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Diffstat (limited to 'docs/TECH')
-rw-r--r-- | docs/TECH | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -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6 | [Most, if not all, of this document is completely outdated. You should rather | 6 | [Most, if not all, of this document is completely outdated.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 | Â 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 |