# SPI
## 模块功能介绍
SPI是一种全双工同步串行接口，可以工作在Master模式和Slave模式，SPI主要有以下特点：
* 全双工同步串行接口
* Master/Slave模式可配置
* 支持最大96MHz时钟频率
* 支持SPI Mode0/1/2/3
* 片选和时钟的极性和相位可配置
* 5个时钟源
* 支持中断或DMA传输
* 支持多片选
* 支持Standard Single/Dual/Quad SPI，FIFO深度64B
* 支持BIT模式，用于3Wire场景，支持可编程0~32bits帧长度（仅支持Master模式，且不支持DMA和FIFO功能）
* 支持DBI模式，用于显示设备场景，用于传输视频数据
## 模块配置介绍
目前有两种方法进行引脚配置：`sys_config`和平台头文件。
这两种方法选其中一种使用即可，在没有`sys_config`文件配置时，默认使用平台头文件。当检测到有`sys_config`文件并有相关关键字时，自动切换为该方法。
### sys_config文件引脚配置说明
引脚配置在 `source/project/方案/configs/sys_config.fex`
```
[spi1]
spi1_used = 1
spi1_cs_number = 1
spi1_cs_bitmap = 1
spi1_cs0 = port:PA02<2><0><2><default>
spi1_sclk = port:PA03<2><0><2><default>
spi1_mosi = port:PA04<2><0><2><default>
spi1_miso = port:PA05<2><0><2><default>
spi1_hold = port:PA06<2><0><2><default>
spi1_wp = port:PA07<2><0><2><default>
```
### 平台头文件资源配置说明
引脚配置在 `rtos-hal/hal/source/spi/platform/spi_sun20iw2.h`
```c
static struct sunxi_spi_params_t g_sunxi_spi_params[] = {
/* SPI0 */
{ .port = 0,
.reg_base = SUNXI_SPI0_PBASE, .irq_num = SUNXI_IRQ_SPI0, .gpio_num = 6,
.pclk_pll_type = HAL_SUNXI_AON_CCU, .pclk_pll_id = CLK_DEVICE,
.pclk_hosc_type = HAL_SUNXI_AON_CCU, .pclk_hosc_id = CLK_HOSC,
.bus_type = HAL_SUNXI_CCU, .bus_id = CLK_BUS_SPI0,
.mclk_type = HAL_SUNXI_CCU, .mclk_id = CLK_SPI0,
.reset_type = HAL_SUNXI_RESET, .reset_id = RST_SPI0,
.gpio_clk = GPIOB(6), .gpio_mosi = GPIOB(5), .gpio_miso = GPIOB(15),
.gpio_cs0 = GPIOB(4), .gpio_wp = GPIOB(14), .gpio_hold = GPIOB(7),
.mux = 4, .driv_level = GPIO_DRIVING_LEVEL2,
#ifdef CONFIG_DRIVERS_DMA
.drq_tx = DRQDST_SPI0_TX, .drq_rx = DRQSRC_SPI0_RX,
#endif
.rx_fifosize = 64, .tx_fifosize = 64, .dma_force_fixed = true,
},
......
};
```
### menuconfig 配置说明
配置路径如下：
```
Kernel Setup --->
Drivers Setup --->
SoC HAL Drivers --->
SPI Devices --->
```
 )
## 源码结构介绍
SPI 模块代码结构如下所示：
```
rtos-hal/
|--include/hal/sunxi_hal_spi.h // hal层数据结构和API接口相关头文件
|--hal/source/spi/platform_spi.h // hal层平台相关头文件
|--hal/source/spi/platform/spi_xxx.h // hal层平台信息相关头文件
|--hal/source/spi/common_spi.h // hal层控制器寄存器相关头文件
|--hal/source/spi/hal_spi.c // hal层接口驱动代码
|
|--hal/test/spi/test_spi.c // hal层接口测试代码
|--hal/test/spi/spi_slave_driver.c // hal层slave模式驱动代码
|--hal/test/spi/test_spi_slave.c // hal层slave模式测试代码
```
## 模块接口说明
需要包含头文件：
```c
#include <hal/sunxi_hal_spi.h>
```
## 重要结构体及宏定义
### SPI模式功能选择
```c
#define SPI_CPHA BIT(0) /* clock phase */
#define SPI_CPOL BIT(1) /* clock polarity */
#define SPI_MODE_0 (0|0)
#define SPI_MODE_1 (0|SPI_CPHA)
#define SPI_MODE_2 (SPI_CPOL|0)
#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
#define SPI_CS_HIGH BIT(2) /* chipselect active high? */
#define SPI_LSB_FIRST BIT(3) /* per-word bits-on-wire */
#define SPI_3WIRE BIT(4) /* SI/SO signals shared */
#define SPI_LOOP BIT(5) /* loopback mode */
#define SPI_NO_CS BIT(6) /* 1 dev/bus, no chipselect */
#define SPI_READY BIT(7) /* slave pulls low to pause */
#define SPI_TX_DUAL BIT(8) /* transmit with 2 wires */
#define SPI_TX_QUAD BIT(9) /* transmit with 4 wires */
#define SPI_RX_DUAL BIT(10) /* receive with 2 wires */
#define SPI_RX_QUAD BIT(11) /* receive with 4 wires */
```
- SPI_MODE_0/1/2/3：设置SPI的传输模式。
- SPI_CS_HIGH：设置CS片选是否为高电平有效。
- SPI_LSB_FIRST：设置发送顺序是低位在前。
- SPI_3WIRE：设置SPI工作在3线模式下，及MOSI即用作输入也用作输入，实现半双工通信
### SPI控制器模式配置
```c
typedef enum
{
HAL_SPI_BUS_MASTER = 0,
HAL_SPI_BUS_SLAVE = 1,
HAL_SPI_BUS_BIT = 2,
} hal_spi_master_bus_mode_t;
```
- HAL_SPI_BUS_MASTER：处于Master模式，外接SPI Device。
- HAL_SPI_BUS_SLAVE：处于Slave模式，被其他Master访问。
- HAL_SPI_BUS_BIT：处于BIT模式，使用3Wire方式进行数据传输。
### SPI控制器片选模式
```c
typedef enum
{
HAL_SPI_CS_AUTO = 0,
HAL_SPI_CS_SOFT = 1,
} hal_spi_master_cs_mode_t;
```
- HAL_SPI_CS_AUTO：硬件自动控制，不需要驱动或软件介入。
- HAL_SPI_CS_SOFT：软件手动控制，由驱动完成相关操作。
### SPI控制器采样模式
```c
typedef enum
{
SUNXI_SPI_SAMP_MODE_OLD = 0,
SUNXI_SPI_SAMP_MODE_NEW = 1,
} hal_spi_master_bus_sample_mode_t;
```
- SUNXI_SPI_SAMP_MODE_OLD：粗调模式，共有3档可调
- SUNXI_SPI_SAMP_MODE_NEW：细调模式，共有7档可调
> 粗调模式为驱动根据时钟频率自动识别，不需要额外配置
```c
typedef enum
{
SUNXI_SPI_SAMP_DELAY_CYCLE_0_0 = 0,
SUNXI_SPI_SAMP_DELAY_CYCLE_0_5 = 1,
SUNXI_SPI_SAMP_DELAY_CYCLE_1_0 = 2,
SUNXI_SPI_SAMP_DELAY_CYCLE_1_5 = 3,
SUNXI_SPI_SAMP_DELAY_CYCLE_2_0 = 4,
SUNXI_SPI_SAMP_DELAY_CYCLE_2_5 = 5,
SUNXI_SPI_SAMP_DELAY_CYCLE_3_0 = 6,
} hal_spi_master_spi_sample_mode_t;
```
- SUNXI_SPI_SAMP_DELAY_CYCLE：采样延时调节挡位选择
> 当采样模式处于细调时，才会使用到该参数
### SPI控制器配置结构体
```c
typedef struct
{
hal_spi_master_bus_mode_t bus_mode; // SPI控制器配置
hal_spi_master_cs_mode_t cs_mode; // SPI控制器片选模式
hal_spi_master_bus_sample_mode_t bus_sample_mode; // SPI控制器采样模式 - 粗调
hal_spi_master_spi_sample_mode_t spi_sample_mode; // SPI控制器采样模式 - 细调
uint32_t spi_sample_delay; // SPI控制器细调采样延时
uint8_t chipselect; /* SPI slave device selection */
uint32_t clock_frequency; /* SPI master clock frequency setting */
uint32_t mode; // SPI模式/功能选择
bool sip;
bool flash;
} hal_spi_master_config_t;
```
### SPI传输结构体
```c
typedef struct
{
const uint8_t *tx_buf; /* Data buffer to send */
uint32_t tx_len; /* The total number of bytes to send */
uint32_t tx_single_len; /* The number of bytes to send in single mode */
uint8_t *rx_buf; /* Received data buffer, */
uint32_t rx_len; /* The valid number of bytes received */
uint8_t tx_nbits : 3; /* Data buffer to send in nbits mode */
uint8_t rx_nbits : 3; /* Data buffer to received in nbits mode */
uint8_t dummy_byte; /* Flash send dummy byte, default 0*/
#define SPI_NBITS_SINGLE 0x01 /* 1bit transfer */
#define SPI_NBITS_DUAL 0x02 /* 2bits transfer */
#define SPI_NBITS_QUAD 0x04 /* 4bits transfer */
uint8_t bits_per_word; /* transfer bit_per_word */
} hal_spi_master_transfer_t;
```
## 对外提供的API接口
### hal_spi_init
* 原型:
```c
hal_spi_master_status_t hal_spi_init(int port, hal_spi_master_config_t *cfg)
```
* 作用：SPI模块初始化，主要申请中断、pinctrl初始化、clk初始化、SPI模块，包括SPI总线最大传输速率、片选模式等等
- 参数：
- port:SPI端口号
- cfg:配置信息
- 返回：
- 0:成功
- 负数:失败
### hal_spi_deinit
- 原型:
```c
hal_spi_master_status_t hal_spi_deinit(int port)
```
- 作用：SPI模块去初始化
- 参数：
- port:SPI端口号
* 返回：
- 0:成功
- 负数:失败
### hal_spi_write
* 原型:
```c
hal_spi_master_status_t hal_spi_write(int port, const uint8_t *buf, uint32_t size)
```
* 作用：发送数据，调hal_spi_xfer接口
* 参数：
- port:SPI端口号
- buf:发送数据
- size:发送数据大小
* 返回：
- 0:成功
- 负数:失败
### hal_spi_read
* 原型:
```c
hal_spi_master_status_t hal_spi_read(int port, uint8_t *buf, uint32_t size)
```
* 作用：接收数据，调hal_spi_xfer接口
* 参数：
- port:SPI端口号
- buf:接收数据
- size:接收数据大小
* 返回：
- 0:成功
- 负数:失败
### hal_spi_xfer
* 原型:
```c
hal_spi_master_status_t hal_spi_xfer(int port, hal_spi_master_transfer_t *t, int num)
```
* 作用：发送或接收数据
* 参数：
- port:SPI端口号
- t:指向传输包头的指针
- num:传输包的个数
* 返回：
- 0:成功
- 负数:失败
### hal_spi_slave_abort
* 原型:
```c
hal_spi_master_status_t hal_spi_slave_abort(int port)
```
* 作用：终止slave模式传输
* 参数：
- port:SPI端口号
* 返回：
- 0:成功
- 负数:失败
## 模块使用范例
### Master模式使用及测试范例
```c
hal_spi_master_config_t cfg = { 0 };
cfg.bus_mode = HAL_SPI_BUS_MASTER;
cfg.cs_mode = HAL_SPI_CS_AUTO;
cfg.clock_frequency = 10000000;
cfg.chipselect = 0;
cfg.mode = SPI_MODE_0;
cfg.sip = 0;
cfg.flash = 0;
hal_spi_init(port, &cfg);
```
### BIT模式使用及测试范例
```c
hal_spi_master_config_t cfg = { 0 };
cfg.bus_mode = HAL_SPI_BUS_BIT;
......
hal_spi_init(port, &cfg);
hal_spi_master_transfer_t tr = {
.tx_buf = &buf,
.tx_len = 1,
.rx_buf = NULL,
.rx_len = 0,
.bits_per_word = 8,
};
hal_spi_xfer(port, tr, 1);
```
### 测试范例
```c
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <getopt.h>
#include <sys/time.h>
#include <hal_log.h>
#include <hal_cmd.h>
#include <hal_mem.h>
#include <hal_timer.h>
#include <sunxi_hal_spi.h>
#define KB (1024)
#define MB (1024*KB)
#define US (1)
#define MS (1000*US)
#define S (1000*MS)
static void pabort(const char *s)
{
if (errno != 0)
perror(s);
else
hal_log_err("%s\n", s);
abort();
}
static int port = 1;
static uint32_t mode;
static uint8_t bits = 8;
static uint32_t speed = 5000000;
static int verbose;
static int transfer_size;
static int iterations;
static uint8_t default_tx[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xF0, 0x0D,
};
static uint8_t default_rx[sizeof(default_tx)];
static char *input_tx;
static void hex_dump(const void *src, size_t length, size_t line_size,
char *prefix)
{
int i = 0;
const unsigned char *address = src;
const unsigned char *line = address;
unsigned char c;
printf("%s | ", prefix);
while (length-- > 0) {
printf("%02X ", *address++);
if (!(++i % line_size) || (length == 0 && i % line_size)) {
if (length == 0) {
while (i++ % line_size)
printf("__ ");
}
printf(" |");
while (line < address) {
c = *line++;
printf("%c", (c < 32 || c > 126) ? '.' : c);
}
printf("|\n");
if (length > 0)
printf("%s | ", prefix);
}
}
}
/*
* Unescape - process hexadecimal escape character
* converts shell input "\x23" -> 0x23
*/
static int unescape(char *_dst, char *_src, size_t len)
{
int ret = 0;
int match;
char *src = _src;
char *dst = _dst;
unsigned int ch;
while (*src) {
if (*src == '\\' && *(src+1) == 'x') {
match = sscanf(src + 2, "%2x", &ch);
if (!match)
pabort("malformed input string");
src += 4;
*dst++ = (unsigned char)ch;
} else {
*dst++ = *src++;
}
ret++;
}
return ret;
}
static unsigned long transfer(int port, uint8_t const *tx, uint8_t const *rx, size_t len)
{
hal_spi_master_status_t ret = 0;
unsigned long usec = 0;
struct timeval start, end;
hal_spi_master_transfer_t tr = {
.tx_buf = (uint8_t *)tx,
.tx_len = len,
.rx_buf = (uint8_t *)rx,
.rx_len = len,
.tx_single_len = len,
.dummy_byte = 0,
.bits_per_word = bits,
};
if (mode & SPI_TX_QUAD)
tr.tx_nbits = 4;
else if (mode & SPI_TX_DUAL)
tr.tx_nbits = 2;
else if (mode & SPI_RX_QUAD)
tr.rx_nbits = 4;
else if (mode & SPI_RX_DUAL)
tr.rx_nbits = 2;
if (!(mode & SPI_LOOP)) {
if (mode & (SPI_TX_QUAD | SPI_TX_DUAL))
tr.rx_buf = 0;
else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL))
tr.tx_buf = 0;
else if (mode & SPI_3WIRE)
tr.rx_buf = 0;
}
gettimeofday(&start, NULL);
ret = hal_spi_xfer(port, &tr, 1);
gettimeofday(&end, NULL);
if (ret < 0)
pabort("can't send spi message");
if (verbose)
{
hex_dump(tx, len, 32, "TX");
hex_dump(rx, len, 32, "RX");
}
if (memcmp(tx, rx, len))
hal_log_info("rx/tx buffer is not same, data error!!!\n");
usec = (1000000 * (end.tv_sec - start.tv_sec) + end.tv_usec - start.tv_usec);
return usec;
}
static void print_usage(const char *prog)
{
hal_log_info("Usage: %s [-DsblHOLC3***R24SI]\n", prog);
puts(" -D --device device port to use (default 1)\n"
" -s --speed max speed (Hz)\n"
" -b --bpw bits per word\n"
" -l --loop loopback\n"
" -H --cpha clock phase\n"
" -O --cpol clock polarity\n"
" -L --lsb least significant bit first\n"
" -C --cs-high chip select active high\n"
" -3 --3wire SI/SO signals shared\n"
" -v --verbose Verbose (show tx buffer)\n"
" -p Send data (e.g. \"1234\\xde\\xad\")\n"
" -N --no-cs no chip select\n"
" -R --ready slave pulls low to pause\n"
" -2 --dual dual transfer\n"
" -4 --quad quad transfer\n"
" -S --size transfer size\n"
" -I --iter iterations\n");
}
static int parse_opts(int argc, char *argv[])
{
int ret = 0;
while (1) {
static const struct option lopts[] = {
{ "device", 1, 0, 'D' },
{ "speed", 1, 0, 's' },
{ "bpw", 1, 0, 'b' },
{ "loop", 0, 0, 'l' },
{ "cpha", 0, 0, 'H' },
{ "cpol", 0, 0, 'O' },
{ "lsb", 0, 0, 'L' },
{ "cs-high", 0, 0, 'C' },
{ "3wire", 0, 0, '3' },
{ "no-cs", 0, 0, 'N' },
{ "ready", 0, 0, 'R' },
{ "dual", 0, 0, '2' },
{ "verbose", 0, 0, 'v' },
{ "quad", 0, 0, '4' },
{ "size", 1, 0, 'S' },
{ "iter", 1, 0, 'I' },
{ NULL, 0, 0, 0 },
};
int c;
c = getopt_long(argc, argv, "D:s:b:lHOLC3NR24p:vS:I:",
lopts, NULL);
if (c == -1)
break;
switch (c) {
case 'D':
port = atoi(optarg);
break;
case 's':
speed = atoi(optarg);
break;
case 'b':
bits = atoi(optarg);
break;
case 'l':
mode |= SPI_LOOP;
break;
case 'H':
mode |= SPI_CPHA;
break;
case 'O':
mode |= SPI_CPOL;
break;
case 'L':
mode |= SPI_LSB_FIRST;
break;
case 'C':
mode |= SPI_CS_HIGH;
break;
case '3':
mode |= SPI_3WIRE;
break;
case 'N':
mode |= SPI_NO_CS;
break;
case 'v':
verbose = 1;
break;
case 'R':
mode |= SPI_READY;
break;
case 'p':
input_tx = optarg;
break;
case '2':
mode |= SPI_TX_DUAL;
break;
case '4':
mode |= SPI_TX_QUAD;
break;
case 'S':
transfer_size = atoi(optarg);
break;
case 'I':
iterations = atoi(optarg);
break;
default:
print_usage(argv[0]);
ret = -1;
}
}
if (mode & SPI_LOOP) {
if (mode & SPI_TX_DUAL)
mode |= SPI_RX_DUAL;
if (mode & SPI_TX_QUAD)
mode |= SPI_RX_QUAD;
}
return ret;
}
static void transfer_escaped_string(int port, char *str)
{
size_t size = strlen(str);
uint8_t *tx;
uint8_t *rx;
tx = hal_malloc(size);
if (!tx)
pabort("can't allocate tx buffer");
rx = hal_malloc(size);
if (!rx)
pabort("can't allocate rx buffer");
size = unescape((char *)tx, str, size);
transfer(port, tx, rx, size);
hal_free(rx);
hal_free(tx);
}
static void show_transfer_info(unsigned long size, unsigned long time)
{
double rate;
printf("total size : ");
if (size >= MB) {
printf("%.2lf MB", (double)size/(double)MB);
} else if (size >= KB) {
printf("%.2lf KB", (double)size/(double)KB);
} else {
printf("%lu B", size);
}
printf("\n");
printf("total time : ");
if (time >= S) {
printf("%.2lf s", (double)time/(double)S);
} else if (time >= MS) {
printf("%.2lf ms", (double)time/(double)MS);
} else {
printf("%.2lf us", (double)time/(double)US);
}
printf("\n");
rate = ((double)size / (double)MB) / ((double)time / (double)S);
printf("averange rate: %.2lf MB/s\n", rate);
}
static unsigned long transfer_buf(int port, int len)
{
uint8_t *tx;
uint8_t *rx;
int i;
unsigned long usec = 0;
tx = hal_malloc(len);
if (!tx)
pabort("can't allocate tx buffer");
srand(time(NULL));
for (i = 0; i < len; i++)
tx = random();
rx = hal_malloc(len);
if (!rx)
pabort("can't allocate rx buffer");
usec = transfer(port, tx, rx, len);
if (mode & SPI_LOOP) {
if (memcmp(tx, rx, len)) {
fprintf(stderr, "transfer error !\n");
hex_dump(tx, len, 32, "TX");
hex_dump(rx, len, 32, "RX");
exit(1);
}
}
hal_free(rx);
hal_free(tx);
return usec;
}
static int cmd_spidev_test(int argc, char **argv)
{
hal_spi_master_config_t cfg = { 0 };
port = 1;
mode = 0;
bits = 8;
speed = 5000000;
verbose = 0;
transfer_size = 0;
iterations = 0;
input_tx = NULL;
memset(default_rx, 0, sizeof(default_rx));
if (parse_opts(argc, argv) < 0) {
return 0;
}
if (mode & SPI_3WIRE)
cfg.bus_mode = HAL_SPI_BUS_BIT;
else
cfg.bus_mode = HAL_SPI_BUS_MASTER;
cfg.cs_mode = HAL_SPI_CS_AUTO;
cfg.clock_frequency = speed;
cfg.chipselect = 0;
cfg.mode = mode;
cfg.sip = 0;
cfg.flash = 0;
hal_spi_init(port, &cfg);
hal_log_info("spi mode: 0x%x\n", mode);
hal_log_info("bits per word: %u\n", bits);
hal_log_info("max speed: %u Hz (%u kHz)\n", speed, speed/1000);
if (input_tx)
transfer_escaped_string(port, input_tx);
else if (transfer_size) {
unsigned long total_size = transfer_size * iterations;
unsigned long total_usec = 0;
int i;
for (i = 0; i < iterations; i++)
total_usec += transfer_buf(port, transfer_size);
show_transfer_info(total_size, total_usec);
printf("averange time: %.2lf us\n", (double)total_usec/(double)(iterations));
} else
transfer(port, default_tx, default_rx, sizeof(default_tx));
hal_spi_deinit(port);
return 0;
}
FINSH_FUNCTION_EXPORT_CMD(cmd_spidev_test, hal_spidev_test, spidev hal APIs tests)
```
## Slave模式使用及测试范例
### Slave模式使用范例
重点代码：
```c
hal_spi_master_config_t cfg = { 0 };
cfg.bus_mode = HAL_SPI_BUS_SLAVE;
cfg.clock_frequency = 10000000;
cfg.chipselect = 0;
cfg.mode = SPI_MODE_0;
hal_spi_init(port, &cfg);
```
```c
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#include <hal_log.h>
#include <hal_cmd.h>
#include <hal_mem.h>
#include <hal_timer.h>
#include <hal_thread.h>
#include <sunxi_hal_spi.h>
#include <platform_spi.h>
#ifdef CONFIG_ARCH_SUN20IW2
#define SPI_SLAVE_THREAD_STACK_SIZE 4096
#else
#define SPI_SLAVE_THREAD_STACK_SIZE 8192
#endif
#define SLAVE_CACHE_MAX (4096)
#define PKT_HEAD_LEN 5
#define OP_MASK 0
#define ADDR_MASK_0 1
#define ADDR_MASK_1 2
#define LEN_MASK_0 3
#define LEN_MASK_1 4
#define SUNXI_OP_WRITE 0x01
#define SUNXI_OP_READ 0x03
#define SUNXI_OP_HEAD 0xff
enum sunxi_spi_slave_status {
SUNXI_SPI_SLAVE_NONE = 0,
SUNXI_SPI_SLAVE_RUNNING,
SUNXI_SPI_SLAVE_RETRY,
SUNXI_SPI_SLAVE_STOP,
};
struct sunxi_spi_slave_head {
u8 op_code;
u16 addr;
u16 len;
};
struct sunxi_spi_slave_frame {
u8 data[PKT_HEAD_LEN];
struct sunxi_spi_slave_head pkt_head;
u8 *tx_buf;
u8 *rx_buf;
};
struct sunxi_spi_slave_cache {
hal_spinlock_t buffer_lock;
u8 *buffer;
u32 size;
};
struct sunxi_spi_slave_test {
int port;
hal_spi_master_config_t cfg;
hal_sem_t semaphore_finished;
hal_spi_master_transfer_t xfer;
struct sunxi_spi_slave_frame frame;
struct sunxi_spi_slave_cache cache;
enum sunxi_spi_slave_status status;
hal_thread_t thread_handle;
char task_name[256];
};
static struct sunxi_spi_slave_test spi_slave_test[HAL_SPI_MASTER_MAX];
static bool sunxi_spi_dump_data(const uint8_t *buf, uint32_t offset, uint32_t len)
{
int col = 16;
int line = len / col;
int last = len % col;
int i, j;
uint8_t *buffer = (int8_t *)buf + offset;
for (i = 0; i < line; i++) {
printf("%08X: ", i + offset);
for (j = 0; j < col; j++) {
printf("%02x ", buffer[col * i + j]);
}
printf("\n");
}
printf("%08X: ", col * line + offset);
for (j = 0; j < last; j++) {
printf("%02x ", buffer[col * line + j]);
}
printf("\n");
}
int sunxi_spi_init_slave_data(struct sunxi_spi_slave_test *slave, u8 pattern)
{
memset(slave->cache.buffer, pattern, slave->cache.size);
return 0;
}
static bool sunxi_spi_slave_has_ptk_head(struct sunxi_spi_slave_head *head)
{
if (head->op_code || head->addr || head->len)
return true;
return false;
}
static void sunxi_spi_slave_head_data_parse(unsigned char *data, struct sunxi_spi_slave_head *head)
{
head->op_code = data[OP_MASK];
head->addr = (data[ADDR_MASK_0] << 8) | data[ADDR_MASK_1];
head->len = (data[LEN_MASK_0] << 8) | data[LEN_MASK_1];
}
static void sunxi_spi_slave_head_data_clear(unsigned char *data, int len)
{
memset(data, 0, len);
}
static int sunxi_spi_slave_set_cache_data(struct sunxi_spi_slave_test *slave,
struct sunxi_spi_slave_head *head, u8 *buf)
{
struct sunxi_spi_slave_cache *cache = &slave->cache;
int real_size = head->len;
if (cache->size < head->addr) {
hal_log_err("Set data addr over range");
return 0;
}
if (cache->size < head->addr + head->len) {
real_size = cache->size - head->addr;
hal_log_err("Write size %d over range, some of data will be lost, real size to write is %d",
head->len, real_size);
}
hal_spin_lock(&cache->buffer_lock);
memcpy(cache->buffer + head->addr, buf, real_size);
hal_spin_unlock(&cache->buffer_lock);
return 0;
}
static int sunxi_spi_slave_get_cache_data(struct sunxi_spi_slave_test *slave,
struct sunxi_spi_slave_head *head, u8 *buf)
{
struct sunxi_spi_slave_cache *cache = &slave->cache;
int real_size = head->len;
if (cache->size < head->addr) {
hal_log_err("Get data addr over range");
return 0;
}
if (cache->size < head->addr + head->len) {
real_size = cache->size - head->addr;
hal_log_err("Read size %d over range, some of data will be lost, real size to read is %d",
head->len, real_size);
}
hal_spin_lock(&cache->buffer_lock);
memcpy(buf, cache->buffer + head->addr, real_size);
hal_spin_unlock(&cache->buffer_lock);
return 0;
}
static int sunxi_spi_slave_test_submit(struct sunxi_spi_slave_test *slave)
{
struct sunxi_spi_slave_head *pkt_head = &slave->frame.pkt_head;
int ret;
sunxi_spi_slave_head_data_parse(slave->frame.data, pkt_head);
if (!sunxi_spi_slave_has_ptk_head(pkt_head)) {
hal_log_debug("No Package head, wait revice from master");
pkt_head->op_code = SUNXI_OP_HEAD;
slave->xfer.rx_buf = slave->frame.data;
slave->xfer.rx_len = sizeof(slave->frame.data);
} else {
sunxi_spi_slave_head_data_clear(slave->frame.data, sizeof(slave->frame.data));
hal_log_debug("op=0x%x addr=0x%x len=0x%x", pkt_head->op_code, pkt_head->addr, pkt_head->len);
switch (pkt_head->op_code) {
case SUNXI_OP_WRITE:
slave->frame.rx_buf = hal_malloc(pkt_head->len);
slave->xfer.rx_buf = slave->frame.rx_buf;
slave->xfer.tx_buf = NULL;
slave->xfer.rx_len = pkt_head->len;
break;
case SUNXI_OP_READ:
slave->frame.tx_buf = hal_malloc(pkt_head->len);
slave->xfer.tx_buf = slave->frame.tx_buf;
slave->xfer.rx_buf = NULL;
slave->xfer.tx_len = pkt_head->len;
sunxi_spi_slave_get_cache_data(slave, pkt_head, (u8 *)slave->xfer.tx_buf);
hal_log_debug("sunxi slave get package operation read, send write buffer");
sunxi_spi_dump_data(slave->xfer.tx_buf, 0, slave->xfer.len);
break;
default:
hal_log_debug("unknown op code %d, wait revice from master", pkt_head->op_code);
sunxi_spi_slave_head_data_clear(slave->frame.data, sizeof(slave->frame.data));
pkt_head->op_code = SUNXI_OP_HEAD;
slave->xfer.rx_buf = slave->frame.data;
slave->xfer.tx_buf = NULL;
slave->xfer.rx_len = sizeof(slave->frame.data);
break;
}
}
return hal_spi_xfer(slave->port, &slave->xfer, 1);
}
static void spi_slave_driver_thread(void *pArg)
{
struct sunxi_spi_slave_test *slave = (struct sunxi_spi_slave_test *)pArg;
struct sunxi_spi_slave_head *pkt_head;
int ret;
while (1) {
ret = sunxi_spi_slave_test_submit(slave);
if (ret != HAL_SPI_MASTER_OK) {
switch (slave->status) {
case SUNXI_SPI_SLAVE_RETRY:
hal_log_warn("slave transfer retry");
sunxi_spi_slave_head_data_clear(slave->frame.data, sizeof(slave->frame.data));
goto retry;
break;
case SUNXI_SPI_SLAVE_STOP:
hal_log_warn("slave transfer stop");
goto terminate;
break;
default:
hal_log_err("error status %d and ret %d", slave->status, ret);
break;
}
}
pkt_head = &slave->frame.pkt_head;
switch (pkt_head->op_code) {
case SUNXI_OP_HEAD:
hal_log_debug("sunxi slave get package head");
// sunxi_spi_dump_data(slave->xfer.rx_buf, 0, slave->xfer.len);
break;
case SUNXI_OP_WRITE:
hal_log_debug("sunxi slave get package operation write, recv read buffer");
// sunxi_spi_dump_data(slave->xfer.rx_buf, 0, slave->xfer.len);
sunxi_spi_slave_set_cache_data(slave, pkt_head, slave->xfer.rx_buf);
hal_free(slave->xfer.rx_buf);
slave->xfer.rx_buf = NULL;
slave->frame.rx_buf = NULL;
break;
case SUNXI_OP_READ:
hal_log_debug("send write buffer done");
hal_free((void *)slave->xfer.tx_buf);
slave->xfer.tx_buf = NULL;
slave->frame.tx_buf = NULL;
break;
default:
hal_log_debug("sunxi slave get op_code filed");
sunxi_spi_slave_head_data_clear(slave->frame.data, sizeof(slave->frame.data));
break;
}
retry:
memset(&slave->xfer, 0, sizeof(slave->xfer));
}
terminate:
hal_sem_post(slave->semaphore_finished);
}
static int spi_slave_driver_abort(int port)
{
struct sunxi_spi_slave_test *slave = &spi_slave_test[port];
hal_log_info("slave transfer abort");
slave->status = SUNXI_SPI_SLAVE_RETRY;
hal_spi_slave_abort(port);
return 0;
}
static int spi_slave_driver_dump(int port, int addr, int size)
{
struct sunxi_spi_slave_test *slave = &spi_slave_test[port];
if (addr > slave->cache.size || addr + size > slave->cache.size) {
hal_log_err("dump addr/size out of bounds");
return -1;
}
sunxi_spi_dump_data(slave->cache.buffer, addr, size);
return 0;
}
static int spi_slave_driver_probe(int port, uint32_t freq)
{
struct sunxi_spi_slave_test *slave = &spi_slave_test[port];
slave->port = port;
slave->cfg.clock_frequency = freq;
slave->cfg.chipselect = 0;
slave->cfg.mode = SPI_MODE_0;
slave->cfg.bus_mode = HAL_SPI_BUS_SLAVE;
if (HAL_SPI_MASTER_OK != hal_spi_init(slave->port, &slave->cfg)) {
hal_log_err("spi init failed");
return -1;
}
slave->semaphore_finished = hal_sem_create(0);
if (slave->semaphore_finished == NULL)
{
hal_log_err("[spi%d] creating semaphore_finished failed", slave->port);
return -1;
}
hal_spin_lock_init(&slave->cache.buffer_lock);
slave->cache.size = SLAVE_CACHE_MAX;
slave->cache.buffer = hal_malloc(slave->cache.size);
if (!slave->cache.buffer) {
hal_log_err("alloc slave cache memory failed (size %d)", slave->cache.size);
return -1;
}
sunxi_spi_init_slave_data(slave, 0xff);
snprintf(slave->task_name, sizeof(slave->task_name), "spi%d-slave-task\0", slave->port);
slave->thread_handle = hal_thread_create(spi_slave_driver_thread, slave, slave->task_name,
SPI_SLAVE_THREAD_STACK_SIZE, HAL_THREAD_PRIORITY_SYS);
if (slave->thread_handle == NULL) {
hal_log_err("create thread %s failed", slave->task_name);
return -1;
}
slave->status = SUNXI_SPI_SLAVE_RUNNING;
hal_thread_start(slave->thread_handle);
return 0;
}
static int spi_slave_driver_remove(int port)
{
struct sunxi_spi_slave_test *slave = &spi_slave_test[port];
slave->status = SUNXI_SPI_SLAVE_STOP;
hal_spi_slave_abort(port);
hal_sem_wait(slave->semaphore_finished);
hal_thread_stop(slave->thread_handle);
hal_free(slave->cache.buffer);
hal_spin_lock_deinit(&slave->cache.buffer_lock);
hal_spi_deinit(slave->port);
return 0;
}
static void print_usage(const char *name)
{
hal_log_info("Usage:");
hal_log_info("\t%s probe <port> <freq>", name);
hal_log_info("\t%s remove <port>", name);
hal_log_info("\t%s abort <port>", name);
hal_log_info("\t%s dump <port> <addr> <size>", name);
}
static int cmd_spi_slave_driver(int argc, const char **argv)
{
int port;
uint32_t freq;
int addr, size;
if (argc < 3) {
print_usage(argv[0]);
return -1;
}
port = strtol(argv[2], NULL, 0);
if (port < 0 && port > HAL_SPI_MASTER_MAX) {
hal_log_err("spi port %d not exist", port);
return -1;
}
if (!strcmp(argv[1], "probe")) {
freq = strtol(argv[3], NULL, 0);
spi_slave_driver_probe(port, freq);
}
else if (!strcmp(argv[1], "remove"))
spi_slave_driver_remove(port);
else if (!strcmp(argv[1], "abort"))
spi_slave_driver_abort(port);
else if (!strcmp(argv[1], "dump")) {
addr = strtol(argv[3], NULL, 0);
size = strtol(argv[4], NULL, 0);
spi_slave_driver_dump(port, addr, size);
}
else
print_usage(argv[0]);
return 0;
}
FINSH_FUNCTION_EXPORT_CMD(cmd_spi_slave_driver, hal_spi_slave_driver, spi hal slave driver test)
```
### Slave 模式测试范例
```c
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#include <hal_log.h>
#include <hal_cmd.h>
#include <hal_mem.h>
#include <hal_timer.h>
#include <sunxi_hal_spi.h>
#include <platform_spi.h>
#define PKT_HEAD_LEN 5
#define OP_MASK 0
#define ADDR_MASK_0 1
#define ADDR_MASK_1 2
#define LEN_MASK_0 3
#define LEN_MASK_1 4
#define SUNXI_OP_WRITE 0x01
#define SUNXI_OP_READ 0x03
#define PKT_HEAD_DELAY 100
#define PKT_XFER_DELAY 500
#define KB (1024)
#define MB (1024*KB)
#define US (1)
#define MS (1000*US)
#define S (1000*MS)
struct sunxi_spi_slave_head {
unsigned int op_code;
unsigned int addr;
unsigned int len;
};
static int verbose;
static void hex_dump(const void *src, size_t length, size_t line_size,
char *prefix)
{
int i = 0;
const unsigned char *address = src;
const unsigned char *line = address;
unsigned char c;
printf("%s | ", prefix);
while (length-- > 0) {
printf("%02X ", *address++);
if (!(++i % line_size) || (length == 0 && i % line_size)) {
if (length == 0) {
while (i++ % line_size)
printf("__ ");
}
printf(" |");
while (line < address) {
c = *line++;
printf("%c", (c < 32 || c > 126) ? '.' : c);
}
printf("|\n");
if (length > 0)
printf("%s | ", prefix);
}
}
}
static void show_transfer_info(unsigned long size, unsigned long time)
{
double rate;
printf("total size : ");
if (size >= MB) {
printf("%.2lf MB", (double)size/(double)MB);
} else if (size >= KB) {
printf("%.2lf KB", (double)size/(double)KB);
} else {
printf("%lu B", size);
}
printf("\n");
printf("total time : ");
if (time >= S) {
printf("%.2lf s", (double)time/(double)S);
} else if (time >= MS) {
printf("%.2lf ms", (double)time/(double)MS);
} else if (time >= US) {
printf("%.2lf us", (double)time/(double)US);
} else {
printf("%lu ns", time);
}
printf("\n");
rate = ((double)size / (double)MB) / ((double)time / (double)S);
printf("averange rate: %.2lf MB/s\n", rate);
}
static int transfer_pkg_create(char *buf, struct sunxi_spi_slave_head *head)
{
buf[OP_MASK] = head->op_code;
buf[ADDR_MASK_0] = (head->addr >> 8) & 0xff;
buf[ADDR_MASK_1] = head->addr & 0xff;
buf[LEN_MASK_0] = (head->len >> 8) & 0xff;
buf[LEN_MASK_1] = head->len & 0xff;
return 0;
}
static int transfer_slave_package(int port, struct sunxi_spi_slave_head *head, char *tx_buf, char *rx_buf)
{
char head_buf[PKT_HEAD_LEN];
hal_spi_master_transfer_t tr[2];
int i;
int ret;
memset(tr, 0, sizeof(tr));
transfer_pkg_create(head_buf, head);
if (verbose) {
printf("package head : { ");
for (i = 0; i < PKT_HEAD_LEN; i++) {
printf("0x%02x ", head_buf);
}
printf("}\n");
}
tr[0].tx_buf = (uint8_t *)head_buf;
tr[0].tx_nbits = SPI_NBITS_SINGLE;
tr[0].tx_len = sizeof(head_buf);
tr[0].tx_single_len = sizeof(head_buf);
tr[0].rx_buf = (uint8_t *)NULL;
tr[0].rx_nbits = 0;
tr[0].rx_len = 0;
tr[1].tx_buf = (uint8_t *)tx_buf;
tr[1].tx_nbits = SPI_NBITS_SINGLE;
tr[1].tx_len = head->len;
tr[1].tx_single_len = head->len;
tr[1].rx_buf = (uint8_t *)rx_buf;
tr[1].rx_nbits = SPI_NBITS_SINGLE;
tr[1].rx_len = head->len;
hal_spi_xfer(port, &tr[0], 1);
hal_usleep(PKT_HEAD_DELAY);
hal_spi_xfer(port, &tr[1], 1);
return 0;
}
static int transfer_slave(int port, uint32_t addr, uint32_t size)
{
struct sunxi_spi_slave_head pkt_head;
char *tx_buf = NULL;
char *rx_buf = NULL;
struct timeval start, end;
unsigned long nsec = 0;
int i;
tx_buf = hal_malloc(size);
srand(time(0));
for (i = 0; i < size; i++)
tx_buf = random() % 256;
rx_buf = hal_malloc(size);
memset(rx_buf, 0, size);
gettimeofday(&start, NULL);
// Write forward
pkt_head.op_code = SUNXI_OP_WRITE;
pkt_head.addr = addr;
pkt_head.len = size;
transfer_slave_package(port, &pkt_head, tx_buf, NULL);
hal_usleep(PKT_XFER_DELAY);
// Read back
pkt_head.op_code = SUNXI_OP_READ;
pkt_head.addr = addr;
pkt_head.len = size;
transfer_slave_package(port, &pkt_head, NULL, rx_buf);
gettimeofday(&end, NULL);
// Debug
if (verbose) {
hex_dump(tx_buf, size, 32, "TX");
hex_dump(rx_buf, size, 32, "RX");
}
// Compare buffer
if (memcmp(tx_buf, rx_buf, size))
printf("rx/tx buffer is not same, compare error!!!\n");
else
nsec += (1000000 * (end.tv_sec - start.tv_sec) + end.tv_usec - start.tv_usec);
free(tx_buf);
free(rx_buf);
return nsec;
}
static void print_usage(const char *name)
{
hal_log_info("Usage:");
hal_log_info("\t%s <port> <freq> <addr> <size> <loop> [debug]", name);
}
static int cmd_test_spi_slave(int argc, const char **argv)
{
int port;
hal_spi_master_config_t cfg;
uint32_t addr, size;
int loop = 1;
unsigned long usec;
unsigned long total_usec = 0;
unsigned long total_size = 0;
int i;
if (argc < 6) {
print_usage(argv[0]);
return -1;
}
memset(&cfg, 0, sizeof(cfg));
port = strtol(argv[1], NULL, 0);
if (port < 0 && port > HAL_SPI_MASTER_MAX) {
hal_log_err("spi port %d not exist", port);
return -1;
}
addr = strtol(argv[3], NULL, 0);
size = strtol(argv[4], NULL, 0);
loop = strtol(argv[5], NULL, 0);
if (argc == 7 && strcmp(argv[6], "debug") == 0)
verbose = 1;
else
verbose = 0;
hal_log_info("run spi slave test");
cfg.clock_frequency = strtol(argv[2], NULL, 0);
cfg.chipselect = 0;
cfg.mode = SPI_MODE_0;
cfg.bus_mode = HAL_SPI_BUS_MASTER;
hal_spi_init(port, &cfg);
hal_log_info("max speed: %u Hz (%u kHz)", cfg.clock_frequency, cfg.clock_frequency/1000);
hal_log_info("op addr : %d", addr);
hal_log_info("op size : %d", size);
if (size) {
for (i = 0; i < loop; i++) {
usec = transfer_slave(port, addr, size);
if (usec) {
total_usec += usec;
total_size += (size * 2);
}
}
show_transfer_info(total_size, total_usec);
printf("averange time: %.2lf us\n", (double)total_usec/(double)US/(double)(loop));
}
hal_spi_deinit(port);
hal_log_info("spi slave test finish");
return 0;
}
FINSH_FUNCTION_EXPORT_CMD(cmd_test_spi_slave, hal_spi_slave_test, spi hal slave tests)
```
# 调试方法
使用 `hal_log_info/warn/err/debug` 等调试打印方法，可以根据需求修改系统配置，达到不同的打印等级
```c
#define SPI_INFO(sspi, fmt, arg...) hal_log_info("hal-sspi %08lx.sspi%d: " fmt, sspi->base, sspi->bus_num, ##arg)
#define SPI_WARN(sspi, fmt, arg...) hal_log_warn("hal-sspi %08lx.sspi%d: " fmt, sspi->base, sspi->bus_num, ##arg)
#define SPI_ERR(sspi, fmt, arg...) hal_log_err("hal-sspi %08lx.sspi%d: " fmt, sspi->base, sspi->bus_num, ##arg)
#define SPI_DBG(sspi, fmt, arg...) hal_log_debug("hal-sspi %08lx.sspi%d: " fmt, sspi->base, sspi->bus_num, ##arg)
```
使用 `SPI_DATA_LEVEL/SPI_DUMPREG_LEVEL` 宏开关，可以在传输的过程中打印收发数据 `buffer` 及控制器寄存器值
## 调试工具
如果在 `menuconfig` 中将 `spi test` 配置打开，那么可以在 RTOS 系统中运行相应的 SPI 调试命令。
`hal_spidev_test` 测试SPI Single模式，可以配置端口，频率，数据量，循环次数等参数
- `hal_spidev_test -D <port> -s <freq> -S <size> -I <loop> [-v]`
`hal_spi_slave_driver` Slave模式驱动，需要先再slave设备端跑起该驱动，才能在master端进行相应测试
- `hal_spi_slave_driver probe <port> <freq>`
- `hal_spi_slave_driver remove <port>`
- `hal_spi_slave_driver abort <port>`
- `hal_spi_slave_driver dump <port> <addr> <size>`
`hal_spi_slave_test` Slave模式测试命令，该命令需要在master端运行
- `hal_spi_slave_test <port> <freq> <addr> <size> <loop> [debug]`
## FAQ
### 多笔数据连续发送时，如何让CS脚保持使能
**问题现象**：每包数据发送后，CS脚都会翻转一次，重新使能，导致与外设通信异常
 )
**解决方法**：将 `cs_mode` 配置为手动，并将需要CS信号包在内的多包数据，一次性传给驱动
```c
hal_spi_master_config_t cfg = { 0 };
hal_spi_master_transfer_t tr[2];
......
cfg.cs_mode = HAL_SPI_CS_SOFT;
......
hal_spi_init(port, &cfg);
......
hal_spi_xfer(port, &tr, ARRAY_SIZE(tr));
```
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