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avr: started working on hw interface for uart0.

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This commit is contained in:
Martin Preuss
2025-02-26 21:00:09 +01:00
parent 8968f14122
commit bebc4c1b0d
5 changed files with 509 additions and 21 deletions
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19
avr/devices/t03/defs.asm
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@@ -16,7 +16,7 @@
; PB0 2 13 PA0 ATTN0
; PB1 3 12 PA1 TXD0 (UART0)
; /RESET PB3 4 11 PA2 RXD0 (UART0)
; LED PB2 5 10 PA3 ATTN1
; LED PB2 5 10 PA3
; 1-wire PA7 6 9 PA4 RXD1 (UART1) [SCK, PRG]
; [MOSI,PRG] SDA (I2C) PA6 7 8 PA5 TXD1 (UART1) [MISO, PRG]
; -------
@@ -51,33 +51,18 @@
; ---------------------------------------------------------------------------
; COM module
.equ COM_BIT_LENGTH = 52000 ; 104000ns=9600, 52000ns=19200, 26000ns=38400
.equ COM_HALFBIT_LENGTH = 26000 ; see https://de.wikipedia.org/wiki/Universal_Asynchronous_Receiver_Transmitter
.equ COM_DATA_DDR = DDRA
.equ COM_DATA_INPUT = PINA
.equ COM_DATA_OUTPUT = PORTA
.equ COM_DATA_PIN = PORTA2
.equ COM_ATTN_DDR = DDRA
.equ COM_ATTN_INPUT = PINA
.equ COM_ATTN_OUTPUT = PORTA
.equ COM_ATTN_PIN = PORTA0
.equ COM_IRQ_ADDR_ATTN = PCMSK0
.equ COM_IRQ_BIT_ATTN = PCINT0 ; bit 7 in PCMSK0
.equ COM_IRQ_BIT_ATTN = PCINT0 ; bit 0 in PCMSK0
.equ COM_IRQ_GIFR_ATTN = PCIF0
.equ COM_IRQ_GIMSK_ATTN = PCIE0
; ---------------------------------------------------------------------------
; LCD module
.equ LCD_TWI_ADDRESS = 0x3c
; ---------------------------------------------------------------------------
; 1-Wire Master
;