xtensa/esp/rmt: Add the lower-half implementation of the RMT driver
The lower-half implementation of the RMT character driver based on Espressif HAL enables using the RMT peripheral of ESP32, ESP32-S2 and ESP32-S3 as a common xtensa-based Espressif driver. The RMT packages on Espressif SoCs are 4-byte long and are known as "items". Please check the Techinal Reference Manual of the chip to obtain more details.
This commit is contained in:
Tiago Medicci Serrano
Xiang Xiao
parent
d1326e81bc
commit
69929d4084
2
Kconfig
2
Kconfig
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@ -1729,7 +1729,7 @@ endif # DEBUG_REGMAP
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config DEBUG_RMT
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bool "RMT Debug Features"
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default n
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depends on ESP32_RMT
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depends on RMT
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---help---
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Enable RMT debug features.
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@ -129,6 +129,7 @@ endif
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VPATH += chip
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VPATH += common
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VPATH += common/espressif
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VPATH += $(ARCH_SUBDIR)
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VPATH += $(CHIP_DIR)
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@ -0,0 +1,7 @@
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config ESP_RMT
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bool "Remote Control Module (RMT)"
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default n
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depends on RMT
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---help---
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Remote Control Module is currently used to control WS2812
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RGB LED normally used on LED strips.
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@ -0,0 +1,26 @@
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############################################################################
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# arch/xtensa/src/common/espressif/Make.defs
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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ifeq ($(CONFIG_ESP_RMT),y)
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CHIP_CSRCS += esp_rmt.c
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ifeq ($(CONFIG_WS2812_NON_SPI_DRIVER),y)
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CHIP_CSRCS += esp_ws2812.c
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endif
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endif
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,109 @@
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/****************************************************************************
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* arch/xtensa/src/common/espressif/esp_rmt.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __ARCH_XTENSA_SRC_COMMON_ESPRESSIF_ESP_RMT_H
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#define __ARCH_XTENSA_SRC_COMMON_ESPRESSIF_ESP_RMT_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <semaphore.h>
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#include <nuttx/spinlock.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define RMT_MEM_ITEM_NUM SOC_RMT_MEM_WORDS_PER_CHANNEL
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#define RMT_DEFAULT_CLK_DIV 1
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/* Channel can work during APB clock scaling */
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#define RMT_CHANNEL_FLAGS_AWARE_DFS (1 << 0)
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/* Invert RMT signal */
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#define RMT_CHANNEL_FLAGS_INVERT_SIG (1 << 1)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/****************************************************************************
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* Public Functions Prototypes
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****************************************************************************/
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#if defined(CONFIG_ESP_RMT)
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/****************************************************************************
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* Name: esp_rmt_tx_init
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*
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* Description:
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* Initialize the selected RMT device in TX mode
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*
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* Input Parameters:
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* ch - the RMT's channel that will be used
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* pin - The pin used for the TX channel
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*
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* Returned Value:
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* Valid RMT device structure reference on success; NULL, otherwise.
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*
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****************************************************************************/
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struct rmt_dev_s *esp_rmt_tx_init(int ch, int pin);
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/****************************************************************************
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* Name: esp_rmt_rx_init
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*
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* Description:
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* Initialize the selected RMT device in RC mode
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*
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* Input Parameters:
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* ch - the RMT's channel that will be used
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* pin - The pin used for the RX channel
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*
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* Returned Value:
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* Valid RMT device structure reference on success; NULL, otherwise.
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*
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****************************************************************************/
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struct rmt_dev_s *esp_rmt_rx_init(int ch, int pin);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_XTENSA_SRC_COMMON_ESPRESSIF_ESP_RMT_H */
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@ -33,4 +33,15 @@ config RMT_DEFAULT_RX_BUFFER_SIZE
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The RMT RX default buffer size. This is the expected buffer size
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that should be returned on a `read()` operation.
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config RMT_LOOP_TEST_MODE
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bool "RMT character driver loopback test mode (for testing only)"
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depends on EXPERIMENTAL
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default n
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---help---
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This enables a lower-half driver-specific loopback test
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mode that attaches the transmitter to the receiver, being
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able to test the RMT peripheral without any external
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connection. This feature depends on lower-half driver
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implementation.
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endif # RMT
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