138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
//---
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//
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// gint core module: keyboard analyzer
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//
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// Probably the most difficult hardware interaction. There is very few
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// documentation on how the system actually analyzes the keyboard. While
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// disassembling syscalls reveals the following procedure (which was
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// already documented by SimonLothar), there is nothing about the
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// detection problems of the multi-getkey system.
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//
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//---
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#include <keyboard.h>
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#include <7705.h>
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//---
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// Keyboard management.
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//---
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/*
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kdelay()
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Used to be a low-level sleep using the watchdog, as in the system. This
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way seems OK at least, and it doesn't create column effects as for
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SH7305.
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*/
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static void kdelay(void)
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{
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#define r4(str) str str str str
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__asm__
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(
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r4("nop\n\t")
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);
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#undef r4
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/* Watchdog delay version.
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const int delay = 0xf4;
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// Disabling the watchdog timer interrupt and resetting the
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// configuration. Setting the delay.
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INTC.IPRB.BIT._WDT = 0;
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WDT.WTCSR.WRITE = 0xa500;
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WDT.WTCNT.WRITE = 0x5a00 | (delay & 0xff);
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// Counting on Po/256.
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WDT.WTCSR.WRITE = 0xa505;
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// Starting the timer (sets again to Po/256).
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WDT.WTCSR.WRITE = 0xa585;
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// Waiting until it overflows (delaying), then clearing the overflow
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// flag.
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while((WDT.WTCSR.READ.BYTE & 0x08) == 0);
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WDT.WTCSR.WRITE = 0xa500 | (WDT.WTCSR.READ.BYTE & 0xf7);
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// Resetting the configuration and the counter.
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WDT.WTCSR.WRITE = 0xa500;
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WDT.WTCSR.WRITE = 0x5a00;
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// Enabling back the watchdog timer interrupt.
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INTC.IPRB.BIT._WDT = GINT_INTP_WDT;
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*/
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}
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/*
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krow()
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Reads a keyboard row.
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*/
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static int krow(int row)
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{
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// '11' on the active row, '00' everywhere else.
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unsigned short smask = 0x0003 << ((row % 8) * 2);
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// '0' on the active row, '1' everywhere else.
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unsigned char cmask = ~(1 << (row % 8));
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// Line results.
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int result = 0;
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if(row < 0 || row > 9) return 0;
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// Initial configuration.
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PFC.PBCR.WORD = 0xaaaa;
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PFC.PMCR.WORD = (PFC.PMCR.WORD & 0xff00) | 0x0055;
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kdelay();
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if(row < 8)
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{
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// Configuring port B/M as input except for the row to check,
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// which has to be an output. This sets '01' (output) on the
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// active row, '10' (input) everywhere else.
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PFC.PBCR.WORD = 0xaaaa ^ smask;
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PFC.PMCR.WORD = (PFC.PMCR.WORD & 0xff00) | 0x00aa;
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kdelay();
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// Every bit set to 1 except the active row bit.
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PB.DR.BYTE = cmask;
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PM.DR.BYTE = (PM.DR.BYTE & 0xf0) | 0x0f;
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kdelay();
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}
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else
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{
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// The same, but deals with port M.
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PFC.PBCR.WORD = 0xaaaa;
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PFC.PMCR.WORD = ((PFC.PMCR.WORD & 0xff00) | 0x00aa) ^ smask;
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kdelay();
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PB.DR.BYTE = 0xff;
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PM.DR.BYTE = (PM.DR.BYTE & 0xf0) | cmask;
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kdelay();
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}
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// Reading the keyboard row.
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result = ~PA.DR.BYTE;
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kdelay();
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// Re-initializing the port configuration and data.
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PFC.PBCR.WORD = 0xaaaa;
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PFC.PMCR.WORD = (PFC.PMCR.WORD & 0xff00) | 0x00aa;
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kdelay();
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PFC.PBCR.WORD = 0x5555;
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PFC.PMCR.WORD = (PFC.PMCR.WORD & 0xff00) | 0x0055;
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kdelay();
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PB.DR.BYTE = 0x00;
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PM.DR.BYTE &= 0xf0;
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return result;
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}
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/*
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keyboard_updateState()
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Updates the keyboard state.
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*/
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void keyboard_updateState_7705(volatile unsigned char *keyboard_state)
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{
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int i;
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for(i = 0; i < 10; i++) keyboard_state[i] = krow(i);
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}
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