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Update SMS.ino

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sanni 2019-09-20 11:16:53 +02:00
parent 4555ce1da7
commit 4a2d3d81dc
1 changed files with 23 additions and 12 deletions
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35
Cart_Reader/SMS.ino
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@ -54,17 +54,23 @@ void setup_SMS() {
//A8-A15
DDRK = 0xFF;
// Set Control Pins to Output RST(PH0) CS(PH3) WR(PH5) OE(PH6)
DDRH |= (1 << 0) | (1 << 3) | (1 << 5) | (1 << 6);
// Set Control Pins to Output RST(PH0) WR(PH5) OE(PH6)
DDRH |= (1 << 0) | (1 << 5) | (1 << 6);
// CE(PL1)
DDRL |= (1 << 1);
// Setting RST(PH0) CS(PH3) WR(PH5) OE(PH6) HIGH
PORTH |= (1 << 0) | (1 << 3) | (1 << 5) | (1 << 6);
// Setting RST(PH0) WR(PH5) OE(PH6) HIGH
PORTH |= (1 << 0) | (1 << 5) | (1 << 6);
// CE(PL1)
PORTL |= (1 << 1);
// ROM has 16KB banks which can be mapped to one of three slots via register writes
// Register Slot Address space
// $fffd 0 $0000-$3fff
// $fffe 1 $4000-$7fff
// $ffff 2 $8000-$bfff
// Disable sram
writeByte_SMS(0xFFFC, 0);
// Map first 3 banks so we can read-out the header info
writeByte_SMS(0xFFFD, 0);
writeByte_SMS(0xFFFE, 1);
@ -82,6 +88,7 @@ void setup_SMS() {
void writeByte_SMS(word myAddress, byte myData) {
// Set Data Pins (D0-D15) to Output
DDRC = 0xFF;
// Set address
PORTF = myAddress & 0xFF;
PORTK = (myAddress >> 8) & 0xFF;
@ -92,14 +99,16 @@ void writeByte_SMS(word myAddress, byte myData) {
// Wait till output is stable
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Switch CS(PH3) and WR(PH5) to LOW
PORTH &= ~((1 << 3) | (1 << 5));
// Switch CE(PL1) and WR(PH5) to LOW
PORTL &= ~(1 << 1) ;
PORTH &= ~(1 << 5);
// Leave WE low for at least 60ns
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Switch CS(PH3) and WR(PH5) to HIGH
PORTH |= (1 << 3) | (1 << 5);
// Switch CE(PL1) and WR(PH5) to HIGH
PORTH |= (1 << 5);
PORTL |= (1 << 1);
// Leave WE high for at least 50ns
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
@ -118,16 +127,18 @@ byte readByte_SMS(word myAddress) {
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Switch CS(PH3) and OE(PH6) to LOW
PORTH &= ~((1 << 3) | (1 << 6));
// Switch CE(PL1) and OE(PH6) to LOW
PORTL &= ~(1 << 1);
PORTH &= ~(1 << 6);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Read
byte tempByte = PINC;
// Switch CS(PH3) and OE(PH6) to HIGH
PORTH |= (1 << 3) | (1 << 6);
// Switch CE(PL1) and OE(PH6) to HIGH
PORTH |= (1 << 6);
PORTL |= (1 << 1);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");