diff --git a/ChangeLog b/ChangeLog
index df00a50227c7797257a53c68bcebfa71f5df2119..c78cfc152f54402c9f2663ecba480f4d0f7d2e97 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2014-05-10
+------------------------------------------------------------------------
+
+Added initial Linux SPI implementation to use the library on a
+Raspberry Pi or other Linux based SPI-capable platforms.
+
------------------------------------------------------------------------
2012-01-28
@@ -5,7 +11,7 @@
* included rfm12_read_interrupt_flags_inline() again for performance
reasons (interrupt handler might be to slow on 115200 Baud otherwise)
* clear interrupt flag before checking status (there is a glitch sometimes
- while the int line goes high, which triggers another interrupt otherweise,
+ while the int line goes high, which triggers another interrupt otherwise,
which also hurts performance
* LNA controllable over rfm12_livectrl
diff --git a/src/include/rfm12_spi.c b/src/include/rfm12_spi.c
index de0833742d7d5d9c2ead4a5f7946876b14ebe7cb..d2a56f5e1de13bc03cb3371c68de5d55960182e4 100644
--- a/src/include/rfm12_spi.c
+++ b/src/include/rfm12_spi.c
@@ -27,6 +27,7 @@
#define SS_ASSERT() PORT_SS &= ~(1<<BIT_SS)
#define SS_RELEASE() PORT_SS |= (1<<BIT_SS)
+#ifdef __PLATFORM_AVR__
#if RFM12_SPI_SOFTWARE
/* @description Actual sending function to send raw data to the Module
@@ -135,3 +136,5 @@ static void spi_init(void) {
SPCR = (1<<SPE) | (1<<MSTR) | (1<<SPR0); //SPI Master, clk/16
#endif
}
+
+#endif
diff --git a/src/include/rfm12_spi_linux.c b/src/include/rfm12_spi_linux.c
new file mode 100644
index 0000000000000000000000000000000000000000..8b3b2d7c70b8328461f5cde43353aa97dcacc0a5
--- /dev/null
+++ b/src/include/rfm12_spi_linux.c
@@ -0,0 +1,107 @@
+#ifdef __PLATFORM_LINUX__
+#include <linux/spi/spidev.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <byteswap.h>
+#include <unistd.h>
+
+static const char *device = "/dev/spidev0.1";
+static int fd;
+static uint8_t mode = 0;
+static uint8_t bits = 8;
+static uint32_t speed = 250000;
+
+static void pabort(const char *s)
+{
+ perror(s);
+ abort();
+}
+
+
+static void spi_init(void) {
+ int ret = 0;
+
+ fd = open(device, O_RDWR);
+
+ if (fd < 0) {
+ pabort("driver not loaded? can't open device");
+ }
+ ret = ioctl(fd, SPI_IOC_WR_MODE, &mode);
+ if (ret == -1)
+ pabort("can't set spi mode");
+
+ ret = ioctl(fd, SPI_IOC_RD_MODE, &mode);
+ if (ret == -1)
+ pabort("can't get spi mode");
+
+ /*
+ * bits per word
+ */
+ ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
+ if (ret == -1)
+ pabort("can't set bits per word");
+
+ ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
+ if (ret == -1)
+ pabort("can't get bits per word");
+
+ /*
+ * max speed hz
+ */
+ ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
+ if (ret == -1)
+ pabort("can't set max speed hz");
+
+ ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
+ if (ret == -1)
+ pabort("can't get max speed hz");
+}
+
+static uint16_t rfm12_read(uint16_t address) {
+ int ret;
+
+ uint8_t rx[2];
+ uint8_t tx[2];
+
+ tx[0] = (uint8_t) (address >> 8);
+ tx[1] = (uint8_t) (address & 0xFF);
+
+ rx[0] = 0;
+ rx[1] = 0;
+
+ struct spi_ioc_transfer tr = {
+ .tx_buf = (unsigned long)tx,
+ .rx_buf = (unsigned long)rx,
+ .len = 2,
+ .delay_usecs = 0,
+ .speed_hz = speed,
+ .bits_per_word = bits,
+ };
+
+ ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
+
+ if (ret < 1)
+ pabort("can't send spi message");
+
+
+ return ((uint16_t)rx[0] << 8) + rx[1];
+}
+
+static void rfm12_data(uint16_t d) {
+ uint8_t buffer[2];
+ buffer[0] = (uint8_t) (d >> 8);
+ buffer[1] = (uint8_t) (d & 0xff);
+
+ write(fd, buffer, sizeof(buffer));
+}
+
+static uint8_t rfm12_read_int_flags_inline(void) {
+ uint16_t ret = rfm12_read(0x0000);
+
+ return ret >> 8;
+}
+
+#endif
diff --git a/src/rfm12.c b/src/rfm12.c
index 8e696b316d68308f94423688736e9242168705f5..90c9473b295903a016d5f39ccb44754f5fe22346 100644
--- a/src/rfm12.c
+++ b/src/rfm12.c
@@ -34,10 +34,14 @@
/************************
* standard includes
*/
+#ifdef __PLATFORM_AVR__
#include <avr/io.h>
#include <avr/interrupt.h>
-#include <string.h>
#include <avr/pgmspace.h>
+#endif
+
+#include <string.h>
+
/************************
@@ -85,6 +89,7 @@ rfm12_control_t ctrl;
/* include spi functions into here */
#include "include/rfm12_spi.c"
+#include "include/rfm12_spi_linux.c"
/*
* include control / init functions into here
@@ -142,7 +147,9 @@ ISR(RFM12_INT_VECT, ISR_NOBLOCK)
do {
//clear AVR int flag
+#ifdef __PLATFORM_AVR__
RFM12_INT_FLAG = (1<<RFM12_FLAG_BIT);
+#endif
//first we read the first byte of the status register
//to get the interrupt flags
@@ -646,7 +653,11 @@ rfm12_start_tx(uint8_t type, uint8_t length) {
//set TX Power, frequency shift
#define RFM12_CMD_TXCONF_DEFAULT (RFM12_CMD_TXCONF | RFM12_POWER | RFM12_TXCONF_FS_CALC(FSK_SHIFT) )
+#ifdef __PLATFORM_AVR__
static const uint16_t init_cmds[] PROGMEM = {
+#else
+static const uint16_t init_cmds[] = {
+#endif
//defined above (so shadow register is inited with same value)
RFM12_CMD_CFG_DEFAULT,
@@ -708,8 +719,10 @@ static const uint16_t init_cmds[] PROGMEM = {
*/
void rfm12_init(void) {
//initialize spi
+#ifdef __PLATFORM_AVR__
SS_RELEASE();
DDR_SS |= (1<<BIT_SS);
+#endif
spi_init();
//typically sets DDR registers for RFM12BP TX/RX pin
@@ -756,9 +769,17 @@ void rfm12_init(void) {
//write all the initialisation values to rfm12
uint8_t x;
- for (x = 0; x < ( sizeof(init_cmds) / 2) ; x++) {
- rfm12_data(pgm_read_word(&init_cmds[x]));
- }
+
+ #ifdef __PLATFORM_AVR__
+
+ for (x = 0; x < ( sizeof(init_cmds) / 2) ; x++) {
+ rfm12_data(pgm_read_word(&init_cmds[x]));
+ }
+ #else
+ for (x = 0; x < ( sizeof(init_cmds) / 2) ; x++) {
+ rfm12_data(init_cmds[x]);
+ }
+ #endif
#ifdef RX_ENTER_HOOK
RX_ENTER_HOOK;
@@ -774,11 +795,16 @@ void rfm12_init(void) {
#endif
//setup interrupt for falling edge trigger
+#ifdef __PLATFORM_AVR__
RFM12_INT_SETUP();
+#endif
//clear int flag
rfm12_read(RFM12_CMD_STATUS);
+
+#ifdef __PLATFORM_AVR__
RFM12_INT_FLAG = (1<<RFM12_FLAG_BIT);
+#endif
//init receiver fifo, we now begin receiving.
rfm12_data(CLEAR_FIFO);
diff --git a/src/rfm12.h b/src/rfm12.h
index 5b13b5ad31a767d0d852313601eda3c004549923..ff7e1d219f226bc9f51816aae42899c1d75466bb 100644
--- a/src/rfm12.h
+++ b/src/rfm12.h
@@ -40,6 +40,10 @@
#ifndef _RFM12_H
#define _RFM12_H
+#ifdef __PLATFORM_LINUX__
+#include <stdint.h>
+#endif
+
//this was missing, but is very important to set the config options for structs and such
#include "include/rfm12_core.h"