How to read characters (string) in PSoC from Serial

Use an Rx interrupt, or poll, and fill an array byte by byte as they

are received. You would use a pointer into the array and inc it each

time you write a byte. There are example projects in Creator, on start

page "Find Example Projects" link.

Regards, Dana.

Are you trying to use the UART bridge that connects the USB interface to a (virtual) Com-port on your PC? Then you need to use the SCB - based component and connect Tx and Rx to Port4_0 and _1

When using a direct connection from your Tx and Rx pins P0_5 and _4 you will need a level shifter to convert the 5V signal to a +-12v RS232 level and back.

Bob

Maybe I misunderstood you, you are talking about " just wiring P0.4 and P0.5 to the Serial Bridge" which pins do you use?.

Did you confirm that the baud-rate for USB-chip is same as for your UART? Did you check using Cypress USB Configuration Utility?

Bob

Your variable "send" is defined too short, so sprintf() will overwrire data.

Declaring a local variable as "volatile" is of no use, it cannot get changed from the outside, but your variable "i" can.

Bob

´Concerning the "wiring": Sorry I was darn wrong with that. For the CY8CKIT-049-42xx prototyping kit P4_0 and P4_1 are correct.

No external wire needed, both pins are already connected to the USB-bridge. Just built and tested a project - attached.

Bob

I have a project that use "commands" to turn on the corresponding led on the RGB Led of the Pioneer Kit, i haven´t seen yours, but maybe it can help you, find it attached.

PD: en ese proyecto estaba tratando de entender las funciones de string.h asi que trae varias cosas que ni al caso xD

You are overdoing too much.

First the UART send:

Do not use delay functions, do not use UART_ClearTxBuffer() except in case of an error.

Instead use UART_ReadTxStatus() and check for completed transfer- Since UART_PutString is a blocking function not even that is needed.

Next the UART receive:

You do not need to use an interrupt, you may increase the Rx buffer in the UART component and look wit UART_GetRxBufferSize() for data received. Only difficulty is here to find out when a transmission is finished. Easiest is when a delimiter as \r or \n is received.

When using the interrupt the first thing in the handler is to clear the interrupt source using UART_ReadRxStatus().

Look into the UART's datasheet for explanations of the functions and the status registers.

What if you receive more than 5 bytes? Then you are destroying data!!!

You may, but you do not need to write your own conversion routines. There is the scanf() library routine which will do, have a look here.

Happy coding

Bob