📄 cdc_enumerate.c
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//* File Name : cdc_enumerate.c
//* Object : Handle CDC enumeration
#include "board.h"
#include "cdc_enumerate.h"
typedef unsigned char uchar;
typedef unsigned short ushort;
typedef unsigned int uint;
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define AT91C_EP_IN_SIZE 0x40
const char devDescriptor[] = { // 设备描述符
0x12, // bLength
0x01, // bDescriptorType
0x10, // bcdUSBL
0x01, //
0x02, // bDeviceClass: CDC class code
0x00, // bDeviceSubclass: CDC class sub code
0x00, // bDeviceProtocol: CDC Device protocol
0x08, // bMaxPacketSize0
0xEB, // idVendorL
0x03, //
0x24, // idProductL
0x61, //
0x10, // bcdDeviceL
0x01, //
0x00, // iManufacturer // 0x01
0x00, // iProduct
0x00, // SerialNumber
0x01 // bNumConfigs
};
const char cfgDescriptor[] = { // 配置描述符
0x09, // CbLength
0x02, // CbDescriptorType
0x43, // CwTotalLength 2 EP + Control
0x00,
0x02, // CbNumInterfaces
0x01, // CbConfigurationValue
0x00, // CiConfiguration
0xC0, // CbmAttributes 0xA0
0x00, // CMaxPower
/* 通信类接口描述符 */
0x09, // bLength
0x04, // bDescriptorType
0x00, // bInterfaceNumber
0x00, // bAlternateSetting
0x01, // bNumEndpoints
0x02, // bInterfaceClass
0x02, // bInterfaceSubclass
0x00, // bInterfaceProtocol
0x00, // iInterface
/* 头函数描述符 */
0x05, // bFunction Length
0x24, // bDescriptor type: CS_INTERFACE
0x00, // bDescriptor subtype: Header Func Desc
0x10, // bcdCDC:1.1
0x01,
/* ACM 函数描述符 */
0x04, // bFunctionLength
0x24, // bDescriptor Type: CS_INTERFACE
0x02, // bDescriptor Subtype: ACM Func Desc
0x00, // bmCapabilities
/* 联合函数描述符 */
0x05, // bFunctionLength
0x24, // bDescriptorType: CS_INTERFACE
0x06, // bDescriptor Subtype: Union Func Desc
0x00, // bMasterInterface: Communication Class Interface
0x01, // bSlaveInterface0: Data Class Interface
/* 调用管理函数描述符 */
0x05, // bFunctionLength
0x24, // bDescriptor Type: CS_INTERFACE
0x01, // bDescriptor Subtype: Call Management Func Desc
0x00, // bmCapabilities: D1 + D0
0x01, // bDataInterface: Data Class Interface 1
/* 端点1描述符 */
0x07, // bLength
0x05, // bDescriptorType
0x83, // bEndpointAddress, Endpoint 03 - IN
0x03, // bmAttributes INT
0x08, // wMaxPacketSize
0x00,
0xFF, // bInterval
/* 数据类接口描述符 */
0x09, // bLength
0x04, // bDescriptorType
0x01, // bInterfaceNumber
0x00, // bAlternateSetting
0x02, // bNumEndpoints
0x0A, // bInterfaceClass
0x00, // bInterfaceSubclass
0x00, // bInterfaceProtocol
0x00, // iInterface
/* 首次交替设置 */
/* 端点1描述符 */
0x07, // bLength
0x05, // bDescriptorType
0x01, // bEndpointAddress, Endpoint 01 - OUT
0x02, // bmAttributes BULK
AT91C_EP_OUT_SIZE, // wMaxPacketSize
0x00,
0x00, // bInterval
/* 端点2描述符 */
0x07, // bLength
0x05, // bDescriptorType
0x82, // bEndpointAddress, Endpoint 02 - IN
0x02, // bmAttributes BULK
AT91C_EP_IN_SIZE, // wMaxPacketSize
0x00,
0x00 // bInterval
};
/* USB标准请求代码 */
#define STD_GET_STATUS_ZERO 0x0080
#define STD_GET_STATUS_INTERFACE 0x0081
#define STD_GET_STATUS_ENDPOINT 0x0082
#define STD_CLEAR_FEATURE_ZERO 0x0100
#define STD_CLEAR_FEATURE_INTERFACE 0x0101
#define STD_CLEAR_FEATURE_ENDPOINT 0x0102
#define STD_SET_FEATURE_ZERO 0x0300
#define STD_SET_FEATURE_INTERFACE 0x0301
#define STD_SET_FEATURE_ENDPOINT 0x0302
#define STD_SET_ADDRESS 0x0500
#define STD_GET_DESCRIPTOR 0x0680
#define STD_SET_DESCRIPTOR 0x0700
#define STD_GET_CONFIGURATION 0x0880
#define STD_SET_CONFIGURATION 0x0900
#define STD_GET_INTERFACE 0x0A81
#define STD_SET_INTERFACE 0x0B01
#define STD_SYNCH_FRAME 0x0C82
/* CDC类特殊请求代码 */
#define GET_LINE_CODING 0x21A1
#define SET_LINE_CODING 0x2021
#define SET_CONTROL_LINE_STATE 0x2221
typedef struct {
unsigned int dwDTERRate;
char bCharFormat;
char bParityType;
char bDataBits;
} AT91S_CDC_LINE_CODING, *AT91PS_CDC_LINE_CODING;
AT91S_CDC_LINE_CODING line = {
115200, // 波特率
0, // 1位停止位
0, // 无校验
8}; // 8位数据
uint currentReceiveBank = AT91C_UDP_RX_DATA_BK0;
static uchar AT91F_UDP_IsConfigured(AT91PS_CDC pCdc);
static uint AT91F_UDP_Read(AT91PS_CDC pCdc, char *pData, uint length);
static uint AT91F_UDP_Write(AT91PS_CDC pCdc, const char *pData, uint length);
static void AT91F_CDC_Enumerate(AT91PS_CDC pCdc);
/*******************************************************************************
* 说明：AT91F_CDC_Open函数
*******************************************************************************/
AT91PS_CDC AT91F_CDC_Open(AT91PS_CDC pCdc, AT91PS_UDP pUdp) {
pCdc->pUdp = pUdp;
pCdc->currentConfiguration = 0;
pCdc->currentConnection = 0;
pCdc->currentRcvBank = AT91C_UDP_RX_DATA_BK0;
pCdc->IsConfigured = AT91F_UDP_IsConfigured;
pCdc->Write = AT91F_UDP_Write;
pCdc->Read = AT91F_UDP_Read;
return pCdc;
}
/*******************************************************************************
* 说明：AT91F_UDP_IsConfigured函数，测试设备配置并处理枚举
*******************************************************************************/
static uchar AT91F_UDP_IsConfigured(AT91PS_CDC pCdc) {
AT91PS_UDP pUDP = pCdc->pUdp;
AT91_REG isr = pUDP->UDP_ISR;
if (isr & AT91C_UDP_ENDBUSRES) {
pUDP->UDP_ICR = AT91C_UDP_ENDBUSRES;
pUDP->UDP_RSTEP = (unsigned int)-1; // 复位所有端点
pUDP->UDP_RSTEP = 0;
pUDP->UDP_FADDR = AT91C_UDP_FEN; // 功能允许
pUDP->UDP_CSR[0] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL); // 配置端点0
}
else if (isr & AT91C_UDP_EPINT0) {
pUDP->UDP_ICR = AT91C_UDP_EPINT0;
AT91F_CDC_Enumerate(pCdc);
}
return pCdc->currentConfiguration;
}
/*******************************************************************************
* 说明：AT91F_UDP_Read函数，从输出端点读取数据
*******************************************************************************/
static uint AT91F_UDP_Read(AT91PS_CDC pCdc, char *pData, uint length) {
AT91PS_UDP pUdp = pCdc->pUdp;
uint packetSize, nbBytesRcv = 0, currentReceiveBank = pCdc->currentRcvBank;
while (length) {
if ( !AT91F_UDP_IsConfigured(pCdc) )
break;
if ( pUdp->UDP_CSR[AT91C_EP_OUT] & currentReceiveBank ) {
packetSize = MIN(pUdp->UDP_CSR[AT91C_EP_OUT] >> 16, length);
length -= packetSize;
if (packetSize < AT91C_EP_OUT_SIZE)
length = 0;
while(packetSize--)
pData[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];
pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(currentReceiveBank);
if (currentReceiveBank == AT91C_UDP_RX_DATA_BK0)
currentReceiveBank = AT91C_UDP_RX_DATA_BK1;
else
currentReceiveBank = AT91C_UDP_RX_DATA_BK0;
}
}
pCdc->currentRcvBank = currentReceiveBank;
return nbBytesRcv;
}
/*******************************************************************************
* 说明：AT91F_UDP_Write函数，通过端点2发送数据
*******************************************************************************/
static uint AT91F_UDP_Write(AT91PS_CDC pCdc, const char *pData, uint length) {
AT91PS_UDP pUdp = pCdc->pUdp;
uint cpt = 0;
cpt = MIN(length, AT91C_EP_IN_SIZE); // 发送第一个数据包
length -= cpt;
while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *pData++;
pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
while (length) {
cpt = MIN(length, AT91C_EP_IN_SIZE); // 填充第二段
length -= cpt;
while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *pData++;
while ( !(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP) )
if ( !AT91F_UDP_IsConfigured(pCdc) ) return length;
pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
}
while ( !(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP) ) // 等待传送结束
if ( !AT91F_UDP_IsConfigured(pCdc) ) return length;
pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
return length;
}
/*******************************************************************************
* 说明：AT91F_USB_SendData函数，通过控制端点发送数据
*******************************************************************************/
unsigned int csrTab[100];
unsigned char csrIdx = 0;
static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint length) {
uint cpt = 0;
AT91_REG csr;
do {
cpt = MIN(length, 8);
length -= cpt;
while (cpt--)
pUdp->UDP_FDR[0] = *pData++;
if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
}
pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
do {
csr = pUdp->UDP_CSR[0];
if (csr & AT91C_UDP_RX_DATA_BK0) {
pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
return;
}
} while ( !(csr & AT91C_UDP_TXCOMP) );
} while (length);
if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
}
}
/*******************************************************************************
* 说明：AT91F_USB_SendZlp函数，通过控制端点发送0长度数据包
*******************************************************************************/
void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {
pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) );
pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
}
/*******************************************************************************
* 说明：AT91F_USB_SendStall函数，停止控制端点
*******************************************************************************/
void AT91F_USB_SendStall(AT91PS_UDP pUdp) {
pUdp->UDP_CSR[0] |= AT91C_UDP_FORCESTALL;
while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_ISOERROR) );
pUdp->UDP_CSR[0] &= ~(AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);
while (pUdp->UDP_CSR[0] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));
}
/*******************************************************************************
* 说明：AT91F_CDC_Enumerate函数，收到SETUP数举包时的回调函数
*******************************************************************************/
static void AT91F_CDC_Enumerate(AT91PS_CDC pCdc) {
AT91PS_UDP pUDP = pCdc->pUdp;
uchar bmRequestType, bRequest;
ushort wValue, wIndex, wLength, wStatus;
if ( !(pUDP->UDP_CSR[0] & AT91C_UDP_RXSETUP) )
return;
bmRequestType = pUDP->UDP_FDR[0];
bRequest = pUDP->UDP_FDR[0];
wValue = (pUDP->UDP_FDR[0] & 0xFF);
wValue |= (pUDP->UDP_FDR[0] << 8);
wIndex = (pUDP->UDP_FDR[0] & 0xFF);
wIndex |= (pUDP->UDP_FDR[0] << 8);
wLength = (pUDP->UDP_FDR[0] & 0xFF);
wLength |= (pUDP->UDP_FDR[0] << 8);
if (bmRequestType & 0x80) {
pUDP->UDP_CSR[0] |= AT91C_UDP_DIR;
while ( !(pUDP->UDP_CSR[0] & AT91C_UDP_DIR) );
}
pUDP->UDP_CSR[0] &= ~AT91C_UDP_RXSETUP;
while ( (pUDP->UDP_CSR[0] & AT91C_UDP_RXSETUP) );
switch ((bRequest << 8) | bmRequestType) {
case STD_GET_DESCRIPTOR:
if (wValue == 0x100) // 返回设备描述符
AT91F_USB_SendData(pUDP, devDescriptor, MIN(sizeof(devDescriptor), wLength));
else if (wValue == 0x200) // 返回配置描述符
AT91F_USB_SendData(pUDP, cfgDescriptor, MIN(sizeof(cfgDescriptor), wLength));
else
AT91F_USB_SendStall(pUDP);
break;
case STD_SET_ADDRESS:
AT91F_USB_SendZlp(pUDP);
pUDP->UDP_FADDR = (AT91C_UDP_FEN | wValue);
pUDP->UDP_GLBSTATE = (wValue) ? AT91C_UDP_FADDEN : 0;
break;
case STD_SET_CONFIGURATION:
pCdc->currentConfiguration = wValue;
AT91F_USB_SendZlp(pUDP);
pUDP->UDP_GLBSTATE = (wValue) ? AT91C_UDP_CONFG : AT91C_UDP_FADDEN;
pUDP->UDP_CSR[1] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT) : 0;
pUDP->UDP_CSR[2] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN) : 0;
pUDP->UDP_CSR[3] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_ISO_IN) : 0;
break;
case STD_GET_CONFIGURATION:
AT91F_USB_SendData(pUDP, (char *) &(pCdc->currentConfiguration), sizeof(pCdc->currentConfiguration));
break;
case STD_GET_STATUS_ZERO:
wStatus = 0;
AT91F_USB_SendData(pUDP, (char *) &wStatus, sizeof(wStatus));
break;
case STD_GET_STATUS_INTERFACE:
wStatus = 0;
AT91F_USB_SendData(pUDP, (char *) &wStatus, sizeof(wStatus));
break;
case STD_GET_STATUS_ENDPOINT:
wStatus = 0;
wIndex &= 0x0F;
if ((pUDP->UDP_GLBSTATE & AT91C_UDP_CONFG) && (wIndex <= 3)) {
wStatus = (pUDP->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
AT91F_USB_SendData(pUDP, (char *) &wStatus, sizeof(wStatus));
}
else if ((pUDP->UDP_GLBSTATE & AT91C_UDP_FADDEN) && (wIndex == 0)) {
wStatus = (pUDP->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
AT91F_USB_SendData(pUDP, (char *) &wStatus, sizeof(wStatus));
}
else
AT91F_USB_SendStall(pUDP);
break;
case STD_SET_FEATURE_ZERO:
AT91F_USB_SendStall(pUDP);
break;
case STD_SET_FEATURE_INTERFACE:
AT91F_USB_SendZlp(pUDP);
break;
case STD_SET_FEATURE_ENDPOINT:
wIndex &= 0x0F;
if ((wValue == 0) && wIndex && (wIndex <= 3)) {
pUDP->UDP_CSR[wIndex] = 0;
AT91F_USB_SendZlp(pUDP);
}
else
AT91F_USB_SendStall(pUDP);
break;
case STD_CLEAR_FEATURE_ZERO:
AT91F_USB_SendStall(pUDP);
break;
case STD_CLEAR_FEATURE_INTERFACE:
AT91F_USB_SendZlp(pUDP);
break;
case STD_CLEAR_FEATURE_ENDPOINT:
wIndex &= 0x0F;
if ((wValue == 0) && wIndex && (wIndex <= 3)) {
if (wIndex == 1)
pUDP->UDP_CSR[1] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT);
else if (wIndex == 2)
pUDP->UDP_CSR[2] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN);
else if (wIndex == 3)
pUDP->UDP_CSR[3] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_ISO_IN);
AT91F_USB_SendZlp(pUDP);
}
else
AT91F_USB_SendStall(pUDP);
break;
// 处理 CDC 类请求
case SET_LINE_CODING:
while ( !(pUDP->UDP_CSR[0] & AT91C_UDP_RX_DATA_BK0) );
pUDP->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
AT91F_USB_SendZlp(pUDP);
break;
case GET_LINE_CODING:
AT91F_USB_SendData(pUDP, (char *) &line, MIN(sizeof(line), wLength));
break;
case SET_CONTROL_LINE_STATE:
pCdc->currentConnection = wValue;
AT91F_USB_SendZlp(pUDP);
break;
default:
AT91F_USB_SendStall(pUDP);
break;
}
}
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