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esp32[s2|s3]: Add SPI bitbang support
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| Original file line number | Diff line number | Diff line change |
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| /**************************************************************************** | ||
| * arch/xtensa/src/common/espressif/esp_spi_bitbang.c | ||
| * | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. The | ||
| * ASF licenses this file to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance with the | ||
| * License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations | ||
| * under the License. | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| /**************************************************************************** | ||
| * Included Files | ||
| ****************************************************************************/ | ||
|
|
||
| #include <nuttx/config.h> | ||
|
|
||
| #ifdef CONFIG_ESPRESSIF_SPI_BITBANG | ||
| #include <sys/param.h> | ||
| #include <sys/types.h> | ||
| #include <stdint.h> | ||
| #include <string.h> | ||
| #include <assert.h> | ||
| #include <debug.h> | ||
|
|
||
| #include <nuttx/arch.h> | ||
| #include <nuttx/irq.h> | ||
| #include <nuttx/mutex.h> | ||
| #include <nuttx/kmalloc.h> | ||
| #include <nuttx/spi/spi.h> | ||
| #include <nuttx/spi/spi_bitbang.h> | ||
|
|
||
| #include "esp_spi_bitbang.h" | ||
| #include <nuttx/spi/spi_bitbang.c> | ||
|
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| #if defined(CONFIG_ARCH_CHIP_ESP32S3) | ||
| #include "esp32s3_gpio.h" | ||
| #include "hardware/esp32s3_gpio_sigmap.h" | ||
| #elif defined(CONFIG_ARCH_CHIP_ESP32S2) | ||
| #include "esp32s2_gpio.h" | ||
| #include "esp32s2_gpio_sigmap.h" | ||
| #else | ||
| #include "esp32_gpio.h" | ||
| #include "esp32_gpio_sigmap.h" | ||
| #endif | ||
|
|
||
| /**************************************************************************** | ||
| * Pre-processor Definitions | ||
| ****************************************************************************/ | ||
|
|
||
| #if defined(CONFIG_ARCH_CHIP_ESP32S3) | ||
| #define CONFIG_GPIO(pin, attr) esp32s3_configgpio(pin, attr) | ||
| #define GPIO_MATRIX_OUT(pin, idx, inv, en_inv) esp32s3_gpio_matrix_out(pin, \ | ||
| idx, inv, en_inv) | ||
| #elif defined(CONFIG_ARCH_CHIP_ESP32S2) | ||
| #define CONFIG_GPIO(pin, attr) esp32s2_configgpio(pin, attr) | ||
| #define GPIO_MATRIX_OUT(pin, idx, inv, en_inv) esp32s2_gpio_matrix_out(pin, \ | ||
| idx, inv, en_inv) | ||
| #else | ||
| #define CONFIG_GPIO(pin, attr) esp32_configgpio(pin, attr) | ||
| #define GPIO_MATRIX_OUT(pin, idx, inv, en_inv) esp32_gpio_matrix_out(pin, \ | ||
| idx, inv, en_inv) | ||
| #endif | ||
|
|
||
| #if defined(CONFIG_ESPRESSIF_SPI_BITBANG_MODE0) | ||
| #undef SPI_BITBANG_DISABLEMODE0 | ||
| #define SPI_BITBANG_DISABLEMODE1 1 | ||
| #define SPI_BITBANG_DISABLEMODE2 1 | ||
| #define SPI_BITBANG_DISABLEMODE3 1 | ||
| #elif defined(CONFIG_ESPRESSIF_SPI_BITBANG_MODE1) | ||
| #undef SPI_BITBANG_DISABLEMODE1 | ||
| #define SPI_BITBANG_DISABLEMODE0 1 | ||
| #define SPI_BITBANG_DISABLEMODE2 1 | ||
| #define SPI_BITBANG_DISABLEMODE3 1 | ||
| #elif defined(CONFIG_ESPRESSIF_SPI_BITBANG_MODE2) | ||
| #undef SPI_BITBANG_DISABLEMODE2 | ||
| #define SPI_BITBANG_DISABLEMODE0 1 | ||
| #define SPI_BITBANG_DISABLEMODE1 1 | ||
| #define SPI_BITBANG_DISABLEMODE3 1 | ||
| #else | ||
| #undef SPI_BITBANG_DISABLEMODE3 | ||
| #define SPI_BITBANG_DISABLEMODE0 1 | ||
| #define SPI_BITBANG_DISABLEMODE1 1 | ||
| #define SPI_BITBANG_DISABLEMODE2 1 | ||
| #endif | ||
|
|
||
| /**************************************************************************** | ||
| * Private Function Prototypes | ||
| ****************************************************************************/ | ||
|
|
||
| /* Lower-half SPI */ | ||
|
|
||
| static void spi_select(struct spi_bitbang_s *priv, uint32_t devid, | ||
| bool selected); | ||
| static uint8_t spi_status(struct spi_bitbang_s *priv, uint32_t devid); | ||
| #ifdef CONFIG_SPI_CMDDATA | ||
| static int spi_cmddata(struct spi_bitbang_s *priv, uint32_t devid, | ||
| bool cmd); | ||
| #endif | ||
|
|
||
| /**************************************************************************** | ||
| * Private Data | ||
| ****************************************************************************/ | ||
|
|
||
| struct spi_bitbang_ops_s esp_spi_bitbang_ops = | ||
| { | ||
| .select = spi_select, | ||
| .status = spi_status, | ||
| #ifdef CONFIG_SPI_CMDDATA | ||
| .cmddata = spi_cmddata, | ||
| #endif | ||
| .setfrequency = spi_setfrequency, | ||
| .setmode = spi_setmode, | ||
| .exchange = spi_exchange, | ||
| }; | ||
|
|
||
| /**************************************************************************** | ||
| * Private Functions | ||
| ****************************************************************************/ | ||
|
|
||
| /**************************************************************************** | ||
| * Name: spi_select | ||
| * | ||
| * Description: | ||
| * Select or de-selected the SPI device specified by 'devid' | ||
| * | ||
| * Input Parameters: | ||
| * priv - An instance of the bit-bang driver structure | ||
| * devid - The device to select or de-select | ||
| * selected - True:select false:de-select | ||
| * | ||
| * Returned Value: | ||
| * None | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| static void spi_select(struct spi_bitbang_s *priv, uint32_t devid, | ||
| bool selected) | ||
| { | ||
| if (selected) | ||
| { | ||
| SPI_CLRCS; | ||
| } | ||
| else | ||
| { | ||
| SPI_SETCS; | ||
| } | ||
| } | ||
|
|
||
| /**************************************************************************** | ||
| * Name: spi_status | ||
| * | ||
| * Description: | ||
| * Return status of the SPI device specified by 'devid' | ||
| * | ||
| * Input Parameters: | ||
| * priv - An instance of the bit-bang driver structure | ||
| * devid - The device to select or de-select | ||
| * | ||
| * Returned Value: | ||
| * An 8-bit, bit-encoded status byte | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| static uint8_t spi_status(struct spi_bitbang_s *priv, uint32_t devid) | ||
| { | ||
| if (devid == SPIDEV_MMCSD(0)) | ||
| { | ||
| return SPI_STATUS_PRESENT; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| /**************************************************************************** | ||
| * Name: spi_cmddata | ||
| * | ||
| * Description: | ||
| * If there were was a CMD/DATA line, this function would manage it | ||
| * | ||
| * Input Parameters: | ||
| * priv - An instance of the bit-bang driver structure | ||
| * devid - The device to use | ||
| * cmd - True=MCD false=DATA | ||
| * | ||
| * Returned Value: | ||
| * OK | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| #ifdef CONFIG_SPI_CMDDATA | ||
| static int spi_cmddata(struct spi_bitbang_s *priv, uint32_t devid, | ||
| bool cmd) | ||
| { | ||
| return OK; | ||
| } | ||
| #endif | ||
|
|
||
| /**************************************************************************** | ||
| * Public Functions | ||
| ****************************************************************************/ | ||
|
|
||
| /**************************************************************************** | ||
| * Name: esp_spi_bitbang_init | ||
| * | ||
| * Description: | ||
| * Initialize the SPI bit-bang driver | ||
| * | ||
| * Input Parameters: | ||
| * None | ||
| * | ||
| * Returned Value: | ||
| * A non-NULL reference to the SPI driver on success | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| struct spi_dev_s *esp_spi_bitbang_init(void) | ||
| { | ||
| /* Configure the SPI bit-bang pins */ | ||
|
|
||
| GPIO_WRITE(CONFIG_ESPRESSIF_SPI_BITBANG_CSPIN, true); | ||
| GPIO_WRITE(CONFIG_ESPRESSIF_SPI_BITBANG_MOSIPIN, true); | ||
| GPIO_WRITE(CONFIG_ESPRESSIF_SPI_BITBANG_CLKPIN, true); | ||
|
|
||
| #if CONFIG_ESPRESSIF_SPI_SWCS | ||
| CONFIG_GPIO(CONFIG_ESPRESSIF_SPI_BITBANG_CSPIN, OUTPUT_FUNCTION_1); | ||
| GPIO_MATRIX_OUT(CONFIG_ESPRESSIF_SPI_BITBANG_CSPIN, SIG_GPIO_OUT_IDX, | ||
| 0, 0); | ||
| #endif | ||
| CONFIG_GPIO(CONFIG_ESPRESSIF_SPI_BITBANG_MOSIPIN, OUTPUT_FUNCTION_1); | ||
| GPIO_MATRIX_OUT(CONFIG_ESPRESSIF_SPI_BITBANG_MOSIPIN, SIG_GPIO_OUT_IDX, | ||
| 0, 0); | ||
|
|
||
| CONFIG_GPIO(CONFIG_ESPRESSIF_SPI_BITBANG_MISOPIN, | ||
| INPUT_FUNCTION_1 | PULLUP); | ||
| GPIO_MATRIX_OUT(CONFIG_ESPRESSIF_SPI_BITBANG_MISOPIN, SIG_GPIO_OUT_IDX, | ||
| 0, 0); | ||
|
|
||
| CONFIG_GPIO(CONFIG_ESPRESSIF_SPI_BITBANG_CLKPIN, OUTPUT_FUNCTION_1); | ||
| GPIO_MATRIX_OUT(CONFIG_ESPRESSIF_SPI_BITBANG_CLKPIN, SIG_GPIO_OUT_IDX, | ||
| 0, 0); | ||
|
|
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| /* Create the SPI driver instance */ | ||
|
|
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| return spi_create_bitbang(&esp_spi_bitbang_ops, NULL); | ||
| } | ||
|
|
||
| /**************************************************************************** | ||
| * Name: esp_spi_bitbang_uninitialize | ||
| * | ||
| * Description: | ||
| * Destroy an instance of the SPI bit-bang driver. | ||
| * | ||
| * Input Parameters: | ||
| * dev - device instance, target driver to destroy. | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| void esp_spi_bitbang_uninitialize(struct spi_dev_s *dev) | ||
| { | ||
| spi_destroy_bitbang(dev); | ||
| } | ||
|
|
||
| #endif /* CONFIG_ESPRESSIF_SPI_BITBANG */ |
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