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mbed-os/components/BLE/COMPONENT_BlueNRG_MS/BlueNrgMsHCIDriver.cpp

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/*
* Copyright (c) 2017-2020 ARM Limited
* Copyright (c) 2017-2020 STMicroelectronics
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
// drivers
#include "drivers/DigitalOut.h"
#include "drivers/SPI.h"
#include "drivers/InterruptIn.h"
// platform
#include "platform/mbed_wait_api.h"
// FEATURE_BLE/targets/TARGET_CORDIO
#include "CordioBLE.h"
#include "CordioHCIDriver.h"
#include "CordioHCITransportDriver.h"
#include "hci_api.h"
#include "hci_cmd.h"
#include "hci_core.h"
#include "dm_api.h"
#include "bstream.h"
#include "hci_mbed_os_adaptation.h"
// rtos
#include "Thread.h"
#include "Semaphore.h"
#include "Mutex.h"
#define HCI_RESET_RAND_CNT 4
#define VENDOR_SPECIFIC_EVENT 0xFF
#define EVT_BLUENRG_MS_INITIALIZED 0x0001
#define ACI_READ_CONFIG_DATA_OPCODE 0xFC0D
#define ACI_WRITE_CONFIG_DATA_OPCODE 0xFC0C
#define ACI_GATT_INIT_OPCODE 0xFD01
#define ACI_GAP_INIT_OPCODE 0xFC8A
#define PUBLIC_ADDRESS_OFFSET 0x00
#define RANDOM_STATIC_ADDRESS_OFFSET 0x80
#define LL_WITHOUT_HOST_OFFSET 0x2C
#define ROLE_OFFSET 0x2D
#define SPI_STACK_SIZE 1024
namespace ble {
namespace vendor {
namespace bluenrg_ms {
/**
* BlueNRG_MS HCI driver implementation.
* @see cordio::CordioHCIDriver
*/
class HCIDriver : public cordio::CordioHCIDriver {
public:
/**
* Construction of the BlueNRG_MS HCIDriver.
* @param transport: Transport of the HCI commands.
* @param rst: Name of the reset pin
*/
HCIDriver(cordio::CordioHCITransportDriver &transport_driver, PinName rst) :
cordio::CordioHCIDriver(transport_driver), rst(rst) { }
/**
* @see CordioHCIDriver::do_initialize
*/
virtual void do_initialize()
{
bluenrg_ms_reset();
}
/**
* @see CordioHCIDriver::get_buffer_pool_description
*/
ble::vendor::cordio::buf_pool_desc_t get_buffer_pool_description()
{
// Use default buffer pool
return ble::vendor::cordio::CordioHCIDriver::get_default_buffer_pool_description();
}
/**
* @see CordioHCIDriver::start_reset_sequence
*/
virtual void start_reset_sequence()
{
reset_received = false;
bluenrg_ms_initialized = false;
enable_link_layer_mode_ongoing = false;
/* send an HCI Reset command to start the sequence */
HciResetCmd();
}
/**
* @see CordioHCIDriver::do_terminate
*/
virtual void do_terminate()
{
}
/**
* @see CordioHCIDriver::handle_reset_sequence
*/
virtual void handle_reset_sequence(uint8_t *pMsg)
{
uint16_t opcode;
static uint8_t randCnt;
/* if event is a command complete event */
if (*pMsg == HCI_CMD_CMPL_EVT) {
/* parse parameters */
pMsg += HCI_EVT_HDR_LEN;
pMsg++; /* skip num packets */
BSTREAM_TO_UINT16(opcode, pMsg);
pMsg++; /* skip status */
/* decode opcode */
switch (opcode) {
case HCI_OPCODE_RESET: {
/* initialize rand command count */
randCnt = 0;
reset_received = true;
// bluenrg_ms_initialized event has to come after the hci reset event
bluenrg_ms_initialized = false;
}
break;
// ACL packet
case ACI_WRITE_CONFIG_DATA_OPCODE:
if (enable_link_layer_mode_ongoing) {
enable_link_layer_mode_ongoing = false;
aciSetRole();
} else {
aciGattInit();
}
break;
case ACI_GATT_INIT_OPCODE:
aciGapInit();
break;
case ACI_GAP_INIT_OPCODE:
aciReadConfigParameter(RANDOM_STATIC_ADDRESS_OFFSET);
break;
case ACI_READ_CONFIG_DATA_OPCODE:
// note: will send the HCI command to send the random address
set_random_static_address(pMsg);
break;
case HCI_OPCODE_LE_SET_RAND_ADDR:
HciSetEventMaskCmd((uint8_t *) hciEventMask);
break;
case HCI_OPCODE_SET_EVENT_MASK:
/* send next command in sequence */
HciLeSetEventMaskCmd((uint8_t *) hciLeEventMask);
break;
case HCI_OPCODE_LE_SET_EVENT_MASK:
// Note: the public address is not read because there is no valid public address provisioned by default on the target
// You can enable it thanks to json "valid-public-bd-address" config value
#if MBED_CONF_BLUENRG_MS_VALID_PUBLIC_BD_ADDRESS == 1
/* send next command in sequence */
HciReadBdAddrCmd();
break;
case HCI_OPCODE_READ_BD_ADDR:
/* parse and store event parameters */
BdaCpy(hciCoreCb.bdAddr, pMsg);
/* send next command in sequence */
#endif
HciLeReadBufSizeCmd();
break;
case HCI_OPCODE_LE_READ_BUF_SIZE:
/* parse and store event parameters */
BSTREAM_TO_UINT16(hciCoreCb.bufSize, pMsg);
BSTREAM_TO_UINT8(hciCoreCb.numBufs, pMsg);
/* initialize ACL buffer accounting */
hciCoreCb.availBufs = hciCoreCb.numBufs;
/* send next command in sequence */
HciLeReadSupStatesCmd();
break;
case HCI_OPCODE_LE_READ_SUP_STATES:
/* parse and store event parameters */
memcpy(hciCoreCb.leStates, pMsg, HCI_LE_STATES_LEN);
/* send next command in sequence */
HciLeReadWhiteListSizeCmd();
break;
case HCI_OPCODE_LE_READ_WHITE_LIST_SIZE:
/* parse and store event parameters */
BSTREAM_TO_UINT8(hciCoreCb.whiteListSize, pMsg);
/* send next command in sequence */
HciLeReadLocalSupFeatCmd();
break;
case HCI_OPCODE_LE_READ_LOCAL_SUP_FEAT:
/* parse and store event parameters */
BSTREAM_TO_UINT16(hciCoreCb.leSupFeat, pMsg);
/* send next command in sequence */
hciCoreReadResolvingListSize();
break;
case HCI_OPCODE_LE_READ_RES_LIST_SIZE:
/* parse and store event parameters */
BSTREAM_TO_UINT8(hciCoreCb.resListSize, pMsg);
/* send next command in sequence */
hciCoreReadMaxDataLen();
break;
case HCI_OPCODE_LE_READ_MAX_DATA_LEN: {
uint16_t maxTxOctets;
uint16_t maxTxTime;
BSTREAM_TO_UINT16(maxTxOctets, pMsg);
BSTREAM_TO_UINT16(maxTxTime, pMsg);
/* use Controller's maximum supported payload octets and packet duration times
* for transmission as Host's suggested values for maximum transmission number
* of payload octets and maximum packet transmission time for new connections.
*/
HciLeWriteDefDataLen(maxTxOctets, maxTxTime);
}
break;
case HCI_OPCODE_LE_WRITE_DEF_DATA_LEN:
if (hciCoreCb.extResetSeq) {
/* send first extended command */
(*hciCoreCb.extResetSeq)(pMsg, opcode);
} else {
/* initialize extended parameters */
hciCoreCb.maxAdvDataLen = 0;
hciCoreCb.numSupAdvSets = 0;
hciCoreCb.perAdvListSize = 0;
/* send next command in sequence */
HciLeRandCmd();
}
break;
case HCI_OPCODE_LE_READ_MAX_ADV_DATA_LEN:
case HCI_OPCODE_LE_READ_NUM_SUP_ADV_SETS:
case HCI_OPCODE_LE_READ_PER_ADV_LIST_SIZE:
if (hciCoreCb.extResetSeq) {
/* send next extended command in sequence */
(*hciCoreCb.extResetSeq)(pMsg, opcode);
}
break;
case HCI_OPCODE_LE_RAND:
/* check if need to send second rand command */
if (randCnt < (HCI_RESET_RAND_CNT - 1)) {
randCnt++;
HciLeRandCmd();
} else {
signal_reset_sequence_done();
}
break;
default:
break;
}
} else {
/**
* vendor specific event
*/
if (pMsg[0] == VENDOR_SPECIFIC_EVENT) {
/* parse parameters */
pMsg += HCI_EVT_HDR_LEN;
BSTREAM_TO_UINT16(opcode, pMsg);
if (opcode == EVT_BLUENRG_MS_INITIALIZED) {
if (bluenrg_ms_initialized) {
return;
}
bluenrg_ms_initialized = true;
if (reset_received) {
aciEnableLinkLayerModeOnly();
}
}
}
}
}
private:
void aciEnableLinkLayerModeOnly()
{
uint8_t data[1] = { 0x01 };
enable_link_layer_mode_ongoing = true;
aciWriteConfigData(LL_WITHOUT_HOST_OFFSET, data);
}
void aciSetRole()
{
// master and slave, simultaneous advertising and scanning
// (up to 4 connections)
uint8_t data[1] = { 0x04 };
aciWriteConfigData(ROLE_OFFSET, data);
}
void aciGattInit()
{
uint8_t *pBuf = hciCmdAlloc(ACI_GATT_INIT_OPCODE, 0);
if (!pBuf) {
return;
}
hciCmdSend(pBuf);
}
void aciGapInit()
{
uint8_t *pBuf = hciCmdAlloc(ACI_GAP_INIT_OPCODE, 3);
if (!pBuf) {
return;
}
pBuf[3] = 0xF;
pBuf[4] = 0;
pBuf[5] = 0;
hciCmdSend(pBuf);
}
void aciReadConfigParameter(uint8_t offset)
{
uint8_t *pBuf = hciCmdAlloc(ACI_READ_CONFIG_DATA_OPCODE, 1);
if (!pBuf) {
return;
}
pBuf[3] = offset;
hciCmdSend(pBuf);
}
template<size_t N>
void aciWriteConfigData(uint8_t offset, uint8_t (&buf)[N])
{
uint8_t *pBuf = hciCmdAlloc(ACI_WRITE_CONFIG_DATA_OPCODE, 2 + N);
if (!pBuf) {
return;
}
pBuf[3] = offset;
pBuf[4] = N;
memcpy(pBuf + 5, buf, N);
hciCmdSend(pBuf);
}
void hciCoreReadResolvingListSize(void)
{
/* if LL Privacy is supported by Controller and included */
if ((hciCoreCb.leSupFeat & HCI_LE_SUP_FEAT_PRIVACY) &&
(hciLeSupFeatCfg & HCI_LE_SUP_FEAT_PRIVACY)) {
/* send next command in sequence */
HciLeReadResolvingListSize();
} else {
hciCoreCb.resListSize = 0;
/* send next command in sequence */
hciCoreReadMaxDataLen();
}
}
void hciCoreReadMaxDataLen(void)
{
/* if LE Data Packet Length Extensions is supported by Controller and included */
if ((hciCoreCb.leSupFeat & HCI_LE_SUP_FEAT_DATA_LEN_EXT) &&
(hciLeSupFeatCfg & HCI_LE_SUP_FEAT_DATA_LEN_EXT)) {
/* send next command in sequence */
HciLeReadMaxDataLen();
} else {
/* send next command in sequence */
HciLeRandCmd();
}
}
void bluenrg_ms_reset()
{
/* Reset BlueNRG_MS SPI interface. Hold reset line to 0 for 1500ms */
rst = 0;
wait_us(1500);
rst = 1;
/* Wait for the radio to come back up */
wait_us(100000);
}
mbed::DigitalOut rst;
bool reset_received;
bool bluenrg_ms_initialized;
bool enable_link_layer_mode_ongoing;
};
/**
* Transport driver of the ST BlueNRG_MS shield.
* @important: With that driver, it is assumed that the SPI bus used is not shared
* with other SPI peripherals. The reasons behind this choice are simplicity and
* performance:
* - Reading from the peripheral SPI can be challenging especially if other
* threads access the same SPI bus. Indeed it is common that the function
* spiRead yield nothings even if the chip has signaled data with the irq
* line. Sharing would make the situation worse and increase the risk of
* timeout of HCI commands / response.
* - This driver can be used even if the RTOS is disabled or not present it may
* may be usefull for some targets.
*
* If The SPI is shared with other peripherals then the best option would be to
* handle SPI read in a real time thread woken up by an event flag.
*
* Other mechanisms might also be added in the future to handle data read as an
* event from the stack. This might not be the best solution for all BLE chip;
* especially this one.
*/
class TransportDriver : public cordio::CordioHCITransportDriver {
public:
/**
* Construct the transport driver required by a BlueNRG_MS module.
* @param mosi Pin of the SPI mosi
* @param miso Pin of the SPI miso
* @param sclk Pin of the SPI clock
* @param irq Pin used by the module to signal data are available.
*/
TransportDriver(PinName mosi, PinName miso, PinName sclk, PinName ncs, PinName irq)
: spi(mosi, miso, sclk), nCS(ncs), irq(irq), _spi_thread(osPriorityNormal, SPI_STACK_SIZE, _spi_thread_stack)
{
_spi_thread.start(mbed::callback(this, &TransportDriver::spi_read_cb));
}
virtual ~TransportDriver() { }
/**
* @see CordioHCITransportDriver::initialize
*/
virtual void initialize()
{
// Setup the spi for 8 bit data, low clock polarity,
// 1-edge phase, with an 8MHz clock rate
spi.format(8, 0);
spi.frequency(8000000);
// Deselect the BlueNRG_MS chip by keeping its nCS signal high
nCS = 1;
wait_us(500);
// Set the interrupt handler for the device
irq.mode(PullDown); // set irq mode
irq.rise(mbed::callback(this, &TransportDriver::HCI_Isr));
}
/**
* @see CordioHCITransportDriver::terminate
*/
virtual void terminate() { }
/**
* @see CordioHCITransportDriver::write
*/
virtual uint16_t write(uint8_t type, uint16_t len, uint8_t *pData)
{
// repeat write until successfull. A number of attempt or timeout might
// be useful
while (spiWrite(type, pData, len) == 0) { }
return len;
}
private:
uint16_t spiWrite(uint8_t type, const uint8_t *data, uint16_t data_length)
{
static const uint8_t header_master[] = {
0x0A, 0x00, 0x00, 0x00, 0x00
};
uint8_t header_slave[] = { 0xaa, 0x00, 0x00, 0x00, 0x00 };
uint16_t data_written = 0;
uint16_t write_buffer_size = 0;
_spi_mutex.lock();
/* CS reset */
nCS = 0;
/* Exchange header */
for (uint8_t i = 0; i < sizeof(header_master); ++i) {
header_slave[i] = spi.write(header_master[i]);
}
if (header_slave[0] != 0x02) {
goto exit;
}
write_buffer_size = header_slave[2] << 8 | header_slave[1];
if (write_buffer_size == 0 || write_buffer_size < (data_length + 1)) {
goto exit;
}
spi.write(type);
data_written = data_length;
for (uint16_t i = 0; i < data_length; ++i) {
spi.write(data[i]);
}
exit:
nCS = 1;
_spi_mutex.unlock();
return data_written;
}
uint16_t spiRead(uint8_t *data_buffer, const uint16_t buffer_size)
{
static const uint8_t header_master[] = {0x0b, 0x00, 0x00, 0x00, 0x00};
uint8_t header_slave[5] = { 0xaa, 0x00, 0x00, 0x00, 0x00};
uint16_t read_length = 0;
uint16_t data_available = 0;
nCS = 0;
/* Read the header */
for (size_t i = 0; i < sizeof(header_master); i++) {
header_slave[i] = spi.write(header_master[i]);
}
if (header_slave[0] != 0x02) {
goto exit;
}
data_available = (header_slave[4] << 8) | header_slave[3];
read_length = data_available > buffer_size ? buffer_size : data_available;
for (uint16_t i = 0; i < read_length; ++i) {
data_buffer[i] = spi.write(0xFF);
}
exit:
nCS = 1;
return read_length;
}
/*
* might be split into two parts: the IRQ signaling a real time thread and
* the real time thread reading data from the SPI.
*/
void HCI_Isr(void)
{
_spi_read_sem.release();
}
void spi_read_cb()
{
uint8_t data_buffer[256];
while (true) {
_spi_read_sem.acquire();
_spi_mutex.lock();
while (irq == 1) {
uint16_t data_read = spiRead(data_buffer, sizeof(data_buffer));
on_data_received(data_buffer, data_read);
}
_spi_mutex.unlock();
}
}
/**
* Unsafe SPI, does not lock when SPI access happens.
*/
::mbed::SPI spi;
mbed::DigitalOut nCS;
mbed::InterruptIn irq;
rtos::Thread _spi_thread;
uint8_t _spi_thread_stack[SPI_STACK_SIZE];
rtos::Semaphore _spi_read_sem;
rtos::Mutex _spi_mutex;
};
} // namespace bluenrg_ms
} // namespace vendor
} // namespace ble
/**
* Cordio HCI driver factory
*/
ble::vendor::cordio::CordioHCIDriver &ble_cordio_get_hci_driver()
{
static ble::vendor::bluenrg_ms::TransportDriver transport_driver(
MBED_CONF_BLUENRG_MS_SPI_MOSI,
MBED_CONF_BLUENRG_MS_SPI_MISO,
MBED_CONF_BLUENRG_MS_SPI_SCK,
MBED_CONF_BLUENRG_MS_SPI_NCS,
MBED_CONF_BLUENRG_MS_SPI_IRQ
);
static ble::vendor::bluenrg_ms::HCIDriver hci_driver(
transport_driver,
MBED_CONF_BLUENRG_MS_SPI_RESET
);
return hci_driver;
}
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