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miho |
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/** |
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* \brief Size-optimized code for TPI |
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* \file tpi.s |
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* \author S³awomir Fra |
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*/ |
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#include <avr/io.h> |
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#include "tpi_defs.h" |
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#define TPI_CLK_PORT PORTB |
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#define TPI_CLK_DDR DDRB |
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#define TPI_CLK_BIT 5 |
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#define TPI_DATAOUT_PORT PORTB |
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#define TPI_DATAOUT_DDR DDRB |
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#define TPI_DATAOUT_BIT 3 |
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#ifdef TPI_WITH_OPTO |
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# define TPI_DATAIN_PIN PINB |
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# define TPI_DATAIN_DDR DDRB |
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# define TPI_DATAIN_BIT 4 |
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#else |
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# define TPI_DATAIN_PIN PINB |
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# define TPI_DATAIN_BIT 3 |
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#endif |
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.comm tpi_dly_cnt, 2 |
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/** |
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* TPI init |
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*/ |
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.global tpi_init |
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tpi_init: |
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/* CLK <= out */ |
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sbi _SFR_IO_ADDR(TPI_CLK_DDR), TPI_CLK_BIT |
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#ifdef TPI_WITH_OPTO |
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/* DATAIN <= pull-up */ |
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cbi _SFR_IO_ADDR(TPI_DATAIN_DDR), TPI_DATAIN_BIT |
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sbi _SFR_IO_ADDR(TPI_DATAIN_PORT), TPI_DATAIN_BIT |
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/* DATAOUT <= high */ |
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sbi _SFR_IO_ADDR(TPI_DATAOUT_DDR), TPI_DATAOUT_BIT |
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sbi _SFR_IO_ADDR(TPI_DATAOUT_PORT), TPI_DATAOUT_BIT |
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#else |
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/* DATA <= pull-up */ |
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cbi _SFR_IO_ADDR(TPI_DATAOUT_DDR), TPI_DATAOUT_BIT |
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sbi _SFR_IO_ADDR(TPI_DATAOUT_PORT), TPI_DATAOUT_BIT |
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#endif |
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/* 32 bits */ |
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ldi r21, 32 |
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1: |
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rcall tpi_bit_h |
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dec r21 |
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brne 1b |
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ret |
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/** |
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* Update PR |
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* in: r25:r24 <= PR |
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* lost: r18-r21,r24,r30-r31 |
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*/ |
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tpi_pr_update: |
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movw r20, r24 |
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ldi r24, TPI_OP_SSTPR(0) |
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rcall tpi_send_byte |
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mov r24, r20 |
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rcall tpi_send_byte |
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ldi r24, TPI_OP_SSTPR(1) |
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rcall tpi_send_byte |
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mov r24, r21 |
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// rjmp tpi_send_byte |
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/** |
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* Send one byte |
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* in: r24 <= byte |
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* lost: r18-r19,r30-r31 |
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*/ |
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.global tpi_send_byte |
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tpi_send_byte: |
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/* start bit */ |
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rcall tpi_bit_l |
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/* 8 data bits */ |
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ldi r18, 8 |
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ldi r19, 0 |
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1: |
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// parity |
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eor r19, r24 |
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// get bit, shift |
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bst r24, 0 |
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lsr r24 |
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// send |
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rcall tpi_bit |
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dec r18 |
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brne 1b |
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/* parity bit */ |
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bst r19, 0 |
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rcall tpi_bit |
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/* 2 stop bits */ |
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rcall tpi_bit_h |
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// rjmp tpi_bit_h |
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/** |
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* Exchange of one bit |
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* in: T <= bit_in |
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* out: T => bit_out |
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* lost: r30-r31 |
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*/ |
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tpi_bit_h: |
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set |
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tpi_bit: |
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/* TPIDATA = T */ |
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#ifdef TPI_WITH_OPTO |
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// DATAOUT = high (opto should allow TPIDATA to be pulled low by external device) |
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// if(T == 0) |
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// DATAOUT = low |
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sbi _SFR_IO_ADDR(TPI_DATAOUT_PORT), TPI_DATAOUT_BIT |
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brts 1f |
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tpi_bit_l: |
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cbi _SFR_IO_ADDR(TPI_DATAOUT_PORT), TPI_DATAOUT_BIT |
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1: |
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#else |
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// DATAOUT = pull-up |
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// if(T == 0) |
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// DATAOUT = low |
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cbi _SFR_IO_ADDR(TPI_DATAOUT_DDR), TPI_DATAOUT_BIT |
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sbi _SFR_IO_ADDR(TPI_DATAOUT_PORT), TPI_DATAOUT_BIT |
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brts 1f |
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tpi_bit_l: |
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cbi _SFR_IO_ADDR(TPI_DATAOUT_PORT), TPI_DATAOUT_BIT |
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sbi _SFR_IO_ADDR(TPI_DATAOUT_DDR), TPI_DATAOUT_BIT |
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1: |
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#endif |
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/* delay(); */ |
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lds r30, tpi_dly_cnt |
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lds r31, tpi_dly_cnt+1 |
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1: |
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sbiw r30, 1 |
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brsh 1b |
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/* TPICLK = 1 */ |
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sbi _SFR_IO_ADDR(TPI_CLK_PORT), TPI_CLK_BIT |
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/* T = TPIDATA */ |
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in r30, _SFR_IO_ADDR(TPI_DATAIN_PIN) |
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bst r30, TPI_DATAIN_BIT |
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/* delay(); */ |
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lds r30, tpi_dly_cnt |
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lds r31, tpi_dly_cnt+1 |
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1: |
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sbiw r30, 1 |
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brsh 1b |
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/* TPICLK = 0 */ |
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cbi _SFR_IO_ADDR(TPI_CLK_PORT), TPI_CLK_BIT |
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ret |
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/** |
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* Receive one byte |
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* out: r24 => byte |
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* lost: r18-r19,r30-r31 |
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*/ |
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.global tpi_recv_byte |
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tpi_recv_byte: |
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/* waitfor(start_bit, 192); */ |
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ldi r18, 192 |
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1: |
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rcall tpi_bit_h |
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brtc .tpi_recv_found_start |
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dec r18 |
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brne 1b |
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/* no start bit: set return value */ |
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.tpi_break_ret0: |
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ldi r24, 0 |
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/* send 2 breaks (24++ bits) */ |
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ldi r18, 26 |
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1: |
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rcall tpi_bit_l |
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dec r18 |
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brne 1b |
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/* send hi */ |
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rjmp tpi_bit_h |
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// ---- |
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.tpi_recv_found_start: |
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/* recv 8bits(+calc.parity) */ |
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ldi r18, 8 |
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ldi r19, 0 |
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1: |
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rcall tpi_bit_h |
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lsr r24 |
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bld r24, 7 |
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eor r19, r24 |
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dec r18 |
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brne 1b |
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/* recv parity */ |
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rcall tpi_bit_h |
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bld r18, 7 |
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eor r19, r18 |
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brmi .tpi_break_ret0 |
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/* recv stop bits */ |
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rcall tpi_bit_h |
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rjmp tpi_bit_h |
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/** |
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* Read Block |
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*/ |
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.global tpi_read_block |
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tpi_read_block: |
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// X <= dptr |
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movw XL, r22 |
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// r23 <= len |
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mov r23, r20 |
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/* set PR */ |
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rcall tpi_pr_update |
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/* read data */ |
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.tpi_read_loop: |
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ldi r24, TPI_OP_SLD_INC |
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rcall tpi_send_byte |
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rcall tpi_recv_byte |
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st X+, r24 |
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dec r23 |
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brne .tpi_read_loop |
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ret |
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/** |
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* Write block |
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*/ |
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.global tpi_write_block |
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tpi_write_block: |
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// X <= sptr |
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movw XL, r22 |
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// r23 <= len |
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mov r23, r20 |
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/* set PR */ |
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rcall tpi_pr_update |
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/* write data */ |
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.tpi_write_loop: |
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ldi r24, TPI_OP_SOUT(NVMCMD) |
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rcall tpi_send_byte |
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ldi r24, NVMCMD_WORD_WRITE |
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rcall tpi_send_byte |
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ldi r24, TPI_OP_SST_INC |
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rcall tpi_send_byte |
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ld r24, X+ |
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rcall tpi_send_byte |
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.tpi_nvmbsy_wait: |
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ldi r24, TPI_OP_SIN(NVMCSR) |
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rcall tpi_send_byte |
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rcall tpi_recv_byte |
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andi r24, NVMCSR_BSY |
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brne .tpi_nvmbsy_wait |
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dec r23 |
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brne .tpi_write_loop |
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ret |