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@@ -6,7 +6,7 @@ Background
6 [Most, if not all, of this document is completely outdated. You should rather 6 [Most, if not all, of this document is completely outdated. You should rather
7 hunt down this info in the Rockbox wiki or source code!] 7 hunt down this info in the Rockbox wiki or source code!]
8 8
9 Björn Stenberg started this venture back in the late year 2001. The first 9 Björn Stenberg started this venture back in the late year 2001. The first
10 Rockbox code was committed to CVS end of March 2002. Rockbox 1.0 was 10 Rockbox code was committed to CVS end of March 2002. Rockbox 1.0 was
11 released in June. 11 released in June.
12 12
@@ -54,7 +54,7 @@ Playing MPEG
54 54
55 The DEMAND signal is connected to a port pin on the CPU which can generate 55 The DEMAND signal is connected to a port pin on the CPU which can generate
56 an IRQ, but only on the falling edge. That means that the mpeg driver code 56 an IRQ, but only on the falling edge. That means that the mpeg driver code
57  must poll the DEMAND signal every ms to keep the MAS happy. The mpeg code 57  must poll the DEMAND signal every ms to keep the MAS happy. The mpeg code
58 does use the IRQ to detect the falling edge when the MAS is "full". 58 does use the IRQ to detect the falling edge when the MAS is "full".
59 59
60 Unfortunately, the serial port on the CPU sends the LSB first, and the MAS 60 Unfortunately, the serial port on the CPU sends the LSB first, and the MAS