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add firmware

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King Kévin 2024-05-28 23:31:32 +02:00
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*.bin
*.hex
*.elf
*.ld
*.o
*.d
*.bak

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[submodule "libopencm3"]
path = libopencm3
url = https://github.com/libopencm3/libopencm3

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GNU GENERAL PUBLIC LICENSE
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<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

42
firmware/Makefile Normal file
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DEVICE = stm32f030c8t6
OPENCM3_DIR =./libopencm3
OBJS += main.o
CFLAGS += -Os -ggdb3 -specs=nosys.specs
CPPFLAGS += -MD
LDFLAGS += -static -nostartfiles -specs=nosys.specs
LDLIBS += -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
OOCD ?= openocd
OOCD_INTERFACE ?= cmsis-dap
OOCD_TARGET ?= stm32f0x
include $(OPENCM3_DIR)/mk/genlink-config.mk
include $(OPENCM3_DIR)/mk/gcc-config.mk
.PHONY: clean all
all: binary.elf binary.hex
clean:
$(Q)$(RM) -rf binary.* *.o
bl: binary.hex
stm32flash -w $< -v /dev/ttyACM0
flash: binary.elf
$(OOCD) -f interface/$(OOCD_INTERFACE).cfg \
-f target/$(OOCD_TARGET).cfg \
-c "program $< verify reset exit"
debug: binary.elf
$(GDB) --eval-command='target remote | $(OOCD) --file interface/$(OOCD_INTERFACE).cfg --command "transport select swd" --file target/$(OOCD_TARGET).cfg --command "gdb_port pipe; log_output /dev/null; init"' $<
include $(OPENCM3_DIR)/mk/genlink-rules.mk
include $(OPENCM3_DIR)/mk/gcc-rules.mk
$(OPENCM3_DIR)/lib/lib$(LIBNAME).a:
ifeq (,$(wildcard $@))
$(warning $(LIBNAME).a not found, attempting to rebuild in $(OPENCM3_DIR))
$(MAKE) -C $(OPENCM3_DIR)
endif

745
firmware/main.c Normal file
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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright 2024 King Kévin <kingkevin@cuvoodoo.info>
*/
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/usart.h>
#include <libopencm3/stm32/timer.h>
#include <libopencm3/stm32/adc.h> // ADC utilities
#include <libopencm3/cm3/nvic.h>
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
// get the length of an array
#define LENGTH(x) (sizeof(x) / sizeof((x)[0]))
// print debug messages
#define DEBUG (false)
// duration to wait for pull-up/down (in cycles)
#define PULL_DURATION (100U)
enum io_name {
// inputs
GNDA, // on host side, pulled high
GNDC, // on host side, pulled high
VBUSB, // on device side, pulled low
VBUSC, // on device side, pulled low
HDM, // pulled high when no wire, pulled low when wire
HDP, // pulled low when no wire, high when wire
DDM, // pulled low when not shorted, high when shorted
SSP, // 3V3 on A when SS wires present, sources LED, not pulled
SSM, // GND on A when SS wires present, sinks LED, not pulled
SS1, // GND on C when SS wires present, sinks LED, not pulled
SS2, // GND on C when SS wires present, sinks LED, not pulled
HCC1, // pulled high
HCC2, // pulled high
DCC1, // pull high when CC wire present, weakly pulled low
DCC2, // pull high when CC wire present, weakly pulled low
SBU, // GND on C when SBU wires present, sinks LED, not pulled
HSH, // GND when host-C present, pulled high
DSH, // GND when device-C present, sinks LED, no pulled
BSH, // pull high when *-B shield present, weakly pulled low (to cable ground)
// button input
BUTTON,
// outputs
LEDX,
LEDY,
LEDZ,
LED1,
LED2,
LED3,
LED4,
IO_MAX
};
static const uint32_t io_port[IO_MAX] = {
[GNDA] = GPIOC,
[GNDC] = GPIOC,
[VBUSB] = GPIOB,
[VBUSC] = GPIOB,
[HDM] = GPIOF,
[HDP] = GPIOF,
[DDM] = GPIOC,
[SSP] = GPIOB,
[SSM] = GPIOB,
[SS1] = GPIOB,
[SS2] = GPIOB,
[HCC1] = GPIOA,
[HCC2] = GPIOA,
[DCC1] = GPIOA,
[DCC2] = GPIOA,
[SBU] = GPIOB,
[HSH] = GPIOA,
[DSH] = GPIOA,
[BSH] = GPIOA,
[BUTTON] = GPIOB,
[LEDX] = GPIOB,
[LEDY] = GPIOB,
[LEDZ] = GPIOB,
[LED1] = GPIOB,
[LED2] = GPIOB,
[LED3] = GPIOB,
[LED4] = GPIOB,
};
static const uint16_t io_pin[IO_MAX] = {
[GNDA] = GPIO13,
[GNDC] = GPIO14,
[VBUSB] = GPIO8,
[VBUSC] = GPIO9,
[HDM] = GPIO1,
[HDP] = GPIO0,
[DDM] = GPIO15,
[SSP] = GPIO0,
[SSM] = GPIO1,
[SS1] = GPIO2,
[SS2] = GPIO10,
[HCC1] = GPIO3,
[HCC2] = GPIO4,
[DCC1] = GPIO2,
[DCC2] = GPIO1,
[SBU] = GPIO11,
[HSH] = GPIO7,
[DSH] = GPIO6,
[BSH] = GPIO5,
[BUTTON] = GPIO7,
[LEDX] = GPIO5,
[LEDY] = GPIO4,
[LEDZ] = GPIO3,
[LED1] = GPIO12,
[LED2] = GPIO13,
[LED3] = GPIO14,
[LED4] = GPIO15,
};
// if we should do a pull test
// the capability tests use current to power LEDs, we need to check using voltage
static const uint16_t io_pull[BUTTON] = {
[GNDA] = false,
[GNDC] = false,
[VBUSB] = false,
[VBUSC] = false,
[HDM] = false,
[HDP] = false,
[DDM] = false,
[SSP] = true, // capability current test
[SSM] = true, // capability current test
[SS1] = true, // capability current test
[SS2] = true, // capability current test
[HCC1] = false,
[HCC2] = false,
[DCC1] = false,
[DCC2] = false,
[SBU] = true, // capability current test
[HSH] = false,
[DSH] = true, // capability current test
[BSH] = false,
// LEDs are not pulls
};
static bool io_pn[BUTTON] = {false}; // if up when not pulled
static bool io_pu[BUTTON] = {false}; // if up when pulled up
static bool io_pd[BUTTON] = {false}; // if up when pulled down
uint16_t ledx = 0; // which LEDs to set on row X
uint16_t ledy = 0; // which LEDs to set on row Y
uint16_t ledz = 0; // which LEDs to set on row Z
// voltages to convert
const uint8_t channels[] = { // must be ordered by number
0, // VCC, PA0, ADC_IN0
1, // DCC2, PA1, ADC_IN1
2, // DCC1, PA2, ADC_IN2
3, // HCC1, PA3, ADC_IN3
4, // HCC2, PA4, ADC_IN4
ADC_CHANNEL_VREF, // internal voltage reference
};
enum fault {
FAULT_VBUS_NOT_GND,
FAULT_GND_NOT_VBUS,
FAULT_DM_CONNECT,
FAULT_HOST_DATA_PULLED,
FAULT_DATA_NOT_GND,
FAULT_DATA_NOT_VBUS,
FAULT_SS_NOT_GND,
FAULT_SS_NOT_VBUS,
FAULT_SS_NOT_SHIELD,
FAULT_SS_NOT_DATA,
FAULT_GND_DRAIN,
FAULT_CC_NOT_DC,
FAULT_DC_NOT_CCRP,
FAULT_CC_NOT_CC,
FAULT_SBU_NOT_HC,
FAULT_SBU_NOT_DC,
FAULT_RA_NOT_HA,
FAULT_RA_NOT_DC,
FAULT_AC_NOT_RP,
FAULT_RP_NOT_AC,
FAULT_RD_NOT_DB,
FAULT_MAX
};
static const char* faults[FAULT_MAX] = {
[FAULT_VBUS_NOT_GND] = "VBUS present, but GND missing",
[FAULT_GND_NOT_VBUS] = "GND present, but VBUS missing",
[FAULT_DM_CONNECT] = "host and device D- not inter-connected",
[FAULT_HOST_DATA_PULLED] = "host data lines are not floating",
[FAULT_DATA_NOT_GND] = "data lines present, but GND missing",
[FAULT_DATA_NOT_VBUS] = "data lines present, but VBUS missing",
[FAULT_SS_NOT_GND] = "SuperSpeed data lines present, but GND missing",
[FAULT_SS_NOT_VBUS] = "SuperSpeed data lines present, but VBUS missing",
[FAULT_SS_NOT_SHIELD] = "SuperSpeed data lines present, but shield missing",
[FAULT_SS_NOT_DATA] = "SuperSpeed data lines present, but USB 2.0 data lines missing",
[FAULT_GND_DRAIN] = "GND_DRAIN not connected to ground",
[FAULT_CC_NOT_DC] = "Rp/CC line present, but device C missing",
[FAULT_DC_NOT_CCRP] = "device C present, but Rp/CC line missing",
[FAULT_CC_NOT_CC] = "C-C cable, but CC line missing",
[FAULT_SBU_NOT_HC] = "SBU present, but host C missing",
[FAULT_SBU_NOT_DC] = "SBU present, but device C missing",
[FAULT_RA_NOT_HA] = "Ra detected, but host A missing",
[FAULT_RA_NOT_DC] = "Ra detected, but device C missing",
[FAULT_AC_NOT_RP] = "A-C cable, but Rp missing",
[FAULT_RP_NOT_AC] = "Rp detected, but not A-C cable",
[FAULT_RD_NOT_DB] = "Rd detected, but not C-microB cable",
};
enum cc_rx {
R_UNKNOWN, // everything else
R_OPEN, // pulled by board, no resistor in cable, no CC wire
R_5K1, // pulled by board, no resistor in cable, CC wire
RA_1K, // Ra in cable to indicate eMarker
RD_5K1, // 5.1k pull down Rd resistor in host C to indicate device
RP_56K, // 56k pull up Rp resistor in device C to indicate host current capable of 0.5-0.8A
RP_22K, // 22k pull up Rp resistor in device C to indicate host current capable of 1.5A
RP_10K, // 10k pull up Rp resistor in device C to indicate host current capable of 3.0A
R_MAX,
};
static const char* cc_rx_str[R_MAX] = {
[R_UNKNOWN] = "?",
[R_OPEN] = "open",
[R_5K1] = "C-C",
[RA_1K] = "Ra",
[RD_5K1] = "Rd",
[RP_56K] = "Rp 56k",
[RP_22K] = "Rp 22k",
[RP_10K] = "Rp 10k",
};
// measured and set by meas_rx
static enum cc_rx cc_r[4]; // HCC1, HCC2, DCC1, DCC2
__attribute__((weak)) int _read(int file, char *ptr, int len){ return -1; }
int _close(int file){ return -1; }
int _fstat(int file, struct stat *st){ st->st_mode = S_IFCHR; return 0; }
int _isatty(int file){ return 1; }
int _lseek(int file, int ptr, int dir){ return 0; }
int _getpid(){ return -1; }
int _kill(int pid, int sig){ return -1; }
int _write(int file, char *ptr, int len)
{
int i;
if (file == 1) {
for (i = 0; i < len; i++)
usart_send_blocking(USART1, ptr[i]);
return i;
}
errno = EIO;
return -1;
}
static void usart_setup(void)
{
// enable clocks for USART
rcc_periph_clock_enable(RCC_USART1);
// setup GPIO pins for USART transmit
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
// setup USART TX pin as alternate function
gpio_set_af(GPIOA, GPIO_AF1, GPIO9);
// setup USART parameters
usart_set_baudrate(USART1, 115200);
usart_set_databits(USART1, 8);
usart_set_parity(USART1, USART_PARITY_NONE);
usart_set_stopbits(USART1, USART_CR2_STOPBITS_1);
usart_set_mode(USART1, USART_MODE_TX);
usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
usart_enable(USART1);
}
static void gpio_setup(void)
{
// enable GPIO clock for inputs and LEDs
rcc_periph_clock_enable(RCC_GPIOA);
rcc_periph_clock_enable(RCC_GPIOB);
rcc_periph_clock_enable(RCC_GPIOC);
rcc_periph_clock_enable(RCC_GPIOF);
// ADC to measure Rp
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO0); // Vcc analog input
rcc_periph_clock_enable(RCC_ADC1); // enable clock for ADC domain
adc_power_off(ADC1); // switch off ADC while configuring it
adc_set_clk_source(ADC1, ADC_CLKSOURCE_ADC);
adc_set_right_aligned(ADC1); // ensure it is right aligned to get the actual value in the 16-bit register
adc_disable_external_trigger_regular(ADC1);
adc_enable_vrefint(); // enable internal voltage reference
adc_set_operation_mode(ADC1, ADC_MODE_SCAN); // use scan mode do be able to go to next discontinuous subgroup of the regular sequence
adc_enable_discontinuous_mode(ADC1); // use discontinuous mode (to go through all channels of the group, one after another)
adc_set_single_conversion_mode(ADC1); // ensure continuous mode is not used (that's not the same as discontinuous)
adc_set_sample_time_on_all_channels(ADC1, ADC_SMPTIME_071DOT5);
adc_set_regular_sequence(ADC1, LENGTH(channels), (uint8_t*)channels); // set channel to convert
adc_set_resolution(ADC1, ADC_RESOLUTION_12BIT);
adc_disable_analog_watchdog(ADC1);
adc_calibrate(ADC1);
adc_power_on(ADC1); // switch on ADC
// setup GPIO pin for inputs
for (uint8_t i = 0; i < LEDX; i++) {
gpio_mode_setup(io_port[i], GPIO_MODE_INPUT, GPIO_PUPD_NONE, io_pin[i]);
}
// setup GPIO pin for LEDs
for (uint8_t i = LEDX; i < IO_MAX; i++) {
gpio_clear(io_port[i], io_pin[i]); // switch off LED
gpio_mode_setup(io_port[i], GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, io_pin[i]); // set as output
}
// test LEDs
gpio_clear(io_port[LEDX], io_pin[LEDX] | io_pin[LEDY] | io_pin[LEDZ]); // disable all rows
gpio_clear(io_port[LED1], io_pin[LED1] | io_pin[LED2] | io_pin[LED3] | io_pin[LED4]); // enable all columns
gpio_set(io_port[LEDX], io_pin[LEDX]); // enable first row
for (volatile uint32_t i = 0; i < 20000; i++);
gpio_clear(io_port[LEDX], io_pin[LEDX]); // disable first row
gpio_set(io_port[LEDY], io_pin[LEDY]); // enable second row
for (volatile uint32_t i = 0; i < 20000; i++);
gpio_clear(io_port[LEDY], io_pin[LEDY]); // disable second row
gpio_set(io_port[LEDZ], io_pin[LEDZ]); // enable second row
for (volatile uint32_t i = 0; i < 20000; i++);
gpio_clear(io_port[LEDZ], io_pin[LEDZ]); // disable third row
}
static void timer_setup(void)
{
// enable timer for LED matrix
rcc_periph_clock_enable(RCC_TIM14); // enable clock for timer peripheral
rcc_periph_reset_pulse(RST_TIM14); // reset timer state
timer_set_mode(TIM14, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP); // set timer mode, use undivided timer clock,edge alignment (simple count), and count up
timer_set_prescaler(TIM14, 1); // set lowest speed to not flicker
timer_set_period(TIM14, 15000); // hand tuned
timer_clear_flag(TIM14, TIM_SR_UIF); // clear flag
timer_update_on_overflow(TIM14); // only use counter overflow as UEV source
timer_enable_irq(TIM14, TIM_DIER_UIE); // enable update interrupt for timer
nvic_enable_irq(NVIC_TIM14_IRQ); // catch interrupt in service routine
timer_enable_counter(TIM14); // enable timer
}
static void pull_test(void)
{
// pull on pins
for (uint8_t i = 0; i < LENGTH(io_pull); i++) {
io_pn[i] = gpio_get(io_port[i], io_pin[i]); // check state
if (io_pull[i]) {
gpio_mode_setup(io_port[i], GPIO_MODE_INPUT, GPIO_PUPD_PULLDOWN, io_pin[i]); // pull down
}
}
for (volatile uint32_t i = 0; i < PULL_DURATION; i++); // wait a tiny bit for the pull to take effect
for (uint8_t i = 0; i < LENGTH(io_pull); i++) {
if (io_pull[i]) {
io_pd[i] = gpio_get(io_port[i], io_pin[i]); // check if pulled down
gpio_mode_setup(io_port[i], GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, io_pin[i]); // pull up
}
}
for (volatile uint32_t i = 0; i < PULL_DURATION; i++); // wait a tiny bit for the pull to take effect
for (uint8_t i = 0; i < LENGTH(io_pull); i++) {
if (io_pull[i]) {
io_pu[i] = gpio_get(io_port[i], io_pin[i]); // check if pulled up
gpio_mode_setup(io_port[i], GPIO_MODE_INPUT, GPIO_PUPD_NONE, io_pin[i]); // release pull
}
}
}
static void meas_rx(void)
{
// switch to ADC to measure
gpio_mode_setup(io_port[HCC1], GPIO_MODE_ANALOG, GPIO_PUPD_NONE, io_pin[HCC1]);
gpio_mode_setup(io_port[HCC2], GPIO_MODE_ANALOG, GPIO_PUPD_NONE, io_pin[HCC2]);
gpio_mode_setup(io_port[DCC1], GPIO_MODE_ANALOG, GPIO_PUPD_NONE, io_pin[DCC1]);
gpio_mode_setup(io_port[DCC2], GPIO_MODE_ANALOG, GPIO_PUPD_NONE, io_pin[DCC2]);
uint16_t adc_values[LENGTH(channels)];
for (uint8_t i = 0; i < LENGTH(channels); i++) {
adc_start_conversion_regular(ADC1); // start conversion (using trigger)
while (!adc_eoc(ADC1)); // wait until conversion finished
adc_values[i] = adc_read_regular(ADC1); // read voltage value (clears flag)
}
uint16_t voltages[LENGTH(channels)]; // in mV
for (uint8_t i = 0; i < LENGTH(channels); i++) { // new loop since we need last value
voltages[i] = (adc_values[i] * 1230) / adc_values[LENGTH(channels) - 1]; // use 1.23 V internal voltage reference to get ADC voltage
}
// HCC1 and HCC2 are pulled up using 5.1k on board. Ra, Rd, or resistor on DCC1 and DCC2 can pull it down
float resistances[4]; // in kOhm: HCC1, HCC2, DCC1, DCC2
// in a voltage divider r2 = r1 / (vin / vout - 1)
// resistance pulling down HCC1 (vout on HCC1 = voltages[3])
if (voltages[3] >= voltages[0]) { // not pulled down
resistances[0] = -1;
} else if (0 == voltages[3]) { // set low
resistances[0] = 0;
} else { // pulled down by R2
resistances[0] = 5.1 / (voltages[0] * 1.0 / voltages[3] - 1);
}
// resistance pulling down HCC2 (vout on HCC2 = voltages[4])
if (voltages[4] >= voltages[0]) { // not pulled down
resistances[1] = -1;
} else if (0 == voltages[4]) { // set low
resistances[1] = 0;
} else { // pulled down by R2
resistances[1] = 5.1 / (voltages[0] * 1.0 / voltages[4] - 1);
}
// DCC1 and DCC2 are pulled down using 470k on the board. Rp or resistor on HCC1 and HCC2 can pull it up
// in a voltage divider r1 = r2 * (vin/vout -1 )
// resistance pulling up DCC1 (vout on DCC1 = voltages[2])
if (voltages[2] >= voltages[0]) { // set high
resistances[2] = 0;
} else if (0 == voltages[4]) { // not pulled up
resistances[2] = -1;
} else { // pulled up by R1
resistances[2] = 470.0 * (voltages[0] * 1.0 / voltages[2] - 1);
}
// resistance pulling up DCC2 (vout on DCC2 = voltages[1])
if (voltages[1] >= voltages[0]) { // set high
resistances[3] = 0;
} else if (0 == voltages[1]) { // not pulled up
resistances[3] = -1;
} else { // pulled up by R1
resistances[3] = 470.0 * (voltages[0] * 1.0 / voltages[1] - 1);
}
// classify resistor
const float tolerance = 0.4;
// HCC1
if (resistances[0] > 100.0) {
cc_r[0] = R_OPEN;
} else if (resistances[0] < 1.0 * (1.0 + tolerance)) {
cc_r[0] = RA_1K;
} else if (resistances[0] > (5.1 * (1.0 - tolerance)) && resistances[0] < (5.1 * (1.0 + tolerance))) {
cc_r[0] = RD_5K1;
} else {
cc_r[0] = R_UNKNOWN;
}
// HCC2
if (resistances[1] > 100.0) {
cc_r[1] = R_OPEN;
} else if (resistances[1] < 1.0 * (1.0 + tolerance)) {
cc_r[1] = RA_1K;
} else if (resistances[1] > (5.1 * (1.0 - tolerance)) && resistances[1] < (5.1 * (1.0 + tolerance))) {
cc_r[1] = RD_5K1;
} else {
cc_r[1] = R_UNKNOWN;
}
// DCC1
if (resistances[2] > 500.0 || resistances[2] < 0.0) {
cc_r[2] = R_OPEN;
} else if (resistances[2] < (5.1 * (1.0 + tolerance))) {
cc_r[2] = R_5K1;
} else if (resistances[2] > (56.0 * (1.0 - tolerance)) && resistances[2] < (56.0 * (1.0 + tolerance))) {
cc_r[2] = RP_56K;
} else if (resistances[2] > (22.0 * (1.0 - tolerance)) && resistances[2] < (22.0 * (1.0 + tolerance))) {
cc_r[2] = RP_22K;
} else if (resistances[2] > (10.0 * (1.0 - tolerance)) && resistances[2] < (10.0 * (1.0 + tolerance))) {
cc_r[2] = RP_10K;
} else {
cc_r[2] = R_UNKNOWN;
}
// DCC2
if (resistances[3] > 500.0 || resistances[3] < 0.0) {
cc_r[3] = R_OPEN;
} else if (resistances[3] < (5.1 * (1.0 + tolerance))) {
cc_r[3] = R_5K1;
} else if (resistances[3] > (56.0 * (1.0 - tolerance)) && resistances[3] < (56.0 * (1.0 + tolerance))) {
cc_r[3] = RP_56K;
} else if (resistances[3] > (22.0 * (1.0 - tolerance)) && resistances[3] < (22.0 * (1.0 + tolerance))) {
cc_r[3] = RP_22K;
} else if (resistances[3] > (10.0 * (1.0 - tolerance)) && resistances[3] < (10.0 * (1.0 + tolerance))) {
cc_r[3] = RP_10K;
} else {
cc_r[3] = R_UNKNOWN;
}
if (DEBUG) {
printf("voltages:\r\n");
printf("- VCC: %u mV\r\n", voltages[0]);
printf("- HCC1: %u mV\r\n", voltages[3]);
printf("- HCC2: %u mV\r\n", voltages[4]);
printf("- DCC1: %u mV\r\n", voltages[2]);
printf("- DCC2: %u mV\r\n", voltages[1]);
printf("resistances:\r\n");
printf("- HCC1 (Ra/Rd): %.02f kOhm\r\n", resistances[0]);
printf("- HCC2 (Ra/Rd): %.02f kOhm\r\n", resistances[1]);
printf("- DCC1 (Rp): %.02f kOhm\r\n", resistances[2]);
printf("- DCC2 (Rp): %.02f kOhm\r\n", resistances[3]);
printf("resistors:\r\n");
printf("- HCC1 (Ra/Rd): %s\r\n", cc_rx_str[cc_r[0]]);
printf("- HCC2 (Ra/Rd): %s\r\n", cc_rx_str[cc_r[1]]);
printf("- DCC1 (Rp): %s\r\n", cc_rx_str[cc_r[2]]);
printf("- DCC2 (Rp): %s\r\n", cc_rx_str[cc_r[3]]);
}
// go back to input for simple scanning
gpio_mode_setup(io_port[HCC1], GPIO_MODE_INPUT, GPIO_PUPD_NONE, io_pin[HCC1]);
gpio_mode_setup(io_port[HCC2], GPIO_MODE_INPUT, GPIO_PUPD_NONE, io_pin[HCC2]);
gpio_mode_setup(io_port[DCC1], GPIO_MODE_INPUT, GPIO_PUPD_NONE, io_pin[DCC1]);
gpio_mode_setup(io_port[DCC2], GPIO_MODE_INPUT, GPIO_PUPD_NONE, io_pin[DCC2]);
}
int main(void)
{
gpio_setup();
usart_setup();
timer_setup();
printf("\r\nUSB micro-B and C cable tester v1\r\n");
uint16_t loops = UINT16_MAX;
while (true) {
pull_test(); // refresh pull test
meas_rx(); // measure resistance (actually only required when CC/Rp/Ra detected, but it's quick enough to always do it)
// get cable capabilities
uint32_t fault = 0; // if a fault in the cable has been detected (ignore all other result then)
// check VBUS and ground
const bool host_a = !io_pn[GNDA];
const bool host_c = !io_pn[GNDC];
const bool device_b = io_pn[VBUSB];
const bool device_c = io_pn[VBUSC];
if ((device_b || device_c) && !(host_a || host_c)) {
fault |= (1 << FAULT_VBUS_NOT_GND);
}
if ((host_a || host_c) && !(device_b || device_c)) {
fault |= (1 << FAULT_GND_NOT_VBUS);
}
// check USB 2.0 data lines
const bool usb2 = !io_pn[HDM] && io_pn[HDP]; // host D- pulled low by device D-, and host D+ set high on device side
if (usb2 && io_pn[HDM] != io_pn[DDM]) { // host and device D- should be inter-connected and the same
fault |= (1 << FAULT_DM_CONNECT);
}
// check battery charge
const bool bc = io_pn[DDM]; // device D- set high by device D+ through internal short
if (bc && (!io_pn[HDM] || io_pn[HDP])) { // host data pins should be pulled by default
fault |= (1 << FAULT_HOST_DATA_PULLED);
}
if (bc && !(host_a || host_c)) {
fault |= (1 << FAULT_DATA_NOT_GND);
}
if (bc && !(device_b || device_c)) {
fault |= (1 << FAULT_DATA_NOT_VBUS);
}
// check shields
const bool shield_ab = (io_pn[HSH] && io_pn[BSH]); // A-microB shield present and not connected to GND
const bool shield_hc = !io_pn[HSH]; // host C shield connected to GND
const bool shield_dc = !io_pu[DSH]; // device C shield connected to GND
// check A-C SS wires
const bool ssa = (io_pd[SSP] && !io_pu[SSM]); // SS wire for data present, and GND_DRAIN connected to GND
if (io_pd[SSP] && io_pu[SSM] && !io_pd[SSM]) { // SS wire for data present, but GND_DRAIN not connected to GND
fault |= (1 << FAULT_GND_DRAIN);
}
if (!device_c && io_pd[SSP]) { // VBUS not present, but SS wire for data present
fault |= (1 << FAULT_SS_NOT_VBUS);
}
if (!device_c && !io_pu[SSM]) { // VBUS not present, but GND_DRAIN connected to GND
fault |= (1 << FAULT_SS_NOT_VBUS);
}
if (!host_a && io_pd[SSP]) { // GND not present, but SS wire for data present
fault |= (1 << FAULT_SS_NOT_GND);
}
if (!host_a && !io_pu[SSM]) { // GND not present, but GND_DRAIN connected to GND
fault |= (1 << FAULT_SS_NOT_GND);
}
if (ssa && !usb2) {
fault |= (1 << FAULT_SS_NOT_DATA);
}
// check C-C SS wires
const bool ss1 = !io_pu[SS1]; // SS wires connected to GND
const bool ss2 = !io_pu[SS2]; // SS wires connected to GND
if ((ss1 || ss2) && !device_c) { // VBUS not present, but SS wires connected
fault |= (1 << FAULT_DATA_NOT_VBUS);
}
if ((ss1 || ss2) && !host_c) { // GND not present, but SS wires connected
fault |= (1 << FAULT_DATA_NOT_GND);
}
if (usb2 && (ssa || ss1 || ss2) && !(shield_hc && shield_dc)) { // express, one lane
fault |= (1 << FAULT_SS_NOT_SHIELD); // shield missing
}
if (usb2 && ss1 && ss2 && !(shield_hc || shield_dc)) { // express, two lanes
fault |= (1 << FAULT_SS_NOT_SHIELD); // shield missing
}
if ((ss1 || ss2) && !usb2) {
fault |= (1 << FAULT_SS_NOT_DATA);
}
// check CC/Rp
const bool ccrp = (io_pn[DCC1] || io_pn[DCC2]); // CC wire or Rp present
if (device_c && !ccrp) { // C connected, but CC/Rp missing
fault |= (1 << FAULT_DC_NOT_CCRP);
}
const bool cc = ccrp && host_c && (R_OPEN != cc_r[2] || R_OPEN == cc_r[3]); //use resistor value to identify CC wire (normally it should be == R_5K1, but I saw up to 120k)
const bool rp = ccrp && host_a && ((RP_56K == cc_r[2]) || (RP_22K == cc_r[2]) || (RP_10K == cc_r[2]) || (RP_56K == cc_r[3]) || (RP_22K == cc_r[3]) || (RP_10K == cc_r[3]));
if (!device_c && cc) { // device C not connected but CC present
fault |= (1 << FAULT_CC_NOT_DC);
}
if (host_a && device_c && !rp) { // A-C cable connected but Rp missing
fault |= (1 << FAULT_AC_NOT_RP);
}
if (rp && (!host_a || !device_c)) { // Rp detected, but it's not an A-C cable
fault |= (1 << FAULT_RP_NOT_AC);
}
if (host_c && device_c && !cc) { // C-C cable, but no CC wire
fault |= (1 << FAULT_CC_NOT_CC);
}
// check SBU
const bool sbu = !io_pu[SBU]; // SBU connected to GND
if (sbu && !host_c) { // device C not connected but SBU present
fault |= (1 << FAULT_SBU_NOT_HC);
}
if (sbu && !device_c) { // device C not connected but SBU present
fault |= (1 << FAULT_SBU_NOT_DC);
}
// check Rd/Ra (eMarker indication)
const bool rard = (!io_pn[HCC1] || !io_pn[HCC2]); // one of the host CC lines is pulled down
const bool ra = rard && ((RA_1K == cc_r[0]) || (RA_1K == cc_r[1])); // use resistor value on host CC to identify Ra
if (ra && !device_c) { // Ra present but not x-C cable
fault |= (1 << FAULT_RA_NOT_DC);
}
const bool rd = rard && ((RD_5K1 == cc_r[0]) || (RD_5K1 == cc_r[1])); // use resistor value on host CC to identify Rd
if (rd && !device_b) { // Rp present but no C-microB cable
fault |= (1 << FAULT_RD_NOT_DB);
}
// determine usage
// cable type
if (fault) { // faulty
ledx = io_pin[LED4];
} else if (host_c && device_c && usb2 && ss1 && ss2 && cc && sbu && ra && shield_hc && shield_dc) { // full featured
ledx = io_pin[LED3];
} else if ((host_a || host_c) && (device_b || device_c) && usb2) { // data
ledx = io_pin[LED2];
} else if ((host_a || host_c) && (device_b || device_c)) { // charging
ledx = io_pin[LED1];
} else { // no cable present
ledx = 0;
}
// charging speed (show even if faulty)
if (host_c && device_c && usb2 && ss1 && ss2 && cc && sbu && ra && shield_hc && shield_dc) { // full featured could also be just 3A
ledy = io_pin[LED3] | io_pin[LED4];
} else if (host_c && device_c && cc && ra) { // express, 5.0A power delivery
ledy = io_pin[LED4];
} else if (host_c && device_c && cc) { // fast, 3.0A power delivery
ledy = io_pin[LED3];
} else if ((host_a || host_c) && (device_b || device_c) && bc) { // normal, battery charge
ledy = io_pin[LED2];
} else if ((host_a || host_c) && (device_b || device_c)) { // just power
ledy = io_pin[LED1];
} else { // no cable present
ledy = 0;
}
// data speed (show even if fault)
if (usb2 && ss1 && ss2 && shield_hc && shield_dc) { // express, two lanes
ledz = io_pin[LED4]; // missing shield is shown as fault
} else if (usb2 && (ssa || ss1 || ss2)) { // express, one lane
ledz = io_pin[LED3]; // missing shield is shown as fault
} else if (usb2 && (shield_ab || (shield_hc && shield_dc))) { // normal, USB 2.0 shielded
ledz = io_pin[LED2];
} else if (usb2) {
ledz = io_pin[LED1];
} else {
ledz = 0;
}
// show check results
if (loops >= 100 || DEBUG) {
loops = 0;
printf("cable capabilities:\r\n");
printf("- host type: %s\r\n", host_a ? "A" : (host_c ? "C" : "x"));
printf("- host type: %s\r\n", device_b ? "micro-B" : (device_c ? "C" : "x"));
printf("- D+/D- wires: %s\r\n", usb2 ? "present" : "absent");
printf("- D+/D- short: %s\r\n", bc ? "present" : "absent");
printf("- A-microB shield: %s\r\n", shield_ab ? "present" : "absent");
printf("- A-C SS wires: %s\r\n", ssa ? "present" : "absent");
printf("- A-C Rp: %s\r\n", rp ? ((RP_56K == cc_r[2] || RP_56K == cc_r[3]) ? "56k" : ((RP_22K == cc_r[2] || RP_22K == cc_r[3]) ? "22k" : ((RP_10K == cc_r[2] || RP_10K == cc_r[3]) ? "10k" : "???"))) : "absent");
printf("- C-C shield: %s\r\n", (shield_hc && shield_dc) ? "present" : "absent");
printf("- C-C SS1 wires: %s\r\n", ss1 ? "present" : "absent");
printf("- C-C SS2 wires: %s\r\n", ss2 ? "present" : "absent");
printf("- C-C CC wire: %s\r\n", cc ? "present" : "absent");
printf("- C-C SBU wires: %s\r\n", sbu ? "present" : "absent");
printf("- C-C Ra: %s\r\n", ra ? "present" : "absent");
printf("- C-microB Rd: %s\r\n", rd ? "present" : "absent");
printf("faults: %u\r\n", __builtin_popcount(fault));
if (fault) {
for (uint8_t b = 0; b < FAULT_MAX; b++) {
if (fault & (1 << b)) {
printf("- %s\r\n", faults[b]);
}
}
}
}
for (volatile uint32_t i = 0; i < 10000; i++); // wait before next tests
loops++;
if (DEBUG) {
for (volatile uint32_t i = 0; i < 1000000; i++); // slow down
}
}
return 0;
}
// interrupt service routine called for timer
// used for LED matrix to display cable usage
void tim14_isr(void)
{
if (timer_get_flag(TIM14, TIM_SR_UIF)) { // overflow update event happened
timer_clear_flag(TIM14, TIM_SR_UIF); // clear flag
static uint8_t led_row = 0;
// clear
gpio_clear(io_port[LEDX], io_pin[LEDX] | io_pin[LEDY] | io_pin[LEDZ]);
gpio_set(io_port[LED1], io_pin[LED1] | io_pin[LED2] | io_pin[LED3] | io_pin[LED4]);
// set
if (led_row > 2) {
led_row = 0;
}
switch (led_row) {
case 0:
gpio_set(io_port[LEDX], io_pin[LEDX]);
gpio_clear(io_port[LED1], ledx);
break;
case 1:
gpio_set(io_port[LEDY], io_pin[LEDY]);
gpio_clear(io_port[LED1], ledy);
break;
case 2:
gpio_set(io_port[LEDZ], io_pin[LEDZ]);
gpio_clear(io_port[LED1], ledz);
break;
default:
led_row = 0;
}
led_row++; // got to next row
}
}