Version: **
Question: How do I check if the FX3 bootloader is running using the Linux SDK or what is the equivalent of the IsBootLoaderRunning() function in FX3 Linux SDK?
Answer:
FX3 Linux SDK does not have a specific function to check if the FX3 bootloader is running.
But, the functionality can be achieved using the vendor command 0xA0 through control transfer (cyusb_control_transfer() function).
The vendor command 0xA0 is implemented in FX3 Bootloader for firmware download and upload, and the same command can be used to check if the FX3 is in bootloader mode.
A single byte IN control transfer with request code 0xA0 is initiated. If the control transfer succeeds and returns a byte, then the bootloader in running.
Control transfer parameters:
bRequest = 0xA0;
bmRequestType = 0xC0;
wValue = 0x0000;
wIndex = 0x0000;
wLength = 1;
Control Transfer function prototype from FX3 Linux SDK:
int cyusb_control_transfer (cyusb_handle *h, unsigned char bmRequestType,
unsigned char bRequest, unsigned short wValue,
unsigned short wIndex, unsigned char *data,
unsigned short wLength, unsigned int timeout);
Sample Code:
int num = cyusb_open();
printf("number of devices = %d\n", num);
if (num <= 0)
return -1;
cyusb_handle *h = cyusb_gethandle(0);
unsigned short vid = cyusb_getvendor(h);
unsigned short pid = cyusb_getproduct(h);
printf("vid = %04x, pid = %04x\n" , vid, pid);
unsigned char bmReqType = 0xC0;
unsigned char bRequest = 0xA0;
unsigned short wValue = 0x0000;
unsigned short wIndex = 0x0000;
unsigned short wLength = 1;
unsigned char buf_data[1] = {0};
unsigned int timeout = 5000;
int retval = cyusb_control_transfer (h, bmReqType, bRequest, wValue, wIndex, buf_data, wLength, timeout);
if(retval>0)
printf("fx3 bootloader running\n");
else
printf("fx3 bootloader not running\n");
