1.User space

estsdrivershwinfoapisrcmain.c  hwinfo: add driver support for NXP i.mx RT device ID Add driver support for NXP i.mx RT ID device.
This device has an ID of 8 bytes.
  #include //函数接口定义 #include #include #include /* * @addtogroup t_hwinfo_get_device_id_api * @{ * @defgroup t_hwinfo_get_device_id test_hwinfo_get_device_id * @brief TestPurpose: verify device id get works * @details * - Test Steps * -# Read the ID * -# Check if to many bytes are written to the buffer * -# Check if UID is plausible * - Expected Results * -# Device uid with correct length should be written to the buffer. * @} */ #define BUFFER_LENGTH 17 #define BUFFER_CANARY 0xFF /* * Function invokes the get_entropy callback in driver * to get the random data and fill to passed buffer */ static void test_device_id_get(void) { u8_t buffer_1[BUFFER_LENGTH]; u8_t buffer_2[BUFFER_LENGTH]; ssize_t length_read_1, length_read_2; int i; length_read_1 = hwinfo_get_device_id(buffer_1, 1); //第1次测试 zassert_not_equal(length_read_1, -ENOTSUP, "Not supported by hardware"); zassert_false((length_read_1 < 0), "Error returned: %d", length_read_1); zassert_not_equal(length_read_1, 0, "Zero bytes read"); zassert_equal(length_read_1, 1, "Length not adhered"); memset(buffer_1, BUFFER_CANARY, sizeof(buffer_1)); length_read_1 = hwinfo_get_device_id(buffer_1, BUFFER_LENGTH - 1); zassert_equal(buffer_1[length_read_1], BUFFER_CANARY, "Too many bytes are written"); memcpy(buffer_2, buffer_1, length_read_1); for (i = 0; i < BUFFER_LENGTH; i++) { buffer_1[i] ^= 0xA5; } length_read_2 = hwinfo_get_device_id(buffer_1, BUFFER_LENGTH - 1); //第2次函数 zassert_equal(length_read_1, length_read_2, "Length varied"); //比较多次读是否出错 zassert_equal(buffer_1[length_read_1], (BUFFER_CANARY ^ 0xA5), "Too many bytes are written"); //比较2次Buffer 读取是否出错 for (i = 0; i < length_read_1; i++) { zassert_equal(buffer_1[i], buffer_2[i], "Two consecutively readings don't match"); } }

1.1 头文件

/** * @brief Copy the device id to a buffer * * This routine copies "length" number of bytes of the device ID to the buffer. * If the device ID is smaller then length, the rest of the buffer is left unchanged. * The ID depends on the hardware and is not guaranteed unique. * * @param buffer Buffer to write the ID to. * @param length Max length of the buffer. * * @retval size of the device ID copied or negative on error. */ __syscall ssize_t hwinfo_get_device_id(u8_t *buffer, size_t length); ssize_t z_impl_hwinfo_get_device_id(u8_t *buffer, size_t length); //内涵函数定义

 2.0 驱动实现

2.1 CMAKE

zephyr_sources_ifdef(CONFIG_USERSPACE hwinfo_handlers.c) zephyr_sources_ifdef(CONFIG_HWINFO hwinfo_weak_impl.c) zephyr_sources_ifdef(CONFIG_HWINFO_STM32 hwinfo_stm32.c) zephyr_sources_ifdef(CONFIG_HWINFO_NRF hwinfo_nrf.c) zephyr_sources_ifdef(CONFIG_HWINFO_MCUX_SIM hwinfo_mcux_sim.c) zephyr_sources_ifdef(CONFIG_HWINFO_IMXRT hwinfo_imxrt.c) zephyr_sources_ifdef(CONFIG_HWINFO_SAM hwinfo_sam.c) zephyr_sources_ifdef(CONFIG_HWINFO_SHELL hwinfo_shell.c)

2.2 Kconfig

menuconfig HWINFO bool "Hardware Information driver" help Enable hwinfo driver. if HWINFO config HWINFO_SHELL bool "Enable HWINFO Shell" depends on SHELL help Enable hwinfo Shell for testing. config HWINFO_STM32 bool "STM32 hwinfo" default y depends on SOC_FAMILY_STM32 select USE_STM32_LL_UTILS help Enable STM32 hwinfo driver. config HWINFO_IMXRT bool "NXP i.mx RT device ID" default y depends on SOC_SERIES_IMX_RT help Enable NXP i.mx RT hwinfo driver. config HWINFO_SAM bool "Atmel SAM device ID" default y depends on SOC_FAMILY_SAM help Enable Atmel SAM hwinfo driver. endif

2.3 源文件

* * Copyright (c) 2019 Alexander Wachter * * SPDX-License-Identifier: Apache-2.0 */ #include #include #include struct imxrt_uid { u32_t id[2]; }; ssize_t z_impl_hwinfo_get_device_id(u8_t *buffer, size_t length) { struct imxrt_uid dev_id; dev_id.id[0] = OCOTP->CFG1; dev_id.id[1] = OCOTP->CFG2; if (length > sizeof(dev_id.id)) { length = sizeof(dev_id.id); } memcpy(buffer, dev_id.id, length); return length; } 3. 功能使用 1.打开menuconfig 

2. 定义功能宏 CONFIG_HWINFO_IMXRT=y
CONFIG_HWINFO=y 3.显示效果如下