r.flags = SPI_TRANS_USE_RXDATA; ret = spi_device_polling_transmit(spi, &r); assert(ret == ESP_OK); if (r.rxlength > 0) { //DEBUG_PRINTD("rxlength = %d",r.rxlength); memcpy(data_rx, r.rx_data, length); } return true; } /***crazyflie***/ bool spiExchange(size_t len...
t t;memset(&t, 0, sizeof(t));t.flags = SPI_TRANS_USE_TXDATA | SPI_TRANS_USE_RXDATA;t...
注意:所有SPI相关的API都不能在中断服务函数或上下文切换期间使用,因为SPI相关的API都调用了互斥量,可能会造成系统错误 SPI 调用#include "driver/spi_master.h"或#include "driver/spi_slave.h"
t t;memset(&t, 0, sizeof(t));t.flags = SPI_TRANS_USE_TXDATA | SPI_TRANS_USE_RXDATA;t...
SPI 被创建之后,虽然传输速率有了很大的提升,但是还是无法满足贪婪人类的欲望,但是时钟频率又不能无限提升,所以就额外增加线路传输数据,如果多一根线的话,每次就能传2个bit的数据。所以Dual SPI就是将SPI的MOSI和MISO都改成双向IO口。 3. Quad SPI 在Dual SPI基础上,再增加两个IO口,就能实现每次4bit数据的传输...
SPI(serial peripheral interface)是串行外设接口的简称,是一种高速全双工同步的通信总线。 ESP32S3一共有4个spi外设。 SPI0,供 ESP32-S3 的 GDMA 控制器与 Cache 访问封装内或封装外 flash/PSRAM SPI1,供 CPU 访问封装内或封装外 flash/PSRAM SPI2,通用 SPI 控制器,通过 GDMA 分配 DMA 通道进行访问 ...
.flags = SPI_TRANS_USE_TXDATA, .tx_data = {value}, .rx_buffer = &RxDataBuff, .rxlength =32//.user = (void*) &sensor_ctx,}; err =spi_device_acquire_bus(m_stepper_cfg[channel].hspi, portMAX_DELAY);if(err != ESP_OK )printf("SPI ACQ BUS ERROR\n"); err =spi_device_trans...
uint sendSPIdata(uint8_t cmd, uint8_t data_h, uint8_t data_l, uint8_t chcksum, spi_transaction_t trasactionHandle){ ESP_LOGI(TAG, "Sending data to SPI bus"); int n=0; esp_err_t ret = -1;trasactionHandle.flags = SPI_TRANS_USE_RXDATA | SPI_TRANS_USE_TXDATA;...
spi_transaction_t trans_desc = { // .tx_buffer = tx_data, .rx_buffer = rx_data, .length = 16, .flags = SPI_TRANS_USE_RXDATA, };// spi_device_transmit(spi_device, &trans_desc); spi_device_polling_start(spi_device, &trans_desc, portMAX_DELAY);spi_device_polling_transmit(spi_...
taccRead(uint8_taddr,uint8_tbytes =1){if(bytes ==0)return0;if(bytes >4) bytes =4; addr &=0x3F;spi_transaction_ttrans; trans.flags = SPI_TRANS_USE_RXDATA; trans.tx_buffer =nullptr; trans.addr =0x80| addr;if(bytes >1) trans.addr |=0x40; trans.length =0; trans.rxlength =...