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pc98: Fix glitch and reset signal

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- Change order of setting PORT and DDR to prevent glitch
- RST pin cannot be controlled after USART starts
This commit is contained in:
tmk 2022-02-14 16:59:53 +09:00
parent 85b69a7eab
commit 4ffa771f0f
1 changed files with 5 additions and 6 deletions
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11
converter/pc98_usb/matrix.c
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@ -123,15 +123,12 @@ RETRY:
void matrix_init(void)
{
PC98_RST_DDR |= (1<<PC98_RST_BIT);
PC98_RDY_DDR |= (1<<PC98_RDY_BIT);
PC98_RTY_DDR |= (1<<PC98_RTY_BIT);
PC98_RST_PORT |= (1<<PC98_RST_BIT);
PC98_RST_DDR |= (1<<PC98_RST_BIT);
PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
PC98_RDY_DDR |= (1<<PC98_RDY_BIT);
PC98_RTY_PORT |= (1<<PC98_RTY_BIT);
serial_init();
PC98_RTY_DDR |= (1<<PC98_RTY_BIT);
// PC98 reset
// https://archive.org/stream/PC9800TechnicalDataBookHARDWARE1993/PC-9800TechnicalDataBook_HARDWARE1993#page/n359
@ -140,6 +137,8 @@ void matrix_init(void)
_delay_us(15); // > 13us
PC98_RST_PORT |= (1<<PC98_RST_BIT); // RST: high
serial_init();
_delay_ms(50);
if (pc98_is_newtype()) xprintf("new type\n"); else xprintf("old type\n");
pc98_inhibit_repeat();