X-Git-Url: http://git.tdb.fi/?p=model-railway-devices.git;a=blobdiff_plain;f=firmware%2Fs88w-r.c;h=f64445d81c5a33f12b8f82ef1cae2ea21c7fba5d;hp=dac0cfcaf85948eeebd70f2eaebae030d9fe3ac6;hb=d8a31ed675778c08ca781beb62863c62d6f0bd94;hpb=af6a469f761ceec44e94bea5fe8e5345fd368966

diff --git a/firmware/s88w-r.c b/firmware/s88w-r.c
index dac0cfc..f64445d 100644
--- a/firmware/s88w-r.c
+++ b/firmware/s88w-r.c
@@ -25,6 +25,8 @@ D5 - S88 RESET
 
 #include <avr/io.h>
 #include <avr/interrupt.h>
+#include "lcd.h"
+#include "serial.h"
 
 #define DATA_OUT PORTD2
 #define CLOCK    PIND3
@@ -33,28 +35,33 @@ D5 - S88 RESET
 
 #define BIT(n)   (1<<(n))
 
+void receive(uint8_t);
+uint8_t hexdigit(uint8_t);
 uint8_t decode_hex(uint8_t);
 
-volatile uint8_t rx_buf[3];
-volatile uint8_t rx_fill = 0;
-volatile uint8_t input = 0;
-volatile uint8_t latch = 0;
+volatile uint8_t rx_buf[7];
+volatile uint8_t rx_fill = 0xFF;
+volatile uint8_t input[128] = { 0 };
+volatile uint8_t latch[128] = { 0 };
+uint8_t log_pos = 0;
 
 int main()
 {
 	uint8_t clock_high = 0;
 	uint8_t bits = 0;
+	uint8_t n_bits = 8;
+	uint8_t offset = 0;
 
 	DDRD = 0x06;  // 00000110
 	PIND = 0xC0;  // 11000000
 	DDRB = 0x20;  // 00100000
 	PINB = 0x1F;  // 00011111
 
-	// 9600 baud, 8N1
-	UBRR0H = 0;
-	UBRR0L = 103;
-	UCSR0C = BIT(UCSZ00) | BIT(UCSZ01);
-	UCSR0B = BIT(RXEN0) | BIT(TXEN0) | BIT(RXCIE0);
+	serial_init(9600);
+	serial_set_callback(receive);
+	lcd_init();
+	lcd_on();
+	lcd_clear();
 
 	sei();
 
@@ -69,9 +76,21 @@ int main()
 			if(!clock_high)
 			{
 				if(d_pins&BIT(LOAD))
-					bits = latch;
+				{
+					offset = 0;
+					bits = latch[0];
+					n_bits = 8;
+				}
 				else
+				{
 					bits >>= 1;
+					if(!--n_bits)
+					{
+						++offset;
+						bits = latch[offset];
+						n_bits = 8;
+					}
+				}
 
 				if(bits&1)
 					PORTD |= BIT(DATA_OUT);
@@ -85,28 +104,77 @@ int main()
 			clock_high = 0;
 
 		if(d_pins&BIT(RESET))
-			latch = input;
+		{
+			uint8_t i;
+			for(i=0; i<128; ++i)
+				latch[i] = input[i];
+		}
 	}
 }
 
-ISR(USART_RX_vect)
+void receive(uint8_t c)
 {
-	uint8_t c = UDR0;
-	if(rx_fill==0)
+	if(rx_fill==0xFF)
 	{
 		if(c==':')
-			rx_buf[rx_fill++] = c;
+			rx_fill = 0;
 	}
-	else
+	else if(c=='.')
 	{
-		rx_buf[rx_fill++] = c;
-		if(rx_buf[0]==':' && rx_fill==3)
+		if(rx_fill>=4)
 		{
-			input = (decode_hex(rx_buf[1])<<4) | decode_hex(rx_buf[2]);
-			latch |= input;
-			rx_fill = 0;
+			uint16_t offset;
+			uint8_t nibbles;
+			uint8_t i;
+
+			offset = (decode_hex(rx_buf[0])<<8) | (decode_hex(rx_buf[1])<<4) | decode_hex(rx_buf[2]);
+			nibbles = (offset&3);
+			offset >>= 2;
+			if(rx_fill>3+nibbles)
+			{
+				for(i=0; i<=nibbles; ++i)
+				{
+					uint16_t j = offset+nibbles-i;
+					uint8_t shift = 4*(j&1);
+					uint8_t bits = decode_hex(rx_buf[3+i]);
+					input[j/2] = (input[j/2]&~(0xF<<shift)) | (bits<<shift);
+					latch[j/2] = input[j/2];
+				}
+			}
+
+			lcd_gotoxy(0, 0);
+			for(i=10; i--;)
+			{
+				lcd_write(hexdigit(input[i]>>4));
+				lcd_write(hexdigit(input[i]));
+			}
 		}
+		rx_fill = 0xFF;
+	}
+	else
+	{
+		if(rx_fill<sizeof(rx_buf))
+			rx_buf[rx_fill++] = c;
+		else
+			rx_fill = 0xFF;
 	}
+
+	lcd_gotoxy(log_pos%20, 1+log_pos/20);
+	lcd_write(c);
+	++log_pos;
+	if(log_pos>=60)
+		log_pos = 0;
+	lcd_gotoxy(log_pos%20, 1+log_pos/20);
+	lcd_write(255);
+}
+
+uint8_t hexdigit(uint8_t n)
+{
+	n &= 0xF;
+	if(n<10)
+		return '0'+n;
+	else
+		return 'A'+(n-0xA);
 }
 
 uint8_t decode_hex(uint8_t c)