avr_mdcart_sram_lite
changeset 7:f14e14abe14c tip
delays?
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Mon, 13 Mar 2017 01:10:57 +0200 |
| parents | ff8af8351282 |
| children | |
| files | main.c |
| diffstat | 1 files changed, 3 insertions(+), 1 deletions(-) [+] |
line diff
1.1 --- a/main.c Sun Mar 12 23:43:41 2017 +0200 1.2 +++ b/main.c Mon Mar 13 01:10:57 2017 +0200 1.3 @@ -190,9 +190,11 @@ 1.4 1.5 /* no need for DDRB change, we drive the bus by default in programming mode */ 1.6 PORTB = val; /* set data */ 1.7 + _delay_us(0.1); 1.8 1.9 /* pulse WE */ 1.10 PORTD &= ~WE_BIT; 1.11 + _delay_us(0.1); 1.12 /* WE should be low for at least 9ns, which is way faster than we can toggle it anyway */ 1.13 PORTD |= WE_BIT; 1.14 } 1.15 @@ -207,7 +209,7 @@ 1.16 1.17 DDRB = 0; /* release the data bus */ 1.18 PORTD &= ~OE_BIT; /* assert OE (output enable) */ 1.19 - _delay_us(0.1); 1.20 + _delay_us(1); 1.21 val = PINB; /* read the data */ 1.22 PORTD |= OE_BIT; /* deassert OE */ 1.23 DDRB = 0xff; /* take back the bus */