From b25c1563dd26223fc0041055bd7fe7e65776bd8b Mon Sep 17 00:00:00 2001 From: Michel Pollet Date: Wed, 14 Sep 2011 09:19:15 +0100 Subject: [PATCH] lin: Added module - added core module for atmega16m1, standard peripherals and LIN-in-UART mode Signed-off-by: Markus Lampert Signed-off-by: Michel Pollet --- simavr/sim/avr_lin.c | 100 +++++++++++++++++++++++++++++++++++++++++++ simavr/sim/avr_lin.h | 47 ++++++++++++++++++++ 2 files changed, 147 insertions(+) create mode 100644 simavr/sim/avr_lin.c create mode 100644 simavr/sim/avr_lin.h diff --git a/simavr/sim/avr_lin.c b/simavr/sim/avr_lin.c new file mode 100644 index 0000000..6e41219 --- /dev/null +++ b/simavr/sim/avr_lin.c @@ -0,0 +1,100 @@ +/* + avr_lin.h + + Copyright 2008, 2011 Michel Pollet + Copyright 2011 Markus Lampert + + This file is part of simavr. + + simavr is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + simavr is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with simavr. If not, see . + */ + +#include +#include "avr_lin.h" + + +static void +avr_lin_baud_write( + struct avr_t *avr, + avr_io_addr_t addr, + uint8_t v, + void *param) +{ + avr_lin_t *p = (avr_lin_t*) param; + + if (p->r_linbtr != p->ldisr.reg || p->r_linbtr != p->lbt.reg) { // sanity check + printf("Error: LDISR and LBT[x] register different!\n"); + return; + } + + printf("LIN addr[%04x] = %02x\n", addr, v); + if (addr == p->ldisr.reg) { + if (avr_regbit_get(avr, p->lena)) { + printf("Warning: LENA bit set on changing LBTR\n"); + return; + } + if ((v >> p->ldisr.bit) & p->ldisr.mask) { + uint8_t lbt = (v >> p->lbt.bit) & p->lbt.mask; + uint8_t ov = v; + v = (1 << p->ldisr.bit) | (lbt << p->lbt.bit); + printf("LIN: v=%02x -> LBT = %02x -> LINBT = %02x\n", ov, lbt, v); + } else { + v = 0x20; + } + } + avr_core_watch_write(avr, addr, v); // actually set the value + + uint32_t lbt = avr_regbit_get(avr, p->lbt); + uint32_t lbrr = (avr->data[p->r_linbrrh] << 8) | avr->data[p->r_linbrrl]; + printf("LIN-UART LBT/LBRR to %04x/%04x\n", lbt, lbrr); + uint32_t baud = avr->frequency / (lbt * (lbrr + 1)); + uint32_t word_size = 1 /*start*/+ 8 /*data bits*/+ 1 /*parity*/+ 1 /*stop*/; + + printf("LIN-UART configured to %04x/%04x = %d bps, 8 data 1 stop\n", lbt, + lbrr, baud); + + p->uart.usec_per_byte = 1000000 / (baud / word_size); + printf("Roughtly %d usec per bytes\n", (int) p->uart.usec_per_byte); +} + +static void +avr_lin_reset( + avr_io_t *port) +{ + printf("LIN-UART: reset\n"); + avr_lin_t *p = (avr_lin_t*) port; + avr_t * avr = p->io.avr; + + p->uart.io.reset(&p->uart.io); + avr->data[p->r_linbtr] = 0x20; +} + +static avr_io_t _io = { + .kind = "lin", + .reset = avr_lin_reset, +}; + +void +avr_lin_init( + avr_t *avr, + avr_lin_t *p) +{ + // init uart part + avr_uart_init(avr, &p->uart); + + p->io = _io; + avr_register_io_write(avr, p->r_linbtr, avr_lin_baud_write, p); + avr_register_io_write(avr, p->r_linbrrl, avr_lin_baud_write, p); + avr->data[p->r_linbtr] = 0x20; +} diff --git a/simavr/sim/avr_lin.h b/simavr/sim/avr_lin.h new file mode 100644 index 0000000..b27c88d --- /dev/null +++ b/simavr/sim/avr_lin.h @@ -0,0 +1,47 @@ +/* + avr_lin.h + + Copyright 2008, 2011 Michel Pollet + Copyright 2011 Markus Lampert + + This file is part of simavr. + + simavr is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + simavr is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with simavr. If not, see . + */ + +#ifndef __AVR_LIN_H__ +#define __AVR_LIN_H__ + +#include "sim_avr.h" +#include "avr_uart.h" + +typedef struct avr_lin_t { + avr_io_t io; + + avr_io_addr_t r_linbtr; + avr_io_addr_t r_linbrrh, r_linbrrl; + + avr_regbit_t lena; + avr_regbit_t ldisr; + avr_regbit_t lbt; + + avr_uart_t uart; // used when LIN controller is setup as a UART +} avr_lin_t; + +void +avr_lin_init( + avr_t *avr, + avr_lin_t *port); + +#endif /* __AVR_LIN_H__ */ -- 2.39.5