diff options
Diffstat (limited to 'keyboards/hhkb/rn42/suart.S')
| -rw-r--r-- | keyboards/hhkb/rn42/suart.S | 156 |
1 files changed, 0 insertions, 156 deletions
diff --git a/keyboards/hhkb/rn42/suart.S b/keyboards/hhkb/rn42/suart.S deleted file mode 100644 index 09c45ce230..0000000000 --- a/keyboards/hhkb/rn42/suart.S +++ /dev/null @@ -1,156 +0,0 @@ -;---------------------------------------------------------------------------; -; Software implemented UART module ; -; (C)ChaN, 2005 (http://elm-chan.org/) ; -;---------------------------------------------------------------------------; -; Bit rate settings: -; -; 1MHz 2MHz 4MHz 6MHz 8MHz 10MHz 12MHz 16MHz 20MHz -; 2.4kbps 138 - - - - - - - - -; 4.8kbps 68 138 - - - - - - - -; 9.6kbps 33 68 138 208 - - - - - -; 19.2kbps - 33 68 102 138 173 208 - - -; 38.4kbps - - 33 50 68 85 102 138 172 -; 57.6kbps - - 21 33 44 56 68 91 114 -; 115.2kbps - - - - 21 27 33 44 56 - -.nolist -#include <avr/io.h> -.list - -#define BPS 44 /* Bit delay. (see above table) */ -#define BIDIR 0 /* 0:Separated Tx/Rx, 1:Shared Tx/Rx */ - -#define OUT_1 sbi _SFR_IO_ADDR(SUART_OUT_PORT), SUART_OUT_BIT /* Output 1 */ -#define OUT_0 cbi _SFR_IO_ADDR(SUART_OUT_PORT), SUART_OUT_BIT /* Output 0 */ -#define SKIP_IN_1 sbis _SFR_IO_ADDR(SUART_IN_PIN), SUART_IN_BIT /* Skip if 1 */ -#define SKIP_IN_0 sbic _SFR_IO_ADDR(SUART_IN_PIN), SUART_IN_BIT /* Skip if 0 */ - - - -#ifdef SPM_PAGESIZE -.macro _LPMI reg - lpm \reg, Z+ -.endm -.macro _MOVW dh,dl, sh,sl - movw \dl, \sl -.endm -#else -.macro _LPMI reg - lpm - mov \reg, r0 - adiw ZL, 1 -.endm -.macro _MOVW dh,dl, sh,sl - mov \dl, \sl - mov \dh, \sh -.endm -#endif - - - -;---------------------------------------------------------------------------; -; Transmit a byte in serial format of N81 -; -;Prototype: void xmit (uint8_t data); -;Size: 16 words - -.global xmit -.func xmit -xmit: -#if BIDIR - ldi r23, BPS-1 ;Pre-idle time for bidirectional data line -5: dec r23 ; - brne 5b ;/ -#endif - in r0, _SFR_IO_ADDR(SREG) ;Save flags - - com r24 ;C = start bit - ldi r25, 10 ;Bit counter - cli ;Start critical section - -1: ldi r23, BPS-1 ;----- Bit transferring loop -2: dec r23 ;Wait for a bit time - brne 2b ;/ - brcs 3f ;MISO = bit to be sent - OUT_1 ; -3: brcc 4f ; - OUT_0 ;/ -4: lsr r24 ;Get next bit into C - dec r25 ;All bits sent? - brne 1b ; no, coutinue - - out _SFR_IO_ADDR(SREG), r0 ;End of critical section - ret -.endfunc - - - -;---------------------------------------------------------------------------; -; Receive a byte -; -;Prototype: uint8_t rcvr (void); -;Size: 19 words - -.global rcvr -.func rcvr -rcvr: - in r0, _SFR_IO_ADDR(SREG) ;Save flags - - ldi r24, 0x80 ;Receiving shift reg - cli ;Start critical section - -1: SKIP_IN_1 ;Wait for idle - rjmp 1b -2: SKIP_IN_0 ;Wait for start bit - rjmp 2b - ldi r25, BPS/2 ;Wait for half bit time -3: dec r25 - brne 3b - -4: ldi r25, BPS ;----- Bit receiving loop -5: dec r25 ;Wait for a bit time - brne 5b ;/ - lsr r24 ;Next bit - SKIP_IN_0 ;Get a data bit into r24.7 - ori r24, 0x80 - brcc 4b ;All bits received? no, continue - - out _SFR_IO_ADDR(SREG), r0 ;End of critical section - ret -.endfunc - - -; Not wait for start bit. This should be called after detecting start bit. -.global recv -.func recv -recv: - in r0, _SFR_IO_ADDR(SREG) ;Save flags - - ldi r24, 0x80 ;Receiving shift reg - cli ;Start critical section - -;1: SKIP_IN_1 ;Wait for idle -; rjmp 1b -;2: SKIP_IN_0 ;Wait for start bit -; rjmp 2b - ldi r25, BPS/2 ;Wait for half bit time -3: dec r25 - brne 3b - -4: ldi r25, BPS ;----- Bit receiving loop -5: dec r25 ;Wait for a bit time - brne 5b ;/ - lsr r24 ;Next bit - SKIP_IN_0 ;Get a data bit into r24.7 - ori r24, 0x80 - brcc 4b ;All bits received? no, continue - - ldi r25, BPS/2 ;Wait for half bit time -6: dec r25 - brne 6b -7: SKIP_IN_1 ;Wait for stop bit - rjmp 7b - - out _SFR_IO_ADDR(SREG), r0 ;End of critical section - ret -.endfunc |