flipperzero-firmware/firmware/targets/f6/api-hal/api-hal-vcp.c

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#include <api-hal-vcp.h>
#include <usbd_cdc_if.h>
#include <furi.h>
#include <stream_buffer.h>
#define API_HAL_VCP_RX_BUFFER_SIZE 600
typedef struct {
StreamBufferHandle_t rx_stream;
osSemaphoreId_t tx_semaphore;
volatile bool alive;
volatile bool underrun;
} ApiHalVcp;
static ApiHalVcp* api_hal_vcp = NULL;
static const uint8_t ascii_soh = 0x01;
static const uint8_t ascii_eot = 0x04;
void _api_hal_vcp_init();
void _api_hal_vcp_deinit();
void _api_hal_vcp_control_line(uint8_t state);
void _api_hal_vcp_rx_callback(const uint8_t* buffer, size_t size);
void _api_hal_vcp_tx_complete(size_t size);
void api_hal_vcp_init() {
api_hal_vcp = furi_alloc(sizeof(ApiHalVcp));
api_hal_vcp->rx_stream = xStreamBufferCreate(API_HAL_VCP_RX_BUFFER_SIZE, 1);
api_hal_vcp->tx_semaphore = osSemaphoreNew(1, 1, NULL);
api_hal_vcp->alive = false;
api_hal_vcp->underrun = false;
FURI_LOG_I("FuriHalVcp", "Init OK");
}
void _api_hal_vcp_init() {
osSemaphoreRelease(api_hal_vcp->tx_semaphore);
}
void _api_hal_vcp_deinit() {
api_hal_vcp->alive = false;
osSemaphoreRelease(api_hal_vcp->tx_semaphore);
}
void _api_hal_vcp_control_line(uint8_t state) {
// bit 0: DTR state, bit 1: RTS state
// bool dtr = state & 0b01;
bool dtr = state & 0b1;
if (dtr) {
if (!api_hal_vcp->alive) {
api_hal_vcp->alive = true;
_api_hal_vcp_rx_callback(&ascii_soh, 1); // SOH
}
} else {
if (api_hal_vcp->alive) {
_api_hal_vcp_rx_callback(&ascii_eot, 1); // EOT
api_hal_vcp->alive = false;
}
}
osSemaphoreRelease(api_hal_vcp->tx_semaphore);
}
void _api_hal_vcp_rx_callback(const uint8_t* buffer, size_t size) {
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
size_t ret = xStreamBufferSendFromISR(api_hal_vcp->rx_stream, buffer, size, &xHigherPriorityTaskWoken);
if (ret != size) {
api_hal_vcp->underrun = true;
}
portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
}
void _api_hal_vcp_tx_complete(size_t size) {
osSemaphoreRelease(api_hal_vcp->tx_semaphore);
}
size_t api_hal_vcp_rx(uint8_t* buffer, size_t size) {
furi_assert(api_hal_vcp);
return xStreamBufferReceive(api_hal_vcp->rx_stream, buffer, size, portMAX_DELAY);
}
size_t api_hal_vcp_rx_with_timeout(uint8_t* buffer, size_t size, uint32_t timeout) {
furi_assert(api_hal_vcp);
return xStreamBufferReceive(api_hal_vcp->rx_stream, buffer, size, timeout);
}
void api_hal_vcp_tx(const uint8_t* buffer, size_t size) {
furi_assert(api_hal_vcp);
while (size > 0 && api_hal_vcp->alive) {
furi_check(osSemaphoreAcquire(api_hal_vcp->tx_semaphore, osWaitForever) == osOK);
size_t batch_size = size;
if (batch_size > APP_TX_DATA_SIZE) {
batch_size = APP_TX_DATA_SIZE;
}
if (CDC_Transmit_FS((uint8_t*)buffer, batch_size) == USBD_OK) {
size -= batch_size;
buffer += batch_size;
} else {
// Shouldn't be there
osDelay(100);
}
}
}