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extmod/modbluetooth: Re-instate optional no-ringbuf modbluetooth.

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This requires that the event handlers are called from non-interrupt context
(i.e. the MicroPython scheduler).

This will allow the BLE stack (e.g. NimBLE) to run from the scheduler
rather than an IRQ like PENDSV, and therefore be able to invoke Python
callbacks directly/synchronously.  This allows writing Python BLE handlers
for events that require immediate response such as _IRQ_READ_REQUEST (which
was previous a hard IRQ) and future events relating to pairing/bonding.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
This commit is contained in:
Jim Mussared
2020-10-28 13:06:45 +11:00
committed by Damien George
parent 6d9fdff8d0
commit 81e92d3d6e
6 changed files with 189 additions and 54 deletions
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8
extmod/modbluetooth.h
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@@ -43,8 +43,10 @@
#define MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE (0)
#endif
#ifndef MICROPY_PY_BLUETOOTH_GATTS_ON_READ_CALLBACK
#define MICROPY_PY_BLUETOOTH_GATTS_ON_READ_CALLBACK (0)
#ifndef MICROPY_PY_BLUETOOTH_USE_SYNC_EVENTS
// This can be enabled if the BLE stack runs entirely in scheduler context
// and therefore is able to call directly into the VM to run Python callbacks.
#define MICROPY_PY_BLUETOOTH_USE_SYNC_EVENTS (0)
#endif
// This is used to protect the ringbuffer.
@@ -261,10 +263,8 @@ void mp_bluetooth_gatts_on_write(uint16_t conn_handle, uint16_t value_handle);
// Call this when an acknowledgment is received for an indication.
void mp_bluetooth_gatts_on_indicate_complete(uint16_t conn_handle, uint16_t value_handle, uint8_t status);
#if MICROPY_PY_BLUETOOTH_GATTS_ON_READ_CALLBACK
// Call this when a characteristic is read from. Return false to deny the read.
bool mp_bluetooth_gatts_on_read_request(uint16_t conn_handle, uint16_t value_handle);
#endif
// Call this when an MTU exchange completes.
void mp_bluetooth_gatts_on_mtu_exchanged(uint16_t conn_handle, uint16_t value);