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application: add USB-C ressitor using FUSB302 to in Cplug action

This commit is contained in:
King Kévin 2020-02-28 17:14:28 +01:00
parent 93af648943
commit 4d8f1d537a
1 changed files with 44 additions and 0 deletions
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44
application.c
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@ -48,6 +48,7 @@
#include "usb_cables.h" // USB cables definition
#include "lcd_hd44780.h" // LCD utilities
#include "oled_text.h" // OLED utilities to display text
#include "usb_fusb302.h" // USB-C controller utilities
/** watchdog period in ms */
#define WATCHDOG_PERIOD 10000
@ -74,6 +75,9 @@ volatile bool rtc_internal_tick_flag = false; /**< flag set when internal RTC ti
/** activity timeout before switching off (in RTC ticks) */
#define SHUTDOWN_TIMEOUT (60 * RTC_TICKS_SECOND)
/** if a FUSB302 USB-C controller is present */
static bool present_fusb302 = false;
// ====================
// = common functions =
// ====================
@ -1340,6 +1344,36 @@ static void command_cplug(void* argument)
if (cc1 || cc2) {
puts("> this cable is to be connected to a source on the other end (A plug)\n");
}
// find out if a resistor is present using USB-C controller
if (present_fusb302 && USB_CONNECTOR_C_DEVICE == connectors[connector_id]) { // HW v1 (modified for a v2 prototype) has only a FUSB302 on the C device port
// ground pins need to be pulled low for the resistor test to work
usb_cables_pins_float(); // start with all floating to remove interferences
for (uint8_t i = 0; i < connector->pins_nb; i++) {
if (connector->pins[i] >= LENGTH(usb_pins)) {
continue;
}
const struct usb_pin_t pin = usb_pins[connector->pins[i]];
if (USB_PIN_TYPE_GROUND != pin.type) {
continue;
}
gpio_clear(pin.port, pin.pin);
gpio_set_mode(pin.port, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, pin.pin);
}
// figure out resistors on CC lines
for (uint8_t cc = 1; cc < 3; cc++) {
const char* r_values[] = {"short to ground", "Ra", "Rd", "Rp", "open"};
int16_t r = usb_fusb302_r(cc);
printf("- CC%u resistor: ", cc);
if (r < 0 || r >= (int16_t)LENGTH(r_values)) {
printf("error=%d", r);
} else {
puts(r_values[r]);
}
putc('\n');
}
// put ground back to floating
usb_cables_pins_float(); // not the most efficient way, but time is not critical
}
}
// test interconnection
@ -1719,6 +1753,16 @@ void main(void)
oled_text_clear();
oled_text_update();
// setup FUSB302 to remove all connections to CC pins (Rd enabled by default, also when unpowered)
// HW v1 has not been designed with a FUSB302 USB-C controller
// a FUSB302 has been added to it to test it in preparation of the v2
// since there wes no free pin to control its power, the LCD LED pin has been reused
lcd_hd44780_set_led(false); // provide power to the USB-C controller
present_fusb302 = (0 == usb_fusb302_setup());
if (!present_fusb302) {
lcd_hd44780_set_led(true);
}
// setup USB connectors
gpio_primary_remap(AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_ON, 0); // only use SWD and reuse JTAG pins
rcc_periph_clock_enable(RCC_GPIOA); // enable clock to all GPIO port domains since we use them all