| 0,0 → 1,86 |
|---|
| /**************************************************************************** |
| * Copyright (C) 2009 by Claas Anders "CaScAdE" Rathje * |
| * admiralcascade@gmail.com * |
| * Project-URL: http://www.mylifesucks.de/oss/c-osd/ * |
| * * |
| * This program 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 2 of the License. * |
| * * |
| * This program 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 this program; if not, write to the * |
| * Free Software Foundation, Inc., * |
| * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
| ****************************************************************************/ |
| |
| #include <avr/io.h> |
| #include <avr/interrupt.h> |
| #include "spi.h" |
| #include "main.h" |
| |
| volatile uint16_t icnt = 0; |
| volatile unsigned char * iptr; |
| volatile unsigned char spi_cmd_buffer[8]; |
| volatile uint8_t spi_ready = 1; |
| int16_t ampere = 0, max_ampere = 0; |
| int32_t ampere_wasted = 0; |
| |
| #define INT0_HIGH PORTD |= (1 << PD2); |
| #define INT0_LOW PORTD &= ~(1 << PD2); |
| |
| /** |
| * init the SPI as master |
| */ |
| void SpiMasterInit(void) { |
| volatile char IOReg; |
| // set PB4(/SS), PB5(MOSI), PB7(SCK) as output |
| DDRB = (1 << PB4) | (1 << PB5) | (1 << PB7); |
| PORTB |= (1 << PB4); // pullup SS |
| // enable SPI Interrupt and SPI in Master Mode with SCK = CK/128 |
| SPCR = (1 << SPIE) | (1 << SPE) | (1 << MSTR) | (1 << SPR0) | (1 << SPR1); |
| IOReg = SPSR; // clear SPIF bit in SPSR |
| IOReg = SPDR; |
| //sei(); // we do it later |
| } |
| |
| |
| /** |
| * SPI interrupt handler |
| */ |
| ISR(SPI_STC_vect) { |
| *iptr++ = SPDR; // safe received byte to buffer |
| icnt--; // dec length |
| if (icnt) { |
| //SPDR = *iptr; // send next byte |
| spi_ready = 1; // we _should_ send later because the slave needs more time |
| } else { |
| SPCR &= ~_BV(SPIE); // deactivate interrupt |
| INT0_HIGH // transfer is done, slave does not need to listen |
| } |
| } |
| |
| /** |
| * check if SPI transfer is still busy |
| */ |
| int TransferIsBusy(void) { |
| return SPCR & _BV(SPIE); |
| } |
| |
| /** |
| * start a new transfer of <data> with length <len> |
| */ |
| void StartTransfer(unsigned char *data, uint16_t len) { |
| INT0_LOW // /SS LOW ^= SS HIGH ^= slave should listen |
| |
| // set up pointer and length for interrupt handler |
| iptr = data; |
| icnt = len; |
| |
| SPCR |= _BV(SPIE); // enable spi interrupt |
| SPDR = *iptr; // start transfer by first bye |
| } |