pw_transfer: Support filling a receive buffer

Previously, transfers would fail if the client set pending_bytes to 0,
even if there were no more bytes to send. This made it impossible for
the C++ client to completely fill its receive buffer.

This change permits the receiver to set pending_bytes to 0. The transfer
aborts with an error if there is still data to send, but completes
successfully if there is no more data.

Change-Id: Idf0aa5a785efb60a8332131c49c4ae2a5ff81064
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/70883
Reviewed-by: Alexei Frolov <frolv@google.com>
Commit-Queue: Wyatt Hepler <hepler@google.com>
4 files changed
tree: 74327e63488bff382387d11c2486a6143ee8db5c
  1. build_overrides/
  2. docker/
  3. docs/
  4. pw_allocator/
  5. pw_analog/
  6. pw_android_toolchain/
  7. pw_arduino_build/
  8. pw_assert/
  9. pw_assert_basic/
  10. pw_assert_log/
  11. pw_base64/
  12. pw_bloat/
  13. pw_blob_store/
  14. pw_bluetooth_hci/
  15. pw_boot/
  16. pw_boot_cortex_m/
  17. pw_build/
  18. pw_build_info/
  19. pw_build_mcuxpresso/
  20. pw_bytes/
  21. pw_checksum/
  22. pw_chrono/
  23. pw_chrono_embos/
  24. pw_chrono_freertos/
  25. pw_chrono_stl/
  26. pw_chrono_threadx/
  27. pw_cli/
  28. pw_console/
  29. pw_containers/
  30. pw_cpu_exception/
  31. pw_cpu_exception_cortex_m/
  32. pw_crypto/
  33. pw_docgen/
  34. pw_doctor/
  35. pw_env_setup/
  36. pw_file/
  37. pw_function/
  38. pw_fuzzer/
  39. pw_hdlc/
  40. pw_hex_dump/
  41. pw_i2c/
  42. pw_interrupt/
  43. pw_interrupt_cortex_m/
  44. pw_kvs/
  45. pw_libc/
  46. pw_log/
  47. pw_log_basic/
  48. pw_log_null/
  49. pw_log_rpc/
  50. pw_log_tokenized/
  51. pw_malloc/
  52. pw_malloc_freelist/
  53. pw_metric/
  54. pw_minimal_cpp_stdlib/
  55. pw_module/
  56. pw_multisink/
  57. pw_package/
  58. pw_persistent_ram/
  59. pw_polyfill/
  60. pw_preprocessor/
  61. pw_presubmit/
  62. pw_protobuf/
  63. pw_protobuf_compiler/
  64. pw_random/
  65. pw_result/
  66. pw_ring_buffer/
  67. pw_router/
  68. pw_rpc/
  69. pw_snapshot/
  70. pw_software_update/
  71. pw_span/
  72. pw_status/
  73. pw_stm32cube_build/
  74. pw_stream/
  75. pw_string/
  76. pw_symbolizer/
  77. pw_sync/
  78. pw_sync_baremetal/
  79. pw_sync_embos/
  80. pw_sync_freertos/
  81. pw_sync_stl/
  82. pw_sync_threadx/
  83. pw_sys_io/
  84. pw_sys_io_arduino/
  85. pw_sys_io_baremetal_lm3s6965evb/
  86. pw_sys_io_baremetal_stm32f429/
  87. pw_sys_io_mcuxpresso/
  88. pw_sys_io_stdio/
  89. pw_target_runner/
  90. pw_thread/
  91. pw_thread_embos/
  92. pw_thread_freertos/
  93. pw_thread_stl/
  94. pw_thread_threadx/
  95. pw_tls_client/
  96. pw_tls_client_boringssl/
  97. pw_tls_client_mbedtls/
  98. pw_tokenizer/
  99. pw_tool/
  100. pw_toolchain/
  101. pw_trace/
  102. pw_trace_tokenized/
  103. pw_transfer/
  104. pw_unit_test/
  105. pw_varint/
  106. pw_watch/
  107. pw_web_ui/
  108. pw_work_queue/
  109. targets/
  110. third_party/
  111. .bazelignore
  112. .bazelrc
  113. .clang-format
  114. .clang-tidy
  115. .eslintrc.json
  116. .gitattributes
  117. .gitignore
  118. .gn
  119. .prettierrc.js
  120. .pylintrc
  121. activate.bat
  122. AUTHORS
  123. bootstrap.bat
  124. bootstrap.sh
  125. BUILD.bazel
  126. BUILD.gn
  127. BUILDCONFIG.gn
  128. CMakeLists.txt
  129. LICENSE
  130. modules.gni
  131. OWNERS
  132. package.json
  133. PW_PLUGINS
  134. README.md
  135. tsconfig.json
  136. WORKSPACE
  137. yarn.lock
README.md

Pigweed

Pigweed is an open source collection of embedded-targeted libraries–or as we like to call them, modules. These modules are building blocks and infrastructure that enable faster and more reliable development on small-footprint MMU-less 32-bit microcontrollers like the STMicroelectronics STM32L452 or the Nordic nRF52832.

For more information please see our website: https://pigweed.dev/

Links