Revision 490
slave -> master kind of works
| branches/encoders/code/projects/template/main.c | ||
|---|---|---|
| 2 | 2 |
#include "spi.h" |
| 3 | 3 |
|
| 4 | 4 |
#define MODE 0 |
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#define TEST 1 |
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extern char spi_status; |
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|
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void recv_func(char c) {
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usb_puts("Received: ");
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usb_putc(c); |
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usb_puts("\r\n");
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if(MODE) |
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usb_puts("MASTER");
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else |
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usb_puts("SLAVE");
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usb_puts(": received [");usb_putc(c);usb_puts("]\n\r");
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return; |
| 11 | 15 |
} |
| 12 | 16 |
|
| ... | ... | |
| 16 | 20 |
{
|
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dragonfly_init(ALL_ON); |
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spi_init(MODE, recv_func); |
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usb_puts("Init done\r\n");
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usb_puts("Init done\n\r");
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while(1) {
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//usb_puts("loop\r\n");
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if (MODE) {
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spi_master_recv_on(); |
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}else {
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SPDR = 'b'; |
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// delay_ms(10); |
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if(TEST){
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if(MODE){
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spi_read_one(); |
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delay_ms(1000); |
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} else {
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if(!(spi_status &SPI_SEND)) |
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spi_send("SLAVE",6);
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} |
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} else {
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if (MODE) {
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spi_send("MASTER",6);
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} |
|
| 27 | 37 |
} |
| 28 | 38 |
|
| 29 | 39 |
} |
| branches/encoders/code/projects/libdragonfly/spi.c | ||
|---|---|---|
| 37 | 37 |
|
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spi_mode = mode; |
| 39 | 39 |
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//cli(); |
|
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RING_BUFFER_CLEAR(spi_send_buff); |
| 42 | 41 |
RING_BUFFER_CLEAR(spi_rec_buff); |
| 43 | 42 |
|
| ... | ... | |
| 52 | 51 |
SPSR = 0x00; |
| 53 | 52 |
SPSR = _BV(SPI2X); |
| 54 | 53 |
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spi_status = SPI_VOID;
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spi_status = SPI_RECV;
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|
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/* Set SCLK, SS, MOSI as outputs. MISO as input */ |
| 58 | 57 |
if(mode == MASTER) {
|
| ... | ... | |
| 72 | 71 |
int spi_send(char *data, size_t bytes) {
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int i; |
| 75 |
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usb_puts("spi_send: start\n");
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|
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if(bytes == 0) |
| 79 | 76 |
return -1; /* ...needed?*/ |
| ... | ... | |
| 92 | 89 |
|
| 93 | 90 |
sei(); |
| 94 | 91 |
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spi_status = SPI_SENDING;
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spi_status |= SPI_SEND;
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| 96 | 93 |
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if (spi_mode == MASTER ){
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| 98 | 95 |
PORTB &= ~SS; //Select slave |
| 99 | 96 |
} |
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SPDR = *data; |
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if(spi_mode) |
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usb_puts("MASTER");
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else |
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usb_puts("SLAVE");
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usb_puts(": sending [");usb_putc(*data);usb_puts("]\n\r");
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usb_puts("spi_send: end\n");
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//sei(); |
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return 1; |
| 106 | 107 |
} |
| 107 | 108 |
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void spi_master_recv_on() {
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spi_status = SPI_VOID;
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void spi_read_one(void)
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{
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PORTB &= ~SS; |
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SPDR = 'x'; |
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} |
| 112 | 114 |
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void spi_master_recv_off() {
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spi_status = SPI_VOID; |
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PORTB |= SS; |
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} |
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|
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ISR(SIG_SPI) {
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usb_puts("ISR: start\n\r");
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char c; |
| 121 |
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//usb_putc('['); usb_puti(c);usb_putc(',');usb_puti(spi_status);usb_puts("]\n\r");
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switch(spi_status){
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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\r");
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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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if (spi_mode == MASTER) |
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PORTB |= SS; //Turn off Slave select |
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spi_status = SPI_VOID; |
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} |
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break; |
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case SPI_VOID: |
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spi_recv_function(SPDR); |
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break; |
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if(!RING_BUFFER_EMPTY(spi_send_buff)) {//cheap way to test if SPI_SEND
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RING_BUFFER_REMOVE(spi_send_buff, c); |
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SPDR = c; |
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if(spi_mode) |
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usb_puts("MASTER");
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else |
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usb_puts("SLAVE");
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usb_puts(": sending [");usb_putc(c);usb_puts("]\n\r");
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} else if(spi_status & SPI_SEND) {
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spi_status ^= SPI_SEND; |
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PORTB |= SS; //Sleep slave |
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} |
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if(spi_status & SPI_RECV){
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spi_recv_function(SPDR); |
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if(spi_mode == MASTER) |
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PORTB |= SS; |
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| 141 | 133 |
} |
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} |
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| 142 | 135 |
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usb_puts("ISR: end\n");
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} |
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| branches/encoders/code/projects/libdragonfly/spi.h | ||
|---|---|---|
| 1 |
#ifndef __SPI_H__ |
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| 2 |
#define __SPI_H__ |
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|
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#define DOUBLE_SCK 1 |
| 2 | 5 |
#define SPR0_BIT 1 |
| 3 | 6 |
#define LSB 1 |
| 4 | 7 |
#define MSB 0 |
| 5 | 8 |
#define MASTER 1 |
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#define SLAVE 0 |
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#define SPI_SENDING 1 |
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#define SPI_VOID 0 |
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#define SPI_MASTER_RECV 2 |
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| 10 | 10 |
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#define SPI_IDLE _BV(0) |
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#define SPI_SEND _BV(1) |
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#define SPI_RECV _BV(2) |
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#define SPI_BOTH _BV(3) |
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|
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/* Pin Defines */ |
| 12 | 18 |
#define MOSI _BV(PB2) |
| 13 | 19 |
#define MISO _BV(PB3) |
| ... | ... | |
| 21 | 27 |
int spi_send(char *data, size_t bytes); |
| 22 | 28 |
void spi_master_recv_on(void); |
| 23 | 29 |
void spi_master_recv_off(void); |
| 30 |
void spi_read_one(void); |
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|
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#endif |
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