From 586e2f5007ee6cf3632e6f29af16417a951b7c23 Mon Sep 17 00:00:00 2001
From: Brian Peek <brian@brianpeek.com>
Date: Sat, 9 Jul 2022 18:08:39 -0700
Subject: [PATCH] 2 serial modes + SD card

---
 src/main.cpp | 47 +++++++++++++++++++++++++++++++++++++----------
 1 file changed, 37 insertions(+), 10 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 97d4e60..db25f40 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,4 +1,6 @@
 #include <Arduino.h>
+#include <SPI.h>
+#include <SD.h>
 
 // forced to a 2mbit eprom
 // FLASHMEM
@@ -7,16 +9,12 @@
 
 #define ROM_BUFFER_LEN (256*1024)
 char buffer[ROM_BUFFER_LEN];
+const char *filename = "rom.bin";
 
-// v1 uses 30/31
-int32_t inPins[] = { 19,18,14,15,40,41,17,16,22,23,20,21,38,39,26,27,24,25,/*30,31,*/-1 };
+int32_t inPins[] = { 19,18,14,15,40,41,17,16,22,23,20,21,38,39,26,27,24,25,-1 };
 int32_t outPins[] = { 10,12,11,13,8,7,36,37,-1 };
 
-// v1
-//int32_t cePin = 30;
-//int32_t pgmPin = 31;
-
-void readFile()
+void readFile(int port)
 {
 	const int length = 1024;
 	char buff[length];
@@ -30,7 +28,17 @@ void readFile()
 	do
 	{
 		memset(buff, 0, length);
-		read = Serial.readBytes(buff, length);
+
+		switch(port)
+		{
+			case 0:
+				read = Serial.readBytes(buff, length);
+				break;
+			case 1:
+				read = Serial1.readBytes(buff, length);
+				break;		
+		}
+
 		total += read;
 		if(read > 0)
 		{
@@ -43,6 +51,12 @@ void readFile()
 	// on GG (and lynx?) top address bit gets stuck high (?) so mirror to upper region too?
 	if(total == 131072)
 		memcpy(p, buffer, 131072);
+
+	SD.remove(filename);
+
+	File f = SD.open(filename, O_WRITE);
+	f.write(buffer, ROM_BUFFER_LEN);
+	f.close();
 }
 
 void setPinMode(int32_t* pins, int32_t direction)
@@ -57,7 +71,17 @@ void setup()
 	setPinMode(outPins, OUTPUT);
 	GPIO7_DR = 0;
 
+	SD.begin(BUILTIN_SDCARD);
+
+	if(SD.exists(filename))
+	{
+		File f = SD.open(filename, O_READ);
+		f.read(buffer, f.size());
+		f.close();
+	}
+
 	Serial.begin(115200);
+	Serial1.begin(3000000);
 }
 
 void loop()
@@ -73,9 +97,12 @@ void loop()
 
 	// set data pins
 	outb = ((b & 0x0F) << 0) | ((b & 0xF0) << 12);
-
 	GPIO7_DR = outb;
 
+	// read file from either serial port, if available
 	if(Serial.available())
-		readFile();
+		readFile(0);
+
+	if(Serial1.available())
+		readFile(1);
 }