[问答]

如何成功使用nfc阅读器cr95hf

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问答对人有帮助，内容完整，我也想知道答案 0 几天后我尝试使用NFC阅读器cr95hf（MIKROE-143）。作为mcu我使用评估板nRF52832。不幸的是，到目前为止我没有成功。 MIKROE-143的数据表可在此处找到： https://www.mouser.ch/datasheet/ ... k_manual-255532.pdf 我使用SPI作为通信接口（我将SSI_0设置为高电平，将SSI_1设置为低电平）。根据他们的数据表，CR95HF SPI分三步：发送命令 2.使用0x03轮询，直到SPI将第3位返回到1 3.发送命令0x02进行读取控制字节用于指定通信类型和方向： 0x00：向CR95HF0x03发送命令：轮询CR95HF0x02：从CR95HF0x01读取数据：复位CR95HFT SPI_SS线用于选择公共SPI总线上的器件。 SPI_SS引脚为低电平有效。我的SPI配置如下所示：本数据表中包含以下步骤： http://www.solutions-cubed.com/c ... DATASHEET_BM019.pdf 第1步，发送命令：第2步，轮询数据就绪：第3步，读取数据：变量：在第1步之后：在第2步之后：在第3步之后：这个奇怪的响应来自哪里（0x0E 0x00 0x00 0x00 0x00 0x00 0x00 0x00 .... 0x00 0x00 0x00 0x00）？为什么我经常得到0x0E？我保持了启动程序。我用示波器检查了这个。标签当然不是空的（用我的智能手机检查）。以上来自于谷歌翻译以下为原文 i try to use the nfc reader cr95hf (MIKROE-143) since a few days. as mcu i use the evaluation board nRF52832. unfortunately i don't succeed so far. The data sheet for the MIKROE-143 can be found here: https://www.mouser.ch/datasheet/ ... k_manual-255532.pdf I use SPI as communication interface (I set SSI_0 high and SSI_1 low.). According to their datasheet, the CR95HF SPI works in 3 steps: 1. send command 2. poll with 0x03 until SPI return bit 3 to 1 3. send command 0x02 to read A Control byte is used to specify a communication type and direction: 0x00: Send command to the CR95HF 0x03: Poll the CR95HF 0x02: Read data from the CR95HF 0x01: Reset the CR95HF The SPI_SS line is used to select a device on the common SPI bus. The SPI_SS pin is active low. My SPI configuration looks like this: nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG; spi_config.ss_pin = NRF_SPI_PIN_NOT_CONNECTED; spi_config.miso_pin = SPI_MISO_PIN; spi_config.mosi_pin = SPI_MOSI_PIN; spi_config.sck_pin = SPI_SCK_PIN; spi_config.mode = NRF_DRV_SPI_MODE_0; spi_config.frequency = NRF_DRV_SPI_FREQ_1M; spi_config.bit_order = NRF_DRV_SPI_BIT_ORDER_MSB_FIRST; APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL)); The following steps are taken from this data sheet: http://www.solutions-cubed.com/c ... DATASHEET_BM019.pdf step 1, send the command: nrf_gpio_pin_clear(SPI_SS_PIN); spi_xfer_done = false; APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, invcommand, 5, NULL, 0)); while (!spi_xfer_done){__WFE();} nrf_gpio_pin_set(SPI_SS_PIN); nrf_delay_ms(1); step 2, poll for data ready: nrf_gpio_pin_clear(SPI_SS_PIN); while(m_rx_buf[0] != 8) { spi_xfer_done = false; m_tx_buf[0] = 0x03; APP_ERROR_CHECK(nrf_drv_spi_transfer(&m_spi_master_0, m_tx_buf, 1, m_rx_buf, 1)); while (!spi_xfer_done) { __WFE(); } m_rx_buf[0] = m_rx_buf[0] & 0x08; } nrf_gpio_pin_set(SPI_SS_PIN); nrf_delay_ms(1); step 3, read the data: nrf_gpio_pin_clear(SPI_SS_PIN); spi_xfer_done = false; APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, &readcommand, 1, read_buff, sizeof(read_buff))); while (!spi_xfer_done){__WFE();} nrf_gpio_pin_set(SPI_SS_PIN); nrf_delay_ms(1); variable: uint8_t sendrecv[6] = {0x04, 0x03, 0x26, 0x01, 0x00}; uint8_t invcommand[5] = {0x00, 0x02, 0x02, 0x01,0x21}; uint8_t pollcommand = 0x03; uint8_t readcommand = 0x02; uint8_t control_command = 0x00; after step 1: after step 2: after step 3: where does this strange response come from (0x0E 0x00 0x00 0x00 0x00 0x00 0x00 0x00.... 0x00 0x00 0x00 0x00)? why do i get 0x0E so often? i kept the startup routine. i checked this with an oscilloscope. The tag is certainly not empty (checked with my smartphone). 0
2019-7-22 07:17:17　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × wang21cj 该类别下有 44 个回答。邀请回答新星之火12138 该类别下有 41 个回答。邀请回答 chm5 该类别下有 39 个回答。邀请回答 hgimtk 该类别下有 33 个回答。邀请回答 HengDu 该类别下有 30 个回答。邀请回答 hwp0415229 该类别下有 28 个回答。邀请回答 jghgfdssas 该类别下有 28 个回答。邀请回答可口可甜该类别下有 26 个回答。邀请回答 kingnet6688 该类别下有 26 个回答。邀请回答颜刚YanG 该类别下有 26 个回答。邀请回答 zyh34997 该类别下有 25 个回答。邀请回答柱子图宁该类别下有 25 个回答。邀请回答 jenny042 该类别下有 25 个回答。邀请回答 kingnet9999 该类别下有 25 个回答。邀请回答 andyfly7 该类别下有 25 个回答。邀请回答麻酱该类别下有 25 个回答。邀请回答成长的小师弟该类别下有 24 个回答。邀请回答 gXDhn 该类别下有 24 个回答。邀请回答 jiangwenwen 该类别下有 24 个回答。邀请回答哼小曲该类别下有 24 个回答。邀请回答举报陈苏文相关推荐 • 怎样使用CR95HF I2C收发器开发NFC阅读器呢 259 • 请问我是否可以连接两个CR95HF？ 1564 • CR95HF具有哪些特性参数应用？ 1746 • 如何使用CR95HF模拟NDEF？ 284 • CR95HF怎么读取多个寄存器 898 • 是否可以使用单独的PCB设计CR95HF的NFC天线 2217 • CR95HF不响应任何命令 1279 • cr95hf成功读取数据后，是否可以通过空中发送rf命令到st25dv04k？ 234 • 如何改善CR95HF整体范围？ 1565 • 如何解决帮助CR95HF设计的原理图捕获的部分问题？ 801 1个回答

答案对人有帮助，有参考价值 0 你好，我相信你的设置是正确的 SPI接口工作正常，问题来自您发送的命令（uint8_t invcommand [5] = {0x00,0x02,0x02,0x01,0x21};），这不是CR95HF的已知命令假设您使用的是ISO 15693，首先需要使用协议选择命令启动协议，我建议修改如下：uint8_t invcommand [4] = {0x02,0x02,0x01,0x21}; 根据规范https://www.st.com/resource/en/datasheet/cr95hf.pdf见表20/21 SPI应答0x0E表示忙标志仅在第3位有效时关闭。我还建议使用数据表中描述的echo命令检查SPI接口。重置任何协议后，此命令将起作用。问候 PB 以上来自于谷歌翻译以下为原文 Hello, I beleive you setup is correct The SPI interface is working properly the issue come from the command you send ( uint8_t invcommand[5] = {0x00, 0x02, 0x02, 0x01,0x21};) which is not a known command for the CR95HF Assuming you are in ISO 15693 you need first to initiate your protocol using the protocol select command I suggest to modify as follow : uint8_t invcommand[4] = { 0x02, 0x02, 0x01,0x21}; according to the specification https://www.st.com/resource/en/datasheet/cr95hf.pdf see sheet 20/21 The SPI answer 0x0E means that the busy flag is off only the bit 3 is significant. I can also suggest to check your SPI interface using the echo command described in the datasheet. This command will work after reset whatever is the protocol. Regards PB

2019-7-22 07:28:40 评论举报柴扉