Revision 39
fixed frozen keyboard
| lab3/kbc.c | ||
|---|---|---|
| 66 | 66 |
int (kbd_poll)(uint8_t bytes[], uint8_t *size){
|
| 67 | 67 |
if(bytes == NULL || size == NULL) return 1; |
| 68 | 68 |
uint8_t c; |
| 69 |
if(kbd_read_byte(&c)) return 1;
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|
| 69 |
if(kbc_read_byte(&c)) return 1;
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|
| 70 | 70 |
if(c == TWO_BYTE_CODE){
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| 71 |
if(kbd_read_byte(&bytes[0])) return 1;
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|
| 71 |
if(kbc_read_byte(&bytes[0])) return 1;
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|
| 72 | 72 |
bytes[1] = c; |
| 73 | 73 |
*size = 2; |
| 74 | 74 |
}else{
|
| ... | ... | |
| 79 | 79 |
return 0; |
| 80 | 80 |
} |
| 81 | 81 |
|
| 82 |
int (kbd_issue_cmd)(uint8_t cmd){
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|
| 82 |
int (kbc_read_cmd)(uint8_t *cmd){
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|
| 83 |
if(kbc_issue_cmd(READ_KBC_CMD)) return 1; |
|
| 84 |
if(kbc_read_byte(cmd)) return 1; |
|
| 85 |
return 0; |
|
| 86 |
} |
|
| 87 |
|
|
| 88 |
int (kbc_change_cmd)(uint8_t cmd){
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|
| 89 |
if(kbc_issue_cmd(WRITE_KBC_CMD)) return 1; |
|
| 90 |
if(sys_outb(KBC_CMD_ARG, cmd)) return 1; |
|
| 91 |
return 0; |
|
| 92 |
} |
|
| 93 |
|
|
| 94 |
int (kbc_issue_cmd)(uint8_t cmd){
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|
| 83 | 95 |
uint8_t stat; |
| 84 |
for(int i = 0; i < 10; ++i){
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|
| 96 |
while(1){
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|
| 85 | 97 |
if(util_sys_inb(STATUS_REG, &stat)) return 1; |
| 86 | 98 |
if((stat&IN_BUF_FULL) == 0){
|
| 87 | 99 |
if(sys_outb(KBC_CMD, cmd)) return 1; |
| ... | ... | |
| 92 | 104 |
return 1; |
| 93 | 105 |
} |
| 94 | 106 |
|
| 95 |
int (kbd_read_byte)(uint8_t *byte){
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|
| 107 |
int (kbc_read_byte)(uint8_t *byte){
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|
| 96 | 108 |
uint8_t stat; |
| 97 | 109 |
while(true){
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| 98 | 110 |
if(util_sys_inb(STATUS_REG, &stat)) return 1; |
| ... | ... | |
| 104 | 116 |
tickdelay(micros_to_ticks(DELAY)); |
| 105 | 117 |
} |
| 106 | 118 |
} |
| 107 |
|
|
| 108 |
int (kbd_read_cmd)(uint8_t *cmd){
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|
| 109 |
if(kbd_issue_cmd(0x20)) return 1; |
|
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if(kbd_read_byte(cmd)) return 1; |
|
| 111 |
return 0; |
|
| 112 |
} |
|
| lab3/kbc.h | ||
|---|---|---|
| 41 | 41 |
#define TWO_BYTE_CODE 0xE0 /* @brief First byte of a two byte Scancode */ |
| 42 | 42 |
#define BREAK_CODE_BIT BIT(7) /* @brief Bit to distinguish between Make code and Break code */ |
| 43 | 43 |
|
| 44 |
/* Command byte masks */ |
|
| 45 |
#define INT_KBD BIT(0) |
|
| 46 |
#define INT_MOU BIT(1) |
|
| 47 |
#define DIS_KBD BIT(4) |
|
| 48 |
#define DIS_MOU BIT(5) |
|
| 49 |
|
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| 44 | 50 |
#endif |
| lab3/kbc_func.h | ||
|---|---|---|
| 44 | 44 |
*/ |
| 45 | 45 |
int (kbd_poll)(uint8_t bytes[], uint8_t *size); |
| 46 | 46 |
|
| 47 |
int (kbd_issue_cmd)(uint8_t cmd); |
|
| 47 |
/** |
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| 48 |
* @brief High-level function that reads the command byte of the KBC |
|
| 49 |
* @param cmd Pointer to variable where command byte read from KBC will be stored |
|
| 50 |
* @return 0 if operation was successful, 1 otherwise |
|
| 51 |
*/ |
|
| 52 |
int (kbc_read_cmd)(uint8_t *cmd); |
|
| 48 | 53 |
|
| 49 | 54 |
/** |
| 55 |
* @brief High-level function that changes the command byte of the KBC |
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* @param cmd New value for command byte of KBC |
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* @return 0 if operation was successful, 1 otherwise |
|
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*/ |
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int (kbc_change_cmd)(uint8_t cmd); |
|
| 60 |
|
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| 61 |
/** |
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| 62 |
* @brief Low-level function to issue a command to keyboard |
|
| 63 |
* @param cmd command to be issued |
|
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* @return 0 if operation was successful, 1 otherwise |
|
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*/ |
|
| 66 |
int (kbc_issue_cmd)(uint8_t cmd); |
|
| 67 |
|
|
| 68 |
/** |
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| 50 | 69 |
* @brief Low-level function for reading byte from keyboard |
| 51 | 70 |
* Low-level function for reading byte from keyboard. Waits until output buffer |
| 52 | 71 |
* is full |
| 53 | 72 |
* @param value Pointer to variable where byte read from keyboard will be stored |
| 54 | 73 |
* @return 0 if operation was successful, 1 otherwise |
| 55 | 74 |
*/ |
| 56 |
int (kbd_read_byte)(uint8_t *byte);
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|
| 75 |
int (kbc_read_byte)(uint8_t *byte);
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| 57 | 76 |
|
| 58 |
int (kbd_read_cmd)(uint8_t *cmd); |
|
| 59 | 77 |
|
| 60 | 78 |
#endif |
| lab3/lab3.c | ||
|---|---|---|
| 98 | 98 |
}while(!(size == 1 && c[0] == ESC_BREAK_CODE)); |
| 99 | 99 |
|
| 100 | 100 |
uint8_t cmd = 0; |
| 101 |
if(kbd_read_cmd(&cmd)) return 1;
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|
| 102 |
printf("%x\n", cmd);
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| 101 |
if(kbc_read_cmd(&cmd)) return 1;
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| 102 |
cmd = (cmd | INT_KBD) & (~DIS_KBD);
|
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| 103 | 103 |
|
| 104 |
if(kbc_change_cmd(cmd)) return 1; |
|
| 105 |
|
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| 104 | 106 |
return 0; |
| 105 | 107 |
} |
| 106 | 108 |
|
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