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https://github.com/raphnet/dreamcast_usb
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Add a C implementation to send data from program memory
This commit is contained in:
Raphaël Assénat
parent
3ab2dc3590
commit
e71b151d5b
@ -7,5 +7,5 @@ echo "// Number of samples: $NSAMPLES"
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for i in `seq 0 $NSAMPLES`
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do
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echo "\" in r16, %2\n st z+, r16 \n\" // sample $i "
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echo "\" in r16, %1\n st z+, r16 \n\" // sample $i "
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done
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207
maplebus.c
207
maplebus.c
@ -18,6 +18,7 @@
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* The author may be contacted at raph@raphnet.net
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*/
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <util/delay.h>
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#include <string.h>
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@ -26,7 +27,7 @@
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#undef NOLRC
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#undef TRACE_RX_START_END
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#undef TRACE_DECODED
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#undef TRACE_PIN1_BITS
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#define TRACE_PIN1_BITS
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//
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//
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@ -41,10 +42,10 @@ void maple_init(void)
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}
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#define transmitMode() do { PORTC |= 0x03; DDRC |= 0x03; } while(0)
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#define inputMode() do { PORTC |= 0x03; DDRC &= ~0x03; } while(0)
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#define nop() asm volatile("nop\n");
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#define MAPLE_BUF_SIZE 641
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static unsigned char maplebuf[MAPLE_BUF_SIZE];
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volatile unsigned char maplebuf[MAPLE_BUF_SIZE];
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static unsigned char buf_used;
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static unsigned char buf_phase;
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@ -200,11 +201,10 @@ static int maplebus_decode(unsigned char *data, unsigned int maxlen)
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*/
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int maple_receiveFrame(unsigned char *data, unsigned int maxlen)
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{
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unsigned char *tmp = maplebuf;
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unsigned char lrc;
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unsigned char timeout;
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int res, i;
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//
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// __ _ _ _
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// |_____| |_| |_| |_
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@ -217,8 +217,10 @@ int maple_receiveFrame(unsigned char *data, unsigned int maxlen)
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asm volatile(
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" push r30 \n" // 2
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" push r31 \n" // 2
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" clr %1 \n" // 1 (result=0, no timeout)
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" clr %0 \n" // 1 (result=0, no timeout)
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" ldi r30, lo8(maplebuf) \n"
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" ldi r31, hi8(maplebuf) \n"
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// " sbi 0x5, 4 \n" // PB4
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// " cbi 0x5, 4 \n"
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@ -228,17 +230,17 @@ int maple_receiveFrame(unsigned char *data, unsigned int maxlen)
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" dec r19 \n"
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" breq timeout \n"
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" ldi r18, 255 \n"
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" in r17, %2 \n"
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" in r17, %1 \n"
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"wait_start_inner: \n"
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" dec r18 \n"
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" breq wait_start_outer \n"
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" in r16, %2 \n"
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" in r16, %1 \n"
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" cp r16, r17 \n"
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" breq wait_start_inner \n"
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" rjmp start_rx \n"
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"timeout:\n"
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" inc %1 \n" // 1 for timeout
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" inc %0 \n" // 1 for timeout
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" sbi 0x5, 4 \n" // PB4
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" cbi 0x5, 4 \n"
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" jmp done \n"
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@ -260,7 +262,7 @@ int maple_receiveFrame(unsigned char *data, unsigned int maxlen)
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#endif
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" pop r31 \n" // 2
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" pop r30 \n" // 2
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: "=z"(tmp), "=r"(timeout)
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: "=r"(timeout)
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: "I" (_SFR_IO_ADDR(PINC))
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: "r16","r17","r18","r19") ;
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@ -300,6 +302,170 @@ int maple_receiveFrame(unsigned char *data, unsigned int maxlen)
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return res-1; // remove lrc
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}
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static void maple_sendByte(uint8_t data)
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{{{
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// Phase 1 initial state (pin 1 high, pin 5 low);
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PORTC = 0x01;
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_delay_us(1);
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if (data & 0x80)
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PORTC |= 0x02;
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nop();
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PORTC &= ~0x01;
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_delay_us(1);
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// Phase 2 initial state (pin 1 low, pin 5 high;
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PORTC = 0x02;
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_delay_us(1);
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if (data & 0x40)
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PORTC |= 0x01;
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nop();
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PORTC &= ~0x02;
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_delay_us(1);
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// Phase 1 initial state (pin 1 high, pin 5 low);
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PORTC = 0x01;
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_delay_us(1);
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if (data & 0x20)
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PORTC |= 0x02;
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nop();
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PORTC &= ~0x01;
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_delay_us(1);
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// Phase 2 initial state (pin 1 low, pin 5 high;
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PORTC = 0x02;
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_delay_us(1);
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if (data & 0x10)
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PORTC |= 0x01;
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nop();
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PORTC &= ~0x02;
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_delay_us(1);
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// Phase 1 initial state (pin 1 high, pin 5 low);
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PORTC = 0x01;
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_delay_us(1);
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if (data & 0x08)
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PORTC |= 0x02;
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nop();
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PORTC &= ~0x01;
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_delay_us(1);
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// Phase 2 initial state (pin 1 low, pin 5 high;
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PORTC = 0x02;
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_delay_us(1);
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if (data & 0x04)
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PORTC |= 0x01;
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nop();
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PORTC &= ~0x02;
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_delay_us(1);
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// Phase 1 initial state (pin 1 high, pin 5 low);
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PORTC = 0x01;
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_delay_us(1);
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if (data & 0x02)
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PORTC |= 0x02;
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nop();
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PORTC &= ~0x01;
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_delay_us(1);
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// Phase 2 initial state (pin 1 low, pin 5 high;
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PORTC = 0x02;
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_delay_us(1);
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if (data & 0x01)
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PORTC |= 0x01;
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nop();
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PORTC &= ~0x02;
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_delay_us(1);
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}}}
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/* Slower C implementation for sending data from program memory. */
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void maple_sendRaw_P(unsigned char header_data[4], PGM_P data, unsigned char len)
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{
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int i;
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uint8_t tmp;
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uint8_t lrc = 0;
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transmitMode();
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// Initially both lines are high
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PORTC = 0x03;
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// Pin 1 falls
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PORTC = 0x02;
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_delay_us(1);
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// Pin 5 falls
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PORTC = 0x00;
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_delay_us(1);
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// 3 pulses on pin 5
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PORTC = 0x02;
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_delay_us(1);
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PORTC = 0x00;
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_delay_us(1);
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PORTC = 0x02;
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_delay_us(1);
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PORTC = 0x00;
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_delay_us(1);
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PORTC = 0x02;
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_delay_us(1);
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PORTC = 0x00;
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_delay_us(1);
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PORTC = 0x02;
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_delay_us(1);
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PORTC = 0x03;
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_delay_us(1);
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// Phase 1 initial state (pin 1 high, pin 5 low);
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PORTC = 0x01;
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for (i=0; i<4; i++) {
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maple_sendByte(header_data[i]);
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lrc ^= header_data[i];
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}
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for (i=0; i<len; i++) {
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// Swap byte order in each word
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tmp = pgm_read_byte(data + (i&0xfc) + (3-(i&0x03)));
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maple_sendByte(tmp);
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lrc ^= tmp;
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if (i && (i%8==0)) {
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_delay_us(30);
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}
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}
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maple_sendByte(lrc);
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// End of frame initial state (Pin 1 high, pin 5 low)
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PORTC = 0x01;
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_delay_us(1);
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// pulse on pin5
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PORTC = 0x03;
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_delay_us(1);
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PORTC = 0x01;
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_delay_us(1);
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// pin 1 falls
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PORTC = 0x00;
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_delay_us(1);
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// pin 1 pulse
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PORTC = 0x01;
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_delay_us(1);
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PORTC = 0x00;
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_delay_us(1);
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// pin 1 rise
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PORTC = 0x01;
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_delay_us(1);
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// pin 5 rise
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PORTC = 0x03;
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inputMode();
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}
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void maple_sendRaw(unsigned char *data, unsigned char len)
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{
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int i;
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@ -408,15 +574,28 @@ void maple_sendFrame1W(uint8_t cmd, uint8_t dst_addr, uint8_t src_addr, uint32_t
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maple_sendFrame(cmd, dst_addr, src_addr, 4, tmp);
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}
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void maple_sendFrame_P(uint8_t cmd, uint8_t dst_addr, uint8_t src_addr, int data_len, PGM_P data)
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{
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unsigned char header_data[4];
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header_data[0] = data_len >> 2;
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header_data[1] = src_addr;
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header_data[2] = dst_addr;
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header_data[3] = cmd;
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// LRC is generated and sent by the function below.
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maple_sendRaw_P(header_data, data, data_len);
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}
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/*
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* data is in bus order
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*/
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void maple_sendFrame(uint8_t cmd, uint8_t dst_addr, uint8_t src_addr, int data_len, uint8_t *data)
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{
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uint8_t tmp[4 + data_len + 1]; // header, data and LRC
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//uint8_t *d;
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unsigned char tmp[4 + data_len + 1];
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uint8_t lrc=0;
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int i;
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int len = 4 + data_len + 1;
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tmp[0] = data_len >> 2;
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tmp[1] = src_addr;
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@ -433,6 +612,6 @@ void maple_sendFrame(uint8_t cmd, uint8_t dst_addr, uint8_t src_addr, int data_l
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tmp[i] = lrc;
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maple_sendRaw(tmp, sizeof(tmp));
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maple_sendRaw(tmp, len);
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}
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@ -42,4 +42,6 @@ int maple_receiveFrame(uint8_t *data, unsigned int maxlen);
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void maple_sendRaw(uint8_t *data, unsigned char len);
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void maple_sendFrame_P(uint8_t cmd, uint8_t dst_addr, uint8_t src_addr, int data_len, PGM_P data);
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#endif // _maplebus_h__
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1282
rxcode.asm
1282
rxcode.asm
File diff suppressed because it is too large
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