ch375b test code snippet

ch375b_snippet.c

int do_once = 0;

typedef struct __attribute__((__packed__)) {
    uint8_t bLength;
    uint8_t bDescriptorType;
    uint16_t bcdUSB;
    uint8_t bDeviceClass;
    uint8_t bDeviceSubClass;
    uint8_t bDeviceProtocol;
    uint8_t bMaxPacketSize;
    uint16_t idVendor;
    uint16_t idProduct;
    uint16_t bcdDevice;
    uint8_t iManufacturer;
    uint8_t iProduct;
    uint8_t iSerialNumber;
    uint8_t bNumConfigurations;
} USBDeviceDescriptor;

typedef struct __attribute__((__packed__)) {
  uint8_t bLength;
  uint8_t bDescriptorType;
  uint16_t wTotalLength;
  uint8_t bNumInterfaces;
  uint8_t bConfigurationValue;
  uint8_t iConfiguration;
  uint8_t bmAttributes;
  uint8_t bMaxPower;
} USBConfigurationDescriptor;

typedef struct __attribute__((__packed__)) {
  uint8_t bLength;
  uint8_t bDescriptorType;
  uint8_t bInterfaceNumber;
  uint8_t bAlternateSetting;
  uint8_t bNumEndpoints;
  uint8_t bInterfaceClass;
  uint8_t bInterfaceSubClass;
  uint8_t bInterfaceProtocol;
  uint8_t iInterface;
} USBInterfaceDescriptor;

typedef struct __attribute__((__packed__)) {
  uint8_t bLength;
  uint8_t bDescriptorType;
  uint8_t bEndpointAddress;
  uint8_t bmAttributes;
  uint16_t wMaxPacketSize;
  uint8_t bInterval;
} USBEndpointDescriptor;

typedef struct __attribute__((__packed__)) {
  USBConfigurationDescriptor configuration;
  USBInterfaceDescriptor interface;
  USBEndpointDescriptor endpoints[4];
} USBConfigurationDescriptorFull;

void toggleHostEndpoint( uint8_t tog )
{
	USART_PutChar(0x1D);
	USART_PutChar(tog ? 0xC0 : 0x80);
	USB_OTG_BSP_mDelay(2);
}

uint8_t sendToken(uint8_t targetEndpoint, uint8_t pid)
{
	USB_OTG_BSP_mDelay(10);
	USART_PutChar(0x4F); //send token
	USART_PutChar(targetEndpoint << 4 | pid);
	USB_OTG_BSP_mDelay(10);
	USART_PutChar(0x22); // get status
	if (USART_GetChar() != 0x14) while(1);
	USB_OTG_BSP_mDelay(20);
	return 0;
}

uint8_t toggleSend = 0;
uint8_t doBulkTransfer(uint8_t targetEndpoint, uint8_t *c, uint16_t len)
{
	if (len > 64) return !0;
	toggleHostEndpoint(toggleSend);

	/* send data */
	USART_PutChar(0x2B);
	USART_PutChar(len & 0xff);
	USART_Write(c);

	if (!sendToken(targetEndpoint, 0x01)) {
		toggleSend = !toggleSend;
		return 0;
	} else {
		return !0;
	}
}

uint16_t bufIndex = 0;
uint8_t bufSend[64];
void writeToUsb(uint8_t targetEndpoint, uint8_t b){
	if (bufIndex == 64) {
		doBulkTransfer(targetEndpoint, &bufSend[0], bufIndex);
		bufIndex = 0;
	}
	bufSend[bufIndex++] = b;
}

void printUsb(uint8_t targetEndpoint, char *s, uint16_t len) {
	while (len--) {
		writeToUsb(targetEndpoint, *s++);
	}
}

void test_usb_ch375b( void )
{
	USBDeviceDescriptor desc;
	USBConfigurationDescriptorFull descfull;
	volatile uint16_t len = 0;
	uint8_t outEndpointNum = 0;

	if (do_once == 0) {
		USART_Write("\x15\x07");
		USB_OTG_BSP_mDelay(1);
		if (USART_GetChar() != 0x51) return;
		USART_Write("\x15\x06");
		USB_OTG_BSP_mDelay(10);
		if (USART_GetChar() != 0x51) return;
		USART_Write("\x46\x01");
		USB_OTG_BSP_mDelay(10);
		USART_Write("\x28");
		USB_OTG_BSP_mDelay(1);
		len = USART_GetChar() & 0x00ff;
		USART_GetString(len, (uint8_t *)&desc);
		USB_OTG_BSP_mDelay(10);
		USART_Write("\x45\x03"); // set address
		USB_OTG_BSP_mDelay(5);
		USART_Write("\x22"); // get status
		if (USART_GetChar() != 0x14) while(1);
		USB_OTG_BSP_mDelay(20);
		USART_Write("\x13\x03"); // set usb address
		USB_OTG_BSP_mDelay(5);
		USART_Write("\x46\x02"); // get full config
		USB_OTG_BSP_mDelay(10);
		USART_Write("\x28");
		USB_OTG_BSP_mDelay(1);
		len = USART_GetChar() & 0x00ff;
		USART_GetString(len, (uint8_t *)&descfull);
		USB_OTG_BSP_mDelay(10);
		USART_PutChar(0x49); // set config value
		USART_PutChar(descfull.configuration.bConfigurationValue);
		USB_OTG_BSP_mDelay(5);
		USART_Write("\x22"); // get status
		if (USART_GetChar() != 0x14) while(1);
		outEndpointNum = descfull.endpoints[1].bEndpointAddress & 0x0f;

		doBulkTransfer(outEndpointNum, "hello worldzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzyyyyyyyyyyyy!\n\n", 64);
		doBulkTransfer(outEndpointNum, "hello worldzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzyyyyyyyyyyyy!\n\n", 64);
		doBulkTransfer(outEndpointNum, "hello worldzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzyyyyyyyyyyyy!\n\n", 64);
		doBulkTransfer(outEndpointNum, "hello worldzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzyyyyyyyyyyyy!\n\n", 64);
		doBulkTransfer(outEndpointNum, "hello worldzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzyyyyyyyyyyyy!\n\n", 64);
		doBulkTransfer(outEndpointNum, "hello worldzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzyyyyyyyyyyyy!\n\n", 64);
		doBulkTransfer(outEndpointNum, "hello worldzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzyyyyyyyyyyyy!\n\n", 64);
		doBulkTransfer(outEndpointNum, "hello worldzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzyyyyyyyyyyyy!\n\n", 64);

		do_once = 1;
	}
}