Revision 316
SPI update, still not functional
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/* |
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* SPI MODULE
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* |
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* ...work in progress
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/* @file spi.c
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* @brief
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* SPI module
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* @bug broken
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*/ |
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#include <avr/interrupt.h> |
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#include "ring_buffer.h" |
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#include "spi.h" |
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#include <dragonfly_lib.h> |
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/* |
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PINS: |
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SS = PB0 |
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SCK = PB1 |
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MOSI = PB2 |
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MISO = PB3 |
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*/ |
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/* Controls clock freq. see Table 72 of specs*/ |
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/* Controls clock freq. see Table 72 */ |
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#define DOUBLE_SCK 1 |
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#define SPR0_BIT 1 |
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#define SPR1_BIT 0 |
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#define LSB 1 |
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#define MSB 0 |
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RING_BUFFER_NEW(spi_buffer, 64, char, spi_send_buff, spi_rec_buff); |
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char spi_status; |
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volatile char spi_status; |
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static spi_fun_recv_t spi_recv_function; |
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static spi_fun_send_t spi_send_function; |
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int |
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spi_init()
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spi_init(char mode,spi_fun_send_t send_func, spi_fun_recv_t recv_func)
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{
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usb_puts("spi_init: start\n");
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cli(); |
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RING_BUFFER_CLEAR(spi_send_buff); |
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RING_BUFFER_CLEAR(spi_rec_buff); |
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spi_recv_function = recv_func; |
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spi_send_function = send_func; |
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SPCR = (1<<SPIE)| |
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(1<<SPE)|(LSB<<DORD)|(mode<<MSTR)| |
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(SPR1_BIT<<SPR1)|(SPR0_BIT<<SPR0); |
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SPSR = (DOUBLE_SCK<<SPI2X); |
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/* Set MOSI and SCK as output -- also SS for now...*/ |
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DDR_SPI = (1<<PB2)|(1<<PB1)|(1<<PB0); |
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spi_status = SPI_VOID; |
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if(mode == MASTER) |
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DDRB = (1<<PB2)|(1<<PB1)|(1<<PB0); |
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else{
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DDRB = (1<<PB3); |
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} |
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SPCR = (1<<SPIE)|(1<<SPE)|(LSB<<DORD)|(1<<MSTR)| |
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(SPR1_BIT<<SPR1)|(SPR0_BIT<<SPR0); |
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SPSR = (1<<SPIF)|(DOUBLE_SCK<<SPI2X); |
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sei(); |
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usb_puts("spi_init: end\n");
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} |
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void
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int
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spi_send(char *data, size_t bytes) |
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{
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if(bytes == 0) return -1; /* ...needed?*/ |
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cli(); |
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for(i = 1; i < bytes; i++) {
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if(RING_BUFFER_FULL(spi_send_buff)) {
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sei(); |
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return -1; |
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usb_puts("spi_send: start\n");
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int i; |
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if(bytes == 0) return -1; /* ...needed?*/ |
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cli(); |
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for(i = 1; i < bytes; i++) {
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if(RING_BUFFER_FULL(spi_send_buff)) {
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sei(); |
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return -1; |
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} |
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RING_BUFFER_ADD(spi_send_buff, data[i]); |
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} |
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RING_BUFFER_ADD(spi_send_buff, data[i]);
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}
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sei();
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spi_status |= SPI_SENDING;
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SPDR = *data;
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sei();
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spi_status = SPI_SENDING;
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SPDR = *data;
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usb_puts("spi_send: end\n");
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//sei();
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} |
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char |
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spi_receive(void) |
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{
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spi_status = SENDING; |
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ISR(SIG_SPI) {
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usb_puts("ISR: start\n");
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char c = SPDR; |
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return SPDR; |
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} |
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ISR(SIG_SPI) {
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char c; |
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usb_putc('['); usb_puti(c);usb_putc(',');usb_puti(spi_status);usb_puts("]\n");
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switch(spi_status){
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case SENDING: |
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case SPI_SENDING:
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if(!RING_BUFFER_EMPTY(spi_send_buff)) {
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RING_BUFFER_REMOVE(spi_send_buff, c); |
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usb_puts("SPDR=["); usb_puti(c);usb_putc(',');usb_puti(spi_status);usb_puts("]\n");
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SPDR = c; |
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c = SPDR; |
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usb_puts("c=["); usb_puti(c);usb_putc(',');usb_puti(spi_status);usb_puts("]\n");
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} else {
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/* notify of sent? */ |
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spi_status = VOID; |
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spi_status = SPI_VOID; |
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} |
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break; |
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case RECEIVING:
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spi_send_func(SPDR);
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case SPI_VOID:
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spi_recv_function(c);
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break; |
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} |
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SPSR ^= (1 << SPIF); |
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usb_puts("ISR: end\n");
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} |
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