This is for a PSoC6 running on a CY8CKIT-062-BLE board.
I'm trying to implement an ISR that's called when the UART receives a character so I can get chars from the UART non-blocking, build a command in an input buffer, and then set a flag that that command needs processing when the CR char is received. I found the example CE219656 UART Low Level User ISR which is pretty much what I need except it runs on the M4 and I want it to run on the M0+.
I tried to move the code over to the M0+ (see below) but it chokes on UART_SCB_IRQ_cfg which is an undeclared identifier error.
Is there something different about how this is supposed to work on the M0+
Ted
/* ========================================
*
* Copyright YOUR COMPANY, THE YEAR
* All Rights Reserved
* UNPUBLISHED, LICENSED SOFTWARE.
*
* CONFIDENTIAL AND PROPRIETARY INFORMATION
* WHICH IS THE PROPERTY OF your company.
*
* ========================================
*/
#include "project.h"
#include <stdio.h>
/*******************************************************************************
* Function Prototypes
*******************************************************************************/
void handle_error(void);
void ISR_UART(void);
/*******************************************************************************
* Constants
*******************************************************************************/
#define LED_ON (0x00u)
#define LED_OFF (!LED_ON)
/*******************************************************************************
* Global variables
*******************************************************************************/
uint32_t read_data;
uint32_t data_received;
uint8_t uart_error;
/***************************************************************************//**
* Function Name: handle_error
********************************************************************************
*
* Summary:
* This function processes unrecoverable errors such as any component
* initialization errors etc. In case of such error the system will switch on
* RED_LED_ERROR and stay in the infinite loop of this function.
*
* Parameters:
* None
*
* Return:
* None
*
*******************************************************************************/
void handle_error(void)
{
/* Disable all interrupts */
__disable_irq();
/* Switch on error LED */
Cy_GPIO_Write(RED_LED_ERROR_0_PORT, RED_LED_ERROR_0_NUM, LED_ON);
while(1u) {}
}
/***************************************************************************//**
* Function Name: ISR_UART
********************************************************************************
*
* Summary:
* This function is registered to be called when UART interrupt occurs.
* (Note that only RX fifo not empty interrupt is unmasked)
* Whenever there is a data in UART RX fifo, Get that data and Put it into
* UART TX fifo which will be transmitted to terminal
*
* Parameters:
* None
*
* Return:
* None
*
* Side Effects:
* None
*
*******************************************************************************/
void ISR_UART(void)
{
/* Check for "RX fifo not empty interrupt" */
if((UART1_HW->INTR_RX_MASKED & SCB_INTR_RX_MASKED_NOT_EMPTY_Msk ) != 0)
{
/* Clear UART "RX fifo not empty interrupt" */
UART1_HW->INTR_RX = UART1_HW->INTR_RX & SCB_INTR_RX_NOT_EMPTY_Msk;
/* Get the character from terminal */
read_data = Cy_SCB_UART_Get(UART1_HW);
/* Update data_received flag */
data_received = 1;
}
else
{
/* Error if any other interrupt occurs */
uart_error = 1;
}
}
int main(void)
{
__enable_irq(); /* Enable global interrupts. */
/* Enable CM4. CY_CORTEX_M4_APPL_ADDR must be updated if CM4 memory layout is changed. */
Cy_SysEnableCM4(CY_CORTEX_M4_APPL_ADDR);
/* Place your initialization/startup code here (e.g. MyInst_Start()) */
// UART1_Start();
setvbuf (stdin, NULL, _IONBF, 0);
cy_en_scb_uart_status_t init_status;
/* Start UART operation. */
init_status = Cy_SCB_UART_Init(UART1_HW, &UART1_config, &UART1_context);
if(init_status!=CY_SCB_UART_SUCCESS)
{
handle_error();
}
Cy_SCB_UART_Enable(UART1_HW);
char c;
printf("Started UART\r\n");
/* Unmasking only the RX fifo not empty interrupt bit */
UART1_HW->INTR_RX_MASK = SCB_INTR_RX_MASK_NOT_EMPTY_Msk;
/* Interrupt Settings for UART */
Cy_SysInt_Init(&UART_SCB_IRQ_cfg, ISR_UART);
/* Enable the interrupt */
NVIC_EnableIRQ(UART_SCB_IRQ_cfg.intrSrc);
/* Initialize flags */
data_received = 0;
uart_error = 0;
/* Enable global interrupts. */
__enable_irq();
for(;;)
{
/* Handle received data from terminal */
if(data_received == 1)
{
data_received = 0;
/* Echo the character to terminal */
while (0UL == Cy_SCB_UART_Put(UART1_HW,read_data))
{
}
}
/* Handle UART error */
if(uart_error == 1)
{
handle_error();
}
}
}
/* [] END OF FILE */
