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N64.ino: Assorted low-hanging fruits

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More sizeof() use, avoiding high-level loops when a callee can do it
without the call overhead on every iteration, a bit of source code
factorisation, avoiding initializers for large variables.
This commit is contained in:
Vincent Pelletier 2022-10-28 14:16:21 +00:00
parent d9daadb1f9
commit bea06e55fe
1 changed files with 21 additions and 37 deletions
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58
Cart_Reader/N64.ino
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@ -1649,7 +1649,7 @@ void readMPK() {
}
// This will take 1300us
blinkLED();
myFile.write(sdBuffer, 512);
myFile.write(sdBuffer, sizeof(sdBuffer));
// Blink led
blinkLED();
// Update progress bar
@ -1870,12 +1870,12 @@ void verifyMPK() {
draw_progressbar(0, totalProgressBar);
// Controller paks, which all have 32kB of space, are mapped between 0x0000 – 0x7FFF
for (word currSdBuffer = 0x0000; currSdBuffer < 0x8000; currSdBuffer += 512) {
for (word currSdBuffer = 0x0000; currSdBuffer < 0x8000; currSdBuffer += sizeof(sdBuffer)) {
// Read 512 bytes into SD buffer
myFile.read(sdBuffer, 512);
myFile.read(sdBuffer, sizeof(sdBuffer));
// Compare 32 byte block
for (word currBlock = 0; currBlock < 512; currBlock += 32) {
for (word currBlock = 0; currBlock < sizeof(sdBuffer); currBlock += 32) {
// Read one block of the Controller Pak into array myBlock
readBlock(currSdBuffer + currBlock);
@ -2078,8 +2078,8 @@ void printCartInfo_N64() {
// look-up cart id in file n64.txt on sd card
void getCartInfo_N64() {
char tempStr2[2];
char tempStr[9];
int read_bytes;
// cart not in list
cartSize = 0;
@ -2101,26 +2101,18 @@ void getCartInfo_N64() {
// Skip over the CRC32 checksum
myFile.seekCur(9);
// Read 8 bytes into String, do it one at a time so byte order doesn't get mixed up
sprintf(tempStr, "%c", myFile.read());
for (byte i = 0; i < 7; i++) {
sprintf(tempStr2, "%c", myFile.read());
strcat(tempStr, tempStr2);
}
// Read 8 bytes into String
read_bytes = myFile.read(tempStr, 8);
tempStr[read_bytes == -1 ? 0 : read_bytes] = 0;
// Check if string is a match
if (strcmp(tempStr, checksumStr) == 0) {
// Skip the , in the file
myFile.seekCur(1);
// Read the next ascii character and subtract 48 to convert to decimal
cartSize = myFile.read() - 48;
// Remove leading 0 for single digit cart sizes
if (cartSize != 0) {
cartSize = cartSize * 10 + myFile.read() - 48;
} else {
cartSize = myFile.read() - 48;
}
read_bytes = myFile.read(tempStr, 2);
tempStr[read_bytes == -1 ? 0 : read_bytes] = 0;
cartSize = atoi(tempStr);
// Skip the , in the file
myFile.seekCur(1);
@ -2738,7 +2730,7 @@ void readEeprom() {
interrupts();
// Write 64 pages at once to the SD card
myFile.write(sdBuffer, 512);
myFile.write(sdBuffer, sizeof(sdBuffer));
}
// Close the file:
myFile.close();
@ -2797,7 +2789,7 @@ unsigned long verifyEeprom() {
interrupts();
// Check sdBuffer content against file on sd card
for (int c = 0; c < 512; c++) {
for (size_t c = 0; c < sizeof(sdBuffer); c++) {
if (myFile.read() != sdBuffer[c]) {
writeErrors++;
}
@ -3304,30 +3296,25 @@ redumpsamefolder:
print_Error(sd_error_STR, true);
}
// dumping rom slow
#ifndef fastcrc
// get current time
unsigned long startTime = millis();
#ifndef fastcrc
// dumping rom slow
for (unsigned long currByte = romBase; currByte < (romBase + (cartSize * 1024 * 1024)); currByte += 512) {
// Blink led
if (currByte % 16384 == 0)
if ((currByte & 0x3FFF) == 0)
blinkLED();
// Set the address for the next 512 bytes
setAddress_N64(currByte);
for (int c = 0; c < 512; c += 2) {
// split word
for (word c = 0; c < sizeof(sdBuffer); c += 2) {
word myWord = readWord_N64();
byte loByte = myWord & 0xFF;
byte hiByte = myWord >> 8;
// write to buffer
sdBuffer[c] = hiByte;
sdBuffer[c + 1] = loByte;
sdBuffer[c] = myWord >> 8;
sdBuffer[c + 1] = myWord & 0xFF;
}
myFile.write(sdBuffer, 512);
myFile.write(sdBuffer, sizeof(sdBuffer));
}
// Close the file:
myFile.close();
@ -3335,10 +3322,7 @@ redumpsamefolder:
if (compareCRC("n64.txt", 0, 1, 0)) {
#else
// dumping rom fast
byte buffer[1024] = { 0 };
// get current time
unsigned long startTime = millis();
byte buffer[1024];
//Initialize progress bar
uint32_t processedProgressBar = 0;