How to Receive data with SPI from sensor and output with UART

[Kaito]

Hi!!

I would like to receive data from the sensor via SPI using nrf 52832 DK and output data with UART.

It is now possible to add the function of uart to the spi sample code of SDK 14.0.0 and run it only with uart.

However, it is not possible to receive data from the sensor and output it with uart

I think that it is outputting the contents of an empty array.

How can I receive data from an external sensor via spi and output data with uart?

I mainly send and receive SPI and send uart data with the following code

best regards!!!



void SPITxDummy(unsigned char Data)
{
nrf_gpio_pin_clear(22); //CS pin low
nrf_drv_spi_transfer(&spi, &Data, 1, m_rx_buf, 1);
nrf_delay_us(50);
}

while (1)
{
SPITxDummy(0x00); //Dummy Data
app_uart_put(m_rx_buf[0]);
nrf_delay_ms(200);

}

[Kaito]

Hi!

I do not know how to solve the two problems

1.I checked m_rx_buf to store the value of MISO after sending the dummy signal, but nothing was stored.

Why is not the value from MISO stored in m_rx_buf?

2.Also, in nrf_drv_spi_transfer used for sending and receiving spi data, the type received must be uint8_t *, the type of app_uart_put to be sent in uart must be uint8_t, what should you do if it matches the same type?

I believe that solving this problem will lead to successful transmission and reception of data from external sensors.

thank you in advanced!!!!

 

[Kenneth]

Hi,

I assume you are trying to combine:

\nRF5_SDK_15.2.0_9412b96\examples\peripheral\nrfx_spim
\nRF5_SDK_15.2.0_9412b96\examples\peripheral\uart 

1. If SPIM doesn't work as expected, make sure you have a logic analyzer so you can monitor the SPI lines.

2. You are passing a pointer to the start address in memory of where the data is. To pass the address you may use '&variable'.

Best regards,
Kenneth

[Kaito]

thank you for your reply!

I only commented out the command to change the mode of the ADS 1192!

Now we have received data properly!

However, I would like to obtain hexadecimal data, but ASCII conversion will occur and Japanese katakana will be output.

should I have to use some conversion function to receive output data in hexadecimal number?

best regards!!

[Kaito]

Hi!

When observing output from UART in Tera Term, the output data was garbled.

Is there any way to avoid this garbled character?

best regards!!

[Kenneth]

Kaito said:

should I have to use some conversion function to receive output data in hexadecimal number?

 Maybe this thread can be useful: https://stackoverflow.com/questions/5403103/hex-to-ascii-string-conversion 

I assume the main problem here is related to: http://www.asciitable.com/