Hello.
I tried the functions you showed and could not get a failed result.
I used the SCB UART with all default settings. The FIFO is only 8 bytes, so I only sent 8 bytes, including the 0. It passed.
I used the SCB UART with all default settings except I changed the FIFO to 16 bytes. I only sent the 9 bytes you listed and it passed.
Questions:
1) did you change anything in the SCB UART configuration?
2) are you using interrupts or polling?
3) does s/w wait long enough for all the bytes to be received?
4) does s/w wait to read a block of received bytes, or read bytes as soon as each is received?
I checked the source code for the functions UART_SpiUartGetRxBufferSize() and UART_SpiUartReadRxData(). These do not filter any data so all received bytes are available to read.
There were only 2 ways I could make this fail.
a) by not waiting long enough for the 0 byte to be received (reading data as a block)
b) used 8 byte FIFO (default) and placed 0 as the 9th byte (reading data as a block)
BTW, there are some very good UART utilities written by Moto.
https://community.cypress.com/t5/Code-Examples/MCU-Tester-a-Swiss-Army-Knife-for-PSoC-CY8CKIT-059-ve...
Here's the code I ran. I connected TX to RX for a loopback. My UART component is named UART_1. I set the UART buffer size TX/RX to 16. I use a single LED to indicate status.
#include <project.h>
int main()
{
UART_1_Start(); /* Start UART operation */
CyGlobalIntEnable;
#define ArraySize 9
uint8 SendDataArray [] ={16,2,91,87,8,4,0,16,3};
uint8 CompareDataArray []={16,2,91,87,8,4,0,16,3};
/* 16-2-91-87-8-4-0-16-3 */
/* transmit the data bytes */
uint8 j;
for (j=0;j<=ArraySize-1;j=j+1){
UART_1_SpiUartWriteTxData(SendDataArray[j]);
}
CyDelay(100); /* wait for transmission to complete */
/* check number of received bytes by blinking the LED */
uint32 temp = UART_1_SpiUartGetRxBufferSize();
uint8 i;
for (i=0;i<=temp-1;i=i+1){
LED_1_Write(1u); /* LED ON */
CyDelay(500);
LED_1_Write(0u); /* LED OFF */
CyDelay(500);
} /* end for */
CyDelay(2000); /* simple delay to know where we are */
/* check received bytes against compare data array */
for (j=0;j<=temp-1;j=j+1){
if (UART_1_SpiUartReadRxData() == CompareDataArray[j]){
LED_1_Write(1u); /* LED ON */
CyDelay(500);
LED_1_Write(0u); /* LED OFF */
CyDelay(500);
} /* end if */
else {
for(;;) /* stop here if data mismatch */
{}
} /* end else */
} /* end for */
/* do nothing after testing completed */
for(;;)
{
}
} /* end main */
