flipperzero-firmware/firmware/targets/f7/ble-glue/serial_service.c

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#include "serial_service.h"
#include "app_common.h"
#include "ble.h"
#include <furi.h>
#define TAG "BtSerialSvc"
typedef struct {
uint16_t svc_handle;
uint16_t rx_char_handle;
uint16_t tx_char_handle;
uint16_t flow_ctrl_char_handle;
osMutexId_t buff_size_mtx;
uint32_t buff_size;
uint16_t bytes_ready_to_receive;
SerialServiceEventCallback callback;
void* context;
} SerialSvc;
static SerialSvc* serial_svc = NULL;
static const uint8_t service_uuid[] = {0x00, 0x00, 0xfe, 0x60, 0xcc, 0x7a, 0x48, 0x2a, 0x98, 0x4a, 0x7f, 0x2e, 0xd5, 0xb3, 0xe5, 0x8f};
static const uint8_t char_tx_uuid[] = {0x00, 0x00, 0xfe, 0x61, 0x8e, 0x22, 0x45, 0x41, 0x9d, 0x4c, 0x21, 0xed, 0xae, 0x82, 0xed, 0x19};
static const uint8_t char_rx_uuid[] = {0x00, 0x00, 0xfe, 0x62, 0x8e, 0x22, 0x45, 0x41, 0x9d, 0x4c, 0x21, 0xed, 0xae, 0x82, 0xed, 0x19};
static const uint8_t flow_ctrl_uuid[] = {0x00, 0x00, 0xfe, 0x63, 0x8e, 0x22, 0x45, 0x41, 0x9d, 0x4c, 0x21, 0xed, 0xae, 0x82, 0xed, 0x19};
static SVCCTL_EvtAckStatus_t serial_svc_event_handler(void *event) {
SVCCTL_EvtAckStatus_t ret = SVCCTL_EvtNotAck;
hci_event_pckt* event_pckt = (hci_event_pckt *)(((hci_uart_pckt*)event)->data);
evt_blecore_aci* blecore_evt = (evt_blecore_aci*)event_pckt->data;
aci_gatt_attribute_modified_event_rp0* attribute_modified;
if(event_pckt->evt == HCI_VENDOR_SPECIFIC_DEBUG_EVT_CODE) {
if(blecore_evt->ecode == ACI_GATT_ATTRIBUTE_MODIFIED_VSEVT_CODE) {
attribute_modified = (aci_gatt_attribute_modified_event_rp0*)blecore_evt->data;
if(attribute_modified->Attr_Handle == serial_svc->rx_char_handle + 2) {
// Descriptor handle
ret = SVCCTL_EvtAckFlowEnable;
FURI_LOG_D(TAG, "RX descriptor event");
} else if(attribute_modified->Attr_Handle == serial_svc->rx_char_handle + 1) {
FURI_LOG_D(TAG, "Received %d bytes", attribute_modified->Attr_Data_Length);
if(serial_svc->callback) {
furi_check(osMutexAcquire(serial_svc->buff_size_mtx, osWaitForever) == osOK);
if(attribute_modified->Attr_Data_Length > serial_svc->bytes_ready_to_receive) {
FURI_LOG_W(
TAG, "Received %d, while was ready to receive %d bytes. Can lead to buffer overflow!",
attribute_modified->Attr_Data_Length, serial_svc->bytes_ready_to_receive);
}
serial_svc->bytes_ready_to_receive -= MIN(serial_svc->bytes_ready_to_receive, attribute_modified->Attr_Data_Length);
SerialServiceEvent event = {
.event = SerialServiceEventTypeDataReceived,
.data = {
.buffer = attribute_modified->Attr_Data,
.size = attribute_modified->Attr_Data_Length,
}
};
uint32_t buff_free_size =
serial_svc->callback(event, serial_svc->context);
FURI_LOG_D(TAG, "Available buff size: %d", buff_free_size);
furi_check(osMutexRelease(serial_svc->buff_size_mtx) == osOK);
}
ret = SVCCTL_EvtAckFlowEnable;
}
} else if(blecore_evt->ecode == ACI_GATT_SERVER_CONFIRMATION_VSEVT_CODE) {
FURI_LOG_T(TAG, "Ack received", blecore_evt->ecode);
if(serial_svc->callback) {
SerialServiceEvent event = {
.event = SerialServiceEventTypeDataSent,
};
serial_svc->callback(event, serial_svc->context);
}
ret = SVCCTL_EvtAckFlowEnable;
}
}
return ret;
}
void serial_svc_start() {
tBleStatus status;
serial_svc = furi_alloc(sizeof(SerialSvc));
// Register event handler
SVCCTL_RegisterSvcHandler(serial_svc_event_handler);
// Add service
status = aci_gatt_add_service(UUID_TYPE_128, (Service_UUID_t *)service_uuid, PRIMARY_SERVICE, 10, &serial_svc->svc_handle);
if(status) {
FURI_LOG_E(TAG, "Failed to add Serial service: %d", status);
}
// Add RX characteristics
status = aci_gatt_add_char(serial_svc->svc_handle, UUID_TYPE_128, (const Char_UUID_t*)char_rx_uuid,
SERIAL_SVC_DATA_LEN_MAX,
CHAR_PROP_WRITE_WITHOUT_RESP | CHAR_PROP_WRITE | CHAR_PROP_READ,
ATTR_PERMISSION_AUTHEN_READ | ATTR_PERMISSION_AUTHEN_WRITE,
GATT_NOTIFY_ATTRIBUTE_WRITE,
10,
CHAR_VALUE_LEN_VARIABLE,
&serial_svc->rx_char_handle);
if(status) {
FURI_LOG_E(TAG, "Failed to add RX characteristic: %d", status);
}
// Add TX characteristic
status = aci_gatt_add_char(serial_svc->svc_handle, UUID_TYPE_128, (const Char_UUID_t*)char_tx_uuid,
SERIAL_SVC_DATA_LEN_MAX,
CHAR_PROP_READ | CHAR_PROP_INDICATE,
ATTR_PERMISSION_AUTHEN_READ,
GATT_DONT_NOTIFY_EVENTS,
10,
CHAR_VALUE_LEN_VARIABLE,
&serial_svc->tx_char_handle);
if(status) {
FURI_LOG_E(TAG, "Failed to add TX characteristic: %d", status);
}
// Add Flow Control characteristic
status = aci_gatt_add_char(serial_svc->svc_handle, UUID_TYPE_128, (const Char_UUID_t*)flow_ctrl_uuid,
sizeof(uint32_t),
CHAR_PROP_READ | CHAR_PROP_NOTIFY,
ATTR_PERMISSION_AUTHEN_READ,
GATT_DONT_NOTIFY_EVENTS,
10,
CHAR_VALUE_LEN_CONSTANT,
&serial_svc->flow_ctrl_char_handle);
if(status) {
FURI_LOG_E(TAG, "Failed to add Flow Control characteristic: %d", status);
}
// Allocate buffer size mutex
serial_svc->buff_size_mtx = osMutexNew(NULL);
}
void serial_svc_set_callbacks(uint16_t buff_size, SerialServiceEventCallback callback, void* context) {
furi_assert(serial_svc);
serial_svc->callback = callback;
serial_svc->context = context;
serial_svc->buff_size = buff_size;
serial_svc->bytes_ready_to_receive = buff_size;
uint32_t buff_size_reversed = REVERSE_BYTES_U32(serial_svc->buff_size);
aci_gatt_update_char_value(serial_svc->svc_handle, serial_svc->flow_ctrl_char_handle, 0, sizeof(uint32_t), (uint8_t*)&buff_size_reversed);
}
void serial_svc_notify_buffer_is_empty() {
furi_assert(serial_svc);
furi_assert(serial_svc->buff_size_mtx);
furi_check(osMutexAcquire(serial_svc->buff_size_mtx, osWaitForever) == osOK);
if(serial_svc->bytes_ready_to_receive == 0) {
FURI_LOG_D(TAG, "Buffer is empty. Notifying client");
serial_svc->bytes_ready_to_receive = serial_svc->buff_size;
uint32_t buff_size_reversed = REVERSE_BYTES_U32(serial_svc->buff_size);
aci_gatt_update_char_value(serial_svc->svc_handle, serial_svc->flow_ctrl_char_handle, 0, sizeof(uint32_t), (uint8_t*)&buff_size_reversed);
}
furi_check(osMutexRelease(serial_svc->buff_size_mtx) == osOK);
}
void serial_svc_stop() {
tBleStatus status;
if(serial_svc) {
// Delete characteristics
status = aci_gatt_del_char(serial_svc->svc_handle, serial_svc->tx_char_handle);
if(status) {
FURI_LOG_E(TAG, "Failed to delete TX characteristic: %d", status);
}
status = aci_gatt_del_char(serial_svc->svc_handle, serial_svc->rx_char_handle);
if(status) {
FURI_LOG_E(TAG, "Failed to delete RX characteristic: %d", status);
}
status = aci_gatt_del_char(serial_svc->svc_handle, serial_svc->flow_ctrl_char_handle);
if(status) {
FURI_LOG_E(TAG, "Failed to delete Flow Control characteristic: %d", status);
}
// Delete service
status = aci_gatt_del_service(serial_svc->svc_handle);
if(status) {
FURI_LOG_E(TAG, "Failed to delete Serial service: %d", status);
}
// Delete buffer size mutex
osMutexDelete(serial_svc->buff_size_mtx);
free(serial_svc);
serial_svc = NULL;
}
}
bool serial_svc_is_started() {
return serial_svc != NULL;
}
bool serial_svc_update_tx(uint8_t* data, uint16_t data_len) {
if(data_len > SERIAL_SVC_DATA_LEN_MAX) {
return false;
}
for(uint16_t remained = data_len; remained > 0;) {
uint8_t value_len = MIN(SERIAL_SVC_CHAR_VALUE_LEN_MAX, remained);
uint16_t value_offset = data_len - remained;
remained -= value_len;
tBleStatus result = aci_gatt_update_char_value_ext(
0,
serial_svc->svc_handle,
serial_svc->tx_char_handle,
remained ? 0x00 : 0x02,
data_len,
value_offset,
value_len,
data + value_offset);
if(result) {
FURI_LOG_E(TAG, "Failed updating TX characteristic: %d", result);
return false;
}
}
return true;
}