samd21: Stub out exti code

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/samd21/ao_exti_samd21.c b/src/samd21/ao_exti_samd21.c
new file mode 100644 (file)
index 0000000..aa865cc
--- /dev/null
+++ b/src/samd21/ao_exti_samd21.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright © 2022 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <ao.h>
+#include <ao_exti.h>
+
+struct samd21_exti {
+       void    (*callback)(void);
+       uint8_t port;
+       uint8_t pin;
+};
+
+#if 0
+static struct samd21_exti ao_samd_exti[SAMD21_NUM_EVSYS];
+
+static uint32_t ao_exti_inuse;
+#endif
+
+void
+samd21_evsys_isr(void)
+{
+}
+
+void
+ao_exti_setup (struct samd21_port *port, uint8_t pin, uint8_t mode, void (*callback)(void))
+{
+       (void) port;
+       (void) pin;
+       (void) mode;
+       (void) callback;
+#if 0
+       uint8_t         id = pin_id(port,pin);
+       uint8_t         pint;
+       uint8_t         mask;
+       uint8_t         prio;
+
+       for (pint = 0; pint < SAMD21_NUM_EVSYS; pint++)
+               if ((ao_exti_inuse & (1 << pint)) == 0)
+                       break;
+
+       if (pint == SAMD21_NUM_EVSYS)
+               ao_panic(AO_PANIC_EXTI);
+
+       if (!(mode & AO_EXTI_PIN_NOCONFIGURE))
+               ao_enable_input(port, pin, mode);
+
+       ao_arch_block_interrupts();
+       mask = (1 << pint);
+       ao_exti_inuse |= mask;
+       ao_pint_enabled &= (uint8_t) ~mask;
+
+       ao_pint_map[id] = pint;
+       ao_exti_callback[pint] = callback;
+
+       /* configure gpio to interrupt routing */
+       lpc_scb.pintsel[pint] = id;
+
+       /* Set edge triggered */
+       lpc_gpio_pin.isel &= ~mask;
+
+       ao_pint_enabled &= (uint8_t) ~mask;
+       ao_pint_mode[pint] = mode;
+       _ao_exti_set_enable(pint);
+
+       /* Set interrupt mask and rising/falling mode */
+
+       prio = AO_LPC_NVIC_MED_PRIORITY;
+       if (mode & AO_EXTI_PRIORITY_LOW)
+               prio = AO_LPC_NVIC_LOW_PRIORITY;
+       else if (mode & AO_EXTI_PRIORITY_HIGH)
+               prio = AO_LPC_NVIC_HIGH_PRIORITY;
+
+       /* Set priority and enable */
+       lpc_nvic_set_priority(LPC_ISR_PIN_INT0_POS + pint, prio);
+       lpc_nvic_set_enable(LPC_ISR_PIN_INT0_POS + pint);
+       ao_arch_release_interrupts();
+#endif
+}
+
+void
+ao_exti_set_mode(struct samd21_port *port, uint8_t pin, uint8_t mode)
+{
+       (void) port;
+       (void) pin;
+       (void) mode;
+#if 0
+       uint8_t         id = pin_id(port,pin);
+       uint8_t         pint = ao_pint_map[id];
+
+       ao_arch_block_interrupts();
+       ao_pint_mode[pint] = mode;
+       _ao_exti_set_enable(pint);
+       ao_arch_release_interrupts();
+#endif
+}
+
+void
+ao_exti_set_callback(struct samd21_port *port, uint8_t pin, void (*callback)(void))
+{
+       (void) port;
+       (void) pin;
+       (void) callback;
+#if 0
+       uint8_t         id = pin_id(port,pin);
+       uint8_t         pint = ao_pint_map[id];
+
+       ao_exti_callback[pint] = callback;
+#endif
+}
+
+void
+ao_exti_enable(struct samd21_port *port, uint8_t pin)
+{
+       (void) port;
+       (void) pin;
+#if 0
+       uint8_t         id = pin_id(port,pin);
+       uint8_t         pint = ao_pint_map[id];
+       uint8_t         mask = 1 << pint;
+
+       ao_arch_block_interrupts();
+       ao_pint_enabled |= mask;
+       _ao_exti_set_enable(pint);
+       ao_arch_release_interrupts();
+#endif
+}
+
+void
+ao_exti_disable(struct samd21_port *port, uint8_t pin)
+{
+       (void) port;
+       (void) pin;
+#if 0
+       uint8_t         id = pin_id(port,pin);
+       uint8_t         pint = ao_pint_map[id];
+       uint8_t         mask = 1 << pint;
+
+       ao_arch_block_interrupts();
+       ao_pint_enabled &= (uint8_t) ~mask;
+       _ao_exti_set_enable(pint);
+       ao_arch_release_interrupts();
+#endif
+}
+
+void
+ao_exti_init(void)
+{
+}

diff --git a/src/samd21/samd21.h b/src/samd21/samd21.h
index cd9d2d3464f296d2f3fcd7263eb106505995086a..331fb7233ba4e17de39db6be7379f3dac904d174 100644 (file)
--- a/src/samd21/samd21.h
+++ b/src/samd21/samd21.h
@@ -1373,6 +1373,28 @@ samd21_usb_ep_curbk(uint8_t ep)
        return (samd21_usb.ep[ep].epstatus >> SAMD21_USB_EP_EPSTATUS_CURBK) & 1;
 }
 
+/* evsys */
+
+struct samd21_evsys {
+       vuint8_t        ctrl;
+       vuint8_t        reserved_01;
+       vuint16_t       reserved_02;
+       vuint32_t       channel;
+       vuint16_t       user;
+       vuint16_t       reserved_0a;
+       vuint32_t       chstatus;
+
+       vuint32_t       intenclr;
+       vuint32_t       intenset;
+       vuint32_t       intflag;
+};
+
+extern struct samd21_evsys samd21_evsys;
+
+#define SAMD21_NUM_EVSYS       16
+
+#define samd21_evsys   (*(struct samd21_evsys *) 0x42000400)
+
 /* sercom */
 
 struct samd21_sercom {