--- /dev/null
+#ifndef RING_BUFFER_H
+#define RING_BUFFER_H
+/*--------------------------------------------------------------------
+ * Ring buffer to store scan codes from keyboard
+ *------------------------------------------------------------------*/
+#define RBUF_SIZE 32
+static uint8_t rbuf[RBUF_SIZE];
+static uint8_t rbuf_head = 0;
+static uint8_t rbuf_tail = 0;
+static inline void rbuf_enqueue(uint8_t data)
+{
+ uint8_t sreg = SREG;
+ cli();
+ uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
+ if (next != rbuf_tail) {
+ rbuf[rbuf_head] = data;
+ rbuf_head = next;
+ } else {
+ print("rbuf: full\n");
+ }
+ SREG = sreg;
+}
+static inline uint8_t rbuf_dequeue(void)
+{
+ uint8_t val = 0;
+
+ uint8_t sreg = SREG;
+ cli();
+ if (rbuf_head != rbuf_tail) {
+ val = rbuf[rbuf_tail];
+ rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
+ }
+ SREG = sreg;
+
+ return val;
+}
+static inline bool rbuf_has_data(void)
+{
+ uint8_t sreg = SREG;
+ cli();
+ bool has_data = (rbuf_head != rbuf_tail);
+ SREG = sreg;
+ return has_data;
+}
+static inline void rbuf_clear(void)
+{
+ uint8_t sreg = SREG;
+ cli();
+ rbuf_head = rbuf_tail = 0;
+ SREG = sreg;
+}
+
+#endif /* RING_BUFFER_H */
{
uint8_t ret;
print("Enable break: ");
- // valid scancode: 00-77h
- for (uint8_t code = 0; code < 0x78; code++) {
- while (ibm4704_send(0x80|code) != 0) {
- print("z");
- _delay_us(500);
- }
- _delay_us(2000);
- ret = ibm4704_recv();
- if (ret != 0xff) {
+ // valid scancode: 00-79h
+ for (uint8_t code = 0; code < 0x7A; code++) {
+ while (ibm4704_send(0x80|code)) _delay_ms(1);
+ // get none when ok, get FD when out of bound
+ _delay_ms(5);
+ if ((ret = ibm4704_recv()) != 0xff) {
xprintf("c%02X:r%02X ", code, ret);
}
- _delay_us(1000);
+ _delay_ms(1);
}
_delay_us(1000);
- while (ibm4704_send(0xFF) != 0) { _delay_us(500); } // End
+ while (ibm4704_send(0xFF)) { _delay_ms(1); } // End
print("End\n");
}
void matrix_init(void)
{
- uint8_t ret;
- debug_enable = true;
+ debug_enable = false;
ibm4704_init();
matrix_clear();
- // read keyboard id
- while ((ret = ibm4704_recv()) == 0xFF) {
- ibm4704_send(0xFE);
- _delay_us(100);
- }
+ _delay_ms(2000); // wait for starting up debug console
- _delay_ms(2000); // wait for starting up debug console
print("IBM 4704 converter\n");
- xprintf("Keyboard ID: %02X\n", ret);
+ while (ibm4704_send(0xFE)) _delay_ms(1); // resend
+ _delay_ms(5);
+ xprintf("Keyboard ID: %02X\n", ibm4704_recv());
enable_break();
}
if (code==0xFF) {
// Not receivd
return 0;
- } else if ((code&0x78)==0x78) {
- // 0xFF-F8 and 0x7F-78 is not scancode
- xprintf("Error: %0X\n", code);
+ } else if ((code&0x7F) >= 0x7A) {
+ // 0xFF-FA and 0x7F-7A is not scancode
+ xprintf("Error: %02X\n", code);
matrix_clear();
return 0;
} else if (code&0x80) {
+ dprintf("%02X\n", code);
matrix_make(code);
} else {
+ dprintf("%02X\n", code);
matrix_break(code);
}
return 1;
#include <stdbool.h>
#include <util/delay.h>
#include "debug.h"
+#include "ring_buffer.h"
#include "ibm4704.h"
void ibm4704_init(void)
{
- inhibit();
+ IBM4704_INT_INIT();
+ IBM4704_INT_ON();
+ idle();
}
/*
bool parity = true; // odd parity
ibm4704_error = 0;
+ IBM4704_INT_OFF();
+
/* Request to send */
idle();
clock_lo();
/* Data bit */
for (uint8_t i = 0; i < 8; i++) {
WAIT(clock_hi, 100, 0x40+i);
- //_delay_us(5);
if (data&(1<<i)) {
parity = !parity;
data_hi();
/* End */
WAIT(data_lo, 100, 0x36);
- inhibit();
- _delay_us(200); // wait to recover clock to hi
+ idle();
+ IBM4704_INT_ON();
return 0;
ERROR:
- inhibit();
- if (ibm4704_error >= 0x30) {
- xprintf("x%02X ", ibm4704_error);
+ idle();
+ if (ibm4704_error > 0x30) {
+ xprintf("S:%02X ", ibm4704_error);
}
- _delay_us(200); // wait to recover clock to hi
+ IBM4704_INT_ON();
return -1;
}
-/* receive data when host want else inhibit communication */
+/* wait forever to receive data */
uint8_t ibm4704_recv_response(void)
{
- // 250 * 100us(wait start bit in ibm4704_recv)
- uint8_t data = 0;
- uint8_t try = 250;
- do {
- data = ibm4704_recv();
- } while (try-- && ibm4704_error);
- return data;
+ while (!rbuf_has_data()) {
+ _delay_ms(1);
+ }
+ return rbuf_dequeue();
}
/*
*/
uint8_t ibm4704_recv(void)
{
- uint8_t data = 0;
- bool parity = true; // odd parity
- ibm4704_error = IBM4704_ERR_NONE;
-
- idle();
- _delay_us(5); // wait for line settles
-
- /* start bit */
- WAIT(clock_lo, 100, 0x11); // wait for keyboard to send
- WAIT(data_hi, 100, 0x12); // can be delayed that long
-
- WAIT(clock_hi, 100, 0x13); // first rising edge which can take longer
- /* data */
- for (uint8_t i = 0; i < 8; i++) {
- WAIT(clock_hi, 100, 0x20+i);
- //_delay_us(5);
- if (data_in()) {
- parity = !parity;
- data |= (1<<i);
- }
- WAIT(clock_lo, 150, 0x28+i);
+ if (rbuf_has_data()) {
+ return rbuf_dequeue();
+ } else {
+ return -1;
}
+}
- /* parity */
- WAIT(clock_hi, 100, 0x17);
- if (data_in() != parity) {
- ibm4704_error = IBM4704_ERR_PARITY;
- goto ERROR;
- }
- WAIT(clock_lo, 150, 0x18);
-
- /* stop bit */
- WAIT(clock_hi, 100, 0x19);
- WAIT(data_lo, 1, 0x19);
+ISR(IBM4704_INT_VECT)
+{
+ static enum {
+ INIT, START, BIT0, BIT1, BIT2, BIT3, BIT4, BIT5, BIT6, BIT7, PARITY,
+ } state = INIT;
+ // LSB first
+ static uint8_t data = 0;
+ // Odd parity
+ static uint8_t parity = false;
- inhibit();
- _delay_us(200); // wait to recover clock to hi
- return data;
-ERROR:
- if (ibm4704_error > 0x12) {
- xprintf("x%02X ", ibm4704_error);
+ ibm4704_error = 0;
+ // return unless falling edge
+ if (clock_in()) { goto RETURN; } // why this occurs?
+
+ state++;
+ switch (state) {
+ case START:
+ // Data:Low
+ WAIT(data_hi, 10, state);
+ break;
+ case BIT0:
+ case BIT1:
+ case BIT2:
+ case BIT3:
+ case BIT4:
+ case BIT5:
+ case BIT6:
+ case BIT7:
+ data >>= 1;
+ if (data_in()) {
+ data |= 0x80;
+ parity = !parity;
+ }
+ break;
+ case PARITY:
+ if (data_in()) {
+ parity = !parity;
+ }
+ if (!parity)
+ goto ERROR;
+ rbuf_enqueue(data);
+ ibm4704_error = IBM4704_ERR_NONE;
+ goto DONE;
+ break;
+ default:
+ goto ERROR;
}
- inhibit();
- _delay_us(200); // wait to recover clock to hi
- return -1;
+ goto RETURN;
+ERROR:
+ ibm4704_error = state;
+ while (ibm4704_send(0xFE)) _delay_ms(1); // resend
+ xprintf("R:%02X\n", data);
+DONE:
+ state = INIT;
+ data = 0;
+ parity = false;
+RETURN:
+ return;
}
projects / max / tmk_keyboard.git / commitdiff