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Fix interrupt emulation in Raspberry Pi example

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This commit is contained in:
jgromes 2024-04-14 14:37:55 +01:00
parent 91f89fa1f3
commit 46ef20ebe9
2 changed files with 50 additions and 6 deletions
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55
examples/NonArduino/Raspberry/PiHal.h
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@ -7,6 +7,14 @@
// include the library for Raspberry GPIO pins // include the library for Raspberry GPIO pins
#include "pigpio.h" #include "pigpio.h"
// these should really be swapped, but for some reason,
// it seems like the change directions are inverted in gpioSetAlert functions
#define PI_RISING (FALLING_EDGE)
#define PI_FALLING (RISING_EDGE)
// forward declaration of alert handler that will be used to emulate interrupts
static void pigpioAlertHandler(int event, int level, uint32_t tick, void *userdata);
// create a new Raspberry Pi hardware abstraction layer // create a new Raspberry Pi hardware abstraction layer
// using the pigpio library // using the pigpio library
// the HAL must inherit from the base RadioLibHal class // the HAL must inherit from the base RadioLibHal class
@ -15,7 +23,7 @@ class PiHal : public RadioLibHal {
public: public:
// default constructor - initializes the base HAL and any needed private members // default constructor - initializes the base HAL and any needed private members
PiHal(uint8_t spiChannel, uint32_t spiSpeed = 2000000) PiHal(uint8_t spiChannel, uint32_t spiSpeed = 2000000)
: RadioLibHal(PI_INPUT, PI_OUTPUT, PI_LOW, PI_HIGH, RISING_EDGE, FALLING_EDGE), : RadioLibHal(PI_INPUT, PI_OUTPUT, PI_LOW, PI_HIGH, PI_RISING, PI_FALLING),
_spiChannel(spiChannel), _spiChannel(spiChannel),
_spiSpeed(spiSpeed) { _spiSpeed(spiSpeed) {
} }
@ -71,19 +79,31 @@ class PiHal : public RadioLibHal {
} }
void attachInterrupt(uint32_t interruptNum, void (*interruptCb)(void), uint32_t mode) override { void attachInterrupt(uint32_t interruptNum, void (*interruptCb)(void), uint32_t mode) override {
if(interruptNum == RADIOLIB_NC) { if((interruptNum == RADIOLIB_NC) || (interruptNum > PI_MAX_USER_GPIO)) {
return; return;
} }
gpioSetISRFunc(interruptNum, mode, 0, (gpioISRFunc_t)interruptCb); // enable emulated interrupt
interruptEnabled[interruptNum] = true;
interruptModes[interruptNum] = mode;
interruptCallbacks[interruptNum] = interruptCb;
// set pigpio alert callback
gpioSetAlertFuncEx(interruptNum, pigpioAlertHandler, (void*)this);
} }
void detachInterrupt(uint32_t interruptNum) override { void detachInterrupt(uint32_t interruptNum) override {
if(interruptNum == RADIOLIB_NC) { if((interruptNum == RADIOLIB_NC) || (interruptNum > PI_MAX_USER_GPIO)) {
return; return;
} }
gpioSetISRFunc(interruptNum, 0, 0, NULL); // clear emulated interrupt
interruptEnabled[interruptNum] = false;
interruptModes[interruptNum] = 0;
interruptCallbacks[interruptNum] = NULL;
// disable pigpio alert callback
gpioSetAlertFuncEx(interruptNum, NULL, NULL);
} }
void delay(unsigned long ms) override { void delay(unsigned long ms) override {
@ -120,7 +140,7 @@ class PiHal : public RadioLibHal {
return(this->micros() - start); return(this->micros() - start);
} }
void spiBegin() { void spiBegin() {
if(_spiHandle < 0) { if(_spiHandle < 0) {
_spiHandle = spiOpen(_spiChannel, _spiSpeed, 0); _spiHandle = spiOpen(_spiChannel, _spiSpeed, 0);
} }
@ -141,6 +161,12 @@ class PiHal : public RadioLibHal {
} }
} }
// interrupt emulation
bool interruptEnabled[PI_MAX_USER_GPIO + 1];
uint32_t interruptModes[PI_MAX_USER_GPIO + 1];
typedef void (*RadioLibISR)(void);
RadioLibISR interruptCallbacks[PI_MAX_USER_GPIO + 1];
private: private:
// the HAL can contain any additional private members // the HAL can contain any additional private members
const unsigned int _spiSpeed; const unsigned int _spiSpeed;
@ -148,4 +174,21 @@ class PiHal : public RadioLibHal {
int _spiHandle = -1; int _spiHandle = -1;
}; };
// this handler emulates interrupts
static void pigpioAlertHandler(int event, int level, uint32_t tick, void *userdata) {
if((event > PI_MAX_USER_GPIO) || (!userdata)) {
return;
}
// PiHal isntance is passed via the user data
PiHal* hal = (PiHal*)userdata;
// check the interrupt is enabled, the level matches and a callback exists
if((hal->interruptEnabled[event]) &&
(hal->interruptModes[event] == level) &&
(hal->interruptCallbacks[event])) {
hal->interruptCallbacks[event]();
}
}
#endif #endif

1
examples/NonArduino/Raspberry/build.sh
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@ -6,3 +6,4 @@ cd build
cmake -G "CodeBlocks - Unix Makefiles" .. cmake -G "CodeBlocks - Unix Makefiles" ..
make make
cd .. cd ..
size build/rpi-sx1261