30 lines
510 B
C
30 lines
510 B
C
#include <msp430g2553.h>
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#include "spi.h"
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void __attribute__ ((interrupt (USCIAB0RX_VECTOR))) receive() {
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if (UC0IFG & UCB0RXIFG) {
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// receive an octet
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}
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}
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void spiInit() {
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// SPI slave
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// BIT4: UCB0STE
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// BIT5: UCB0CLK
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// BIT6: UCB0SOMI
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// BIT7: UCB0SIMO
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P1SEL |= BIT4 | BIT5 | BIT6 | BIT7;
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P1SEL2 |= BIT4 | BIT5 | BIT6 | BIT7;
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// most significant bit first, enable STE
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UCB0CTL0 = UCSYNC | UCMSB | UCMODE_2;
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UCB0CTL1 = 0x00;
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// enable RX interrupt
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UC0IE |= UCB0RXIE;
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}
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