Steve Karg
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/**************************************************************************
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*
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* Copyright (C) 2009 Steve Karg <skarg@users.sourceforge.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*********************************************************************/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "hardware.h"
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#include "spi-master.h"
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void spi_master_init(void)
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{
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/* SS, MOSI, MISO, SCK */
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DDRB=(1<<PINB4)|(1<<PINB5)|(0<<PINB6)|(1<<PINB7);
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/* Enable SPI, Master, Clk/128 */
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SPCR=(1<<SPR0)|(1<<SPR1)|(1<<MSTR)|(0<<DORD)|(1<<SPE)|(0<<SPIE);
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power_spi_enable();
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}
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uint8_t spi_master_transfer(
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uint8_t txdata)
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{
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/* Send SPI data */
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SPDR = txdata;
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/* Wait for transmission complete */
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while(!(SPSR & (1<<SPIF))) {
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/* do nothing */
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}
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return SPDR;
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}
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#ifdef TEST_SPI_MASTER
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uint8_t Data_Register;
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int main(void)
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{
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spi_master_init();
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while(1)
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{
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/* loopback test */
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Data_Register = spi_master_transfer(0xBA);
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}
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}
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#endif
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