diff options
Diffstat (limited to 'payloads/libpayload/drivers/speaker.c')
| -rw-r--r-- | payloads/libpayload/drivers/speaker.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/payloads/libpayload/drivers/speaker.c b/payloads/libpayload/drivers/speaker.c index 3b3a750318c5..3a561bcbface 100644 --- a/payloads/libpayload/drivers/speaker.c +++ b/payloads/libpayload/drivers/speaker.c @@ -60,13 +60,15 @@ */ void speaker_enable(u16 freq) { + u16 reg16 = 1193180 / freq; + /* Select counter 2. Read/write LSB first, then MSB. Use mode 3 (square wave generator). Use a 16bit binary counter. */ outb(0xb6, I82C54_CONTROL_WORD_REGISTER); /* Set the desired tone frequency. */ - outb((u8)(freq & 0x00ff), I82C54_COUNTER2); /* LSB. */ - outb((u8)(freq >> 8), I82C54_COUNTER2); /* MSB. */ + outb((u8)(reg16 & 0x00ff), I82C54_COUNTER2); /* LSB. */ + outb((u8)(reg16 >> 8), I82C54_COUNTER2); /* MSB. */ /* Enable the PC speaker (set bits 0 and 1). */ outb(inb(PC_SPEAKER_PORT) | 0x03, PC_SPEAKER_PORT); |