)) {
            parity = !parity;
            data_hi();
        } else {
            data_lo();
        }
        WAIT(clock_hi, 50, 2);
        WAIT(clock_lo, 50, 3);
    }

    /* Parity bit */
    _delay_us(15);
    if (parity) { data_hi(); } else { data_lo(); }
    WAIT(clock_hi, 50, 4);
    WAIT(clock_lo, 50, 5);

    /* Stop bit */
    _delay_us(15);
    data_hi();

    /* Ack */
    WAIT(data_lo, 50, 6);
    WAIT(clock_lo, 50, 7);

    /* wait for idle state */
    WAIT(clock_hi, 50, 8);
    WAIT(data_hi, 50, 9);

    idle();
    PS2_USART_INIT();
    PS2_USART_RX_INT_ON();
    return ps2_host_recv_response();
ERROR:
    idle();
    PS2_USART_INIT();
    PS2_USART_RX_INT_ON();
    return 0;
}
예제 #3
0
/*
Host to Keyboard
----------------
Data bits are LSB first and Parity is odd. Clock has around 60us high and 30us low part.

        ____        __   __   __   __   __   __   __   __   __   ________
Clock       \______/  \_/  \_/  \_/  \_/  \_/  \_/  \_/  \_/  \_/
            ^   ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ___
Data    ____|__/    X____X____X____X____X____X____X____X____X____X   \___
            |  Start   0    1    2    3    4    5    6    7    P   Stop
            Request by host

Start bit:  can be long as 300-350us.
Request:    Host pulls Clock line down to request to send a command.
Timing:     After Request keyboard pull up Data and down Clock line to low for start bit.
            After request host release Clock line once Data line becomes hi.
            Host writes a bit while Clock is hi and Keyboard reads while low.
Stop bit:   Host releases or pulls up Data line to hi after 9th clock and waits for keyboard pull down the line to lo.
*/
uint8_t ibm4704_send(uint8_t data)
{
    bool parity = true; // odd parity
    ibm4704_error = 0;

    IBM4704_INT_OFF();

    /* Request to send */
    idle();
    clock_lo();

    /* wait for Start bit(Clock:lo/Data:hi) */
    WAIT(data_hi, 300, 0x30);

    /* Data bit */
    for (uint8_t i = 0; i < 8; i++) {
        WAIT(clock_hi, 100, 0x40+i);
        if (data&(1<<i)) {
            parity = !parity;
            data_hi();
        } else {
            data_lo();
        }
        WAIT(clock_lo, 100, 0x48+i);
    }

    /* Parity bit */
    WAIT(clock_hi, 100, 0x34);
    if (parity) { data_hi(); } else { data_lo(); }
    WAIT(clock_lo, 100, 0x35);

    /* Stop bit */
    WAIT(clock_hi, 100, 0x34);
    data_hi();

    /* End */
    WAIT(data_lo, 100, 0x36);

    idle();
    IBM4704_INT_ON();
    return 0;
ERROR:
    idle();
    if (ibm4704_error > 0x30) {
        xprintf("S:%02X ", ibm4704_error);
    }
    IBM4704_INT_ON();
    return -1;
}
예제 #4
0
파일: m0110.c 프로젝트: mihow/tmk_keyboard
uint8_t m0110_send(uint8_t data)
{
    m0110_error = 0;

    request();
    WAIT_MS(clock_lo, 250, 1);  // keyboard may block long time
    for (uint8_t bit = 0x80; bit; bit >>= 1) {
        WAIT_US(clock_lo, 250, 3);
        if (data&bit) {
            data_hi();
        } else {
            data_lo();
        }
        WAIT_US(clock_hi, 200, 4);
    }
    _delay_us(100); // hold last bit for 80us
    idle();
    return 1;
ERROR:
    print("m0110_send err: "); phex(m0110_error); print("\n");
    _delay_ms(500);
    idle();
    return 0;
}
예제 #5
0
파일: m0110.c 프로젝트: mihow/tmk_keyboard
static inline void idle(void)
{
    clock_hi();
    data_hi();
}
예제 #6
0
/* inhibit device to send */
static inline void inhibit(void)
{
    clock_lo();
    data_hi();
}