686 lines
20 KiB
C++
686 lines
20 KiB
C++
#include "bluefruit_le.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <alloca.h>
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#include "debug.h"
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#include "timer.h"
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#include "gpio.h"
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#include "ringbuffer.hpp"
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#include <string.h>
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#include "spi_master.h"
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#include "wait.h"
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#include "analog.h"
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#include "progmem.h"
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// These are the pin assignments for the 32u4 boards.
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// You may define them to something else in your config.h
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// if yours is wired up differently.
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#ifndef BLUEFRUIT_LE_RST_PIN
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# define BLUEFRUIT_LE_RST_PIN D4
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#endif
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#ifndef BLUEFRUIT_LE_CS_PIN
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# define BLUEFRUIT_LE_CS_PIN B4
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#endif
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#ifndef BLUEFRUIT_LE_IRQ_PIN
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# define BLUEFRUIT_LE_IRQ_PIN E6
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#endif
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#ifndef BLUEFRUIT_LE_SCK_DIVISOR
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# define BLUEFRUIT_LE_SCK_DIVISOR 2 // 4MHz SCK/8MHz CPU, calculated for Feather 32U4 BLE
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#endif
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#define SAMPLE_BATTERY
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#define ConnectionUpdateInterval 1000 /* milliseconds */
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#ifndef BATTERY_LEVEL_PIN
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# define BATTERY_LEVEL_PIN B5
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#endif
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static struct {
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bool is_connected;
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bool initialized;
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bool configured;
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#define ProbedEvents 1
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#define UsingEvents 2
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bool event_flags;
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#ifdef SAMPLE_BATTERY
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uint16_t last_battery_update;
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uint32_t vbat;
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#endif
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uint16_t last_connection_update;
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} state;
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// Commands are encoded using SDEP and sent via SPI
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// https://github.com/adafruit/Adafruit_BluefruitLE_nRF51/blob/master/SDEP.md
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#define SdepMaxPayload 16
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struct sdep_msg {
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uint8_t type;
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uint8_t cmd_low;
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uint8_t cmd_high;
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struct __attribute__((packed)) {
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uint8_t len : 7;
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uint8_t more : 1;
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};
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uint8_t payload[SdepMaxPayload];
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} __attribute__((packed));
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// The recv latency is relatively high, so when we're hammering keys quickly,
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// we want to avoid waiting for the responses in the matrix loop. We maintain
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// a short queue for that. Since there is quite a lot of space overhead for
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// the AT command representation wrapped up in SDEP, we queue the minimal
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// information here.
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enum queue_type {
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QTKeyReport, // 1-byte modifier + 6-byte key report
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QTConsumer, // 16-bit key code
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QTMouseMove, // 4-byte mouse report
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};
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struct queue_item {
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enum queue_type queue_type;
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uint16_t added;
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union __attribute__((packed)) {
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struct __attribute__((packed)) {
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uint8_t modifier;
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uint8_t keys[6];
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} key;
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uint16_t consumer;
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struct __attribute__((packed)) {
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int8_t x, y, scroll, pan;
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uint8_t buttons;
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} mousemove;
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};
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};
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// Items that we wish to send
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static RingBuffer<queue_item, 40> send_buf;
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// Pending response; while pending, we can't send any more requests.
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// This records the time at which we sent the command for which we
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// are expecting a response.
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static RingBuffer<uint16_t, 2> resp_buf;
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static bool process_queue_item(struct queue_item *item, uint16_t timeout);
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enum sdep_type {
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SdepCommand = 0x10,
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SdepResponse = 0x20,
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SdepAlert = 0x40,
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SdepError = 0x80,
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SdepSlaveNotReady = 0xFE, // Try again later
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SdepSlaveOverflow = 0xFF, // You read more data than is available
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};
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enum ble_cmd {
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BleInitialize = 0xBEEF,
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BleAtWrapper = 0x0A00,
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BleUartTx = 0x0A01,
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BleUartRx = 0x0A02,
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};
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enum ble_system_event_bits {
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BleSystemConnected = 0,
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BleSystemDisconnected = 1,
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BleSystemUartRx = 8,
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BleSystemMidiRx = 10,
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};
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#define SdepTimeout 150 /* milliseconds */
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#define SdepShortTimeout 10 /* milliseconds */
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#define SdepBackOff 25 /* microseconds */
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#define BatteryUpdateInterval 10000 /* milliseconds */
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static bool at_command(const char *cmd, char *resp, uint16_t resplen, bool verbose, uint16_t timeout = SdepTimeout);
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static bool at_command_P(const char *cmd, char *resp, uint16_t resplen, bool verbose = false);
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// Send a single SDEP packet
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static bool sdep_send_pkt(const struct sdep_msg *msg, uint16_t timeout) {
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spi_start(BLUEFRUIT_LE_CS_PIN, false, 0, BLUEFRUIT_LE_SCK_DIVISOR);
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uint16_t timerStart = timer_read();
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bool success = false;
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bool ready = false;
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do {
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ready = spi_write(msg->type) != SdepSlaveNotReady;
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if (ready) {
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break;
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}
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// Release it and let it initialize
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spi_stop();
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wait_us(SdepBackOff);
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spi_start(BLUEFRUIT_LE_CS_PIN, false, 0, BLUEFRUIT_LE_SCK_DIVISOR);
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} while (timer_elapsed(timerStart) < timeout);
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if (ready) {
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// Slave is ready; send the rest of the packet
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spi_transmit(&msg->cmd_low, sizeof(*msg) - (1 + sizeof(msg->payload)) + msg->len);
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success = true;
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}
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spi_stop();
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return success;
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}
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static inline void sdep_build_pkt(struct sdep_msg *msg, uint16_t command, const uint8_t *payload, uint8_t len, bool moredata) {
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msg->type = SdepCommand;
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msg->cmd_low = command & 0xFF;
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msg->cmd_high = command >> 8;
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msg->len = len;
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msg->more = (moredata && len == SdepMaxPayload) ? 1 : 0;
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static_assert(sizeof(*msg) == 20, "msg is correctly packed");
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memcpy(msg->payload, payload, len);
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}
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// Read a single SDEP packet
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static bool sdep_recv_pkt(struct sdep_msg *msg, uint16_t timeout) {
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bool success = false;
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uint16_t timerStart = timer_read();
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bool ready = false;
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do {
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ready = readPin(BLUEFRUIT_LE_IRQ_PIN);
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if (ready) {
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break;
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}
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wait_us(1);
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} while (timer_elapsed(timerStart) < timeout);
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if (ready) {
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spi_start(BLUEFRUIT_LE_CS_PIN, false, 0, BLUEFRUIT_LE_SCK_DIVISOR);
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do {
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// Read the command type, waiting for the data to be ready
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msg->type = spi_read();
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if (msg->type == SdepSlaveNotReady || msg->type == SdepSlaveOverflow) {
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// Release it and let it initialize
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spi_stop();
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wait_us(SdepBackOff);
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spi_start(BLUEFRUIT_LE_CS_PIN, false, 0, BLUEFRUIT_LE_SCK_DIVISOR);
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continue;
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}
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// Read the rest of the header
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spi_receive(&msg->cmd_low, sizeof(*msg) - (1 + sizeof(msg->payload)));
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// and get the payload if there is any
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if (msg->len <= SdepMaxPayload) {
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spi_receive(msg->payload, msg->len);
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}
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success = true;
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break;
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} while (timer_elapsed(timerStart) < timeout);
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spi_stop();
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}
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return success;
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}
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static void resp_buf_read_one(bool greedy) {
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uint16_t last_send;
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if (!resp_buf.peek(last_send)) {
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return;
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}
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if (readPin(BLUEFRUIT_LE_IRQ_PIN)) {
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struct sdep_msg msg;
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again:
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if (sdep_recv_pkt(&msg, SdepTimeout)) {
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if (!msg.more) {
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// We got it; consume this entry
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resp_buf.get(last_send);
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dprintf("recv latency %dms\n", TIMER_DIFF_16(timer_read(), last_send));
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}
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if (greedy && resp_buf.peek(last_send) && readPin(BLUEFRUIT_LE_IRQ_PIN)) {
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goto again;
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}
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}
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} else if (timer_elapsed(last_send) > SdepTimeout * 2) {
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dprintf("waiting_for_result: timeout, resp_buf size %d\n", (int)resp_buf.size());
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// Timed out: consume this entry
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resp_buf.get(last_send);
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}
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}
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static void send_buf_send_one(uint16_t timeout = SdepTimeout) {
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struct queue_item item;
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// Don't send anything more until we get an ACK
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if (!resp_buf.empty()) {
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return;
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}
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if (!send_buf.peek(item)) {
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return;
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}
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if (process_queue_item(&item, timeout)) {
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// commit that peek
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send_buf.get(item);
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dprintf("send_buf_send_one: have %d remaining\n", (int)send_buf.size());
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} else {
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dprint("failed to send, will retry\n");
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wait_ms(SdepTimeout);
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resp_buf_read_one(true);
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}
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}
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static void resp_buf_wait(const char *cmd) {
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bool didPrint = false;
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while (!resp_buf.empty()) {
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if (!didPrint) {
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dprintf("wait on buf for %s\n", cmd);
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didPrint = true;
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}
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resp_buf_read_one(true);
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}
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}
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void bluefruit_le_init(void) {
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state.initialized = false;
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state.configured = false;
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state.is_connected = false;
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setPinInput(BLUEFRUIT_LE_IRQ_PIN);
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spi_init();
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// Perform a hardware reset
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setPinOutput(BLUEFRUIT_LE_RST_PIN);
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writePinHigh(BLUEFRUIT_LE_RST_PIN);
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writePinLow(BLUEFRUIT_LE_RST_PIN);
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wait_ms(10);
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writePinHigh(BLUEFRUIT_LE_RST_PIN);
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wait_ms(1000); // Give it a second to initialize
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state.initialized = true;
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}
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static inline uint8_t min(uint8_t a, uint8_t b) {
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return a < b ? a : b;
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}
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static bool read_response(char *resp, uint16_t resplen, bool verbose) {
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char *dest = resp;
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char *end = dest + resplen;
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while (true) {
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struct sdep_msg msg;
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if (!sdep_recv_pkt(&msg, 2 * SdepTimeout)) {
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dprint("sdep_recv_pkt failed\n");
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return false;
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}
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if (msg.type != SdepResponse) {
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*resp = 0;
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return false;
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}
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uint8_t len = min(msg.len, end - dest);
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if (len > 0) {
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memcpy(dest, msg.payload, len);
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dest += len;
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}
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if (!msg.more) {
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// No more data is expected!
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break;
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}
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}
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// Ensure the response is NUL terminated
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*dest = 0;
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// "Parse" the result text; we want to snip off the trailing OK or ERROR line
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// Rewind past the possible trailing CRLF so that we can strip it
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--dest;
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while (dest > resp && (dest[0] == '\n' || dest[0] == '\r')) {
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*dest = 0;
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--dest;
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}
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// Look back for start of preceeding line
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char *last_line = strrchr(resp, '\n');
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if (last_line) {
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++last_line;
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} else {
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last_line = resp;
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}
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bool success = false;
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static const char kOK[] PROGMEM = "OK";
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success = !strcmp_P(last_line, kOK);
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if (verbose || !success) {
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dprintf("result: %s\n", resp);
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}
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return success;
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}
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static bool at_command(const char *cmd, char *resp, uint16_t resplen, bool verbose, uint16_t timeout) {
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const char * end = cmd + strlen(cmd);
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struct sdep_msg msg;
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if (verbose) {
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dprintf("ble send: %s\n", cmd);
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}
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if (resp) {
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// They want to decode the response, so we need to flush and wait
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// for all pending I/O to finish before we start this one, so
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// that we don't confuse the results
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resp_buf_wait(cmd);
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*resp = 0;
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}
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// Fragment the command into a series of SDEP packets
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while (end - cmd > SdepMaxPayload) {
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sdep_build_pkt(&msg, BleAtWrapper, (uint8_t *)cmd, SdepMaxPayload, true);
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if (!sdep_send_pkt(&msg, timeout)) {
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return false;
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}
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cmd += SdepMaxPayload;
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}
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sdep_build_pkt(&msg, BleAtWrapper, (uint8_t *)cmd, end - cmd, false);
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if (!sdep_send_pkt(&msg, timeout)) {
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return false;
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}
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if (resp == NULL) {
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uint16_t now = timer_read();
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while (!resp_buf.enqueue(now)) {
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resp_buf_read_one(false);
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}
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uint16_t later = timer_read();
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if (TIMER_DIFF_16(later, now) > 0) {
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dprintf("waited %dms for resp_buf\n", TIMER_DIFF_16(later, now));
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}
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return true;
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}
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return read_response(resp, resplen, verbose);
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}
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bool at_command_P(const char *cmd, char *resp, uint16_t resplen, bool verbose) {
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char *cmdbuf = (char *)alloca(strlen_P(cmd) + 1);
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strcpy_P(cmdbuf, cmd);
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return at_command(cmdbuf, resp, resplen, verbose);
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}
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bool bluefruit_le_is_connected(void) {
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return state.is_connected;
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}
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bool bluefruit_le_enable_keyboard(void) {
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char resbuf[128];
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if (!state.initialized) {
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return false;
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}
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state.configured = false;
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// Disable command echo
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static const char kEcho[] PROGMEM = "ATE=0";
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// Make the advertised name match the keyboard
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static const char kGapDevName[] PROGMEM = "AT+GAPDEVNAME=" PRODUCT;
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// Turn on keyboard support
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static const char kHidEnOn[] PROGMEM = "AT+BLEHIDEN=1";
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// Adjust intervals to improve latency. This causes the "central"
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// system (computer/tablet) to poll us every 10-30 ms. We can't
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// set a smaller value than 10ms, and 30ms seems to be the natural
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// processing time on my macbook. Keeping it constrained to that
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// feels reasonable to type to.
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static const char kGapIntervals[] PROGMEM = "AT+GAPINTERVALS=10,30,,";
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// Reset the device so that it picks up the above changes
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static const char kATZ[] PROGMEM = "ATZ";
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// Turn down the power level a bit
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static const char kPower[] PROGMEM = "AT+BLEPOWERLEVEL=-12";
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static PGM_P const configure_commands[] PROGMEM = {
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kEcho, kGapIntervals, kGapDevName, kHidEnOn, kPower, kATZ,
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};
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uint8_t i;
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for (i = 0; i < sizeof(configure_commands) / sizeof(configure_commands[0]); ++i) {
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PGM_P cmd;
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memcpy_P(&cmd, configure_commands + i, sizeof(cmd));
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if (!at_command_P(cmd, resbuf, sizeof(resbuf))) {
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dprintf("failed BLE command: %S: %s\n", cmd, resbuf);
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goto fail;
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}
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}
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state.configured = true;
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// Check connection status in a little while; allow the ATZ time
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// to kick in.
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state.last_connection_update = timer_read();
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fail:
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return state.configured;
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}
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static void set_connected(bool connected) {
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if (connected != state.is_connected) {
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if (connected) {
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dprint("BLE connected\n");
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} else {
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dprint("BLE disconnected\n");
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}
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state.is_connected = connected;
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// TODO: if modifiers are down on the USB interface and
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// we cut over to BLE or vice versa, they will remain stuck.
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// This feels like a good point to do something like clearing
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// the keyboard and/or generating a fake all keys up message.
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// However, I've noticed that it takes a couple of seconds
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// for macOS to to start recognizing key presses after BLE
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// is in the connected state, so I worry that doing that
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// here may not be good enough.
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}
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}
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void bluefruit_le_task(void) {
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char resbuf[48];
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if (!state.configured && !bluefruit_le_enable_keyboard()) {
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return;
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}
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resp_buf_read_one(true);
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send_buf_send_one(SdepShortTimeout);
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if (resp_buf.empty() && (state.event_flags & UsingEvents) && readPin(BLUEFRUIT_LE_IRQ_PIN)) {
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// Must be an event update
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if (at_command_P(PSTR("AT+EVENTSTATUS"), resbuf, sizeof(resbuf))) {
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uint32_t mask = strtoul(resbuf, NULL, 16);
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if (mask & BleSystemConnected) {
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set_connected(true);
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} else if (mask & BleSystemDisconnected) {
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set_connected(false);
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}
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}
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}
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if (timer_elapsed(state.last_connection_update) > ConnectionUpdateInterval) {
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bool shouldPoll = true;
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if (!(state.event_flags & ProbedEvents)) {
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// Request notifications about connection status changes.
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// This only works in SPIFRIEND firmware > 0.6.7, which is why
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// we check for this conditionally here.
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|
// Note that at the time of writing, HID reports only work correctly
|
|
// with Apple products on firmware version 0.6.7!
|
|
// https://forums.adafruit.com/viewtopic.php?f=8&t=104052
|
|
if (at_command_P(PSTR("AT+EVENTENABLE=0x1"), resbuf, sizeof(resbuf))) {
|
|
at_command_P(PSTR("AT+EVENTENABLE=0x2"), resbuf, sizeof(resbuf));
|
|
state.event_flags |= UsingEvents;
|
|
}
|
|
state.event_flags |= ProbedEvents;
|
|
|
|
// leave shouldPoll == true so that we check at least once
|
|
// before relying solely on events
|
|
} else {
|
|
shouldPoll = false;
|
|
}
|
|
|
|
static const char kGetConn[] PROGMEM = "AT+GAPGETCONN";
|
|
state.last_connection_update = timer_read();
|
|
|
|
if (at_command_P(kGetConn, resbuf, sizeof(resbuf))) {
|
|
set_connected(atoi(resbuf));
|
|
}
|
|
}
|
|
|
|
#ifdef SAMPLE_BATTERY
|
|
if (timer_elapsed(state.last_battery_update) > BatteryUpdateInterval && resp_buf.empty()) {
|
|
state.last_battery_update = timer_read();
|
|
|
|
state.vbat = analogReadPin(BATTERY_LEVEL_PIN);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static bool process_queue_item(struct queue_item *item, uint16_t timeout) {
|
|
char cmdbuf[48];
|
|
char fmtbuf[64];
|
|
|
|
// Arrange to re-check connection after keys have settled
|
|
state.last_connection_update = timer_read();
|
|
|
|
#if 1
|
|
if (TIMER_DIFF_16(state.last_connection_update, item->added) > 0) {
|
|
dprintf("send latency %dms\n", TIMER_DIFF_16(state.last_connection_update, item->added));
|
|
}
|
|
#endif
|
|
|
|
switch (item->queue_type) {
|
|
case QTKeyReport:
|
|
strcpy_P(fmtbuf, PSTR("AT+BLEKEYBOARDCODE=%02x-00-%02x-%02x-%02x-%02x-%02x-%02x"));
|
|
snprintf(cmdbuf, sizeof(cmdbuf), fmtbuf, item->key.modifier, item->key.keys[0], item->key.keys[1], item->key.keys[2], item->key.keys[3], item->key.keys[4], item->key.keys[5]);
|
|
return at_command(cmdbuf, NULL, 0, true, timeout);
|
|
|
|
#ifdef EXTRAKEY_ENABLE
|
|
case QTConsumer:
|
|
strcpy_P(fmtbuf, PSTR("AT+BLEHIDCONTROLKEY=0x%04x"));
|
|
snprintf(cmdbuf, sizeof(cmdbuf), fmtbuf, item->consumer);
|
|
return at_command(cmdbuf, NULL, 0, true, timeout);
|
|
#endif
|
|
|
|
#ifdef MOUSE_ENABLE
|
|
case QTMouseMove:
|
|
strcpy_P(fmtbuf, PSTR("AT+BLEHIDMOUSEMOVE=%d,%d,%d,%d"));
|
|
snprintf(cmdbuf, sizeof(cmdbuf), fmtbuf, item->mousemove.x, item->mousemove.y, item->mousemove.scroll, item->mousemove.pan);
|
|
if (!at_command(cmdbuf, NULL, 0, true, timeout)) {
|
|
return false;
|
|
}
|
|
strcpy_P(cmdbuf, PSTR("AT+BLEHIDMOUSEBUTTON="));
|
|
if (item->mousemove.buttons & MOUSE_BTN1) {
|
|
strcat(cmdbuf, "L");
|
|
}
|
|
if (item->mousemove.buttons & MOUSE_BTN2) {
|
|
strcat(cmdbuf, "R");
|
|
}
|
|
if (item->mousemove.buttons & MOUSE_BTN3) {
|
|
strcat(cmdbuf, "M");
|
|
}
|
|
if (item->mousemove.buttons == 0) {
|
|
strcat(cmdbuf, "0");
|
|
}
|
|
return at_command(cmdbuf, NULL, 0, true, timeout);
|
|
#endif
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
void bluefruit_le_send_keyboard(report_keyboard_t *report) {
|
|
struct queue_item item;
|
|
|
|
item.queue_type = QTKeyReport;
|
|
item.key.modifier = report->mods;
|
|
item.key.keys[0] = report->keys[0];
|
|
item.key.keys[1] = report->keys[1];
|
|
item.key.keys[2] = report->keys[2];
|
|
item.key.keys[3] = report->keys[3];
|
|
item.key.keys[4] = report->keys[4];
|
|
item.key.keys[5] = report->keys[5];
|
|
|
|
while (!send_buf.enqueue(item)) {
|
|
send_buf_send_one();
|
|
}
|
|
}
|
|
|
|
void bluefruit_le_send_consumer(uint16_t usage) {
|
|
struct queue_item item;
|
|
|
|
item.queue_type = QTConsumer;
|
|
item.consumer = usage;
|
|
|
|
while (!send_buf.enqueue(item)) {
|
|
send_buf_send_one();
|
|
}
|
|
}
|
|
|
|
void bluefruit_le_send_mouse(report_mouse_t *report) {
|
|
struct queue_item item;
|
|
|
|
item.queue_type = QTMouseMove;
|
|
item.mousemove.x = report->x;
|
|
item.mousemove.y = report->y;
|
|
item.mousemove.scroll = report->v;
|
|
item.mousemove.pan = report->h;
|
|
item.mousemove.buttons = report->buttons;
|
|
|
|
while (!send_buf.enqueue(item)) {
|
|
send_buf_send_one();
|
|
}
|
|
}
|
|
|
|
uint32_t bluefruit_le_read_battery_voltage(void) {
|
|
return state.vbat;
|
|
}
|
|
|
|
bool bluefruit_le_set_mode_leds(bool on) {
|
|
if (!state.configured) {
|
|
return false;
|
|
}
|
|
|
|
// The "mode" led is the red blinky one
|
|
at_command_P(on ? PSTR("AT+HWMODELED=1") : PSTR("AT+HWMODELED=0"), NULL, 0);
|
|
|
|
// Pin 19 is the blue "connected" LED; turn that off too.
|
|
// When turning LEDs back on, don't turn that LED on if we're
|
|
// not connected, as that would be confusing.
|
|
at_command_P(on && state.is_connected ? PSTR("AT+HWGPIO=19,1") : PSTR("AT+HWGPIO=19,0"), NULL, 0);
|
|
return true;
|
|
}
|
|
|
|
// https://learn.adafruit.com/adafruit-feather-32u4-bluefruit-le/ble-generic#at-plus-blepowerlevel
|
|
bool bluefruit_le_set_power_level(int8_t level) {
|
|
char cmd[46];
|
|
if (!state.configured) {
|
|
return false;
|
|
}
|
|
snprintf(cmd, sizeof(cmd), "AT+BLEPOWERLEVEL=%d", level);
|
|
return at_command(cmd, NULL, 0, false);
|
|
}
|