UART skipping characters?

RE: UART skipping characters?

isurki — Mon, 21 Sep 2020 14:29:10 GMT

Hi Heidi,

I managed to read all 32 bytes using as reference "test_uart_fifo.c" example provided under /zephyr/tests/drivers/uart/uart_basic_api/src/

Regards,

Ander.

RE: UART skipping characters?

Heidi — Mon, 21 Sep 2020 08:54:43 GMT

Okay, thank you for trying.

I'm pretty sure it's reading out the data faster than it is sent. So try reading out the information byte for byte instead of 1024 at once, and then storing that in a buffer to read out after?

As long as data_length comes back non-zero:

-Read out one byte
-Store in buffer[count]
-Count++

Then read out buffer after.

RE: UART skipping characters?

isurki — Thu, 17 Sep 2020 08:31:27 GMT

Hi;

I have tried your suggestion and I am reading "BM?z??" from UART. Letter "B" is 42 interpreted as ASCII, "M" is 4d... but some characters are left.

According to the datasheet, and proven on the Raspberry, I should read 32 bytes of data.

Thanks for your answer.

Regards.

RE: UART skipping characters?

Heidi — Wed, 16 Sep 2020 10:23:16 GMT

It looks like you might be blocking yourself, re this line:

printf("PMS5003 hexadecimal data: %02X\n", (unsigned char) uart_buf[0]);

Perhaps try this line instead for printing the received information:

printk("%s", uart_buf);

RE: UART skipping characters?

isurki — Wed, 16 Sep 2020 09:43:55 GMT

yes:

CONFIG_SERIAL=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_MAIN_STACK_SIZE=8192
CONFIG_HEAP_MEM_POOL_SIZE=4096

RE: UART skipping characters?

Heidi — Wed, 16 Sep 2020 08:43:36 GMT

Okay. Could you please attach your prj.conf file?

RE: UART skipping characters?

isurki — Wed, 16 Sep 2020 08:03:50 GMT

Hi Heidi,

I have tried with 1024, 2048, 4096 buff size and I am getting the same results.

Thanks for your answer!

Regards.

RE: UART skipping characters?

Heidi — Tue, 15 Sep 2020 12:29:06 GMT

Hi! Sorry about the wait.

Have you tried increasing the buffer size (uart_buf)?

Best regards,

Heidi

RE: UART skipping characters?

isurki — Tue, 15 Sep 2020 07:05:18 GMT

Can someone help me, please? Still waiting...

Thanks.