From 4d10e19afe45695f30e7bf408757e92893f3fd2c Mon Sep 17 00:00:00 2001 From: Nélio Laranjeiro Date: Sun, 10 Feb 2008 23:07:45 +0100 Subject: SPI driver for AVR. It's only a first shoot, it has not been tested in the real AVR. --- digital/avr/modules/spi/spi.c | 94 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 digital/avr/modules/spi/spi.c (limited to 'digital/avr/modules/spi/spi.c') diff --git a/digital/avr/modules/spi/spi.c b/digital/avr/modules/spi/spi.c new file mode 100644 index 00000000..e99055e0 --- /dev/null +++ b/digital/avr/modules/spi/spi.c @@ -0,0 +1,94 @@ +/* spi.c */ +/* {{{ + * + * Copyright (C) 2008 Nélio Laranjeiro + * + * APBTeam: + * Web: http://apbteam.org/ + * Email: team AT apbteam DOT org + * + * 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, or + * (at your option) any later version. + * + * 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 "spi.h" + +/** Spi driver context. */ +static spi_t spi_global; + +/** Initialise the SPI Control Register. + * \param sprc the sprc register data to be store in the register. + * \param cb the function call back to call the user which receive the data. + * \param user_data the user data to be provieded in the function call back. + */ +void +spi_init(uint8_t sprc, spi_recv_cb_t cb, void *user_data) +{ + SPRC = sprc; + spi_global.cb = cb; + spi_global.recv_user_data = user_data; +} + +/** Send a data to the Slave. + * \param data the data to send + * \param length the length of the data in bytes. + */ +void +spi_send(uint8_t *data, u8 length) +{ + uint i; + + for ( i = 0; i < length; i++) + { + // Insert the data in the data register, the SPI will begin to send it + // automatically. + SPDR = data[i]; + + // Wait the end of the transmission. + while(!(SPSR & (1<