--- /dev/null
+/*
+ * Copyright © 2011 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; version 2 of the License.
+ *
+ * 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"
+
+struct ao_task __xdata ao_usb_task;
+
+static __xdata uint16_t ao_usb_in_bytes;
+static __xdata uint16_t ao_usb_in_bytes_last;
+static __xdata uint16_t ao_usb_out_bytes;
+static __xdata uint8_t ao_usb_iif;
+static __xdata uint8_t ao_usb_running;
+
+static void
+ao_usb_set_interrupts(void)
+{
+ /* IN interrupts on the control an IN endpoints */
+ USBIIE = (1 << AO_USB_CONTROL_EP) | (1 << AO_USB_IN_EP);
+
+ /* OUT interrupts on the OUT endpoint */
+ USBOIE = (1 << AO_USB_OUT_EP);
+
+ /* Only care about reset */
+ USBCIE = USBCIE_RSTIE;
+}
+
+void
+ao_usb_set_address(uint8_t address)
+{
+ UDADD = (0 << ADDEN) | address;
+ ao_usb_running = 1;
+}
+
+#define EP_SIZE(s) ((s) == 64 ? 0x30 : \
+ ((s) == 32 ? 0x20 : \
+ ((s) == 16 ? 0x10 : \
+ 0x00)))
+
+static void
+ao_usb_set_ep0(void)
+{
+ /* Set the CONTROL max packet size, single buffered */
+ UENUM = 0;
+ UECONX = (1 << EPEN); /* Enable */
+
+ UECFG0X = ((0 << EPTYPE0) | /* Control */
+ (0 << EPDIR)); /* Out (ish) */
+
+ UECFG1X = ((EP_SIZE(AO_USB_CONTROL_SIZE) << EPSIZE0) | /* Size */
+ (0 << EPBK)); /* Single bank */
+
+ UEIENX = ((1 << RXSTPE) | /* Enable SETUP interrupt */
+ (1 << RXOUTE) | /* Enable OUT interrupt */
+ (1 << TXINE)); /* Enable IN complete interrupt */
+}
+
+static void
+ao_usb_set_configuration(void)
+{
+ /* Set the IN max packet size, double buffered */
+ UENUM = AO_USB_IN_EP;
+ UECONX = (1 << EPEN); /* Enable */
+
+ UECFG0X = ((2 << EPTYPE0) | /* Bulk */
+ (1 << EPDIR)); /* In */
+
+ UECFG1X = ((EP_SIZE(AO_USB_IN_SIZE) << EPSIZE0) | /* Size */
+ (1 << EPBK) | /* Double bank */
+ (1 << ALLOC)); /* Allocate */
+
+ /* Set the OUT max packet size, double buffered */
+ UENUM = AO_USB_OUT_EP;
+ UECONX |= (1 << EPEN); /* Enable */
+
+ UECFG0X = ((2 << EPTYPE0) | /* Bulk */
+ (0 << EPDIR)); /* Out */
+
+ UECFG1X = ((EP_SIZE(AO_USB_OUT_SIZE) << EPSIZE0) | /* Size */
+ (1 << EPBK) | /* Double bank */
+ (1 << ALLOC)); /* Allocate */
+}
+
+ISR(USB_GEN_vect)
+{
+ uint8_t intbits;
+
+ intbits = UDINT;
+ UDINT = 0;
+ if (intbits & (1<<EORSTI)) {
+ ao_usb_set_ep0();
+ usb_configuration = 0;
+ }
+ if (intbits & (1<<SOFI)) {
+ if (usb_configuration) {
+ t = transmit_flush_timer;
+ if (t) {
+ transmit_flush_timer = --t;
+ if (!t) {
+ UENUM = CDC_TX_ENDPOINT;
+ UEINTX = 0x3A;
+ }
+ }
+ }
+ }
+}
+
+struct ao_usb_setup {
+ uint8_t dir_type_recip;
+ uint8_t request;
+ uint16_t value;
+ uint16_t index;
+ uint16_t length;
+} __xdata ao_usb_setup;
+
+__xdata uint8_t ao_usb_ep0_state;
+uint8_t * __xdata ao_usb_ep0_in_data;
+__xdata uint8_t ao_usb_ep0_in_len;
+__xdata uint8_t ao_usb_ep0_in_buf[2];
+__xdata uint8_t ao_usb_ep0_out_len;
+__xdata uint8_t *__xdata ao_usb_ep0_out_data;
+__xdata uint8_t ao_usb_configuration;
+
+/* Send an IN data packet */
+static void
+ao_usb_ep0_flush(void)
+{
+ __xdata uint8_t this_len;
+ __xdata uint8_t cs0;
+
+ /* If the IN packet hasn't been picked up, just return */
+ UENUM = 0;
+ if (!(UEINTX & (1 << TXINI)))
+ return;
+
+ this_len = ao_usb_ep0_in_len;
+ if (this_len > AO_USB_CONTROL_SIZE)
+ this_len = AO_USB_CONTROL_SIZE;
+
+ ao_usb_ep0_in_len -= this_len;
+ while (this_len--)
+ UEDATX = *ao_usb_ep0_in_data++;
+
+ /* Clear the TXINI bit to send the packet */
+ UEINTX &= ~(1 << TXINI);
+}
+
+__xdata static struct ao_usb_line_coding ao_usb_line_coding = {115200, 0, 0, 8};
+
+/* Walk through the list of descriptors and find a match
+ */
+static void
+ao_usb_get_descriptor(uint16_t value)
+{
+ const uint8_t *__xdata descriptor;
+ __xdata uint8_t type = value >> 8;
+ __xdata uint8_t index = value;
+
+ descriptor = ao_usb_descriptors;
+ while (descriptor[0] != 0) {
+ if (descriptor[1] == type && index-- == 0) {
+ if (type == AO_USB_DESC_CONFIGURATION)
+ ao_usb_ep0_in_len = descriptor[2];
+ else
+ ao_usb_ep0_in_len = descriptor[0];
+ ao_usb_ep0_in_data = descriptor;
+ break;
+ }
+ descriptor += descriptor[0];
+ }
+}
+
+/* Read data from the ep0 OUT fifo
+ */
+static void
+ao_usb_ep0_fill(void)
+{
+ __xdata uint8_t len;
+
+ UENUM = 0;
+ len = UEBCLX; /* read length */
+ if (len > ao_usb_ep0_out_len)
+ len = ao_usb_ep0_out_len;
+ ao_usb_ep0_out_len -= len;
+
+ /* Pull all of the data out of the packet */
+ while (len--)
+ *ao_usb_ep0_out_data++ = UEDATX;
+}
+
+void
+ao_usb_ep0_queue_byte(uint8_t a)
+{
+ ao_usb_ep0_in_buf[ao_usb_ep0_in_len++] = a;
+}
+
+static void
+ao_usb_ep0_setup(void)
+{
+ /* Pull the setup packet out of the fifo */
+ ao_usb_ep0_out_data = (__xdata uint8_t *) &ao_usb_setup;
+ ao_usb_ep0_out_len = 8;
+ ao_usb_ep0_fill();
+ UENUM = 0;
+ UEINTX &= ~(1 << RXSTPI);
+ if (ao_usb_ep0_out_len != 0)
+ return;
+
+ /* Figure out how to ACK the setup packet */
+ if (ao_usb_setup.dir_type_recip & AO_USB_DIR_IN) {
+ if (ao_usb_setup.length)
+ ao_usb_ep0_state = AO_USB_EP0_DATA_IN;
+ else
+ ao_usb_ep0_state = AO_USB_EP0_IDLE;
+ } else {
+ if (ao_usb_setup.length)
+ ao_usb_ep0_state = AO_USB_EP0_DATA_OUT;
+ else
+ ao_usb_ep0_state = AO_USB_EP0_IDLE;
+ }
+ UENUM = 0;
+/*
+ if (ao_usb_ep0_state == AO_USB_EP0_IDLE)
+ USBCS0 = USBCS0_CLR_OUTPKT_RDY | USBCS0_DATA_END;
+ else
+ USBCS0 = USBCS0_CLR_OUTPKT_RDY;
+*/
+
+ ao_usb_ep0_in_data = ao_usb_ep0_in_buf;
+ ao_usb_ep0_in_len = 0;
+ switch(ao_usb_setup.dir_type_recip & AO_USB_SETUP_TYPE_MASK) {
+ case AO_USB_TYPE_STANDARD:
+ switch(ao_usb_setup.dir_type_recip & AO_USB_SETUP_RECIP_MASK) {
+ case AO_USB_RECIP_DEVICE:
+ switch(ao_usb_setup.request) {
+ case AO_USB_REQ_GET_STATUS:
+ ao_usb_ep0_queue_byte(0);
+ ao_usb_ep0_queue_byte(0);
+ break;
+ case AO_USB_REQ_SET_ADDRESS:
+ ao_usb_set_address(ao_usb_setup.value);
+ break;
+ case AO_USB_REQ_GET_DESCRIPTOR:
+ ao_usb_get_descriptor(ao_usb_setup.value);
+ break;
+ case AO_USB_REQ_GET_CONFIGURATION:
+ ao_usb_ep0_queue_byte(ao_usb_configuration);
+ break;
+ case AO_USB_REQ_SET_CONFIGURATION:
+ ao_usb_configuration = ao_usb_setup.value;
+ ao_usb_set_configuration();
+ break;
+ }
+ break;
+ case AO_USB_RECIP_INTERFACE:
+ #pragma disable_warning 110
+ switch(ao_usb_setup.request) {
+ case AO_USB_REQ_GET_STATUS:
+ ao_usb_ep0_queue_byte(0);
+ ao_usb_ep0_queue_byte(0);
+ break;
+ case AO_USB_REQ_GET_INTERFACE:
+ ao_usb_ep0_queue_byte(0);
+ break;
+ case AO_USB_REQ_SET_INTERFACE:
+ break;
+ }
+ break;
+ case AO_USB_RECIP_ENDPOINT:
+ switch(ao_usb_setup.request) {
+ case AO_USB_REQ_GET_STATUS:
+ ao_usb_ep0_queue_byte(0);
+ ao_usb_ep0_queue_byte(0);
+ break;
+ }
+ break;
+ }
+ break;
+ case AO_USB_TYPE_CLASS:
+ switch (ao_usb_setup.request) {
+ case SET_LINE_CODING:
+ ao_usb_ep0_out_len = 7;
+ ao_usb_ep0_out_data = (__xdata uint8_t *) &ao_usb_line_coding;
+ break;
+ case GET_LINE_CODING:
+ ao_usb_ep0_in_len = 7;
+ ao_usb_ep0_in_data = (uint8_t *) &ao_usb_line_coding;
+ break;
+ case SET_CONTROL_LINE_STATE:
+ break;
+ }
+ break;
+ }
+ if (ao_usb_ep0_state != AO_USB_EP0_DATA_OUT) {
+ if (ao_usb_setup.length < ao_usb_ep0_in_len)
+ ao_usb_ep0_in_len = ao_usb_setup.length;
+ ao_usb_ep0_flush();
+ }
+}
+
+/* End point 0 receives all of the control messages. */
+static void
+ao_usb_ep0(void)
+{
+ __xdata uint8_t intx;
+
+ ao_usb_ep0_state = AO_USB_EP0_IDLE;
+ for (;;) {
+ cli();
+ for (;;) {
+ UENUM = 0;
+ intx = UEINTX;
+ if (intx & ((1 << RXOUTI) | (1 <<RXSTPI)))
+ break;
+ ao_sleep(&ao_usb_task);
+ }
+ sei();
+ if (intx & (1 << RXSTPI)) {
+ ao_usb_ep0_setup();
+ UENUM = 0;
+ UEINTX &= ~(1 << RXSTPI);
+ }
+ if (intx & (1 << RXOUTI)) {
+ ao_usb_ep0_fill();
+ UENUM = 0;
+ UEINTX &= ~(1 << RXOUTI);
+ }
+ }
+}
+
+/* Wait for a free IN buffer */
+static void
+ao_usb_in_wait(void)
+{
+ for (;;) {
+ UENUM = AO_USB_IN_EP;
+ if ((UEINTX & (1 << RWAL)))
+ break;
+ ao_sleep(&ao_usb_in_bytes);
+ }
+}
+
+void
+ao_usb_flush(void) __critical
+{
+ if (!ao_usb_running)
+ return;
+
+ /* If there are pending bytes, or if the last packet was full,
+ * send another IN packet
+ */
+ if (ao_usb_in_bytes || (ao_usb_in_bytes_last == AO_USB_IN_SIZE)) {
+ ao_usb_in_wait();
+ ao_usb_in_send();
+ }
+}
+
+void
+ao_usb_putchar(char c) __critical __reentrant
+{
+ if (!ao_usb_running)
+ return;
+
+ ao_usb_in_wait();
+
+ /* Queue a byte, sending the packet when full */
+ UENUM = AO_USB_IN_EP;
+ UEDATX = c;
+ if (++ao_usb_in_bytes == AO_USB_IN_SIZE)
+ ao_usb_in_send();
+}
+
+char
+ao_usb_pollchar(void) __critical
+{
+ char c;
+ if (ao_usb_out_bytes == 0) {
+ /* Check to see if a packet has arrived */
+ UENUM = AO_USB_OUT_EP;
+ if ((UEINTX & (1 << RXOUTI)) == 0)
+ return AO_READ_AGAIN;
+ ao_usb_out_bytes = (UEBCHX << 8) | UEBCLX;
+ if (ao_usb_out_bytes == 0) {
+ UEINTX &= ~(1 << RXOUTI);
+ return AO_READ_AGAIN;
+ }
+ }
+ --ao_usb_out_bytes;
+ UENUM = AO_USB_OUT_EP;
+ c = UEDATX;
+ if (ao_usb_out_bytes == 0) {
+ UENUM = AO_USB_OUT_EP;
+ UEINTX &= ~(1 << RXOUTI);
+ }
+ return c;
+}
+
+char
+ao_usb_getchar(void) __critical
+{
+ char c;
+
+ while ((c = ao_usb_pollchar()) == AO_READ_AGAIN)
+ ao_sleep(&ao_stdin_ready);
+ return c;
+}
+
+// Misc functions to wait for ready and send/receive packets
+static inline void usb_wait_in_ready(void)
+{
+ while (!(UEINTX & (1<<TXINI))) ;
+}
+static inline void usb_send_in(void)
+{
+ UEINTX = ~(1<<TXINI);
+}
+static inline void usb_wait_receive_out(void)
+{
+ while (!(UEINTX & (1<<RXOUTI))) ;
+}
+static inline void usb_ack_out(void)
+{
+ UEINTX = ~(1<<RXOUTI);
+}
+
+/* Endpoint 0 interrupt */
+
+ISR(USB_COM_vect)
+{
+ ao_wakeup(&ao_usb_task);
+}
+
+#if AVR_VCC_5V
+#define AO_PAD_REGULATOR_INIT (1 << UVREGE) /* Turn on pad regulator */
+#endif
+#if AVR_VCC_3V3
+#define AO_PAD_REGULATOR_INIT 0 /* Turn off pad regulator */
+#endif
+
+#if AVR_CLOCK == 16000000UL
+#define AO_USB_PLL_INPUT_PRESCALER (1 << PINDIV) /* Divide 16MHz clock by 2 */
+#endif
+#if AVR_CLOCK == 8000000UL
+#define AO_USB_PLL_INPUT_PRESCALER 0 /* Don't divide clock */
+#endif
+
+void
+ao_usb_disable(void)
+{
+ /* Unplug from the bus */
+ UDCON = (1 << DETACH);
+ ao_usb_detatch_interface();
+
+ /* Disable the interface */
+ USBCON = 0;
+
+ /* Disable the PLL */
+ PLLCSR = 0;
+
+ /* Turn off the pad regulator */
+ UHWCON = 0;
+}
+
+#define AO_USB_CON ((1 << USBE) | /* USB enable */ \
+ (0 << RSTCPU) | /* do not reset CPU */ \
+ (0 << LSM) | /* Full speed mode */ \
+ (0 << RMWKUP)) /* no remote wake-up */ \
+
+void
+ao_usb_enable(void)
+{
+ /* Configure pad regulator */
+ UHWCON = AO_PAD_REGULATOR_INIT;
+
+ /* Enable USB device, but freeze the clocks until initialized */
+ USBCON = AO_USB_CON | (1 <<FRZCLK);
+
+ /* Enable PLL with appropriate divider */
+ PLLCSR = AO_USB_PLL_INPUT_PRESCALER | (1 << PLLE);
+
+ /* Wait for PLL to lock */
+ loop_until_bit_is_set(PLLCSR, (1 << PLOCK));
+
+ /* Enable USB, enable the VBUS pad */
+ USBCON = AO_USB_CON | (1 << OTGPADE);
+
+ UDCON = (0 << DETACH); /* Clear the DETACH bit to plug into the bus */
+
+ usb_configuration = 0;
+}
+
+void
+ao_usb_init(void)
+{
+ ao_usb_enable();
+
+ ao_add_task(&ao_usb_task, ao_usb_ep0, "usb");
+ ao_add_stdio(ao_usb_pollchar, ao_usb_putchar, ao_usb_flush);
+}
projects / fw / altos / commitdiff