From d74c8b9425d38fe2dce56e044b128ab5693f5f06 Mon Sep 17 00:00:00 2001
From: Dan Halbert <halbert@halwitz.org>
Date: Tue, 6 Aug 2019 22:55:25 -0400
Subject: WIP: more Descriptor work; refactor gattc/gatts read/write

---
 ports/nrf/common-hal/bleio/Descriptor.c | 84 ++++++++++++++++++++++++++++++++-
 1 file changed, 82 insertions(+), 2 deletions(-)

(limited to 'ports/nrf/common-hal/bleio/Descriptor.c')

diff --git a/ports/nrf/common-hal/bleio/Descriptor.c b/ports/nrf/common-hal/bleio/Descriptor.c
index ad62b2535..d6473a64f 100644
--- a/ports/nrf/common-hal/bleio/Descriptor.c
+++ b/ports/nrf/common-hal/bleio/Descriptor.c
@@ -26,13 +26,93 @@
  * THE SOFTWARE.
  */
 
-#include "common-hal/bleio/Descriptor.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/bleio/__init__.h"
+#include "shared-bindings/bleio/Descriptor.h"
+#include "shared-bindings/bleio/Service.h"
 #include "shared-bindings/bleio/UUID.h"
 
-void common_hal_bleio_descriptor_construct(bleio_descriptor_obj_t *self, bleio_uuid_obj_t *uuid) {
+static volatile bleio_descriptor_obj_t *m_read_descriptor;
+
+void common_hal_bleio_descriptor_construct(bleio_descriptor_obj_t *self, bleio_uuid_obj_t *uuid, bleio_attribute_security_mode_t read_perm, bleio_attribute_security_mode_t write_perm) {
+    self->characteristic = MP_OBJ_NULL;
     self->uuid = uuid;
+    self->value = mp_const_none;
+    self->handle = BLE_CONN_HANDLE_INVALID;
+    self->read_perm = read_perm;
+    self->write_perm = write_perm;
 }
 
 bleio_uuid_obj_t *common_hal_bleio_descriptor_get_uuid(bleio_descriptor_obj_t *self) {
     return self->uuid;
 }
+
+mp_obj_t common_hal_bleio_descriptor_get_characteristic(bleio_descriptor_obj_t *self) {
+    return self->characteristic;
+}
+
+STATIC void descriptor_on_gattc_read_rsp_evt(ble_evt_t *ble_evt, void *param) {
+    switch (ble_evt->header.evt_id) {
+
+        // More events may be handled later, so keep this as a switch.
+
+        case BLE_GATTC_EVT_READ_RSP: {
+            ble_gattc_evt_read_rsp_t *response = &ble_evt->evt.gattc_evt.params.read_rsp;
+            if (m_read_descriptor) {
+                m_read_descriptor->value = mp_obj_new_bytearray(response->len, response->data);
+            }
+            // Indicate to busy-wait loop that we've read the attribute value.
+            m_read_descriptor = NULL;
+            break;
+        }
+
+        default:
+            // For debugging.
+            // mp_printf(&mp_plat_print, "Unhandled descriptor event: 0x%04x\n", ble_evt->header.evt_id);
+            break;
+    }
+}
+
+STATIC void descriptor_gattc_read(bleio_descriptor_obj_t *descriptor) {
+    const uint16_t conn_handle =
+        common_hal_bleio_device_get_conn_handle(descriptor->characteristic->service->device);
+    common_hal_bleio_check_connected(conn_handle);
+
+    // Set to NULL in event loop after event.
+    m_read_descriptor = descriptor;
+
+    ble_drv_add_event_handler(descriptor_on_gattc_read_rsp_evt, descriptor);
+
+    const uint32_t err_code = sd_ble_gattc_read(conn_handle, descriptor->handle, 0);
+    if (err_code != NRF_SUCCESS) {
+        mp_raise_OSError_msg_varg(translate("Failed to read attribute value, err 0x%04x"), err_code);
+    }
+
+    while (m_read_descriptor != NULL) {
+        MICROPY_VM_HOOK_LOOP;
+    }
+
+    ble_drv_remove_event_handler(descriptor_on_gattc_read_rsp_evt, descriptor);
+}
+
+mp_obj_t common_hal_bleio_descriptor_get_value(bleio_descriptor_obj_t *self) {
+    if (common_hal_bleio_service_get_is_remote(self->characteristic->service)) {
+        descriptor_gattc_read(self);
+    } else {
+        self->value = common_hal_bleio_gatts_read(
+            self->handle, common_hal_bleio_device_get_conn_handle(self->characteristic->service->device));
+    }
+
+    return self->value;
+}
+
+void common_hal_bleio_descriptor_set_value(bleio_descriptor_obj_t *self, mp_buffer_info_t *bufinfo) {
+    uint16_t conn_handle = common_hal_bleio_device_get_conn_handle(self->characteristic->service->device);
+    if (common_hal_bleio_service_get_is_remote(self->characteristic->service)) {
+        // false means WRITE_REQ, not write-no-response
+        common_hal_bleio_gattc_write(self->handle, conn_handle, bufinfo, false);
+    } else {
+        common_hal_bleio_gatts_write(self->handle, conn_handle, bufinfo);
+    }
+}
-- 
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