I am losing characters during transmit and receive. I want to try increasing the buffer size for tx and rx.
Using 2 psoc4 SCBs configured as UARTs. One goes to the PC as a log the other goes to a SIM 7600A GSM modem. I am losing characters transmitting to the GSM modem. I think it might be the buffer size is too small.
I would like to increase the tx and rx buffers. I’m using SCB UART, with interrupt “RXFIFO not empty”. I started with an external interrupt with buffer size 8 for both rx and tx. It works for short commands to the modem.
Issues:
- Increasing the tx buffer size required me to use an internal interrupt. OK, I changed the external to internal, and it seems to work. But I still have problems
- Increasing the rx buffer size requires the option of rx fifo not empty. But I cannot get it to work.
2 UARTS
- UART_CMD (to the PC)
- Uses default buffer sizes tx 8 and rx 8
- Uses external interrupt
- UART_GSM (to the GSM modem)
- Trying to increase the buffer size for both rx and tx
- Uses internal interrupt that was required by increasing the Tx buffer size
I am allowing PSOC creator to configure the pins.
I am using a cy8ckit-042
Initialization:
ISR_CMD_ClearPending() ;
ISR_CMD_StartEx(ISR_CMD_Handler) ;
UART_GSM_SetCustomInterruptHandler(*ISR_GSM_Handler);
UART_GSM_ClearRxInterruptSource(UART_GSM_INTR_RX_NOT_EMPTY) ;
UART_CMD_Start() ;
UART_GSM_Start() ;
CyGlobalIntEnable; /* Enable global interrupts. */
Simple rx interrupt routine.
if (UART_CMD_SpiUartGetRxBufferSize()) { // changed if to while
cmd_buf[cmd_write_index] = UART_CMD_UartGetByte() ;
cmd_write_index = (cmd_write_index + 1) % RX_BUF_LEN ;
}
UART_CMD_ClearRxInterruptSource(UART_CMD_INTR_RX_NOT_EMPTY) ;
Is it possible to receive more than one character during an interrupt cycle? If so, I could change the if to while.
What else could I be doing wrong?
