spkmodem.c File Reference

#include <arch/io.h>
#include <console/spkmodem.h>

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Macros
#define	SPEAKER_PIT_FREQUENCY   0x1234dd

Enumerations
enum	{   PIT_COUNTER_0 = 0x40 , PIT_COUNTER_1 = 0x41 , PIT_COUNTER_2 = 0x42 , PIT_CTRL = 0x43 ,   PIT_SPEAKER_PORT = 0x61 }
enum	{ PIT_SPK_TMR2 = 0x01 , PIT_SPK_DATA = 0x02 , PIT_SPK_TMR2_LATCH = 0x20 }
enum	{   PIT_CTRL_SELECT_MASK = 0xc0 , PIT_CTRL_SELECT_0 = 0x00 , PIT_CTRL_SELECT_1 = 0x40 , PIT_CTRL_SELECT_2 = 0x80 ,   PIT_CTRL_READLOAD_MASK = 0x30 , PIT_CTRL_COUNTER_LATCH = 0x00 , PIT_CTRL_READLOAD_LSB = 0x10 , PIT_CTRL_READLOAD_MSB = 0x20 ,   PIT_CTRL_READLOAD_WORD = 0x30 , PIT_CTRL_MODE_MASK = 0x0e , PIT_CTRL_INTR_ON_TERM = 0x00 , PIT_CTRL_PROGR_ONE_SHOT = 0x02 ,   PIT_CTRL_RATE_GEN = 0x04 , PIT_CTRL_SQUAREWAVE_GEN = 0x06 , PIT_CTRL_SOFTSTROBE = 0x08 , PIT_CTRL_HARDSTROBE = 0x0a ,   PIT_CTRL_COUNT_MASK = 0x01 , PIT_CTRL_COUNT_BINARY = 0x00 , PIT_CTRL_COUNT_BCD = 0x01 }

Functions
static void	make_tone (uint16_t freq_count, unsigned int duration)
void	spkmodem_tx_byte (unsigned char c)
void	spkmodem_init (void)

Macro Definition Documentation

SPEAKER_PIT_FREQUENCY

#define SPEAKER_PIT_FREQUENCY   0x1234dd

Definition at line 6 of file spkmodem.c.

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
PIT_COUNTER_0
PIT_COUNTER_1
PIT_COUNTER_2
PIT_CTRL
PIT_SPEAKER_PORT

Definition at line 8 of file spkmodem.c.

anonymous enum

anonymous enum

Enumerator
PIT_SPK_TMR2
PIT_SPK_DATA
PIT_SPK_TMR2_LATCH

Definition at line 16 of file spkmodem.c.

anonymous enum

anonymous enum

Enumerator
PIT_CTRL_SELECT_MASK
PIT_CTRL_SELECT_0
PIT_CTRL_SELECT_1
PIT_CTRL_SELECT_2
PIT_CTRL_READLOAD_MASK
PIT_CTRL_COUNTER_LATCH
PIT_CTRL_READLOAD_LSB
PIT_CTRL_READLOAD_MSB
PIT_CTRL_READLOAD_WORD
PIT_CTRL_MODE_MASK
PIT_CTRL_INTR_ON_TERM
PIT_CTRL_PROGR_ONE_SHOT
PIT_CTRL_RATE_GEN
PIT_CTRL_SQUAREWAVE_GEN
PIT_CTRL_SOFTSTROBE
PIT_CTRL_HARDSTROBE
PIT_CTRL_COUNT_MASK
PIT_CTRL_COUNT_BINARY
PIT_CTRL_COUNT_BCD

Definition at line 22 of file spkmodem.c.

Function Documentation

make_tone()

static void make_tone ( uint16_t  freq_count, unsigned int  duration  )

static

Definition at line 51 of file spkmodem.c.

References inb(), outb(), PIT_COUNTER_2, PIT_CTRL, PIT_CTRL_COUNT_BINARY, PIT_CTRL_READLOAD_WORD, PIT_CTRL_SELECT_2, PIT_CTRL_SQUAREWAVE_GEN, PIT_SPEAKER_PORT, PIT_SPK_DATA, and PIT_SPK_TMR2.

Referenced by spkmodem_tx_byte().

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spkmodem_init()

void spkmodem_init

(

void

)

Definition at line 96 of file spkmodem.c.

References spkmodem_tx_byte().

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spkmodem_tx_byte()

void spkmodem_tx_byte

(

unsigned char

c

)

Definition at line 81 of file spkmodem.c.

References c, make_tone(), and SPEAKER_PIT_FREQUENCY.

Referenced by spkmodem_init().

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