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f9aab53e16
This application uses `soft_uart` to bit-bang the name of a number of configured GPIO pins via said pins at 9600 Bd. This way attaching an USB UART bridge to one pin at a time easily reveals which MCU GPIO pin a given pin on a board corresponds to. This is useful when no schematic and no silkscreen labeling is available, or when the information is misleading or outright incorrect (looking at the E180-ZG120B-TB).
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/*
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* Copyright (C) 2024 Marian Buschsieweke
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup tests
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* @defgroup tests_periph_uart_locate_pins
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* @{
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*
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* @file
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* @brief Test application to figure out pin mapping via UART
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*
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* @author Marian Buschsieweke <marian.buschsieweke@posteo.net>
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*
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* @}
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*/
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#include <stdint.h>
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#include "container.h"
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#include "fmt.h"
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#include "macros/units.h"
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#include "periph/gpio.h"
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#include "periph/timer.h"
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#include "soft_uart.h"
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#ifndef UART_SYMBOL_RATE
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# define UART_SYMBOL_RATE 9600
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#endif
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/* Adapt this list of pins to detect as needed. You may want to not use all
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* pins, e.g. pins connected to crystals, etc. may not react friendly to be
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* used as output */
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static const struct {
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uint8_t port_num;
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uint8_t pin_num;
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} pins[] = {
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{
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.port_num = 0,
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.pin_num = 0,
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},
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};
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soft_uart_conf_t soft_uart_config[] = {
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{
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.tx_pin = GPIO_UNDEF,
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.rx_pin = GPIO_UNDEF,
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.tx_timer = TIMER_DEV(0),
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.timer_freq = MHZ(1),
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},
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};
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int main(void)
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{
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while (1) {
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for (unsigned i = 0; i < ARRAY_SIZE(pins); i++) {
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gpio_t pin = GPIO_PIN(pins[i].port_num, pins[i].pin_num);
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soft_uart_config[0].tx_pin = pin;
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soft_uart_init(0, UART_SYMBOL_RATE, NULL, NULL);
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static char buf[32];
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char *pos = buf;
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*pos++ = 'P';
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pos += fmt_u16_dec(pos, pins[i].port_num);
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*pos++ = '.';
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pos += fmt_u16_dec(pos, pins[i].pin_num);
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*pos++ = ' ';
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*pos++ = '/';
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*pos++ = ' ';
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*pos++ = 'P';
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*pos++ = (char)((int)'A' + (int)pins[i].port_num);
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pos += fmt_u16_dec(pos, pins[i].pin_num);
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*pos++ = '\n';
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soft_uart_write(0, (void *)buf, (size_t)pos - (size_t)buf);
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soft_uart_poweroff(0);
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}
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}
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return 0;
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}
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