CubieTruck的SPI还是不会配置
我用了很多种配置，/dev下也有spidev*.*这样的文件，但是用kernel给的那个spidev_test的时候总是报错：can't set spi mode: Inappropriate ioctl for device
附上我的内核配置和script.fex.
本帖最后由 jiangdou 于 2015-4-13 09:22 编辑
//modify by jiangdou2013-0612
#include <assert.h>
#include <errno.h>
#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
char buf;
char buf2;
int com_serial;
int failcount;
struct spi_ioc_transfer xfer;
////////////////////////
// Init SPIdev
///////////////////////
int spi_init(char filename)
{
int file;
__u8 mode, lsb, bits;
__u32 speed=25000;
if ((file = open(filename,O_RDWR)) < 0)
{
printf("Failed to open the bus.");
/* ERROR HANDLING; you can check errno to see what went wrong */
com_serial=0;
exit(1);
}
///////////////
// Verifications
///////////////
//possible modes: mode |= SPI_LOOP; mode |= SPI_CPHA; mode |= SPI_CPOL; mode |= SPI_LSB_FIRST; mode |= SPI_CS_HIGH; mode |= SPI_3WIRE; mode |= SPI_NO_CS; mode |= SPI_READY;
//multiple possibilities using |
/*
if (ioctl(file, SPI_IOC_WR_MODE, &mode)<0) {
perror("can't set spi mode");
return;
}
*/
if (ioctl(file, SPI_IOC_RD_MODE, &mode) < 0)
{
perror("SPI rd_mode");
return;
}
if (ioctl(file, SPI_IOC_RD_LSB_FIRST, &lsb) < 0)
{
perror("SPI rd_lsb_fist");
return;
}
//sunxi supports only 8 bits
/*
if (ioctl(file, SPI_IOC_WR_BITS_PER_WORD, 8)<0)
{
perror("can't set bits per word");
return;
}
*/
if (ioctl(file, SPI_IOC_RD_BITS_PER_WORD, &bits) < 0)
{
perror("SPI bits_per_word");
return;
}
/*
if (ioctl(file, SPI_IOC_WR_MAX_SPEED_HZ, &speed)<0)
{
perror("can't set max speed hz");
return;
}
*/
if (ioctl(file, SPI_IOC_RD_MAX_SPEED_HZ, &speed) < 0)
{
perror("SPI max_speed_hz");
return;
}
printf("%s: spi mode %d, %d bits %sper word, %d Hz max\n",filename, mode, bits, lsb ? "(lsb first) " : "", speed);
//xfer.tx_buf = (unsigned long)buf;
xfer.len = 2; /* Length ofcommand to write*/
xfer.cs_change = 0; /* Keep CS activated */
xfer.delay_usecs = 1000, //delay in us
xfer.speed_hz = 2500000, //speed
xfer.bits_per_word = 2, // bites per word 8
//xfer.rx_buf = (unsigned long) buf2;////modify by jiangdou2013-0612
xfer.len = 1; /* Length of Data to read */
xfer.cs_change = 0; /* Keep CS activated */
xfer.delay_usecs = 0;
xfer.speed_hz = 2500000;
xfer.bits_per_word = 2;
return file;
}
////////////////////////////////////////
// Read n bytes from the 1 bytes add
///////////////////////////////////////
int spi_read(int add,int file)
{
int status;
char temp;
memset(buf, 0, sizeof(buf));
memset(buf2, 0, sizeof(buf2));
buf = 0x03; //03 ->读命令
buf = add;
//buf = add2; //modify by jiangdou2013-0612
xfer.tx_buf = (unsigned long)buf;
xfer.len = 2; /* Length ofcommand to write*/
xfer.rx_buf = (unsigned long) buf2;
xfer.len = 1; /* Length of Data to read */
status = ioctl(file, SPI_IOC_MESSAGE(2), xfer);
if (status < 0)
{
perror("SPI_IOC_MESSAGE");
return;
}
//printf("env: %02x %02x %02x\n", buf, buf, buf);
//printf("ret: %02x %02x %02x %02x\n", buf2, buf2, buf2, buf2);
com_serial=1;
failcount=0;
temp = buf2;
return temp;
}
////////////////////////////////////////////////////////
// Write n bytes int the 1 bytes address add
///////////////////////////////////////////////////////
//void spi_write(int cmd,int add,int nbytes,char value,int file)
void spi_write(int cmd,int add,int nbytes,char value,int file)
{
unsigned char buf, buf2;
int status;
memset(buf, 0, sizeof(buf));
memset(buf2, 0, sizeof(buf2));
buf = cmd; //02 ->写命令
buf = add;
//buf = add2;
if (nbytes>=1) buf = value;
if (nbytes>=2) buf = value;
if (nbytes>=3) buf = value;
if (nbytes>=4) buf = value;
xfer.tx_buf = (unsigned long)buf;
xfer.len = nbytes+2; /* Length ofcommand to write*/
status = ioctl(file, SPI_IOC_MESSAGE(1), xfer);
if (status < 0)
{
perror("SPI_IOC_MESSAGE");
return;
}
//printf("env: %02x %02x %02x\n", buf, buf, buf);
//printf("ret: %02x %02x %02x %02x\n", buf2, buf2, buf2, buf2);
com_serial=1;
failcount=0;
}
int main()
{
unsigned int i;
char tmp;
char bufw;
static char temp2;
static char *p = temp2
int fd = spi_init("/dev/spidev0.0"); //dev spi_init初始化
tmp = spi_read(0x2C,file); /* 读中断标志寄存器 */
memset(bufw, 0, sizeof(bufw));
memset(temp2, 0, sizeof(temp2));
spi_write(0x02,0x2C,1,bufw,file); /* 清除所有中断标志位 */
}
script.bin
spi_used = 0
spi_cs_bitmap = 1
spi_cs0 = port:PA05<3><default><default><default>
spi_cs1 = port:PA09<3><default><default><default>
spi_sclk = port:PA06<3><default><default><default>
spi_mosi = port:PA07<3><default><default><default>
spi_miso = port:PA08<3><default><default><default>
spi_dev_num = 1
modalias = "spidev"
max_speed_hz = 12000000
bus_num = 0
chip_select = 0
mode = 3
full_duplex = 0
manual_cs = 0
我看了你的 config.gz 压缩包，打开之后，搜索 SPI 项目，初步发现：
CONFIG_SPI_SUN7I=m （这个是编译成模块呀！）
感觉应该要配置成：
CONFIG_SPI_SUN7I=y呀！（这样就会被编译进内核呀！）
也许就是你出错的原因呀！
进 menuconfig 里面选择一下，或者直接修改 .config 文件了！
我用的是 cubieboard2，/dev/spi0.0出不来呀！能够提供一些指导吗？
请问我用这个程序 调用ioctl函数的时候说参数非法Invalidargument是怎么回事？
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