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/*
* SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
#include <stdio.h>
#include <inttypes.h>
#include <unistd.h>
#include "esp_adc/adc_oneshot.h"
#include "driver/gpio.h"
#include "esp_cpu.h"
#include "esp_log.h"
#include "sd_test_io.h"
const static char *TAG = "SD_TEST";
#define ADC_ATTEN_DB ADC_ATTEN_DB_12
#define GPIO_INPUT_PIN_SEL(pin) (1ULL<<pin)
#if CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
static bool adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle)
{
adc_cali_handle_t handle = NULL;
esp_err_t ret = ESP_FAIL;
bool calibrated = false;
#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
if (!calibrated) {
adc_cali_curve_fitting_config_t cali_config = {
.unit_id = unit,
.chan = channel,
.atten = atten,
.bitwidth = ADC_BITWIDTH_DEFAULT,
};
ret = adc_cali_create_scheme_curve_fitting(&cali_config, &handle);
if (ret == ESP_OK) {
calibrated = true;
}
}
#endif //ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
#if ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
if (!calibrated) {
adc_cali_line_fitting_config_t cali_config = {
.unit_id = unit,
.atten = atten,
.bitwidth = ADC_BITWIDTH_DEFAULT,
};
ret = adc_cali_create_scheme_line_fitting(&cali_config, &handle);
if (ret == ESP_OK) {
calibrated = true;
}
}
#endif //ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
*out_handle = handle;
if (ret != ESP_OK) {
if (ret == ESP_ERR_NOT_SUPPORTED || !calibrated) {
ESP_LOGW(TAG, "eFuse not burnt, skip software calibration");
} else {
ESP_LOGE(TAG, "Invalid arg or no memory");
}
}
return calibrated;
}
static void example_adc_calibration_deinit(adc_cali_handle_t handle)
{
#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
ESP_ERROR_CHECK(adc_cali_delete_scheme_curve_fitting(handle));
#elif ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
ESP_ERROR_CHECK(adc_cali_delete_scheme_line_fitting(handle));
#endif
}
static float get_pin_voltage(int i, adc_oneshot_unit_handle_t adc_handle, bool do_calibration, adc_cali_handle_t adc_cali_handle)
{
int voltage = 0;
int val;
adc_oneshot_chan_cfg_t config = {
.bitwidth = ADC_BITWIDTH_DEFAULT,
.atten = ADC_ATTEN_DB,
};
ESP_ERROR_CHECK(adc_oneshot_config_channel(adc_handle, i, &config));
ESP_ERROR_CHECK(adc_oneshot_read(adc_handle, i, &val));
if (do_calibration) {
ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc_cali_handle, val, &voltage));
}
return (float)voltage/1000;
}
#endif //CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
static uint32_t get_cycles_until_pin_level(int i, int level, int timeout) {
uint32_t start = esp_cpu_get_cycle_count();
while(gpio_get_level(i) == !level && esp_cpu_get_cycle_count() - start < timeout) {
;
}
uint32_t end = esp_cpu_get_cycle_count();
return end - start;
}
void check_sd_card_pins(pin_configuration_t *config, const int pin_count)
{
ESP_LOGI(TAG, "Testing SD pin connections and pullup strength");
gpio_config_t io_conf = {};
for (int i = 0; i < pin_count; ++i) {
io_conf.intr_type = GPIO_INTR_DISABLE;
io_conf.mode = GPIO_MODE_INPUT_OUTPUT_OD;
io_conf.pin_bit_mask = GPIO_INPUT_PIN_SEL(config->pins[i]);
io_conf.pull_down_en = 0;
io_conf.pull_up_en = 0;
gpio_config(&io_conf);
}
printf("\n**** PIN recovery time ****\n\n");
for (int i = 0; i < pin_count; ++i) {
gpio_set_direction(config->pins[i], GPIO_MODE_INPUT_OUTPUT_OD);
gpio_set_level(config->pins[i], 0);
usleep(100);
gpio_set_level(config->pins[i], 1);
uint32_t cycles = get_cycles_until_pin_level(config->pins[i], 1, 10000);
printf("PIN %2d %3s %"PRIu32" cycles\n", config->pins[i], config->names[i], cycles);
}
printf("\n**** PIN recovery time with weak pullup ****\n\n");
for (int i = 0; i < pin_count; ++i) {
gpio_set_direction(config->pins[i], GPIO_MODE_INPUT_OUTPUT_OD);
gpio_pullup_en(config->pins[i]);
gpio_set_level(config->pins[i], 0);
usleep(100);
gpio_set_level(config->pins[i], 1);
uint32_t cycles = get_cycles_until_pin_level(config->pins[i], 1, 10000);
printf("PIN %2d %3s %"PRIu32" cycles\n", config->pins[i], config->names[i], cycles);
gpio_pullup_dis(config->pins[i]);
}
#if CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
adc_oneshot_unit_handle_t adc_handle;
adc_oneshot_unit_init_cfg_t init_config = {
.unit_id = CONFIG_EXAMPLE_ADC_UNIT,
};
ESP_ERROR_CHECK(adc_oneshot_new_unit(&init_config, &adc_handle));
adc_cali_handle_t *adc_cali_handle = (adc_cali_handle_t *)malloc(sizeof(adc_cali_handle_t)*pin_count);
bool *do_calibration = (bool *)malloc(sizeof(bool)*pin_count);
for (int i = 0; i < pin_count; i++) {
do_calibration[i] = adc_calibration_init(CONFIG_EXAMPLE_ADC_UNIT, i, ADC_ATTEN_DB, &adc_cali_handle[i]);
}
printf("\n**** PIN voltage levels ****\n\n");
for (int i = 0; i < pin_count; ++i) {
float voltage = get_pin_voltage(config->adc_channels[i], adc_handle, do_calibration[i], adc_cali_handle[i]);
printf("PIN %2d %3s %.1fV\n", config->pins[i], config->names[i], voltage);
}
printf("\n**** PIN voltage levels with weak pullup ****\n\n");
for (int i = 0; i < pin_count; ++i) {
gpio_pullup_en(config->pins[i]);
usleep(100);
float voltage = get_pin_voltage(config->adc_channels[i], adc_handle, do_calibration[i], adc_cali_handle[i]);
printf("PIN %2d %3s %.1fV\n", config->pins[i], config->names[i], voltage);
gpio_pullup_dis(config->pins[i]);
}
printf("\n**** PIN cross-talk ****\n\n");
printf(" ");
for (int i = 0; i < pin_count; ++i) {
printf("%3s ", config->names[i]);
}
printf("\n");
for (int i = 0; i < pin_count; ++i) {
gpio_set_direction(config->pins[i], GPIO_MODE_INPUT_OUTPUT_OD);
gpio_set_level(config->pins[i], 0);
printf("PIN %2d %3s ", config->pins[i], config->names[i]);
for (int j = 0; j < pin_count; ++j) {
if (j == i) {
printf(" -- ");
continue;
}
usleep(100);
float voltage = get_pin_voltage(config->adc_channels[j], adc_handle, do_calibration[i], adc_cali_handle[i]);
printf("%1.1fV ", voltage);
}
printf("\n");
gpio_set_direction(config->pins[i], GPIO_MODE_INPUT);
}
printf("\n**** PIN cross-talk with weak pullup ****\n\n");
printf(" ");
for (int i = 0; i < pin_count; ++i) {
printf("%3s ", config->names[i]);
}
printf("\n");
for (int i = 0; i < pin_count; ++i) {
gpio_set_direction(config->pins[i], GPIO_MODE_INPUT_OUTPUT_OD);
gpio_set_level(config->pins[i], 0);
printf("PIN %2d %3s ", config->pins[i], config->names[i]);
for (int j = 0; j < pin_count; ++j) {
if (j == i) {
printf(" -- ");
continue;
}
gpio_pullup_en(config->pins[j]);
usleep(100);
float voltage = get_pin_voltage(config->adc_channels[j], adc_handle, do_calibration[i], adc_cali_handle[i]);
printf("%1.1fV ", voltage);
gpio_pullup_dis(config->pins[j]);
}
printf("\n");
gpio_set_direction(config->pins[i], GPIO_MODE_INPUT);
}
for (int i = 0; i < pin_count; ++i) {
if (do_calibration[i]) {
example_adc_calibration_deinit(adc_cali_handle[i]);
}
}
#endif //CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
}
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