DMA hardcoded off

[williamrobotma]

In SPIBus.cpp, the code for begin() is as follows:

esp_err_t SPI::begin(int mosi_io_num, int miso_io_num, int sclk_io_num, int max_transfer_sz) {  
    spi_bus_config_t config; 
    config.mosi_io_num = mosi_io_num;  
    config.miso_io_num = miso_io_num;  
    config.sclk_io_num = sclk_io_num;  
    config.quadwp_io_num = -1;  // -1 not used  
    config.quadhd_io_num = -1;  // -1 not used  
    config.max_transfer_sz = max_transfer_sz;  
    return spi_bus_initialize(host, &config, 0);  // 0 DMA not used  
}

It looks like you can set max_transfer_sz, but then it calls spi_bus_initialize with 0 for DMA. I was wondering if there was any easy way to set the DMA using the functions, whether that would be added in the future, or if it could be manually added?

Sincerely,
Thanks!