#include <stdio.h>
#include "avr_ioport.h"
-static void avr_ioport_run(avr_t * avr, avr_io_t * port)
+static uint8_t avr_ioport_read(struct avr_t * avr, avr_io_addr_t addr, void * param)
{
- //printf("%s\n", __FUNCTION__);
+ avr_ioport_t * p = (avr_ioport_t *)param;
+ uint8_t ddr = avr->data[p->r_ddr];
+ uint8_t v = (avr->data[p->r_pin] & ~ddr) | (avr->data[p->r_port] & ddr);
+ avr->data[addr] = v;
+ // made to trigger potential watchpoints
+ v = avr_core_watch_read(avr, addr);
+// printf("** PIN%c(%02x) = %02x\n", p->name, addr, v);
+
+ return v;
}
-static uint8_t avr_ioport_read(struct avr_t * avr, uint8_t addr, void * param)
+static void avr_ioport_write(struct avr_t * avr, avr_io_addr_t addr, uint8_t v, void * param)
{
avr_ioport_t * p = (avr_ioport_t *)param;
- uint8_t v = avr->data[addr];
- if (addr == p->r_pin) {
- uint8_t v = avr->data[p->r_port];
- avr->data[addr] = v;
- // made to trigger potential watchpoints
- v = avr_core_watch_read(avr, addr);
-// printf("** PIN%c(%02x) = %02x\n", p->name, addr, v);
- }
- return v;
+ avr_core_watch_write(avr, addr, v);
+ // printf("PORT%c(%02x) = %02x (was %02x)\n", p->name, addr, v, oldv);
+
+ // raise the internal IRQ callbacks
+ for (int i = 0; i < 8; i++)
+ avr_raise_irq(p->io.irq + i, (v >> i) & 1);
+ avr_raise_irq(p->io.irq + IOPORT_IRQ_PIN_ALL, v);
}
-static void avr_ioport_write(struct avr_t * avr, uint8_t addr, uint8_t v, void * param)
+/*
+ * This is a reasonably new behaviour for the io-ports. Writing 1's to the PIN register
+ * toggles the PORT equivalent bit (regardless of direction
+ */
+static void avr_ioport_pin_write(struct avr_t * avr, avr_io_addr_t addr, uint8_t v, void * param)
{
avr_ioport_t * p = (avr_ioport_t *)param;
- uint8_t oldv = avr->data[addr];
- if (addr == p->r_port) {
- // printf("PORT%c(%02x) = %02x (was %02x)\n", p->name, addr, v, oldv);
+ avr_ioport_write(avr, p->r_port, avr->data[p->r_port] ^ v, param);
+}
- avr_core_watch_write(avr, addr, v);
- if (v != oldv) {
- int raise = 1;
- int mask = v ^ oldv;
- if (p->r_pcint)
- raise = avr->data[p->r_pcint] & mask;
- if (raise)
- avr_raise_interupt(avr, &p->pcint);
- }
+/*
+ * This is a the callback for the DDR register. There is nothing much to do here, apart
+ * from triggering an IRQ in case any 'client' code is interested in the information,
+ * and restoring all PIN bits marked as output to PORT values.
+ */
+static void avr_ioport_ddr_write(struct avr_t * avr, avr_io_addr_t addr, uint8_t v, void * param)
+{
+ avr_ioport_t * p = (avr_ioport_t *)param;
+ avr_raise_irq(p->io.irq + IOPORT_IRQ_DIRECTION_ALL, v);
+ avr_core_watch_write(avr, addr, v);
- if (p->name == 'D') {
- static int cs = -1;
- if ((oldv & 0xf0) != (v & 0xf0)) {
- for (int i = 0; i < 4; i++) {
-
+ const uint8_t oldpin = avr->data[p->r_pin];
+ const uint8_t pin = (oldpin & ~v) | (avr->data[p->r_port] & v);
+ avr_core_watch_write(avr, p->r_pin, pin);
+ for (int i = 0; i < 8; i++)
+ if (((oldpin ^ pin) >> i) & 1)
+ avr_raise_irq(p->io.irq + i, (pin >> i) & 1);
+ avr_raise_irq(p->io.irq + IOPORT_IRQ_PIN_ALL, pin);
+}
+
+/*
+ * this is our "main" pin change callback, it can be triggered by either the
+ * AVR code, or any external piece of code that see fit to do it.
+ * Either way, this will raise pin change interrupts, if needed
+ */
+void avr_ioport_irq_notify(struct avr_irq_t * irq, uint32_t value, void * param)
+{
+ avr_ioport_t * p = (avr_ioport_t *)param;
+ avr_t * avr = p->io.avr;
+
+ int output = value & AVR_IOPORT_OUTPUT;
+ value &= 0xff;
+ uint8_t mask = 1 << irq->irq;
+ // set the real PIN bit. ddr doesn't matter here as it's masked when read.
+ avr->data[p->r_pin] &= ~mask;
+ if (value)
+ avr->data[p->r_pin] |= mask;
+
+ if (output) // if the IRQ was marked as Output, also do the IO write
+ avr_ioport_write(avr, p->r_port, (avr->data[p->r_port] & ~mask) | (value ? mask : 0), p);
+
+ if (p->r_pcint) {
+ // if the pcint bit is on, try to raise it
+ int raise = avr->data[p->r_pcint] & mask;
+ if (raise)
+ avr_raise_interrupt(avr, &p->pcint);
+ }
+}
+
+static void avr_ioport_reset(avr_io_t * port)
+{
+ avr_ioport_t * p = (avr_ioport_t *)port;
+ for (int i = 0; i < IOPORT_IRQ_PIN_ALL; i++)
+ avr_irq_register_notify(p->io.irq + i, avr_ioport_irq_notify, p);
+}
+
+static int avr_ioport_ioctl(struct avr_io_t * port, uint32_t ctl, void * io_param)
+{
+ avr_ioport_t * p = (avr_ioport_t *)port;
+ avr_t * avr = p->io.avr;
+ int res = -1;
+
+ switch(ctl) {
+ case AVR_IOCTL_IOPORT_GETIRQ_REGBIT: {
+ avr_ioport_getirq_t * r = (avr_ioport_getirq_t*)io_param;
+
+ if (r->bit.reg == p->r_port || r->bit.reg == p->r_pin || r->bit.reg == p->r_ddr) {
+ // it's us ! check the special case when the "all pins" irq is requested
+ int o = 0;
+ if (r->bit.mask == 0xff)
+ r->irq[o++] = &p->io.irq[IOPORT_IRQ_PIN_ALL];
+ else {
+ // otherwise fill up the ones needed
+ for (int bi = 0; bi < 8; bi++)
+ if (r->bit.mask & (1 << bi))
+ r->irq[o++] = &p->io.irq[r->bit.bit + bi];
}
- }
- {
+ if (o < 8)
+ r->irq[o] = NULL;
+ return o;
+ }
+ } break;
+ default: {
+ /*
+ * Return the port state if the IOCTL matches us.
+ */
+ if (ctl == AVR_IOCTL_IOPORT_GETSTATE(p->name)) {
+ avr_ioport_state_t state = {
+ .name = p->name,
+ .port = avr->data[p->r_port],
+ .ddr = avr->data[p->r_ddr],
+ .pin = avr->data[p->r_pin],
+ };
+ if (io_param)
+ *((avr_ioport_state_t*)io_param) = state;
+ res = 0;
}
}
}
-}
-static void avr_ioport_reset(avr_t * avr, avr_io_t * port)
-{
+ return res;
}
+static const char * irq_names[IOPORT_IRQ_COUNT] = {
+ [IOPORT_IRQ_PIN0] = "=pin0",
+ [IOPORT_IRQ_PIN1] = "=pin1",
+ [IOPORT_IRQ_PIN2] = "=pin2",
+ [IOPORT_IRQ_PIN3] = "=pin3",
+ [IOPORT_IRQ_PIN4] = "=pin4",
+ [IOPORT_IRQ_PIN5] = "=pin5",
+ [IOPORT_IRQ_PIN6] = "=pin6",
+ [IOPORT_IRQ_PIN7] = "=pin7",
+ [IOPORT_IRQ_PIN_ALL] = "=all",
+ [IOPORT_IRQ_DIRECTION_ALL] = ">ddr",
+};
+
static avr_io_t _io = {
- .kind = "io",
- .run = avr_ioport_run,
+ .kind = "port",
.reset = avr_ioport_reset,
+ .ioctl = avr_ioport_ioctl,
+ .irq_names = irq_names,
};
-void avr_ioport_init(avr_t * avr, avr_ioport_t * port)
+void avr_ioport_init(avr_t * avr, avr_ioport_t * p)
{
- port->io = _io;
- printf("%s PIN%c 0x%02x DDR%c 0x%02x PORT%c 0x%02x\n",
- __FUNCTION__,
- port->name, port->r_pin,
- port->name, port->r_ddr,
- port->name, port->r_port);
-
- avr_register_io(avr, &port->io);
- avr_register_vector(avr, &port->pcint);
-
- avr_register_io_write(avr, port->r_port, avr_ioport_write, port);
- avr_register_io_read(avr, port->r_pin, avr_ioport_read, port);
+ p->io = _io;
+// printf("%s PIN%c 0x%02x DDR%c 0x%02x PORT%c 0x%02x\n", __FUNCTION__,
+// p->name, p->r_pin,
+// p->name, p->r_ddr,
+// p->name, p->r_port);
+
+ avr_register_io(avr, &p->io);
+ avr_register_vector(avr, &p->pcint);
+ // allocate this module's IRQ
+ avr_io_setirqs(&p->io, AVR_IOCTL_IOPORT_GETIRQ(p->name), IOPORT_IRQ_COUNT, NULL);
+
+ for (int i = 0; i < IOPORT_IRQ_COUNT; i++)
+ p->io.irq[i].flags |= IRQ_FLAG_FILTERED;
+
+ avr_register_io_write(avr, p->r_port, avr_ioport_write, p);
+ avr_register_io_read(avr, p->r_pin, avr_ioport_read, p);
+ avr_register_io_write(avr, p->r_pin, avr_ioport_pin_write, p);
+ avr_register_io_write(avr, p->r_ddr, avr_ioport_ddr_write, p);
}
projects / simavr / blobdiff