spi

1 功能概述

bk7236具有2路SPI控制器，对应三组SPI引脚。介绍SPI接口的cli命令使用。

2 代码路径

demo路径：components\bk_cli\cli_spi.c

3 cli命令简介

demo运行依赖的宏配置：

NAME

Description

File

value

CONFIG_SPI_DMA

SPI support DMA

middleware\soc\bk7236\bk7236.defconfig

y

CONFIG_SPI_SLAVE

support SPI slave mode

middleware\soc\bk7236\bk7236.defconfig

y

CONFIG_SPI_MASTER

support SPI master mode

middleware\soc\bk7236\bk7236.defconfig

y

CONFIG_SPI_STATIS

support SPI statis func

middleware\soc\bk7236\bk7236.defconfig

y

CONFIG_SPI_SUPPORT_TX_FIFO_WR_READY

support tx write ready

middleware\soc\bk7236\bk7236.defconfig

y

demo支持的命令如下表：

Command

Param

Description

spi_driver {init|deinit}

{init|deinit}:

init/deinit the spi resoure common

spi {id} init [role] [bit_width]

[polarity] [phase] [wire_mode]

[baud_rate] [bit_order] [dma_mode]

{id}:spi id,value range 0 ~ 1

init spi and set working parameters

{role}:master or slave

{bit_width}: support 8 or 16 bits

{polarity}: CPOL support 0 or 1

{phase}:CPHA support 0 or 1

{wire_mode}: support 3 or 4 wire mode

{baud_rate}:spi baud rate

{bit_order}: support LSB or MSB

{dma_mode}: support DMA

spi_config

{id}

baud_rate {value}

{value}:support baud rate

set spi working parameters

mode {value}

{value}:spi spi mode 0~3

bit_width {value}

{value}: support 8 or 16 bits

wire_mode {value}

{value}:support 3 or 4 wire mode

bit_order {value}

{value}:support LSB or MSB

spi {id} {read|write}

{length}

{id}:spi id,value range 0 ~ 1

read specified length of data through spi

{read|write}: read|write operation

{length}: length to be read|write

SPI 支持的波特率如下：

static const uint32_t s_spi_clk_list[] = {
26000000, /**< DIV1 */
13000000, /**< DIV2 */
6500000,  /**< DIV4 */
5200000,  /**< DIV5 */
3250000,  /**< DIV8 */
2600000,  /**< DIV10 */
2000000,  /**< DIV13 */
1625000,  /**< DIV16 */
1300000,  /**< DIV20 */
1040000,  /**< DIV25 */
1000000,  /**< DIV26 */
};

SPI模式和极性、相位的对应关系

Command

CPOL

CPHA

0[00]

0

0

0[01]

0

1

0[10]

1

0

0[11]

1

1

4 演示介绍

1、bk7236开发板在con4中将SPI引出，使用2块bk7236开发板，按照下图进行连接

对应的GPIO：

GPIO

FUNC

P44

SCK

P45

CSN

P46

MOSI

P47

MISO

2、启动开发板，对2块开发板分别输入初始化命令，分别设置为master和slave

master： spi 0 init master 8 1 1 4 10000000 MSB 1 //主机输入命令

[15:47:52.552]发→◇spi_driver init

[15:47:52.567]收←◆spi_driver init
cli:I(87880284):spi driver init
$
[15:47:52.661]收←◆
$
[15:50:51.443]发→◇spi 0 init master 8 1 1 4 10000000 MSB 1
□
[15:50:51.443]收←◆spi 0 init master 8 1 1 4 10000000 MSB 1
hal:I(88059168):spi select src_clk xtal
cli:I(88059168):spi init, spi_id=0

slave： spi 0 init master 8 1 1 4 10000000 MSB 1 //从机输入命令

[15:47:48.942]发→◇spi_driver init
[15:47:48.957]收←◆spi_driver init
cli:I(1085932):spi driver init
$
[15:47:49.051]收←◆
$
[15:52:33.910]发→◇spi 0 init slave 8 1 1 4 10000000 MSB 1
□
[15:52:33.910]收←◆spi 0 init slave 8 1 1 4 10000000 MSB 1
hal:I(1370886):spi select src_clk xtal
cli:I(1370888):spi init, spi_id=0

3、从机进入接收状态，主机发送数据

slave：spi 0 read 1024

master：spi 0 write 1024

[15:54:01.239]发→◇spi 0 write 1024
□
[15:54:01.255]收←◆spi 0 write 1024
cli:I(88248974):spi write bytes, spi_id=0, data_len=1024

$cli:I(88248984):spi Tx finish! UART send OK!

4、从机接收到数据

I(1458228):spi read, spi_id=0, size:1024
cli:I(1458228):recv_buffer[0]=0x0
cli:I(1458230):recv_buffer[1]=0x1
cli:I(1458230):recv_buffer[2]=0x2
cli:I(1458230):recv_buffer[3]=0x3
......
cli:I(1458230):recv_buffer[3]=0xff