diff options
Diffstat (limited to 'Projects/XPLAINBridge/Lib')
| -rw-r--r-- | Projects/XPLAINBridge/Lib/SoftUART.S | 464 | ||||
| -rw-r--r-- | Projects/XPLAINBridge/Lib/SoftUART.h | 75 | ||||
| -rw-r--r-- | Projects/XPLAINBridge/Lib/SoftUARTConf.h | 75 |
3 files changed, 0 insertions, 614 deletions
diff --git a/Projects/XPLAINBridge/Lib/SoftUART.S b/Projects/XPLAINBridge/Lib/SoftUART.S deleted file mode 100644 index 673067b84..000000000 --- a/Projects/XPLAINBridge/Lib/SoftUART.S +++ /dev/null @@ -1,464 +0,0 @@ -/*
-
- uart_soft
-
- v0.2
-
- copyright John Steggall 2009
-
-*/
-
-
-/*
- Copyright 2009 John Steggall (steggall.j@gmail.com)
-
- Permission to use, copy, modify, and distribute this software
- and its documentation for any purpose and without fee is hereby
- granted, provided that the above copyright notice appear in all
- copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
- software without specific, written prior permission.
-
- The author disclaim all warranties with regard to this
- software, including all implied warranties of merchantability
- and fitness. In no event shall the author be liable for any
- special, indirect or consequential damages or any damages
- whatsoever resulting from loss of use, data or profits, whether
- in an action of contract, negligence or other tortious action,
- arising out of or in connection with the use or performance of
- this software.
-*/
-
-#include <avr/io.h>
-#include "SoftUARTConf.h"
-
-
-#define SFT_TX_EN 7
-
-#define SF_UART_TX 1
-#define SF_UART_RX 2
-
- .section .data
-
-rxdata:
- .byte 0
-txShifter:
- .byte 0
-txBitcount:
- .byte 0
-rxShifter:
- .byte 0
-rxBitcount:
- .byte 0
-
- .global status
-status:
- .byte 0
-
- .section .text
-
-
- .global RX_PIN_INT
-
-/*********************************************
- * External interrupt
- *
- * RX pin has gone low.
- */
-RX_PIN_INT:
- push r16
- lds r16,SREG
- push r16
-
-#if (RXPORT>=32)
- lds r16,RXPORT
- sbrc r16,0 // anti glitch
-
-#else
- sbic RXPORT,0
-#endif
-
- rjmp ignore
- nop
- nop
- nop
- nop
-
-#if (RXPORT>=32)
- lds r16,RXPORT
- sbrc r16,0 // anti glitch
-
-#else
- sbic RXPORT,0
-#endif
-
- rjmp ignore
-
- push r17
-
- // grab timer value
- lds r16,TC_COUNTL
- lds r17,TC_COUNTH
-
- // set trigger for RX timer (will need to add a little more though)
- sts TC_RX_COMPH,r17
- sts TC_RX_COMPL,r16
-
- pop r17
-
- // set bitcount to 0
- ldi r16,0
- sts rxBitcount,r16
-
-
- // turn off interrupt, will get annoying.
- cbi EXTI_MASK_REG,EXTI_MASK_BIT
-
- // turn on interrupt on compare match
-
- sbi TC_INTFLAG_REG,TC_RX_IF_BIT
-
- lds r16,TC_INT_MASK_REG
- ori r16,(1<<TC_RX_COMPEN)
- sts TC_INT_MASK_REG,r16
-
-ignore:
- pop r16
- sts SREG,r16
- pop r16
- reti
-
-
-/*********************************************
- * interrupt routine, timer compare match.
- *
- * TX bit rate timing
- */
- .global TIMER3_COMPB_vect
-
-TIMER3_COMPB_vect:
- push r16
- lds r16,SREG
- push r16
- push r17
- push r18
-
- // check if the last bit was sent
- lds r17,txBitcount
- inc r17
- cpi r17,0x0A
- sts txBitcount,r17
- breq lastBitTX
-
- lds r16,txShifter
-
-#if (TXPORT>=32)
- lds r17, TXPORT
- sbrs r16,0
- andi r17,~(1<<TXPIN)
- sbrc r16,0
- ori r17,(1<<TXPIN)
- sts TXPORT,r17
-
-#else
- sbrs r16,0
- cbi TXPORT,TXPIN
- sbrc r16,0
- sbi TXPORT,TXPIN
-
-#endif
- sec
- ror r16
-
-txout:
- sts txShifter,r16
-lastBitOut:
- pop r18
- pop r17
- pop r16
- sts SREG,r16
- pop r16
- reti
-
-// section handles the last bit (stop bit sent/received and sets the flag to say done //
-lastBitTX:
- lds r17,status // get status
- ori r17,SF_UART_TX // set TXC/DRE flag
- sts status,r17
-
- lds r16,TC_INT_MASK_REG
- andi r16,~(1<<TC_TX_COMPEN)
- sts TC_INT_MASK_REG,r16
-
- rjmp lastBitOut // over and out
-
-
-
-/*********************************************
- * interrupt routine, timer compare match.
- *
- * RX bit rate timing
- */
- .global TIMER3_COMPC_vect
-
-TIMER3_COMPC_vect:
- push r16
- lds r16,SREG
- push r16
- push r17
- push r18
-
- // check if the last bit has been recieved
- lds r17,rxBitcount
- inc r17
- cpi r17,0x0A
- sts rxBitcount,r17
- breq lastBitRX
-
- cpi r17,0x01
- breq rx1stbit
-
- ldi r18,3 // set counter to 3
- ldi r17,0
-
-#ifdef DEBUG
-
-#if RXPORT>64
- lds r16,RXPORT
- andi r16,~(1<<TXPIN)
- sts TXPORT,r16
-#else
- cbi TXPORT,TXPIN // marker
-#endif
-#endif
-
-loopGetBit:
-
-#if (RXPORT>=32)
- lds r16,RXPORT
- sbrs r16,RXPIN
-#else
- sbic RXPORT,RXPIN
-
-#endif
-
- inc r17
- dec r18
- nop
- nop
- nop
- nop
- brne loopGetBit
-
-#ifdef DEBUG
-
-#if RXPORT>64
- lds r16,RXPORT
- ori r16,1<<TXPIN
- sts r16
-
-#else
- sbi TXPORT,TXPIN // marker
-
-#endif
-#endif
-
-
- lds r16,rxShifter
- lsr r16
-
- cpi r17,2
- brlo skipBitSet
- ori r16,0x80
-skipBitSet:
- sts rxShifter,r16
- rjmp lastBitOut
-
-lastBitRX:
- lds r17,status // store status
-
-#if (RXPORT>=32)
- lds r16,RXPORT
- sbrc r16,RXPIN
-
-#else
- sbic RXPORT,RXPIN
-
-#endif
-
- ori r17,0x02 // set flag if stop bit was high
- sts status,r17
-
- lds r16,rxShifter // get contents of shifter
- sbrc r17,1 // check if we just received a valid byte
- sts rxdata,r16 // if valid rxdata = shifter
-
- // switch interrupt back on to get another go
-
- sbi EXTI_FLAG_REG,EXTI_MASK_BIT // clear interrupt flag
- sbi EXTI_MASK_REG,EXTI_MASK_BIT // enable external interrupt 0 (RX)
-
- // switch off rx bit timer
- lds r16,TC_INT_MASK_REG
- andi r16,~(1<<TC_RX_COMPEN)
- sts TC_INT_MASK_REG,r16
-
- rjmp lastBitOut // loud and clear
-
-rx1stbit:
- lds r16,TC_COUNTL
- lds r17,TC_COUNTH
-
- subi r16,lo8(BITLENGTH / 2)
- sbci r17,hi8(BITLENGTH / 2)
- brcc skipOverflow
-
- subi r16,lo8(0xFFFF - BITLENGTH)
- sbci r17,hi8(0xFFFF - BITLENGTH)
-
-skipOverflow:
- sts TC_RX_COMPH,r17
- sts TC_RX_COMPL,r17
- rjmp lastBitOut
-
-
-/*********************************************
- * void SoftUART_Init(void)
- *
- * initialises software uart and enables transmit
- */
- .global SoftUART_Init
-
-SoftUART_Init:
-
-#if (TXPORT>=32)
- lds r18,TXPORT
- ori r18,0x02
- sts TXPORT,r18
-
- lds r18,TXDIR_REG
- ori r18,0x02
- sts TXDIR_REG,r18
-
-#else
- sbi TXPORT,TXPIN
- sbi TXDIR_REG,TXPIN
-
-#endif
-
- ldi r18,(1<<SFT_TX_EN)|SF_UART_TX
- sts status,r18
-
- ldi r18,lo8(BITLENGTH)
- ldi r19,hi8(BITLENGTH)
- sts OCR3AH,r19
- sts OCR3AL,r18
-
- // Start timer 3
- ldi r18,0b00001001 // ctc count mode, clock div 1
- sts TC_CTRLB,r18
-
- // Interrupt on pin change INT0
- sbi EXTI_FLAG_REG,EXTI_MASK_BIT
- sbi EXTI_MASK_REG,EXTI_MASK_BIT
-
- ret
-
-
-/*********************************************
- * char SoftUART_RxByte(char)
- *
- * starts a byte send and returns the byte to be sent
- */
- .global SoftUART_TxByte
-
-SoftUART_TxByte:
- lds r18,status
- sbrs r18,SFT_TX_EN
- rjmp SoftUART_TxByte_end
-
- andi r18,0xFE // clear tx empty flag
- sts status,r18
-
- sts txShifter,r24
-
- ldi r18,0
- sts txBitcount,r18
-
- // grab timer value
- cli // Atomic section start
- lds r18,TC_COUNTL
- lds r19,TC_COUNTH
-
- // drop down tx line for start bit
-
-#if (TXPORT>=32)
- lds r20, TXPORT
- andi r20,~(1<<TXPIN)
- sts TXPORT,r20
-
-#else
- cbi TXPORT,TXPIN
-#endif
-
- // set trigger for tx timer
- sts TC_TX_COMPH,r19
- sts TC_TX_COMPL,r18
- sei // Atomic section end
-
- // clear interrupt flag and enable tx interrupt
-
- sbi TC_INTFLAG_REG,TC_TX_IF_BIT
-
- lds r18,TC_INT_MASK_REG
- ori r18,(1<<TC_TX_COMPEN)
- sts TC_INT_MASK_REG,r18
-
-SoftUART_TxByte_end:
- ret
-
-
-/*********************************************
- * char SoftUART_RxByte(void)
- *
- * returns the received byte
- */
- .global SoftUART_RxByte
-
-SoftUART_RxByte:
- lds r24,rxdata
- lds r18,status
- andi r18,0xFD
- sts status,r18
- ret
-
-
-/*********************************************
- * char SoftUART_IsReceived(void)
- *
- * checks if there is a byte in the receive buffer
- */
- .global SoftUART_IsReceived
-
-SoftUART_IsReceived:
- lds r24,status
- andi r24,SF_UART_RX
- lsr r24
- ret
-
-
-/*********************************************
- * char SoftUART_IsReady(void)
- *
- * Simulates polling UDRE to see if tx buffer is empty and ready
- *
- * returns 1 if empty 0 if not
- */
- .global SoftUART_IsReady
-
-SoftUART_IsReady:
- lds r24,status
- andi r24,SF_UART_TX
- ret
diff --git a/Projects/XPLAINBridge/Lib/SoftUART.h b/Projects/XPLAINBridge/Lib/SoftUART.h deleted file mode 100644 index f9eb018e8..000000000 --- a/Projects/XPLAINBridge/Lib/SoftUART.h +++ /dev/null @@ -1,75 +0,0 @@ -/*
-
- soft_uart
-
- v0.2
-
- Copyright John Steggall 2009
-
-*/
-
-
-/*
- Copyright 2009 John Steggall (steggall.j@gmail.com)
-
- Permission to use, copy, modify, and distribute this software
- and its documentation for any purpose and without fee is hereby
- granted, provided that the above copyright notice appear in all
- copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
- software without specific, written prior permission.
-
- The author disclaim all warranties with regard to this
- software, including all implied warranties of merchantability
- and fitness. In no event shall the author be liable for any
- special, indirect or consequential damages or any damages
- whatsoever resulting from loss of use, data or profits, whether
- in an action of contract, negligence or other tortious action,
- arising out of or in connection with the use or performance of
- this software.
-*/
-
-/*
- Specifically designed for the xplain board, other uses could be made by adjusting uart_soft_conf.h
- replacing the port, pin and timer assignments. Also relies on and external interupt to detect the low
- level of the start bit, in this case INT0.
- Always configured to 9600baud. Can be changed by setting the BITLENGTH define to F_CPU/(desired baud)
- code may need optimising when getting any faster to sample the bit in the correct place. No
- compensation has been made for the response time of the int routine.
-
- Note: Configured to use 16bit timers.
-
- */
-
-/* Changes
- *
- * v0.2
- * - Added configuration file to ease pain of setup for different hardware configuration
- * - Changed bit access for ports that can be accessed directly
- * - Fixed atomic section in uart_init to encompass counter read
- */
-
-#ifndef UART_SOFT_H
-#define UART_SOFT_H
-
- /* status */
- extern uint8_t status;
-
- /* initialises software uart and enables transmit */
- extern void SoftUART_Init(void);
-
- /* checks if there is a byte in the receive buffer*/
- extern unsigned char SoftUART_IsReceived(void);
-
- /* returns the received byte */
- extern unsigned char SoftUART_RxByte(void);
-
- /* starts a byte send and returns the byte to be sent */
- extern unsigned char SoftUART_TxByte(unsigned char data);
-
- /* Simulates polling UDRE to see if tx buffer is empty and ready */
- extern unsigned char SoftUART_IsReady(void);
-
-#endif
diff --git a/Projects/XPLAINBridge/Lib/SoftUARTConf.h b/Projects/XPLAINBridge/Lib/SoftUARTConf.h deleted file mode 100644 index bd1280228..000000000 --- a/Projects/XPLAINBridge/Lib/SoftUARTConf.h +++ /dev/null @@ -1,75 +0,0 @@ -/*
-
- soft_uart
-
- v0.2
-
- Copyright John Steggall 2009
-
-*/
-
-/*
- Copyright 2009 John Steggall (steggall.j@gmail.com)
-
- Permission to use, copy, modify, and distribute this software
- and its documentation for any purpose and without fee is hereby
- granted, provided that the above copyright notice appear in all
- copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
- software without specific, written prior permission.
-
- The author disclaim all warranties with regard to this
- software, including all implied warranties of merchantability
- and fitness. In no event shall the author be liable for any
- special, indirect or consequential damages or any damages
- whatsoever resulting from loss of use, data or profits, whether
- in an action of contract, negligence or other tortious action,
- arising out of or in connection with the use or performance of
- this software.
-*/
-
-#ifndef UART_SOFT_CONF
-#define UART_SOFT_CONF
-
- #define BITLENGTH 833 // Length of data bit, worked out by F_CPU/desired baud
-
- #define TXPIN 1 // Port pin TX is connected to
- #define RXPIN 0 // Port pin RX is connected to
-
- /* PORT setup */
- #define RXPORT 0x09 // RX port selection
- #define TXPORT 0x0B // TX port selection
- #define TXDIR_REG 0x0A // Data direction port for TX pin
-
- /* RX pin setup */
- #define EXTI_FLAG_REG 0x1C
- #define EXTI_MASK_REG 0x1D
- #define EXTI_MASK_BIT 0
-
- #define RX_PIN_INT INT0_vect // external interrupt vector for RX pin
- #define RX_INT_vect TIMER3_COMPC_vect // interrupt vector for OCRnC
- #define TX_INT_vect TIMER3_COMPB_vect // interrupt vector for OCRnB
-
- #define TC_INT_MASK_REG TIMSK3 // interrupt timer mask register for timer(n)
- #define TC_COUNTL TCNT3L // count high register for timer(n)
- #define TC_COUNTH TCNT3H // count low register for timer(n)
-
- /* Reciever setup */
- #define TC_RX_COMPEN OCIE3C // interrupt enable for OCRnC (RX bit timer)
- #define TC_RX_COMPH OCR3CH // OCRnC compare match high register
- #define TC_RX_COMPL OCR3CL // OCRnC compare match high register
-
- /* Transmitter setup */
- #define TC_TX_COMPEN OCIE3B // interrupt enable for OCRnB (TX bit timer)
- #define TC_TX_COMPH OCR3BH // OCRnB compare match high register
- #define TC_TX_COMPL OCR3BL // OCRnB compare match low register
-
- #define TC_CTRLB TCCR3B // timer(n) control register B
-
- #define TC_INTFLAG_REG 0x18 // timer(n) interupt flag register
- #define TC_TX_IF_BIT OCIE3B // timer(n) interrupt flag bit for OCRnB
- #define TC_RX_IF_BIT OCIE3C // timer(n) interrupt flag bit for OCRnC
-
-#endif
|