Difference between revisions of "84PCE:Ports:A000"
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[[Category:84PCE:Ports:By_Address|A000 - Keyboard]] [[Category:84PCE:Ports:By_Name|Keyboard]] | [[Category:84PCE:Ports:By_Address|A000 - Keyboard]] [[Category:84PCE:Ports:By_Name|Keyboard]] | ||
== Synopsis == | == Synopsis == | ||
| − | '''Port Number:''' A000- | + | '''Port Number:''' A000-? |
| − | '''Memory-mapped address:''' F50000- | + | '''Memory-mapped address:''' F50000-? |
'''Function:''' Set the mode of the keypad controller | '''Function:''' Set the mode of the keypad controller | ||
| + | |||
| + | F50000 (R/W): | ||
Bits 0-1: Scan mode | Bits 0-1: Scan mode | ||
| Line 21: | Line 23: | ||
Bits 16-31: Number of APB cycles to wait between scans | Bits 16-31: Number of APB cycles to wait between scans | ||
| + | |||
| + | F50004 (R/W): | ||
| + | Bits 0-7: Number of rows to read (later rows are not updated in F50010-F5002F, and just read as whatever they were before being disabled) | ||
| + | |||
| + | Bits 8-15: Number of columns to read (later column bits in a row are set to 1 when it is updated) | ||
| + | |||
| + | F50008 (R/W): Keypad interrupt status/acknowledge (3-bit). Write "1" bits to acknowledge. | ||
| + | |||
| + | *Bit 0: Keypad scan complete | ||
| + | |||
| + | *Bit 1: Keypad data register changed | ||
| + | |||
| + | *Bit 2: Key pressed in mode 1 | ||
| + | |||
| + | F5000C (R/W): Keypad interrupt mask (3-bit). Set each bit to 1 if the corresponding event in [F50008] should cause an interrupt. | ||
| + | |||
| + | F50010-F5002F (R): Keypad data, one halfword per row. | ||
| + | |||
| + | F50030-F5003F (R/W): Keypad GPIOs. Each register is 20 bits, with one bit per GPIO. The role of each register is unknown. | ||
Revision as of 02:33, 31 March 2015
Synopsis
Port Number: A000-?
Memory-mapped address: F50000-?
Function: Set the mode of the keypad controller
F50000 (R/W):
Bits 0-1: Scan mode
- Mode 0: Idle.
- Mode 1: Indiscriminate key detection. Data registers are not updated, but whenever any key is pressed, interrupt bit 2 is set (and cannot be cleared until the key is released).
- Mode 2: Single scan. The keypad is scanned once, and then the mode returns to 0.
- Mode 3: Continuous scan. When scanning completes, it just starts over again after a delay.
Bits 2-15: Number of APB cycles to wait before scanning each row
Bits 16-31: Number of APB cycles to wait between scans
F50004 (R/W): Bits 0-7: Number of rows to read (later rows are not updated in F50010-F5002F, and just read as whatever they were before being disabled)
Bits 8-15: Number of columns to read (later column bits in a row are set to 1 when it is updated)
F50008 (R/W): Keypad interrupt status/acknowledge (3-bit). Write "1" bits to acknowledge.
- Bit 0: Keypad scan complete
- Bit 1: Keypad data register changed
- Bit 2: Key pressed in mode 1
F5000C (R/W): Keypad interrupt mask (3-bit). Set each bit to 1 if the corresponding event in [F50008] should cause an interrupt.
F50010-F5002F (R): Keypad data, one halfword per row.
F50030-F5003F (R/W): Keypad GPIOs. Each register is 20 bits, with one bit per GPIO. The role of each register is unknown.
