Dokumentation
pit.cc File Reference
Include dependency graph for pit.cc:Classes | |
| struct | PIT::Control.__unnamed70__ |
| I/O-port bitmap for the NMI Status and Control Register. More... | |
Namespaces | |
| namespace | PIT |
| Abstraction of the historical Programmable Interval Timer (PIT). | |
Enumerations | |
| enum | PIT::AccessMode { PIT::LATCH_COUNT_VALUE = 0 , PIT::LOW_BYTE_ONLY = 1 , PIT::HIGH_BYTE_ONLY = 2 , PIT::LOW_AND_HIGH_BYTE = 3 } |
| Access mode. More... | |
| enum | PIT::OperatingMode { PIT::INTERRUPT_ON_TERMINAL_COUNT = 0 , PIT::PROGRAMMABLE_ONE_SHOT = 1 , PIT::RATE_GENERATOR = 2 , PIT::SQUARE_WAVE_GENERATOR = 3 , PIT::SOFTWARE_TRIGGERED_STROBE = 4 , PIT::HARDWARE_TRIGGERED_STROBE = 5 } |
| Operating Mode. More... | |
| enum | PIT::Format { PIT::BINARY = 0 , PIT::BCD = 1 } |
| data format More... | |
Functions | |
| static IOPort | PIT::data (0x40+CHANNEL) |
| bool | PIT::set (uint16_t us) |
| Start timer. | |
| uint16_t | PIT::get (void) |
| Reads the current timer value. | |
| bool | PIT::isActive (void) |
| Check if the timer is running. | |
| bool | PIT::waitForTimeout (void) |
| (Active) waiting for timeout | |
| bool | PIT::delay (uint16_t us) |
| Set the timer and wait for timeout. | |
| void | PIT::pcspeaker (uint32_t freq) |
| Play a given frequency on the PC speaker. | |
| void | PIT::disable (void) |
| Deactivate the timer. | |
Constants | |
| const uint8_t | PIT::CHANNEL = 2 |
| static IOPort | PIT::mode_register (0x43) |
| static IOPort | PIT::controlRegister (0x61) |
| const uint64_t | PIT::BASE_FREQUENCY = 1193182ULL |
Class Documentation
| struct PIT::Control.__unnamed70__ |
I/O-port bitmap for the NMI Status and Control Register.
- Note
- Over time, the meaning of the bits stored at I/O port 0x61 changed; don't get the structure confused with old documentation on the IBM PC XT platform.
- See also
- Intel® I/O Controller Hub 7 (ICH7) Family, page 415
| Class Members | ||
|---|---|---|
| uint8_t | enable_timer_counter2: 1 | If enabled, the interrupt state will be visible at status_timer_counter2. |
| uint8_t | enable_speaker_data: 1 | If set, speaker output is equal to status_timer_counter2. |
| uint8_t | enable_pci_serr: 1 | not important, do not modify |
| uint8_t | enable_nmi_iochk: 1 | not important, do not modify |
| uint8_t | refresh_cycle_toggle: 1 | not important, must be 0 on write |
| uint8_t | status_timer_counter2: 1 | will be set on timer expiration; must be 0 on write |
| uint8_t | status_iochk_nmi_source: 1 | not important, must be 0 on write |
| uint8_t | status_serr_nmi_source: 1 | not important, must be 0 on write |