void ps2_mouse_init_user() {
uint8_t rcv;
// set TrackPoint sensitivity
PS2_MOUSE_SEND(0xE2, "tpsens: 0xE2");
PS2_MOUSE_SEND(0x81, "tpsens: 0x81");
PS2_MOUSE_SEND(0x4A, "tpsens: 0x4A");
PS2_MOUSE_SEND(0x49, "tpsens: 0x59");
// set TrackPoint Negative Inertia factor
PS2_MOUSE_SEND(0xE2, "tpnegin: 0xE2");
PS2_MOUSE_SEND(0x81, "tpnegin: 0x81");
PS2_MOUSE_SEND(0x4D, "tpnegin: 0x4D");
PS2_MOUSE_SEND(0x06, "tpnegin: 0x06");
// set TrackPoint speed
// (transfer function upper plateau speed)
PS2_MOUSE_SEND(0xE2, "tpsp: 0xE2");
PS2_MOUSE_SEND(0x81, "tpsp: 0x81");
PS2_MOUSE_SEND(0x60, "tpsp: 0x60");
PS2_MOUSE_SEND(0x61, "tpsp: 0x61");
// inquire pts status
rcv = ps2_host_send(0xE2);
rcv = ps2_host_send(0x2C);
rcv = ps2_host_recv_response();
if ((rcv & 1) == 1) {
// if on, disable pts
rcv = ps2_host_send(0xE2);
rcv = ps2_host_send(0x47);
rcv = ps2_host_send(0x2C);
rcv = ps2_host_send(0x01);
}
}
// 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;
}
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;
}
uint8_t ps2_host_recv(void)
{
return ps2_host_recv_response();
}