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IRQ Not Firing

le Ben S.

Hello,

I am writing an I2C master transmitter object. The problem I am having is that the IRQ Handler for I2C1 is not firing. According to the manual, it should fire after the start condition is sent and the status register is 0x08. When I step through the code with the debugger, the status code is 0x08. I am using an MCB1700 development board. Why is it not firing? Did I not configure something properly? For tests, All I am doing is toggling an LED on when the interrupt fires. Once I solve this problem, I will write the rest of the code.

#include <stdio.h>
#include <LPC17XX.h>
#include "GPIO1Output.h"

GPIO1Output out(P1_28);

__irq void I2C1_IRQHandler(void)
{
        if (LPC_I2C1->I2STAT == 0x08)
        {
             out.Set();
        }
}

int main(void)
{
        // Initialize I2C.
        LPC_PINCON->PINSEL0 = 0x0F;
        LPC_PINCON->PINMODE_OD0 = 0x03;

        NVIC_EnableIRQ(I2C1_IRQn);
        LPC_I2C1->I2CONSET = 0x40;

        LPC_I2C1->I2CONSET = 0x20;
        int status = LPC_I2C1->I2STAT;
}

Parents
  • 0 in reply to ImPer Westermark

    If I Recall/Remember Correctly,
    For Cortex-M3, or I should say NXP LPC17xx,
    There are two kind of Keil examples,
    1. Older, not CMSIS style; it has two important source files; startup_LPC17xx.s, system_LPC17xx.c
    2. Newer, CMSIS style; it has three important source files; startup_LPC17xx.s, system_LPC17xx.c, core_cm3.c
    Newer Keil MDK provides the CMSIS style source, startup_LPC17xx.s, system_LPC17xx.c, core_cm3.c.
    If you mix-up the [not CMSIS style source] with [CMSIS style source], you will have some problems to fix.

Reply
  • 0 in reply to ImPer Westermark

    If I Recall/Remember Correctly,
    For Cortex-M3, or I should say NXP LPC17xx,
    There are two kind of Keil examples,
    1. Older, not CMSIS style; it has two important source files; startup_LPC17xx.s, system_LPC17xx.c
    2. Newer, CMSIS style; it has three important source files; startup_LPC17xx.s, system_LPC17xx.c, core_cm3.c
    Newer Keil MDK provides the CMSIS style source, startup_LPC17xx.s, system_LPC17xx.c, core_cm3.c.
    If you mix-up the [not CMSIS style source] with [CMSIS style source], you will have some problems to fix.

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