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authorjoeycastillo <joeycastillo@utexas.edu>2021-08-30 14:42:11 -0400
committerGitHub <noreply@github.com>2021-08-30 14:42:11 -0400
commiteb3d9b26cbda2d2612f11eb39843b221224f1fa7 (patch)
tree7a514b4d21dd0d2a324a5e1313a144f26bf20799 /watch-library/watch/watch_private.c
parentee9cc322d301631c9ff0751d9bed717c6492b6a5 (diff)
parentb0845cc3f1a8234a30c980eccf10e44765e4e105 (diff)
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Merge pull request #9 from joeycastillo/usb-refactor
USB refactor / Makefile simplification
Diffstat (limited to 'watch-library/watch/watch_private.c')
-rw-r--r--watch-library/watch/watch_private.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/watch-library/watch/watch_private.c b/watch-library/watch/watch_private.c
index cd9c2baa..a4e2f72c 100644
--- a/watch-library/watch/watch_private.c
+++ b/watch-library/watch/watch_private.c
@@ -22,6 +22,8 @@
* SOFTWARE.
*/
+#include "tusb.h"
+
void _watch_init() {
// disable the LED pin (it may have been enabled by the bootloader)
watch_disable_digital_output(RED);
@@ -42,3 +44,314 @@ void _watch_init() {
a2_callback = NULL;
a4_callback = NULL;
}
+
+void _watch_enable_tcc() {
+ // clock TCC0 with the main clock (8 MHz) and enable the peripheral clock.
+ hri_gclk_write_PCHCTRL_reg(GCLK, TCC0_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK0_Val | GCLK_PCHCTRL_CHEN);
+ hri_mclk_set_APBCMASK_TCC0_bit(MCLK);
+ // disable and reset TCC0.
+ hri_tcc_clear_CTRLA_ENABLE_bit(TCC0);
+ hri_tcc_wait_for_sync(TCC0, TCC_SYNCBUSY_ENABLE);
+ hri_tcc_write_CTRLA_reg(TCC0, TCC_CTRLA_SWRST);
+ hri_tcc_wait_for_sync(TCC0, TCC_SYNCBUSY_SWRST);
+ // have prescaler divide our 8 MHz clock down to 1 MHz.
+ hri_tcc_write_CTRLA_reg(TCC0, TCC_CTRLA_PRESCALER_DIV8);
+ // We're going to use normal PWM mode, which means period is controlled by PER, and duty cycle is controlled by
+ // each compare channel's value:
+ // * Buzzer tones are set by setting PER to the desired period for a given frequency, and CC[1] to half of that
+ // period (i.e. a square wave with a 50% duty cycle).
+ // * LEDs on CC[2] and CC[3] can be set to any value from 0 (off) to PER (fully on).
+ hri_tcc_write_WAVE_reg(TCC0, TCC_WAVE_WAVEGEN_NPWM);
+ // The buzzer will set the period depending on the tone it wants to play, but we have to set some period here to
+ // get the LED working. Almost any period will do, tho it should be below 20000 (i.e. 50 Hz) to avoid flickering.
+ hri_tcc_write_PER_reg(TCC0, 4096);
+ // Set the duty cycle of all pins to 0: LED's off, buzzer not buzzing.
+ hri_tcc_write_CC_reg(TCC0, 1, 0);
+ hri_tcc_write_CC_reg(TCC0, 2, 0);
+ hri_tcc_write_CC_reg(TCC0, 3, 0);
+ // Enable the TCC
+ hri_tcc_set_CTRLA_ENABLE_bit(TCC0);
+ hri_tcc_wait_for_sync(TCC0, TCC_SYNCBUSY_ENABLE);
+
+ // enable LED PWM pins (the LED driver assumes if the TCC is on, the pins are enabled)
+ gpio_set_pin_direction(RED, GPIO_DIRECTION_OUT);
+ gpio_set_pin_function(RED, PINMUX_PA20F_TCC0_WO6);
+ gpio_set_pin_direction(GREEN, GPIO_DIRECTION_OUT);
+ gpio_set_pin_function(GREEN, PINMUX_PA21F_TCC0_WO7);
+}
+
+void _watch_disable_tcc() {
+ // disable all PWM pins
+ gpio_set_pin_direction(BUZZER, GPIO_DIRECTION_OFF);
+ gpio_set_pin_function(BUZZER, GPIO_PIN_FUNCTION_OFF);
+ gpio_set_pin_direction(RED, GPIO_DIRECTION_OFF);
+ gpio_set_pin_function(RED, GPIO_PIN_FUNCTION_OFF);
+ gpio_set_pin_direction(GREEN, GPIO_DIRECTION_OFF);
+ gpio_set_pin_function(GREEN, GPIO_PIN_FUNCTION_OFF);
+
+ // disable the TCC
+ hri_tcc_clear_CTRLA_ENABLE_bit(TCC0);
+ hri_mclk_clear_APBCMASK_TCC0_bit(MCLK);
+}
+
+void _watch_enable_usb() {
+ // disable USB, just in case.
+ hri_usb_clear_CTRLA_ENABLE_bit(USB);
+
+ // reset flags and disable DFLL
+ OSCCTRL->INTFLAG.reg = OSCCTRL_INTFLAG_DFLLRDY;
+ OSCCTRL->DFLLCTRL.reg = 0;
+ while (!(OSCCTRL->STATUS.reg & OSCCTRL_STATUS_DFLLRDY));
+
+ // set the coarse and fine values to speed up frequency lock.
+ uint32_t coarse =(*((uint32_t *)NVMCTRL_OTP5)) >> 26;
+ OSCCTRL->DFLLVAL.reg = OSCCTRL_DFLLVAL_COARSE(coarse) |
+ OSCCTRL_DFLLVAL_FINE(0x200);
+ // set coarse and fine steps, and multiplier (48 MHz = 32768 Hz * 1465)
+ OSCCTRL->DFLLMUL.reg = OSCCTRL_DFLLMUL_CSTEP( 1 ) |
+ OSCCTRL_DFLLMUL_FSTEP( 1 ) |
+ OSCCTRL_DFLLMUL_MUL( 1465 );
+ // set closed loop mode, chill cycle disable and USB clock recovery mode, and enable the DFLL.
+ OSCCTRL->DFLLCTRL.reg = OSCCTRL_DFLLCTRL_MODE | OSCCTRL_DFLLCTRL_CCDIS | OSCCTRL_DFLLCTRL_ONDEMAND | OSCCTRL_DFLLCTRL_RUNSTDBY | OSCCTRL_DFLLCTRL_USBCRM | OSCCTRL_DFLLCTRL_ENABLE;
+ while (!(OSCCTRL->STATUS.reg & OSCCTRL_STATUS_DFLLRDY));
+
+ // assign DFLL to GCLK1
+ GCLK->GENCTRL[1].reg = GCLK_GENCTRL_SRC(GCLK_GENCTRL_SRC_DFLL48M) | GCLK_GENCTRL_DIV(1) | GCLK_GENCTRL_GENEN;// | GCLK_GENCTRL_OE;
+ while (GCLK->SYNCBUSY.bit.GENCTRL1);
+
+ // assign GCLK1 to USB
+ hri_gclk_write_PCHCTRL_reg(GCLK, USB_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK1_Val | GCLK_PCHCTRL_CHEN);
+ hri_mclk_set_AHBMASK_USB_bit(MCLK);
+ hri_mclk_set_APBBMASK_USB_bit(MCLK);
+
+ // USB Pin Init
+ gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
+ gpio_set_pin_level(PIN_PA24, false);
+ gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
+ gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
+ gpio_set_pin_level(PIN_PA25, false);
+ gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
+
+ gpio_set_pin_function(PIN_PA24, PINMUX_PA24G_USB_DM);
+ gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);
+
+ // before we init TinyUSB, we are going to need a periodic callback to handle TinyUSB tasks.
+ // TC2 and TC3 are reserved for devices on the 9-pin connector, so let's use TC0.
+ // clock TC0 with the 8 MHz clock on GCLK0.
+ hri_gclk_write_PCHCTRL_reg(GCLK, TC0_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK0_Val | GCLK_PCHCTRL_CHEN);
+ // and enable the peripheral clock.
+ hri_mclk_set_APBCMASK_TC0_bit(MCLK);
+ // disable and reset TC0.
+ hri_tc_clear_CTRLA_ENABLE_bit(TC0);
+ hri_tc_wait_for_sync(TC0, TC_SYNCBUSY_ENABLE);
+ hri_tc_write_CTRLA_reg(TC0, TC_CTRLA_SWRST);
+ hri_tc_wait_for_sync(TC0, TC_SYNCBUSY_SWRST);
+ // configure the TC to overflow 1,000 times per second
+ hri_tc_write_CTRLA_reg(TC0, TC_CTRLA_PRESCALER_DIV64 | // divide the 8 MHz clock by 64 to count at 125 KHz
+ TC_CTRLA_MODE_COUNT8 | // count in 8-bit mode
+ TC_CTRLA_RUNSTDBY); // run in standby, just in case we figure that out
+ hri_tccount8_write_PER_reg(TC0, 125); // 125000 Hz / 125 = 1,000 Hz
+ // set an interrupt on overflow; this will call TC0_Handler below.
+ hri_tc_set_INTEN_OVF_bit(TC0);
+ NVIC_ClearPendingIRQ(TC0_IRQn);
+ NVIC_EnableIRQ (TC0_IRQn);
+
+ // now we can init TinyUSB
+ tusb_init();
+ // and start the timer that handles USB device tasks.
+ hri_tc_set_CTRLA_ENABLE_bit(TC0);
+}
+
+// this function ends up getting called by printf to log stuff to the USB console.
+int _write(int file, char *ptr, int len) {
+ (void)file;
+ if (hri_usbdevice_get_CTRLA_ENABLE_bit(USB)) {
+ tud_cdc_n_write(0, (void const*)ptr, len);
+ tud_cdc_n_write_flush(0);
+ return len;
+ }
+
+ return 0;
+}
+
+// this method could be overridden to read stuff from the USB console? but no need rn.
+int _read() {
+ return 0;
+}
+
+// Alternate function that outputs to the debug UART. useful for debugging USB issues.
+// int _write(int file, char *ptr, int len) {
+// (void)file;
+// int pos = 0;
+// while(pos < len) watch_debug_putc(ptr[pos++]);
+
+// return 0;
+// }
+
+void USB_Handler(void) {
+ tud_int_handler(0);
+}
+
+void TC0_Handler(void) {
+ tud_task();
+ TC0->COUNT8.INTFLAG.reg |= TC_INTFLAG_OVF;
+}
+
+
+// USB Descriptors and tinyUSB callbacks follow.
+
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#include "tusb.h"
+
+/* A combination of interfaces must have a unique product id, since PC will save device driver after the first plug.
+ * Same VID/PID with different interface e.g MSC (first), then CDC (later) will possibly cause system error on PC.
+ *
+ * Auto ProductID layout's Bitmap:
+ * [MSB] HID | MSC | CDC [LSB]
+ */
+#define _PID_MAP(itf, n) ( (CFG_TUD_##itf) << (n) )
+#define USB_PID (0x4000 | _PID_MAP(CDC, 0) | _PID_MAP(MSC, 1) | _PID_MAP(HID, 2) | \
+ _PID_MAP(MIDI, 3) | _PID_MAP(VENDOR, 4) )
+
+//--------------------------------------------------------------------+
+// Device Descriptors
+//--------------------------------------------------------------------+
+tusb_desc_device_t const desc_device =
+{
+ .bLength = sizeof(tusb_desc_device_t),
+ .bDescriptorType = TUSB_DESC_DEVICE,
+ .bcdUSB = 0x0200,
+
+ // Use Interface Association Descriptor (IAD) for CDC
+ // As required by USB Specs IAD's subclass must be common class (2) and protocol must be IAD (1)
+ .bDeviceClass = TUSB_CLASS_MISC,
+ .bDeviceSubClass = MISC_SUBCLASS_COMMON,
+ .bDeviceProtocol = MISC_PROTOCOL_IAD,
+
+ .bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE,
+
+ .idVendor = 0xCafe,
+ .idProduct = USB_PID,
+ .bcdDevice = 0x0100,
+
+ .iManufacturer = 0x01,
+ .iProduct = 0x02,
+ .iSerialNumber = 0x03,
+
+ .bNumConfigurations = 0x01
+};
+
+// Invoked when received GET DEVICE DESCRIPTOR
+// Application return pointer to descriptor
+uint8_t const * tud_descriptor_device_cb(void) {
+ return (uint8_t const *) &desc_device;
+}
+
+//--------------------------------------------------------------------+
+// Configuration Descriptor
+//--------------------------------------------------------------------+
+
+enum {
+ ITF_NUM_CDC = 0,
+ ITF_NUM_CDC_DATA,
+ ITF_NUM_TOTAL
+};
+
+#define CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN)
+
+#define EPNUM_CDC_NOTIF 0x81
+#define EPNUM_CDC_OUT 0x02
+#define EPNUM_CDC_IN 0x82
+
+
+uint8_t const desc_fs_configuration[] = {
+ // Config number, interface count, string index, total length, attribute, power in mA
+ TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),
+
+ // Interface number, string index, EP notification address and size, EP data address (out, in) and size.
+ TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 4, EPNUM_CDC_NOTIF, 8, EPNUM_CDC_OUT, EPNUM_CDC_IN, 64),
+};
+
+// Invoked when received GET CONFIGURATION DESCRIPTOR
+// Application return pointer to descriptor
+// Descriptor contents must exist long enough for transfer to complete
+uint8_t const * tud_descriptor_configuration_cb(uint8_t index) {
+ (void) index; // for multiple configurations
+ return desc_fs_configuration;
+}
+
+//--------------------------------------------------------------------+
+// String Descriptors
+//--------------------------------------------------------------------+
+
+// array of pointer to string descriptors
+char const* string_desc_arr [] =
+{
+ (const char[]) { 0x09, 0x04 }, // 0: is supported language is English (0x0409)
+ "TinyUSB", // 1: Manufacturer
+ "TinyUSB Device", // 2: Product
+ "123456", // 3: Serials, should use chip ID
+ "TinyUSB CDC", // 4: CDC Interface
+};
+
+static uint16_t _desc_str[32];
+
+// Invoked when received GET STRING DESCRIPTOR request
+// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete
+uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid)
+{
+ (void) langid;
+
+ uint8_t chr_count;
+
+ if ( index == 0) {
+ memcpy(&_desc_str[1], string_desc_arr[0], 2);
+ chr_count = 1;
+ } else {
+ // Note: the 0xEE index string is a Microsoft OS 1.0 Descriptors.
+ // https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/microsoft-defined-usb-descriptors
+
+ if ( !(index < sizeof(string_desc_arr)/sizeof(string_desc_arr[0])) ) return NULL;
+
+ const char* str = string_desc_arr[index];
+
+ // Cap at max char
+ chr_count = strlen(str);
+ if ( chr_count > 31 ) chr_count = 31;
+
+ // Convert ASCII string into UTF-16
+ for(uint8_t i=0; i<chr_count; i++)
+ {
+ _desc_str[1+i] = str[i];
+ }
+ }
+
+ // first byte is length (including header), second byte is string type
+ _desc_str[0] = (TUSB_DESC_STRING << 8 ) | (2*chr_count + 2);
+
+ return _desc_str;
+}