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essl: new component to communicate with esp serial slave devices

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This commit is contained in:
Michael (XIAO Xufeng)
2019-09-28 18:14:24 +08:00
parent 7c8139734d
commit 087c8f6065
17 changed files with 1409 additions and 18 deletions
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7
docs/en/api-reference/peripherals/esp_slave_protocol.rst
View File

@@ -76,7 +76,10 @@ ESP SDIO slave protocol
-----------------------
The protocol is based on Function 1 access by CMD52 and CMD53, offering 3 services: (1) sending and receiving FIFO, (2) 52 8-bit R/W
register shared by host and slave, (3) 8 general purpose interrupt sources from host to slave and 8 in the oppsite direction.
register shared by host and slave, (3) 8 general purpose interrupt sources from host to slave and 8 in the opposite direction.
There is a component `esp_serial_slave_link` implementing the logic of this protocol for
ESP32 master to communicate with the ESP32 slave. See :doc:`/api-reference/protocols/esp_serial_slave_link`.
The host should access the registers below as described to communicate with slave.
@@ -154,7 +157,7 @@ To write the receiving FIFO in the slave, host should work in the following step
1. Read the TOKEN1 field (bits 27-16) of TOKEN_RDATA (0x044) register. The buffer number remaining is TOKEN1 minus
the number of buffers used by host.
2. Make sure the buffer number is sufficient (*buffer_size* * *buffer_num* is greater than data to write, *buffer_size*
2. Make sure the buffer number is sufficient (*recv_buffer_size* * *buffer_num* is greater than data to write, *recv_buffer_size*
is pre-defined between the host and the slave before the communication starts). Or go back to step 1 until the buffer
is enough.
3. Write to the FIFO address with CMD53. Note that the *requested length* should not be larger than calculated in step 2,

8
docs/en/api-reference/peripherals/sdio_slave.rst
View File

@@ -127,9 +127,11 @@ SDIO initialization process (Sector 3.1.2 of `SDIO Simplified
Specification <https://www.sdcard.org/downloads/pls/>`_), which is described
briefly in :ref:`esp_slave_init`.
Furthermore, there's an ESP32-specific upper-level communication protocol upon
the CMD52/CMD53 to Func 1. Please refer to :ref:`esp_slave_protocol_layer`,
or example :example:`peripherals/sdio` when programming your host.
Furthermore, there's an ESP32-specific upper-level communication protocol upon the CMD52/CMD53 to
Func 1. Please refer to :ref:`esp_slave_protocol_layer`. There is also a component
:doc:`ESP Serial Slave Link </api-reference/protocols/esp_serial_slave_link>`
for ESP32 master to communicate with ESP32 SDIO slave, see example :example:`peripherals/sdio`
when programming your host.
.. toctree::
:hidden: