Apple-2-HW/unified_retro_keyboard
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Initial cut of OSI 542 keyboard scan support

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This commit is contained in:
Dave 2020-04-27 17:10:13 -05:00
parent 80cb50eb7e
commit 8e2a12b9d5
2 changed files with 58 additions and 1 deletions
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50
firmware/asdf/src/Arch/asdf_arch_atmega2560.c
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@ -738,7 +738,55 @@ asdf_cols_t asdf_arch_read_row(uint8_t row)
ASDF_HIROW_PORT = rows >> 8;
ASDF_LOROW_PORT = rows & 0xff;
return (asdf_cols_t) ASDF_COLUMNS_PORT;
return (asdf_cols_t) ASDF_COLUMNS_PIN;
}
// PROCEDURE: asdf_arch_read_row
// INPUTS: (uint8_t) row: the row number to be scanned
// OUTPUTS: returns a word containing the active (pressed) columns
//
// DESCRIPTION: Outputs the argument to the ROW ports, then reads the column
// port and returns the value. The value is a binary representation of the keys
// pressed within the row, with 1=pressed, 0=released.
//
// SIDE EFFECTS: Sets ROW output port.
//
// NOTES:
//
// 1) The keymap represents an unpressed key as a "0" and a pressed key as a
// "1". So, if a keypress pulls the column line low, then the reading of the
// physical bits must be inverted.
//
// SCOPE: public
//
// COMPLEXITY: 1
//
asdf_cols_t asdf_arch_osi_read_row(uint8_t row)
{
asdf_cols_t cols;
if (row > 7) {
cols = asdf_arch_read_row(row);
} else {
// enable the OSI keyboard
clear_bit(&ASDF_OSI_KBE_PORT, ASDF_OSI_KBE_BIT);
// register the row to be read
ASDF_COLUMNS_DDR = ALL_OUTPUTS;
ASDF_COLUMNS_PORT = (1 << row);
clear_bit(&ASDF_OSI_RW_PORT, ASDF_OSI_RW_BIT);
set_bit(&ASDF_OSI_RW_PORT, ASDF_OSI_RW_BIT);
// Read in the columns
ASDF_COLUMNS_DDR = ALL_INPUTS;
return ASDF_COLUMNS_PIN;
ASDF_LOROW_PORT = row & 0xff;
cols = (asdf_cols_t) ASDF_COLUMNS_PORT;
}
return cols;
}

9
firmware/asdf/src/Arch/asdf_arch_atmega2560.h
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@ -318,6 +318,15 @@
#define ASDF_STROBE_DDR DDRB
#define ASDF_STROBE_BIT 4
#define ASDF_OSI_KBE_PORT ASDF_HIROW_PORT
#define ASDF_OSI_KBE_DDR ASDF_HIROW_DDR
#define ASDF_OSI_KBE_BIT 1
#define ASDF_OSI_RW_PORT ASDF_HIROW_PORT
#define ASDF_OSI_RW_DDR ASDF_HIROW_DDR
#define ASDF_OSI_RW_BIT 2
#define FUSE_INTERNAL_8MHZ_OSC_4MS (FUSE_CKSEL1 | FUSE_SUT0)
#define FUSE_INTERNAL_8MHZ_OSC_65MS (FUSE_CKSEL1 | FUSE_SUT1)
#define FUSE_XTAL_16MHZ_4MS (FUSE_CKSEL2 | FUSE_CKSEL1 | CKSEL0 | FUSE_SUT1)