This is the quick start guide for the USB host mass-storage module (UHI MSC) with step-by-step instructions on how to configure and use the modules in a selection of use cases.
The use cases contain several code fragments. The code fragments in the steps for setup can be copied into a custom initialization function, while the steps for usage can be copied into, e.g., the main application function.
In this basic use case, the "USB Host MSC (Single Class support)" module is used.
The "USB Host MSC (Multiple Classes support)" module usage is described in Advanced use cases.
This example do a simple physical memory access, but a File System module can be added to decode the USB memory file system, see FatFS examples.
Content of conf_usb_host.h:
#define USB_HOST_UHI UHI_MSC #define UHI_MSC_CHANGE(dev, b_plug) my_callback_msc_change(dev, b_plug) extern bool my_callback_msc_change(uhc_device_t* dev, bool b_plug); #include "uhi_msc_mem.h" // At the end of conf_usb_host.h file
Add to application C-file:
static bool my_flag_autorize_msc_check = false; bool my_callback_msc_change(uhc_device_t* dev, bool b_plug) { if (b_plug) { my_flag_autorize_msc_check = true; } else { my_flag_autorize_msc_check = false; } } void my_task(void) { if (!my_flag_autorize_msc_check) { return; } my_flag_autorize_msc_check = false; // Check all new USB disks plugged for (uint8_t lun=0; lun < uhi_msc_mem_get_lun(); lun++) { // Wait the end of USB disk install while (CTRL_BUSY == uhi_msc_mem_test_unit_ready(lun)); if (CTRL_GOOD != uhi_msc_mem_test_unit_ready(lun)) { // Removal disk not present or fail continue; } // Read capacity uint32_t max_lba; uhi_msc_mem_read_capacity(lun, &max_lba); } }
#define USB_HOST_UHI UHI_MSC
#define UHI_MSC_CHANGE(dev, b_plug) my_callback_msc_change(dev, b_plug) extern bool my_callback_msc_change(uhc_device_t* dev, bool b_plug);
For more advanced use of the UHI MSC module, see the following use cases: