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Refactor USB serial ring buffer code

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This commit is contained in:
Steve Evans 2022-07-21 23:19:02 +01:00
parent 8b258bc2ad
commit a3a3b74fd5
4 changed files with 97 additions and 139 deletions
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195
lib/main/STM32_USB_Device_Library/Class/cdc/src/usbd_cdc_core.c
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@ -184,9 +184,9 @@ __ALIGN_BEGIN uint8_t APP_Rx_Buffer [APP_RX_DATA_SIZE] __ALIGN_END ;
#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */
__ALIGN_BEGIN uint8_t CmdBuff[CDC_CMD_PACKET_SZE] __ALIGN_END ;
uint32_t APP_Rx_ptr_in = 0;
uint32_t APP_Rx_ptr_out = 0;
uint32_t APP_Rx_length = 0;
volatile uint32_t APP_Rx_ptr_in = 0;
volatile uint32_t APP_Rx_ptr_out = 0;
volatile uint32_t APP_Rx_length = 0;
uint8_t USB_Tx_State = USB_CDC_IDLE;
@ -482,8 +482,8 @@ uint8_t usbd_cdc_Init (void *pdev,
uint8_t usbd_cdc_DeInit (void *pdev,
uint8_t cfgidx)
{
(void)pdev;
(void)cfgidx;
(void)pdev;
(void)cfgidx;
/* Open EP IN */
DCD_EP_Close(pdev,
CDC_IN_EP);
@ -594,7 +594,7 @@ uint8_t usbd_cdc_Setup (void *pdev,
*/
uint8_t usbd_cdc_EP0_RxReady (void *pdev)
{
(void)pdev;
(void)pdev;
if (cdcCmd != NO_CMD)
{
/* Process the data */
@ -617,60 +617,45 @@ uint8_t usbd_cdc_EP0_RxReady (void *pdev)
*/
uint8_t usbd_cdc_DataIn (void *pdev, uint8_t epnum)
{
(void)pdev;
(void)epnum;
uint16_t USB_Tx_ptr;
uint16_t USB_Tx_length;
if (USB_Tx_State == USB_CDC_BUSY)
{
if (APP_Rx_length == 0)
(void)pdev;
(void)epnum;
uint16_t USB_Tx_length;
if (USB_Tx_State == USB_CDC_BUSY)
{
USB_Tx_State = USB_CDC_IDLE;
}
else
{
if (APP_Rx_length > CDC_DATA_IN_PACKET_SIZE){
USB_Tx_ptr = APP_Rx_ptr_out;
USB_Tx_length = CDC_DATA_IN_PACKET_SIZE;
APP_Rx_ptr_out += CDC_DATA_IN_PACKET_SIZE;
APP_Rx_length -= CDC_DATA_IN_PACKET_SIZE;
}
else
{
USB_Tx_ptr = APP_Rx_ptr_out;
USB_Tx_length = APP_Rx_length;
APP_Rx_ptr_out += APP_Rx_length;
APP_Rx_length = 0;
if(USB_Tx_length == CDC_DATA_IN_PACKET_SIZE)
if (APP_Rx_length == 0)
{
USB_Tx_State = USB_CDC_ZLP;
USB_Tx_State = USB_CDC_IDLE;
} else {
if (APP_Rx_length > CDC_DATA_IN_PACKET_SIZE) {
USB_Tx_length = CDC_DATA_IN_PACKET_SIZE;
} else {
USB_Tx_length = APP_Rx_length;
if (USB_Tx_length == CDC_DATA_IN_PACKET_SIZE) {
USB_Tx_State = USB_CDC_ZLP;
}
}
/* Prepare the available data buffer to be sent on IN endpoint */
DCD_EP_Tx(pdev, CDC_IN_EP, (uint8_t*)&APP_Rx_Buffer[APP_Rx_ptr_out], USB_Tx_length);
// Advance the out pointer
APP_Rx_ptr_out = (APP_Rx_ptr_out + USB_Tx_length) % APP_RX_DATA_SIZE;;
APP_Rx_length -= USB_Tx_length;
return USBD_OK;
}
}
/* Prepare the available data buffer to be sent on IN endpoint */
DCD_EP_Tx (pdev,
CDC_IN_EP,
(uint8_t*)&APP_Rx_Buffer[USB_Tx_ptr],
USB_Tx_length);
return USBD_OK;
}
}
/* Avoid any asynchronous transfer during ZLP */
if (USB_Tx_State == USB_CDC_ZLP)
{
/*Send ZLP to indicate the end of the current transfer */
DCD_EP_Tx (pdev,
CDC_IN_EP,
NULL,
0);
USB_Tx_State = USB_CDC_IDLE;
}
return USBD_OK;
/* Avoid any asynchronous transfer during ZLP */
if (USB_Tx_State == USB_CDC_ZLP) {
/*Send ZLP to indicate the end of the current transfer */
DCD_EP_Tx(pdev, CDC_IN_EP, NULL, 0);
USB_Tx_State = USB_CDC_IDLE;
}
return USBD_OK;
}
/**
@ -731,67 +716,49 @@ uint8_t usbd_cdc_SOF (void *pdev)
*/
static void Handle_USBAsynchXfer (void *pdev)
{
uint16_t USB_Tx_ptr;
uint16_t USB_Tx_length;
if(USB_Tx_State == USB_CDC_IDLE)
{
if (APP_Rx_ptr_out == APP_RX_DATA_SIZE)
{
APP_Rx_ptr_out = 0;
}
if(APP_Rx_ptr_out == APP_Rx_ptr_in)
{
USB_Tx_State = USB_CDC_IDLE;
return;
}
if(APP_Rx_ptr_out > APP_Rx_ptr_in) /* rollback */
{
APP_Rx_length = APP_RX_DATA_SIZE - APP_Rx_ptr_out;
}
else
{
APP_Rx_length = APP_Rx_ptr_in - APP_Rx_ptr_out;
}
uint16_t USB_Tx_length;
if (USB_Tx_State == USB_CDC_IDLE) {
if (APP_Rx_ptr_out == APP_Rx_ptr_in) {
// Ring buffer is empty
return;
}
if (APP_Rx_ptr_out > APP_Rx_ptr_in) {
// Transfer bytes up to the end of the ring buffer
APP_Rx_length = APP_RX_DATA_SIZE - APP_Rx_ptr_out;
} else {
// Transfer all bytes in ring buffer
APP_Rx_length = APP_Rx_ptr_in - APP_Rx_ptr_out;
}
#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED
APP_Rx_length &= ~0x03;
// Only transfer whole 32 bit words of data
APP_Rx_length &= ~0x03;
#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */
if (APP_Rx_length > CDC_DATA_IN_PACKET_SIZE) {
USB_Tx_length = CDC_DATA_IN_PACKET_SIZE;
USB_Tx_State = USB_CDC_BUSY;
} else {
USB_Tx_length = APP_Rx_length;
if (USB_Tx_length == CDC_DATA_IN_PACKET_SIZE) {
USB_Tx_State = USB_CDC_ZLP;
} else {
USB_Tx_State = USB_CDC_BUSY;
}
}
if (APP_Rx_length > CDC_DATA_IN_PACKET_SIZE)
{
USB_Tx_ptr = APP_Rx_ptr_out;
USB_Tx_length = CDC_DATA_IN_PACKET_SIZE;
APP_Rx_ptr_out += CDC_DATA_IN_PACKET_SIZE;
APP_Rx_length -= CDC_DATA_IN_PACKET_SIZE;
USB_Tx_State = USB_CDC_BUSY;
DCD_EP_Tx (pdev,
CDC_IN_EP,
(uint8_t*)&APP_Rx_Buffer[APP_Rx_ptr_out],
USB_Tx_length);
APP_Rx_ptr_out = (APP_Rx_ptr_out + USB_Tx_length) % APP_RX_DATA_SIZE;
APP_Rx_length -= USB_Tx_length;
}
else
{
USB_Tx_ptr = APP_Rx_ptr_out;
USB_Tx_length = APP_Rx_length;
APP_Rx_ptr_out += APP_Rx_length;
APP_Rx_length = 0;
if(USB_Tx_length == CDC_DATA_IN_PACKET_SIZE)
{
USB_Tx_State = USB_CDC_ZLP;
}
else
{
USB_Tx_State = USB_CDC_BUSY;
}
}
DCD_EP_Tx (pdev,
CDC_IN_EP,
(uint8_t*)&APP_Rx_Buffer[USB_Tx_ptr],
USB_Tx_length);
}
}
/**
@ -803,7 +770,7 @@ static void Handle_USBAsynchXfer (void *pdev)
*/
static uint8_t *USBD_cdc_GetCfgDesc (uint8_t speed, uint16_t *length)
{
(void)speed;
(void)speed;
*length = sizeof (usbd_cdc_CfgDesc);
return usbd_cdc_CfgDesc;
}