全志R16平台SPI0接口的验证V1.1（分色排版）

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全志R16平台SPI0接口的验证

2017/10/20 16:50

版本：V1.1

1、确定driver的name为spidev：

Q:\r16_tinav2.1\spi_csdn_tinav2.1\lichee\linux-3.4\drivers\spi\spidev.c

static struct spi_driver spidev_spi_driver = {

.driver = {

.name ="spidev",

.owner = THIS_MODULE,

.probe = spidev_probe,

.remove = __devexit_p(spidev_remove),

/* NOTE: suspend/resume methods are not necessary here.

* We don't do anything except pass the requests to/from

* the underlying controller. The refrigerator handles

* most issues; the controller driver handles the rest.

};

2、打开spi0，定义spi_dev_num的数量大于1，定义spi_board0的modalias为spidev（必须和驱动保持一致）：

Q:\r16_tinav2.1\spi_csdn_tinav2.1\target\allwinner\astar-parrot\configs\sys_config.fex

;----------------------------------------------------------------------------------

;SPI controller configuration

;spi_used = SPIx enable

;spi_cs_bitmap = SPI bit mapping

;----------------------------------------------------------------------------------

[spi0]

spi_used = 1

spi_cs_bitmap = 1

spi_mosi = port:PC00<3><default><default><default>

spi_miso = port:PC01<3><default><default><default>

spi_sclk = port:PC02<3><default><default><default>

spi_cs0 = port:PC03<3><1><default><default>

[spi1]

spi_used = 0

spi_cs_bitmap = 1

spi_cs0 = port:PA00<2><1><default><default>

spi_sclk = port:PA01<2><default><default><default>

spi_mosi = port:PA02<2><default><default><default>

spi_miso = port:PA03<2><default><default><default>

;----------------------------------------------------------------------------------

;SPI device configuration

;spi_dev_num: number of spi devices

;----------------------------------------------------------------------------------

[spi_devices]

spi_dev_num = 1

;----------------------------------------------------------------------------------

;[spi_board0] spi device configuration

;modalias = spi device name

;sflash_size = spi flash size, optional, if spi_board0 is nor flash , carefully

;max_speed_hz = max transfer speed

;bus_num = bus ID

;chip_select = chip select, 0,1

;mode = SPI transfer mode

;----------------------------------------------------------------------------------

[spi_board0]

;modalias = "at25df641"

modalias = "spidev"

sflash_size = 32

max_speed_hz = 50000000

bus_num = 0

chip_select = 0

mode = 0

3、原始编译：

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1$ tar zxvf r16_tinav2.1_csdn_20170901_1040.tar.gz

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1$

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1$ mv tina spi_csdn_tinav2.1

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1$

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1$ cd spi_csdn_tinav2.1/

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ source build/envsetup.sh

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ lunch

30. astar_parrot-tina

Which would you like?30

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ make -j12

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ pack -d

刷机之后：

root@TinaLinux:/#

root@TinaLinux:/# find . -name spi*

./proc/irq/97/spi0

./sys/bus/spi

./sys/bus/spi/devices/spi0.0

./sys/bus/platform/devices/spi.0

./sys/bus/platform/drivers/spi

./sys/bus/platform/drivers/spi/spi.0

./sys/devices/platform/spi.0

./sys/devices/platform/spi.0/spi_master

./sys/devices/platform/spi.0/spi_master/spi0

./sys/devices/platform/spi.0/spi_master/spi0/spi0.0

./sys/class/spi_master

./sys/class/spi_master/spi0

./sys/kernel/debug/clk/hosc/pll_periph/pll_periphahb1/ahb1/spinlock

./sys/kernel/debug/clk/hosc/pll_periph/spi0

./sys/kernel/debug/clk/hosc/spi1

root@TinaLinux:/#

4、在内核中打开SPI（生成设备节点/dev/spidev0.0）：

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ make kernel_menuconfig

Device Drivers --->

[*] SPI support --->

< > User mode SPI device driver support

修改为：

<*> User mode SPI device driver support

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ make -j12

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ pack -d

（有兴趣的可以看看增加了哪些东西！）

root@TinaLinux:/# find . -name spi*

./dev/spidev0.0

./proc/irq/97/spi0

./sys/bus/spi

./sys/bus/spi/devices/spi0.0

./sys/bus/spi/drivers/spidev

./sys/bus/spi/drivers/spidev/spi0.0

./sys/bus/platform/devices/spi.0

./sys/bus/platform/drivers/spi

./sys/bus/platform/drivers/spi/spi.0

./sys/devices/platform/spi.0

./sys/devices/platform/spi.0/spi_master

./sys/devices/platform/spi.0/spi_master/spi0

./sys/devices/platform/spi.0/spi_master/spi0/spi0.0

./sys/devices/platform/spi.0/spi_master/spi0/spi0.0/spidev

./sys/devices/platform/spi.0/spi_master/spi0/spi0.0/spidev/spidev0.0

./sys/class/spi_master

./sys/class/spi_master/spi0

./sys/class/spidev

./sys/class/spidev/spidev0.0

./sys/kernel/debug/clk/hosc/pll_periph/pll_periphahb1/ahb1/spinlock

./sys/kernel/debug/clk/hosc/pll_periph/spi0

./sys/kernel/debug/clk/hosc/spi1

./sys/module/spidev

root@TinaLinux:/#

5、增加SPI的测试验证程序（spidev_test.c）：

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ find . -name spidev_test.c

./lichee/linux-3.4/Documentation/spi/spidev_test.c

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$

请严重注意：测试应用程序的名字不能叫：spidev_test。感觉是tinav2.1的SDK自动过滤掉了spidev_test这个应用程序名！

不过叫spidev_test0还是可以的！^_

W:\spi_csdn_tinav2.1\package\allwinner\spidev_test0\Makefile

W:\spi_csdn_tinav2.1\package\allwinner\spidev_test0\src\Makefile

（spidev_test0.c这个就是lichee/linux-3.4/Documentation/spi/spidev_test.c，不过需要根据实际修改设备节点！）

默认为：static const char *device = "/dev/spidev1.1";

请改为：static const char *device = "/dev/spidev0.0";

W:\spi_csdn_tinav2.1\package\allwinner\spidev_test0\src\spidev_test0.c

static const char *device = "/dev/spidev0.0";

static uint8_t mode;

static uint8_t bits = 8;

static uint32_t speed = 500000;

static uint16_t delay;

static void transfer(int fd)

{

int ret;

//uint8_t tx[] = {

//0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

//0x40, 0x00, 0x00, 0x00, 0x00, 0x95,

//0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

//0xDE, 0xAD, 0xBE, 0xEF, 0xBA, 0xAD,

//0xF0, 0x0D,

//};

// CityBrand WelCome U!

uint8_t tx[] = {

0x43, 0x69, 0x74, 0x79, 0x42, 0x72, 0x61, 0x6E, 0x64, 0x20,

0x57, 0x65, 0x6C, 0x43, 0x6F, 0x6D, 0x65, 0x20, 0x55, 0x21,

0x43, 0x69, 0x74, 0x79, 0x42, 0x72, 0x61, 0x6E, 0x64, 0x20,

0x57, 0x65, 0x6C, 0x43, 0x6F, 0x6D, 0x65, 0x20, 0x55, 0x21,

0x43, 0x69, 0x74, 0x79, 0x42, 0x72, 0x61, 0x6E, 0x64, 0x20,

0x57, 0x65, 0x6C, 0x43, 0x6F, 0x6D, 0x65, 0x20, 0x55, 0x21,

};

uint8_t rx[ARRAY_SIZE(tx)] = {0, };

struct spi_ioc_transfer tr = {

.tx_buf = (unsigned long)tx,

.rx_buf = (unsigned long)rx,

.len = ARRAY_SIZE(tx),

.delay_usecs = delay,

.speed_hz = speed,

.bits_per_word = bits,

};

ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);

if (ret < 1)

pabort("can't send spi message");

for (ret = 0; ret < ARRAY_SIZE(tx); ret++) {

//if (!(ret % 6))

//puts(" ");

//printf("%.2X ", rx[ret]);

if (!(ret % 20)){

puts("\n");

}

printf("%c", rx[ret]);

}

//puts("");

puts("\n");

}

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ make menuconfig

Allwinner --->

< > spidev_test0.................... spidev_test0 just test the SPI interface (NEW)

修改为：

<*> spidev_test0.................... spidev_test0 just test the SPI interface

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ make -j12

rootroot@cm-System-Product-Name:/home/rediron/r16_tinav2.1/spi_csdn_tinav2.1$ pack -d

开发板：SC3817R。

请将开发板上的U8引脚上的第2脚（SPI0-MISO）和第5脚（SPI0-MOSI）通过1k欧姆的电阻连接在一起！（不建议直连，阻值可以根据实际情况灵活决定！）

[ 15.706372] xt_time: kernel timezone is -0000

[ 16.581894] android_usb gadget: high-speed config #1: android

BusyBox v1.24.1 () built-in shell (ash)

_____ _ __ _

|_ _||_| ___ _ _ | | |_| ___ _ _ _ _

| | _ | || | | |__ | || || | ||_'_|

| | | || | || _ | |_____||_||_|_||___||_,_|

|_| |_||_|_||_|_| Tina is Based on OpenWrt!

----------------------------------------------

Tina Linux (Neptune, 593A1793)

----------------------------------------------

root@TinaLinux:/#

root@TinaLinux:/# spidev_test0

spi mode: 0

bits per word: 8

max speed: 500000 Hz (500 KHz)

CityBrand WelCome U!

root@TinaLinux:/#

（验证通过！）

参考资料：

http://www.xuebuyuan.com/1345420.html

Linux2.6.32下SPI驱动的移植如下图所示：

http://blog.sina.com.cn/s/blog_6182b82201011s6j.html

基于S3C2440的Linux SPI驱动移植笔记

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