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Improve the efficiency of USB packet reception.

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This commit is contained in:
dxl
2025-09-23 00:32:17 +08:00
parent 50f72653db
commit d065a2f18e
1 changed files with 12 additions and 15 deletions
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firmware/application/src/usb_main.c
+12 -15
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@@ -40,19 +40,19 @@ APP_USBD_CDC_ACM_GLOBAL_DEF(m_app_cdc_acm,
volatile bool g_usb_connected = false;
volatile bool g_usb_port_opened = false;
volatile bool g_usb_led_marquee_enable = true;
static uint8_t cdc_data_buffer[NRF_DRV_USBD_EPSIZE];
/** @brief User event handler @ref app_usbd_cdc_acm_user_ev_handler_t */
static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const *p_inst, app_usbd_cdc_acm_user_event_t event) {
static uint8_t cdc_data_buffer[1];
// app_usbd_cdc_acm_t const *p_cdc_acm = app_usbd_cdc_acm_class_get(p_inst);
switch (event) {
case APP_USBD_CDC_ACM_USER_EVT_PORT_OPEN: {
/*
*theProbabilityOfTheEntireUsbReceivingDataIsTheAppUsbdCdcAcmRead *AppUsbdCdcAcmReadFunctionIsNotASeriousReception,ItIsGivenAPointer,AndThenWaitForTheUsbBuffer *SoYouNeedToInitializeTheHeadPointerFirstWhenTheAppUsbdCdcAcmUserEvtPortOpenIsInitialized *IfTheAppUsbdCdcAcmUserEvtRxDoneUsesASubscribed0ToAccessTheBuffer,ItWillCauseTheFirstByteToLoseTheFirstSendEssence
*/
ret_code_t ret = app_usbd_cdc_acm_read(&m_app_cdc_acm, cdc_data_buffer, 1);
// Setup first transfer
ret_code_t ret = app_usbd_cdc_acm_read_any(&m_app_cdc_acm, cdc_data_buffer, sizeof(cdc_data_buffer));
UNUSED_VARIABLE(ret);
NRF_LOG_INFO("CDC ACM port opened");
g_usb_port_opened = true;
break;
@@ -68,16 +68,13 @@ static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const *p_inst, app_usb
break;
case APP_USBD_CDC_ACM_USER_EVT_RX_DONE: {
ret_code_t ret;
//Take out the first byte first
data_frame_receive(cdc_data_buffer, 1);
do {
ret = app_usbd_cdc_acm_read(&m_app_cdc_acm, cdc_data_buffer, 1);
if (ret == NRF_SUCCESS) {
// The byte after success
data_frame_receive(cdc_data_buffer, 1);
}
} while (ret == NRF_SUCCESS);
// Get amount of data transfered to process data
size_t size = app_usbd_cdc_acm_rx_size(&m_app_cdc_acm);
data_frame_receive(cdc_data_buffer, size);
// Setup next transfer
ret_code_t ret = app_usbd_cdc_acm_read_any(&m_app_cdc_acm, cdc_data_buffer, sizeof(cdc_data_buffer));
UNUSED_VARIABLE(ret);
break;
}
default: