trans[5].length=240*2*8*PARALLEL_LINES;//Data length, in bitstrans[5].flags=0;//undo SPI_TRANS_USE_TXDATA flag//Queue all transactions.for(x=0; x<6; x++) { ret=spi_device_queue_trans(spi, &trans[x], portMAX_DELAY);// ret=spi_device_polling_transmit(spi, &trans[x]);asser...
Re: ESP32 spi_device_queue_trans error Postbymichael»Mon Feb 11, 2019 3:39 pm It looks like the problem was from DMA. I set it to 0 and I had to put it to 1 in order to use DMA in transaction. Hi tatulea, Thanks for your sharing of the debug result. ...
通过调用函数spi_device_queue_trans()对所有事务进行排队,稍后使用函数spi_device_get_trans_result()查询结果,或者通过将所有请求馈送到spi_device_transmit()中来同步处理所有请求。 轮询 调用函数spi_device_polling_transmit()发送轮询事务。或者,如果您想在两者之间插入一些东西,请使用spi_device_polling_start()...
staticintspi_match_device(structdevice *dev,structdevice_driver *drv) {conststructspi_device *spi =to_spi_device(dev);conststructspi_driver *sdrv =to_spi_driver(drv);/*Check override first, and if set, only use the named driver*/if(spi->driver_override)returnstrcmp(spi->driver_override,...
device_driver的作用有点大,这里的SPI作为其他驱动的底层支持,例如我们有基于SPI的RTC、PHY等等器件,那么就会用到这个。 c /*** struct spi_driver - Host side "protocol" driver* @id_table: List of SPI devices supported by this driver* @probe: Binds this driver to the spi device. Drivers can ve...
* @transfer: adds a message to the controller's transfer queue. * @cleanup: frees controller-specific state * @can_dma: determine whether this controller supports DMA * @dma_map_dev: device which can be used for DMA mapping * @cur_rx_dma_dev: device which is currently used for RX DMA...
可以看到结构如上图所示,比如一个 SPI Flash 它就属于 spi_device 的范畴,针对这个 SPI Flash 的驱动具体业务,就属于 spi_driver 的范畴,而 SPI 主机控制器,只是提供了一组操作的通道,可以属于 platform device 的范畴。 3、数据结构 3.1、spi_controller (spi_master) ...
uint32_t flags; ///< Bitwise OR of SPI_DEVICE_* flags int queue_size; ///< Transaction queue size. This sets how many transactions can be 'in the air' (queued using spi_device_queue_trans but not yet finished using spi_device_get_trans_result) at the same time transaction_cb_...
调用函数 :cppspi_device_queue_trans 将传输事务添加到队列中,随后使用函数 :cppspi_device_get_trans_result 查询结果,或将所有请求输入 :cppspi_device_transmit 实现同步处理。 轮询传输事务 <polling_transactions> 调用函数 :cppspi_device_polling_transmit 发送轮询传输事务。若有插入内容的需要,也可使用 :...
{"device",1,0,'D'},{"speed",1,0,'s'},{"delay",1,0,'d'},{"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'},{NULL,...