christoph/lecture-operating-system-development
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add vorgabe09

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This commit is contained in:
Christoph Urlacher
2022-07-04 16:17:39 +02:00
parent 586fe3bb80
commit da6c5ab0b5
13 changed files with 231 additions and 40 deletions
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22
c_os/devices/PCSPK.cc
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@ -84,28 +84,6 @@ inline void PCSPK::delay(int time) {
/* Hier muess Code eingefuegt werden */
// 1.19 MHz => 1s for full countdown
unsigned short cntStart = 1193180 / 1000; // 1s / 1000 = 1ms countdown
// 00110000 => 0x30: Counter0, LoByte/HiByte, Mode0, Binary
// 00110010 => 0x32: Counter0, LoByte/HiByte, Mode1, Binary
// 00110100 => 0x34: Counter0, LoByte/HiByte, Mode2, Binary
// 00110110 => 0x36: Counter0, LoByte/HiByte, Mode3, Binary
control.outb(0x34); // Zaehler-0 konfigurieren
data0.outb(cntStart & 0xFF); // Zaehler-0 laden (Lobyte)
data0.outb(cntStart >> 8); // Zaehler-0 laden (Hibyte)
int initial_count, current_count;
for (int i = 0; i < time; ++i) {
initial_count = readCounter();
while (1) {
current_count = readCounter();
if (current_count > initial_count) break; // The counter has already been reset
initial_count = current_count;
}
}
}
/*****************************************************************************