Array Error

[rp181]

I am getting an error i have never gotten before, "error: source array smaller than destination for argument 1 of `readFrame'"

code:

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char data[256][128];
readFrame(data,opf); //the line giving the error

header:

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void readFrame(int buffer[256][128], OpticalFlow &opf);

function:

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void readFrame(int buffer[256][128], OpticalFlow &opf) {
	if (init_type == 1) {
		readLogFrame(buffer, opf);
	} else {
		readLinFrame(buffer, opf);
	}
}

readLogFrame:

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void readLogFrame(int buffer[256][128], OpticalFlow &opf) {

	int x;
	int y;
	int tmp;
	for (y = 0; y < 128; y++) {
		sendToOpticFlow(ROWSEL, y, opf); // Select row
		delay(3);
		for (x = 0; x < 256; x++) {
			sendToOpticFlow(ADCOP, 0, opf); // Reset ADC
			sendToOpticFlow(COLSEL, x, opf); // Select column
			delay_us(3);
			sendToOpticFlow(ADCOP, 1, opf); // Start ADC conversion
			tmp = readOpticFlow(opf);
			buffer[x][y] = tmp;

		}

	}
}

[segher]

readFrame() wants an int[][], you're passing it a char[][].

int[256][128] will not fit in memory, btw.