Hi.
I'm trying getting to run an interrupt on falling edge from GPIO using the OMAP-L137 EVM and PSP drivers 1.20.
I use the GPIO2[13] (on ASFX0). I get a successfully created GPIO handle, but the interrupt is never triggered.
I've checked the input signal on the scope, it's like follows: it's periodic and 3.3V (though quite noisy, noise between 2.9V and 3.6V) during ~16 ms and then goes to 0V for about 0.1 ms. I hope GPIO can handle this kind of signal?
So, and that's what I do on the DSP side:
- I use SPI1and USB as additionnal peripherals (SPI for input, USB for output), I hope this is not any problem?
- the important part in the .tcf is:
bios.HWI.instance("HWI_INT7").interruptSelectNumber = 0;
bios.HWI.instance("HWI_INT8").interruptSelectNumber = 1;
bios.HWI.instance("HWI_INT9").interruptSelectNumber = 2;
bios.HWI.instance("HWI_INT10").interruptSelectNumber = 3;
bios.HWI.instance("HWI_INT11").interruptSelectNumber = 11;
bios.HWI.instance("HWI_INT12").interruptSelectNumber = 12;
(this is from the USB HID keyboard example, but I've seen that it covers the same interrupt select numbers like in the GPIO examples)
- further, in my main task (not the main function), I have the following:
// setup PINMUX + power
Setup_System_Config();
Setup_Psc_All_On();
Psc_ModuleClkCtrl(Psc_DevId_1, GPIO_LPSC_NUM, TRUE);
Setup_System_Config() sets the PINMUX:
#define PINMUX0_VALUE 0x11112188
#define PINMUX1_VALUE 0x11111111
#define PINMUX2_VALUE 0x11111111
#define PINMUX3_VALUE 0x11111111
#define PINMUX4_VALUE 0x11111111
#define PINMUX5_VALUE 0x11111111
#define PINMUX6_VALUE 0x11111111
#define PINMUX7_VALUE 0x11111111
#define PINMUX8_VALUE 0x10022111
#define PINMUX9_VALUE 0x00080001
#define PINMUX10_VALUE 0x00000000
#define PINMUX11_VALUE 0x00000000
#define PINMUX12_VALUE 0x00000000
#define PINMUX13_VALUE 0x00000000
#define PINMUX14_VALUE 0x00000000
#define PINMUX15_VALUE 0x00000000
#define PINMUX16_VALUE 0x00000000
#define PINMUX17_VALUE 0x00000000
#define PINMUX18_VALUE 0x00000000
#define PINMUX19_VALUE 0x00000000
- Setup_Psc_All_On is a copy from http://processors.wiki.ti.com/index.php/Flashing_the_C6747_EVM
- GPIO_LPSC_NUM = 3
- GPIO initialization and configuration follows Psc_ModuleClkCtrl like follows:
gpioParams = Gpio_PARAMS;
// update the gpio parameters to our needs
gpioParams.instNum = 0;
gpioParams.BankParams[2].inUse = Gpio_InUse_No;
gpioParams.BankParams[2].hwiNum = 8;
// It is to be noted here that the pin numbers in GPIO peripheral user guide
// starts from 1 and end at N. However the GPIO params uses arrays to maintain
// the pin and bank configuration info. Hence, respective position for this
// pin in the array will be (pinNumber-1).
gpioParams.BankParams[2].PinConfInfo[13].inUse = Gpio_InUse_No;
// open the GPIO driver to get a handle to it
gpio0 = Gpio_open(&gpioParams);
// Configure GPIO2_13 as an output
UserPinCmdArg.pin = GPIO2_13_PIN;
UserPinCmdArg.value = Gpio_Direction_Input;
Gpio_setPinDir(gpio0,&UserPinCmdArg);
// Enable GPIO Bank interrupt for bank GPIO_BANK_2
Gpio_bankInterruptEnable(gpio0,GPIO_BANK_2);
// Configure GPIO(GPIO0_8_PIN) to generate interrupt on falling edge
Gpio_setFallingEdgeTrigger(gpio0,GPIO2_13_PIN);
// Set the interrupt handler for GPIO0_8_PIN. However we cannot register
// interrupts for individual pins in OMAPL137, therefore register interrupt
// for the associated bank(BANK0) as a whole
UserIntrCmdArg.value = GPIO_BANK_2;
UserIntrCmdArg.bankOrPin = Gpio_BankOrPin_isBank;
UserIntrCmdArg.isrHandler = (Gpio_Isr)&gpio_input_isr;
Gpio_regIntHandler(gpio0,&UserIntrCmdArg);
where
GPIO_BANK_2 = 2 and
GPIO2_13_PIN = 45
- finally the interrupt function simply sets a flag:
extern Bool vsync;
Void gpio_input_isr(Ptr ignore)
{
ignore = ignore;
vsync = TRUE;
}
So I'm not pretty sure what is causing the problem? Some missing or wrong configuration? or is the input signal that has bad characteristics? Could somebody help me getting this to work? Thank you very much.
Andreas