extmod/modbluetooth: Remove limit on data coming from gattc data input.

This removes the limit on data coming in from a BLE.gattc_read() request,
or a notify with payload (coming in to a central).  In both cases the data
coming in to the BLE callback is now limited only by the available data in
the ringbuf, whereas before it was capped at (default hard coded) 20 bytes.

1 files changed, 11 insertions, 1 deletions

diff --git a/extmod/modbluetooth.h b/extmod/modbluetooth.h
index bce28a6d1..8a3ab414f 100644
--- a/extmod/modbluetooth.h
+++ b/extmod/modbluetooth.h
@@ -47,6 +47,12 @@
 #define MICROPY_PY_BLUETOOTH_GATTS_ON_READ_CALLBACK (0)
 #endif
 
+// This is used to protect the ringbuffer.
+#ifndef MICROPY_PY_BLUETOOTH_ENTER
+#define MICROPY_PY_BLUETOOTH_ENTER mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
+#define MICROPY_PY_BLUETOOTH_EXIT MICROPY_END_ATOMIC_SECTION(atomic_state);
+#endif
+
 // Common constants.
 #ifndef MP_BLUETOOTH_MAX_ATTR_SIZE
 #define MP_BLUETOOTH_MAX_ATTR_SIZE (20)
@@ -247,7 +253,11 @@ void mp_bluetooth_gattc_on_characteristic_result(uint16_t conn_handle, uint16_t
 void mp_bluetooth_gattc_on_descriptor_result(uint16_t conn_handle, uint16_t handle, mp_obj_bluetooth_uuid_t *descriptor_uuid);
 
 // Notify modbluetooth that a read has completed with data (or notify/indicate data available, use `event` to disambiguate).
-void mp_bluetooth_gattc_on_data_available(uint16_t event, uint16_t conn_handle, uint16_t value_handle, const uint8_t *data, size_t data_len);
+// Note: these functions are to be called in a group protected by MICROPY_PY_BLUETOOTH_ENTER/EXIT.
+// _start returns the number of bytes to submit to the calls to _chunk, followed by a call to _end.
+size_t mp_bluetooth_gattc_on_data_available_start(uint16_t event, uint16_t conn_handle, uint16_t value_handle, size_t data_len);
+void mp_bluetooth_gattc_on_data_available_chunk(const uint8_t *data, size_t data_len);
+void mp_bluetooth_gattc_on_data_available_end(void);
 
 // Notify modbluetooth that a write has completed.
 void mp_bluetooth_gattc_on_write_status(uint16_t conn_handle, uint16_t value_handle, uint16_t status);