Revision 844
Added some debug statements which SHOULD BE REMOVED UPON MOVING TO TRUNK
| spi.c | ||
|---|---|---|
| 18 | 18 |
void spi_init (spi_fun_recv_t recv_func, spi_fun_recv_complete_t recv_complete_func) |
| 19 | 19 |
{
|
| 20 | 20 |
/* Enable Interrupt, Enable SPI Module, MSB First, Master Mode, Clock div = 64 */ |
| 21 |
SPCR = _BV(SPE) | _BV(SPIE) /*| _BV(DORD)*/ | _BV(MSTR) | _BV(SPR1) | _BV(SPR0); |
|
| 21 |
SPCR = _BV(SPE) | _BV(SPIE) /*| _BV(DORD)*/ | _BV(MSTR) | _BV(SPR1) | _BV(SPR0);
|
|
| 22 | 22 |
SPSR = _BV(SPI2X); |
| 23 | 23 |
|
| 24 | 24 |
/* Set SCLK, SS, MOSI as outputs. MISO as input */ |
| ... | ... | |
| 30 | 30 |
|
| 31 | 31 |
/* set function to be executed when we receive a byte */ |
| 32 | 32 |
spi_recv_func = recv_func; |
| 33 |
spi_recv_complete_func = recv_complete_func;
|
|
| 33 |
spi_recv_complete_func = recv_complete_func;
|
|
| 34 | 34 |
spi_bytes = 0; |
| 35 |
usb_puts("\tspi.c Debug: SPI INITIALIZED\n");
|
|
| 35 | 36 |
} |
| 36 | 37 |
|
| 37 | 38 |
/* Transfer a given byte to slave and receive a byte */ |
| ... | ... | |
| 48 | 49 |
/* only handle intterupt when we are expecting data */ |
| 49 | 50 |
if(spi_bytes > 0){
|
| 50 | 51 |
/* process byte */ |
| 51 |
spi_recv_func(SPDR);
|
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| 52 |
spi_recv_func(SPDR);
|
|
| 52 | 53 |
/* if we've read all the bytes, set SS high to end transmission, |
| 53 | 54 |
* otherwise get the next byte */ |
| 54 | 55 |
if(--spi_bytes == 0){
|
| 55 | 56 |
//usb_puts("Read all bytes\r\n");
|
| 56 |
PORTB |= SS;
|
|
| 57 |
if(spi_recv_complete_func)
|
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| 58 |
spi_recv_complete_func();
|
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| 57 |
PORTB |= SS;
|
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| 58 |
if(spi_recv_complete_func)
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| 59 |
spi_recv_complete_func();
|
|
| 59 | 60 |
}else {
|
| 60 | 61 |
//usb_puts("There are this many bytes left: "); usb_puti(spi_bytes);usb_puts("\r\n");
|
| 61 |
SPDR = 0xff;
|
|
| 62 |
}
|
|
| 62 |
SPDR = 0xff;
|
|
| 63 |
} |
|
| 63 | 64 |
} |
| 64 | 65 |
} |
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