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Add cli() to protoect ADB critical timing part

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tmk 2013-11-08 04:25:22 +09:00
parent eea3b699a6
commit 94823030f0
1 changed files with 7 additions and 11 deletions
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18
protocol/adb.c
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@ -41,7 +41,6 @@ POSSIBILITY OF SUCH DAMAGE.
#include <avr/io.h>
#include <avr/interrupt.h>
#include "adb.h"
#include "debug.h"
// GCC doesn't inline functions normally
@ -125,16 +124,15 @@ bool adb_host_psw(void)
uint16_t adb_host_kbd_recv(void)
{
uint16_t data = 0;
cli();
attention();
send_byte(0x2C); // Addr:Keyboard(0010), Cmd:Talk(11), Register0(00)
place_bit0(); // Stopbit(0)
if (!wait_data_lo(500)) { // Tlt/Stop to Start(140-260us)
sei();
return 0; // No data to send
}
// ad hoc fix: without block inerrupt read wrong bit occasionally and get keys stuck
// TODO: is this needed anymore with improved timing?
//cli();
uint8_t n = 17; // start bit + 16 data bits
do {
uint8_t lo = (uint8_t) wait_data_hi(130);
@ -153,10 +151,8 @@ uint16_t adb_host_kbd_recv(void)
data |= 1;
}
else if (n == 17) {
// Service Request
dprintf("Startbit ERROR\n");
sei();
return -2;
return -20;
}
}
while ( --n );
@ -164,21 +160,20 @@ uint16_t adb_host_kbd_recv(void)
// Stop bit can't be checked normally since it could have service request lenghtening
// and its high state never goes low.
if (!wait_data_hi(351) || wait_data_lo(91)) {
dprintf("Stopbit ERROR\n");
sei();
return -3;
return -21;
}
sei();
return data;
error:
dprintf("Bit ERROR\n");
sei();
return -4;
return -n;
}
void adb_host_listen(uint8_t cmd, uint8_t data_h, uint8_t data_l)
{
cli();
attention();
send_byte(cmd);
place_bit0(); // Stopbit(0)
@ -187,6 +182,7 @@ void adb_host_listen(uint8_t cmd, uint8_t data_h, uint8_t data_l)
send_byte(data_h);
send_byte(data_l);
place_bit0(); // Stopbit(0);
sei();
}
// send state of LEDs