[英]How to send float data over BLE and display it properly on the UART (nRF Toolbox)
I'm sending a command over BLE from the central (Android) to the nRF52832, and receive SPI data back, but in wrong format. 我正在通过BLE从中央(Android)向nRF52832发送命令,并以错误的格式接收回SPI数据。 How can I convert/display this data as it is. 我如何直接转换/显示这些数据。
I expect to receive [1.2 2.2 3.2]
when I send '1'
to the nRF52832. 当我向nRF52832发送'1'
时,我希望收到[1.2 2.2 3.2]
。 All I get till now is hex data [FF?@]
. 到目前为止,我所得到的只是十六进制数据[FF?@]
。
if (p_evt->params.rx_data.p_data[0] == '1') // If the Rx_Central input is '1', ble_nus_data_send the accelerometer data.
{
spim_rx_buffer.AccX = 1.2; // Random dummy data
spim_rx_buffer.AccY = 2.2; // Random dummy data
spim_rx_buffer.AccZ = 3.2; // Random dummy data
for(int i = 0; i < 3; i++)
{
uint16_t len = sizeof(float);
float* spi_p = (float*) &spim_rx_buffer;
err_code = ble_nus_data_send (&m_nus, (uint8_t*)spi_p+i*sizeof(float), &len, m_conn_handle);
}
}
Reading the documentation of ble_nus_data_send helps: 阅读ble_nus_data_send的文档有助于:
Function for sending a data to the peer.
This function sends the input string as an RX characteristic notification to the peer.
Parameters
[in] p_nus Pointer to the Nordic UART Service structure.
[in] p_data String to be sent.
[in,out] p_length Pointer Length of the string. Amount of sent bytes.
[in] conn_handle Connection Handle of the destination client.
What you do is to cast a float pointer to uint8, thus, you 您要做的是将浮点指针投射到uint8,因此,您
You could use sprintf to convert your float to a valid string. 您可以使用sprintf将float转换为有效字符串。
Or you try to violate the API (ugly) and convert your float raw data to uint8, meaning that one float results in probably 4 bytes. 或者,您尝试违反API(很丑陋)并将您的float原始数据转换为uint8,这意味着一个float可能会导致4个字节。 Now hope that the underlying code does not interpret something as string, for example 0 terminator or so. 现在希望底层代码不会将某些内容解释为字符串,例如0终止符左右。
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