代码下载地址:
https://download.csdn.net/download/qq_31806069/11239726
1、 在esp-idf/examples/peripherals/spi_master,修改的。
2、 SPI的最底层的驱动程序。
2.1(ESP32有四个SPI外设,称为SPI0,SPI1,HSPI和VSPI。 SPI0完全专用于ESP32用于将连接的SPI闪存设备映射到存储器的闪存缓存。 SPI1连接到与SPI0相同的硬件线,用于写入闪存芯片。 HSPI和VSPI可以免费使用。 SPI1,HSPI和VSPI都有三条片选线,允许它们最多驱动三个SPI器件作为主器件。)
2.2 spi_master.h的接口函数有两种方式调用SPI,中断传输SPI和轮询传输SPI。官方不建议混用两种方式。
bool LIS3DH_ReadReg(u8_t Reg, u8_t* Data)
{
esp_err_t ret;
spi_transaction_t t;
ACC_CS_LOW(); // CSN low, initialize SPI communication...
Reg|=0x80;
memset(&t, 0, sizeof(t)); //Zero out the transaction
t.length=8; //Command is 8 bits
t.tx_buffer=&Reg; //The data is the cmd itself
#if IS_POLLIN
ret=spi_device_polling_transmit(my_li3dh_spi, &t); //Transmit!
assert(ret==ESP_OK); //Should have had no issues.
#else
spi_device_transmit(my_li3dh_spi, &t);
#endif
memset(&t, 0, sizeof(t));
t.length=8;
t.flags = SPI_TRANS_USE_RXDATA;
#if IS_POLLIN
ret = spi_device_polling_transmit(my_li3dh_spi, &t);
assert( ret == ESP_OK );
#else
spi_device_transmit(my_li3dh_spi, &t);
#endif
*Data = t.rx_data[0];
//printf("--->%x-%x-%x\n",t.rx_data[0],t.rx_data[1],t.rx_data[2]);
ACC_CS_HIGH(); // CSN high, terminate SPI communication
return true;
}
bool LIS3DH_WriteReg(u8_t WriteAddr, u8_t Data)
{
esp_err_t ret;
spi_transaction_t t;
uint8_t buf[2];
ACC_CS_LOW(); // CSN low, init SPI transaction
WriteAddr &= 0x7f;
buf[0] = WriteAddr;
buf[1] = Data;
memset(&t, 0, sizeof(t)); //Zero out the transaction
t.length=8*2; //Command is 8 bits
t.tx_buffer=buf; //The data is the cmd itself
//t.user=(void*)0; //D/C needs to be set to 0
#if IS_POLLIN
ret=spi_device_polling_transmit(my_li3dh_spi, &t); //Transmit!
assert(ret==ESP_OK);
#else
spi_device_transmit(my_li3dh_spi, &t);
//spi_device_queue_trans
#endif
//Should have had no issues.
ACC_CS_HIGH(); // CSN high, terminate SPI communication
return true;
}
3、 主函数
AxesRaw_t axes[32];
uint8_t get_data_item;
int16_t xt,yt,zt;
int i ;
static uint32_t AccSensorData[32];
void app_main()
{
esp_err_t ret;
spi_device_handle_t spi;
spi_bus_config_t buscfg=
{
.miso_io_num=kx203_miso,
.mosi_io_num=kx203_mosi,
.sclk_io_num=kx203_clk,
.quadwp_io_num=-1,
.quadhd_io_num=-1,
.max_transfer_sz=PARALLEL_LINES*320*2+8
};
spi_device_interface_config_t devcfg=
{
.clock_speed_hz=5*1000*1000, //Clock out at 10 MHz
.mode=0, //SPI mode 0
.spics_io_num=-1,//PIN_NUM_CS, //CS pin
.queue_size=7, //We want to be able to queue 7 transactions at a time
//.pre_cb=0,//lcd_spi_pre_transfer_callback, //Specify pre-transfer callback to handle D/C line指定预传输回调以处理D/C线
};
//Initialize the SPI bus
ret=spi_bus_initialize(HSPI_HOST, &buscfg, 1);// HSPI_HOST
ESP_ERROR_CHECK(ret);
//Attach the LCD to the SPI bus 将LCD连接到SPI总线上
ret=spi_bus_add_device(HSPI_HOST, &devcfg, &spi);//HSPI_HOST
ESP_ERROR_CHECK(ret);
init_kx203_gpio();
assignment_spi(spi);
printf("------------>g_sensor_ok%d\n",AccSensorConfig());
while(1)
{
printf("------------------->\n");
get_data_item=GetData(axes);
for(i= 0; i < get_data_item; i++)
{
xt=((int16_t)axes[i].AXIS_X)>>4;
yt=((int16_t)axes[i].AXIS_Y)>>4;
zt=((int16_t)axes[i].AXIS_Z)>>4;
AccSensorData[i] = xt*xt+yt*yt+zt*zt;
AccSensorData[i] /= 100;
printf("%02d-x:%d-y:%d-z:%d\n",i,xt,yt,zt);
}
vTaskDelay(500 / portTICK_PERIOD_MS);
}
}
4、运行结果。
image.png