f3d10dcc62
Slow down the detection of pull-up and pull-down resistors to make detection more reliable.
237 lines
6.7 KiB
C
237 lines
6.7 KiB
C
/*
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* Copyright 2022 Great Scott Gadgets <info@greatscottgadgets.com>
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*
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* This file is part of HackRF.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "platform_detect.h"
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#include "gpio_lpc.h"
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#include "hackrf_core.h"
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#include <libopencm3/lpc43xx/scu.h>
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#include <libopencm3/lpc43xx/adc.h>
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static board_id_t platform = BOARD_ID_UNDETECTED;
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static board_rev_t revision = BOARD_REV_UNDETECTED;
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static struct gpio_t gpio2_9_on_P5_0 = GPIO(2, 9);
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static struct gpio_t gpio3_6_on_P6_10 = GPIO(3, 6);
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#define P5_0_PUP (1 << 0)
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#define P5_0_PDN (1 << 1)
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#define P6_10_PUP (1 << 2)
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#define P6_10_PDN (1 << 3)
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/*
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* Jawbreaker has a pull-down on P6_10 and nothing on P5_0.
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* rad1o has a pull-down on P6_10 and a pull-down on P5_0.
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* HackRF One OG has a pull-down on P6_10 and a pull-up on P5_0.
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* HackRF One r9 has a pull-up on P6_10 and a pull-down on P5_0.
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*/
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#define JAWBREAKER_RESISTORS (P6_10_PDN)
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#define RAD1O_RESISTORS (P6_10_PDN | P5_0_PDN)
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#define HACKRF1_OG_RESISTORS (P6_10_PDN | P5_0_PUP)
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#define HACKRF1_R9_RESISTORS (P6_10_PUP | P5_0_PDN)
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/*
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* LEDs are configured so that they flash if the detected hardware platform is
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* not supported by the firmware binary. Only two LEDs are flashed for a
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* hardware detection failure, but three LEDs are flashed if CPLD configuration
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* fails.
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*/
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static struct gpio_t gpio_led1 = GPIO(2, 1);
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static struct gpio_t gpio_led2 = GPIO(2, 2);
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static struct gpio_t gpio_led3 = GPIO(2, 8);
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uint8_t adc_read(uint8_t pin)
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{
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pin &= 0x7;
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uint8_t pin_mask = (1 << pin);
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ADC0_CR = ADC_CR_SEL(pin_mask) | ADC_CR_CLKDIV(45) | ADC_CR_CLKS(2) | ADC_CR_PDN |
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ADC_CR_START(1);
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while (!(ADC0_GDR & ADC_DR_DONE) || (((ADC0_GDR >> 24) & 0x7) != pin)) {}
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return (ADC0_GDR >> 6) & 0x03FF;
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}
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void adc_off(void)
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{
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ADC0_CR = 0;
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}
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/*
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* Starting with r6, HackRF One has pin straps on ADC pins that indicate
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* hardware revision. Those pins were unconnected prior to r6, so we test for
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* the unconnected state by averaging several ADC readings.
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*/
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#define NUM_SAMPLES (10)
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#define LOW_THRESHOLD (2 * NUM_SAMPLES)
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#define HIGH_THRESHOLD (253 * NUM_SAMPLES)
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typedef enum {
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PIN_STRAP_HIGH,
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PIN_STRAP_LOW,
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PIN_STRAP_ABSENT,
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} pin_strap_t;
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pin_strap_t check_pin_strap(uint8_t pin)
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{
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int i;
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uint32_t sum = 0;
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for (i = 0; i < NUM_SAMPLES; i++) {
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sum += adc_read(pin);
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}
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adc_off();
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if (sum > HIGH_THRESHOLD) {
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return PIN_STRAP_HIGH;
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} else if (sum < LOW_THRESHOLD) {
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return PIN_STRAP_LOW;
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} else {
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return PIN_STRAP_ABSENT;
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}
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}
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void detect_hardware_platform(void)
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{
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uint8_t detected_resistors = 0;
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scu_pinmux(SCU_PINMUX_LED2, SCU_GPIO_NOPULL | SCU_CONF_FUNCTION0);
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scu_pinmux(SCU_PINMUX_LED3, SCU_GPIO_NOPULL | SCU_CONF_FUNCTION0);
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gpio_input(&gpio_led1);
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gpio_output(&gpio_led2);
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gpio_output(&gpio_led3);
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gpio_input(&gpio2_9_on_P5_0);
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gpio_input(&gpio3_6_on_P6_10);
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/* activate internal pull-down */
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scu_pinmux(P5_0, SCU_GPIO_PDN | SCU_CONF_FUNCTION0);
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scu_pinmux(P6_10, SCU_GPIO_PDN | SCU_CONF_FUNCTION0);
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delay_us_at_mhz(4, 96);
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/* tri-state for a moment before testing input */
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scu_pinmux(P5_0, SCU_GPIO_NOPULL | SCU_CONF_FUNCTION0);
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scu_pinmux(P6_10, SCU_GPIO_NOPULL | SCU_CONF_FUNCTION0);
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delay_us_at_mhz(4, 96);
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/* if input rose quickly, there must be an external pull-up */
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detected_resistors |= (gpio_read(&gpio2_9_on_P5_0)) ? P5_0_PUP : 0;
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detected_resistors |= (gpio_read(&gpio3_6_on_P6_10)) ? P6_10_PUP : 0;
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/* activate internal pull-up */
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scu_pinmux(P5_0, SCU_GPIO_PUP | SCU_CONF_FUNCTION0);
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scu_pinmux(P6_10, SCU_GPIO_PUP | SCU_CONF_FUNCTION0);
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delay_us_at_mhz(4, 96);
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/* tri-state for a moment before testing input */
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scu_pinmux(P5_0, SCU_GPIO_NOPULL | SCU_CONF_FUNCTION0);
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scu_pinmux(P6_10, SCU_GPIO_NOPULL | SCU_CONF_FUNCTION0);
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delay_us_at_mhz(4, 96);
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/* if input fell quickly, there must be an external pull-down */
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detected_resistors |= (gpio_read(&gpio2_9_on_P5_0)) ? 0 : P5_0_PDN;
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detected_resistors |= (gpio_read(&gpio3_6_on_P6_10)) ? 0 : P6_10_PDN;
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switch (detected_resistors) {
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case JAWBREAKER_RESISTORS:
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if (!(supported_platform() & PLATFORM_JAWBREAKER)) {
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halt_and_flash(3000000);
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}
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platform = BOARD_ID_JAWBREAKER;
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return;
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case RAD1O_RESISTORS:
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if (!(supported_platform() & PLATFORM_RAD1O)) {
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halt_and_flash(3000000);
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}
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platform = BOARD_ID_RAD1O;
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return;
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case HACKRF1_OG_RESISTORS:
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if (!(supported_platform() & PLATFORM_HACKRF1_OG)) {
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halt_and_flash(3000000);
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}
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platform = BOARD_ID_HACKRF1_OG;
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break;
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case HACKRF1_R9_RESISTORS:
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if (!(supported_platform() & PLATFORM_HACKRF1_R9)) {
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halt_and_flash(3000000);
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}
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platform = BOARD_ID_HACKRF1_R9;
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break;
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default:
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platform = BOARD_ID_UNRECOGNIZED;
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halt_and_flash(1000000);
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}
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pin_strap_t adc0_3 = check_pin_strap(3);
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pin_strap_t adc0_4 = check_pin_strap(4);
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pin_strap_t adc0_7 = check_pin_strap(7);
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if ((adc0_3 == PIN_STRAP_ABSENT) && (adc0_4 == PIN_STRAP_ABSENT) &&
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(adc0_7 == PIN_STRAP_ABSENT) && (platform == BOARD_ID_HACKRF1_OG)) {
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revision = BOARD_REV_HACKRF1_OLD;
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} else if (
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(adc0_3 == PIN_STRAP_HIGH) && (adc0_4 == PIN_STRAP_HIGH) &&
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(platform == BOARD_ID_HACKRF1_OG)) {
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revision = BOARD_REV_HACKRF1_R6;
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} else if (
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(adc0_3 == PIN_STRAP_LOW) && (adc0_4 == PIN_STRAP_HIGH) &&
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(platform == BOARD_ID_HACKRF1_OG)) {
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revision = BOARD_REV_HACKRF1_R7;
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} else if (
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(adc0_3 == PIN_STRAP_HIGH) && (adc0_4 == PIN_STRAP_LOW) &&
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(platform == BOARD_ID_HACKRF1_OG)) {
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revision = BOARD_REV_HACKRF1_R8;
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} else if (
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(adc0_3 == PIN_STRAP_LOW) && (adc0_4 == PIN_STRAP_LOW) &&
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(platform == BOARD_ID_HACKRF1_R9)) {
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revision = BOARD_REV_HACKRF1_R9;
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} else {
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revision = BOARD_REV_UNRECOGNIZED;
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}
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if ((revision > BOARD_REV_HACKRF1_OLD) && (adc0_7 == PIN_STRAP_LOW)) {
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revision |= BOARD_REV_GSG;
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}
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}
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board_id_t detected_platform(void)
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{
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return platform;
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}
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board_rev_t detected_revision(void)
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{
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return revision;
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}
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uint32_t supported_platform(void)
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{
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uint32_t binary_platform = 0;
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#ifdef JAWBREAKER
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binary_platform = PLATFORM_JAWBREAKER;
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#endif
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#ifdef HACKRF_ONE
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binary_platform = PLATFORM_HACKRF1_OG;
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#endif
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#ifdef RAD1O
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binary_platform = PLATFORM_RAD1O;
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#endif
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return binary_platform;
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}
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