static void avr_timer_reset(avr_io_t * port)
{
avr_timer_t * p = (avr_timer_t *)port;
avr_cycle_timer_cancel(p->io.avr, avr_timer_tov, p);
avr_cycle_timer_cancel(p->io.avr, avr_timer_compa, p);
avr_cycle_timer_cancel(p->io.avr, avr_timer_compb, p);
avr_cycle_timer_cancel(p->io.avr, avr_timer_compc, p);
// check to see if the comparators have a pin output. If they do,
// (try) to get the ioport corresponding IRQ and connect them
// they will automagically be triggered when the comparator raises
// it's own IRQ
for (int compi = 0; compi < AVR_TIMER_COMP_COUNT; compi++) {
p->comp[compi].comp_cycles = 0;
avr_ioport_getirq_t req = {
.bit = p->comp[compi].com_pin
};
if (avr_ioctl(port->avr, AVR_IOCTL_IOPORT_GETIRQ_REGBIT, &req) > 0) {
// cool, got an IRQ
// printf("%s-%c COMP%c Connecting PIN IRQ %d\n", __FUNCTION__, p->name, 'A'+compi, req.irq[0]->irq);
avr_connect_irq(&port->irq[TIMER_IRQ_OUT_COMP + compi], req.irq[0]);
}
}
avr_ioport_getirq_t req = {
.bit = p->icp
};
if (avr_ioctl(port->avr, AVR_IOCTL_IOPORT_GETIRQ_REGBIT, &req) > 0) {
// cool, got an IRQ for the input capture pin
// printf("%s-%c ICP Connecting PIN IRQ %d\n", __FUNCTION__, p->name, req.irq[0]->irq);
avr_irq_register_notify(req.irq[0], avr_timer_irq_icp, p);
}
}
static const char * irq_names[TIMER_IRQ_COUNT] = {
[TIMER_IRQ_OUT_PWM0] = "8>pwm0",
[TIMER_IRQ_OUT_PWM1] = "8>pwm1",
[TIMER_IRQ_OUT_COMP + 0] = ">compa",
[TIMER_IRQ_OUT_COMP + 1] = ">compb",
[TIMER_IRQ_OUT_COMP + 2] = ">compc",
};
static avr_io_t _io = {
.kind = "timer",
.reset = avr_timer_reset,
.irq_names = irq_names,
};
void avr_timer_init(avr_t * avr, avr_timer_t * p)
{
p->io = _io;
avr_register_io(avr, &p->io);
avr_register_vector(avr, &p->overflow);
avr_register_vector(avr, &p->icr);
// allocate this module's IRQ
avr_io_setirqs(&p->io, AVR_IOCTL_TIMER_GETIRQ(p->name), TIMER_IRQ_COUNT, NULL);
// marking IRQs as "filtered" means they don't propagate if the
// new value raised is the same as the last one.. in the case of the
// pwm value it makes sense not to bother.
p->io.irq[TIMER_IRQ_OUT_PWM0].flags |= IRQ_FLAG_FILTERED;
p->io.irq[TIMER_IRQ_OUT_PWM1].flags |= IRQ_FLAG_FILTERED;
if (p->wgm[0].reg) // these are not present on older AVRs
avr_register_io_write(avr, p->wgm[0].reg, avr_timer_write, p);
avr_register_io_write(avr, p->cs[0].reg, avr_timer_write, p);
// this assumes all the "pending" interrupt bits are in the same
// register. Might not be true on all devices ?
avr_register_io_write(avr, p->overflow.raised.reg, avr_timer_write_pending, p);
/*
* Even if the timer is 16 bits, we don't care to have watches on the
* high bytes because the datasheet says that the low address is always
* the trigger.
*/
for (int compi = 0; compi < AVR_TIMER_COMP_COUNT; compi++) {
avr_register_vector(avr, &p->comp[compi].interrupt);
if (p->comp[compi].r_ocr) // not all timers have all comparators
avr_register_io_write(avr, p->comp[compi].r_ocr, avr_timer_write_ocr, p);
}
avr_register_io_write(avr, p->r_tcnt, avr_timer_tcnt_write, p);
avr_register_io_read(avr, p->r_tcnt, avr_timer_tcnt_read, p);
}
int main(int argc, char *argv[])
{
elf_firmware_t f;
const char * fname = "atmega168_timer_64led.axf";
//char path[256];
// sprintf(path, "%s/%s", dirname(argv[0]), fname);
//printf("Firmware pathname is %s\n", path);
elf_read_firmware(fname, &f);
printf("firmware %s f=%d mmcu=%s\n", fname, (int)f.frequency, f.mmcu);
avr = avr_make_mcu_by_name(f.mmcu);
if (!avr) {
fprintf(stderr, "%s: AVR '%s' now known\n", argv[0], f.mmcu);
exit(1);
}
avr_init(avr);
avr_load_firmware(avr, &f);
//
// initialize our 'peripherals'
//
hc595_init(avr, &shifter);
button_init(avr, &button[B_START], "button.start");
avr_connect_irq(
button[B_START].irq + IRQ_BUTTON_OUT,
avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('C'), 0));
button_init(avr, &button[B_STOP], "button.stop");
avr_connect_irq(
button[B_STOP].irq + IRQ_BUTTON_OUT,
avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), 1));
button_init(avr, &button[B_RESET], "button.reset");
avr_connect_irq(
button[B_RESET].irq + IRQ_BUTTON_OUT,
avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), 0));
// connects the fake 74HC595 array to the pins
avr_irq_t * i_mosi = avr_io_getirq(avr, AVR_IOCTL_SPI_GETIRQ(0), SPI_IRQ_OUTPUT),
* i_reset = avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('D'), 4),
* i_latch = avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('D'), 7);
avr_connect_irq(i_mosi, shifter.irq + IRQ_HC595_SPI_BYTE_IN);
avr_connect_irq(i_reset, shifter.irq + IRQ_HC595_IN_RESET);
avr_connect_irq(i_latch, shifter.irq + IRQ_HC595_IN_LATCH);
avr_irq_t * i_pwm = avr_io_getirq(avr, AVR_IOCTL_TIMER_GETIRQ('0'), TIMER_IRQ_OUT_PWM0);
avr_irq_register_notify(
i_pwm,
pwm_changed_hook,
NULL);
avr_irq_register_notify(
shifter.irq + IRQ_HC595_OUT,
hc595_changed_hook,
NULL);
// even if not setup at startup, activate gdb if crashing
avr->gdb_port = 1234;
if (0) {
//avr->state = cpu_Stopped;
avr_gdb_init(avr);
}
/*
* VCD file initialization
*
* This will allow you to create a "wave" file and display it in gtkwave
* Pressing "r" and "s" during the demo will start and stop recording
* the pin changes
*/
avr_vcd_init(avr, "gtkwave_output.vcd", &vcd_file, 10000 /* usec */);
avr_vcd_add_signal(&vcd_file,
avr_get_interrupt_irq(avr, 7), 1 /* bit */ ,
"TIMER2_COMPA" );
avr_vcd_add_signal(&vcd_file,
avr_get_interrupt_irq(avr, 17), 1 /* bit */ ,
"SPI_INT" );
avr_vcd_add_signal(&vcd_file,
i_mosi, 8 /* bits */ ,
"MOSI" );
avr_vcd_add_signal(&vcd_file,
i_reset, 1 /* bit */ ,
"595_RESET" );
avr_vcd_add_signal(&vcd_file,
i_latch, 1 /* bit */ ,
"595_LATCH" );
avr_vcd_add_signal(&vcd_file,
button[B_START].irq + IRQ_BUTTON_OUT, 1 /* bits */ ,
"start" );
avr_vcd_add_signal(&vcd_file,
button[B_STOP].irq + IRQ_BUTTON_OUT, 1 /* bits */ ,
"stop" );
avr_vcd_add_signal(&vcd_file,
button[B_RESET].irq + IRQ_BUTTON_OUT, 1 /* bits */ ,
"reset" );
avr_vcd_add_signal(&vcd_file,
shifter.irq + IRQ_HC595_OUT, 32 /* bits */ ,
"HC595" );
avr_vcd_add_signal(&vcd_file,
i_pwm, 8 /* bits */ ,
"PWM" );
// 'raise' it, it's a "pullup"
avr_raise_irq(button[B_START].irq + IRQ_BUTTON_OUT, 1);
avr_raise_irq(button[B_STOP].irq + IRQ_BUTTON_OUT, 1);
avr_raise_irq(button[B_RESET].irq + IRQ_BUTTON_OUT, 1);
printf( "Demo : This is a real world firmware, a 'stopwatch'\n"
" timer that can count up to 99 days. It features a PWM control of the\n"
" brightness, blinks the dots, displays the number of days spent and so on.\n\n"
" Press '0' to press the 'start' button\n"
" Press '1' to press the 'stop' button\n"
" Press '2' to press the 'reset' button\n"
" Press 'q' to quit\n\n"
" Press 'r' to start recording a 'wave' file - with a LOT of data\n"
" Press 's' to stop recording\n"
" + Make sure to watch the brightness dim once you stop the timer\n\n"
);
/*
* OpenGL init, can be ignored
*/
glutInit(&argc, argv); /* initialize GLUT system */
int w = 22, h = 8;
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutInitWindowSize(w * pixsize, h * pixsize); /* width=400pixels height=500pixels */
window = glutCreateWindow("Press 0, 1, 2 or q"); /* create window */
// Set up projection matrix
glMatrixMode(GL_PROJECTION); // Select projection matrix
glLoadIdentity(); // Start with an identity matrix
glOrtho(0, w * pixsize, 0, h * pixsize, 0, 10);
glScalef(1,-1,1);
glTranslatef(0, -1 * h * pixsize, 0);
glutDisplayFunc(displayCB); /* set window's display callback */
glutKeyboardFunc(keyCB); /* set window's key callback */
glutTimerFunc(1000 / 24, timerCB, 0);
// the AVR run on it's own thread. it even allows for debugging!
pthread_t run;
pthread_create(&run, NULL, avr_run_thread, NULL);
glutMainLoop();
}
