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Add pull up testing, proper us delay and stop supporting 45 and 46 for I2C

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This commit is contained in:
Scott Shawcroft 2020-06-03 14:05:21 -07:00
parent ae52d052cb
commit 6f050d7af3
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GPG Key ID: 9349BC7E64B1921E
2 changed files with 28 additions and 47 deletions
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72
ports/esp32s2/common-hal/busio/I2C.c
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@ -3,7 +3,7 @@
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Scott Shawcroft
* Copyright (c) 2020 Scott Shawcroft for Adafruit Industries LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@ -30,16 +30,9 @@
#include "driver/i2c.h"
#include "esp_log.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "supervisor/shared/translate.h"
// Number of times to try to send packet if failed.
#define ATTEMPTS 2
static const char* TAG = "CircuitPython I2C";
typedef enum {
STATUS_FREE = 0,
STATUS_IN_USE,
@ -63,42 +56,43 @@ void i2c_reset(void) {
void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
const mcu_pin_obj_t* scl, const mcu_pin_obj_t* sda, uint32_t frequency, uint32_t timeout) {
// Make sure scl and sda aren't input only
// Pins 45 and 46 are "strapping" pins that impact start up behavior. They usually need to
// be pulled-down so pulling them up for I2C is a bad idea. To make this hard, we don't
// support I2C on these pins.
//
// 46 is also input-only so it'll never work.
if (scl->number == 45 || scl->number == 46 || sda->number == 45 || sda->number == 46) {
mp_raise_ValueError(translate("Invalid pins"));
}
#if CIRCUITPY_REQUIRE_I2C_PULLUPS
// // Test that the pins are in a high state. (Hopefully indicating they are pulled up.)
// gpio_set_pin_function(sda->number, GPIO_PIN_FUNCTION_OFF);
// gpio_set_pin_function(scl->number, GPIO_PIN_FUNCTION_OFF);
// gpio_set_pin_direction(sda->number, GPIO_DIRECTION_IN);
// gpio_set_pin_direction(scl->number, GPIO_DIRECTION_IN);
// Test that the pins are in a high state. (Hopefully indicating they are pulled up.)
gpio_set_direction(sda->number, GPIO_MODE_DEF_INPUT);
gpio_set_direction(scl->number, GPIO_MODE_DEF_INPUT);
// gpio_set_pin_pull_mode(sda->number, GPIO_PULL_DOWN);
// gpio_set_pin_pull_mode(scl->number, GPIO_PULL_DOWN);
gpio_pulldown_en(sda->number);
gpio_pulldown_en(scl->number);
// common_hal_mcu_delay_us(10);
common_hal_mcu_delay_us(10);
// gpio_set_pin_pull_mode(sda->number, GPIO_PULL_OFF);
// gpio_set_pin_pull_mode(scl->number, GPIO_PULL_OFF);
gpio_pulldown_dis(sda->number);
gpio_pulldown_dis(scl->number);
// // We must pull up within 3us to achieve 400khz.
// common_hal_mcu_delay_us(3);
// We must pull up within 3us to achieve 400khz.
common_hal_mcu_delay_us(3);
// if (!gpio_get_pin_level(sda->number) || !gpio_get_pin_level(scl->number)) {
// reset_pin_number(sda->number);
// reset_pin_number(scl->number);
// mp_raise_RuntimeError(translate("SDA or SCL needs a pull up"));
// }
if (gpio_get_level(sda->number) == 0 || gpio_get_level(scl->number) == 0) {
reset_pin_number(sda->number);
reset_pin_number(scl->number);
mp_raise_RuntimeError(translate("SDA or SCL needs a pull up"));
}
#endif
ESP_EARLY_LOGW(TAG, "create I2C");
self->semaphore_handle = xSemaphoreCreateBinaryStatic(&self->semaphore);
xSemaphoreGive(self->semaphore_handle);
ESP_EARLY_LOGW(TAG, "new I2C lock %x", self->semaphore_handle);
self->sda_pin = sda;
self->scl_pin = scl;
ESP_EARLY_LOGW(TAG, "scl %d sda %d", self->sda_pin->number, self->scl_pin->number);
self->i2c_num = I2C_NUM_MAX;
for (i2c_port_t num = 0; num < I2C_NUM_MAX; num++) {
if (i2c_status[num] == STATUS_FREE) {
@ -120,15 +114,10 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
.clk_speed = frequency,
}
};
// ESP_EARLY_LOGW(TAG, "param config %p %p %d %d", &i2c_conf, &(i2c_conf.mode), i2c_conf.mode, I2C_MODE_MAX);
ESP_EARLY_LOGW(TAG, "param config %p %d %d", &i2c_conf, i2c_conf.mode, I2C_MODE_MAX);
esp_err_t result = i2c_param_config(self->i2c_num, &i2c_conf);
if (result != ESP_OK) {
ESP_EARLY_LOGW(TAG, "error %d %p %d %d", result, &i2c_conf, (&i2c_conf)->mode, I2C_MODE_MAX);
vTaskDelay(0);
mp_raise_ValueError(translate("Invalid pins"));
}
ESP_EARLY_LOGW(TAG, "param config I2C done");
result = i2c_driver_install(self->i2c_num,
I2C_MODE_MASTER,
0,
@ -140,7 +129,6 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
claim_pin(sda);
claim_pin(scl);
ESP_EARLY_LOGW(TAG, "create I2C done");
}
bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self) {
@ -166,19 +154,13 @@ bool common_hal_busio_i2c_probe(busio_i2c_obj_t *self, uint8_t addr) {
i2c_master_start(cmd);
i2c_master_write_byte(cmd, addr << 1, true);
i2c_master_stop(cmd);
esp_err_t result = i2c_master_cmd_begin(self->i2c_num, cmd, 100);
esp_err_t result = i2c_master_cmd_begin(self->i2c_num, cmd, 10);
i2c_cmd_link_delete(cmd);
return result == ESP_OK;
}
bool common_hal_busio_i2c_try_lock(busio_i2c_obj_t *self) {
ESP_EARLY_LOGW(TAG, "locking I2C %x", self->semaphore_handle);
self->has_lock = xSemaphoreTake(self->semaphore_handle, 0) == pdTRUE;
if (self->has_lock) {
ESP_EARLY_LOGW(TAG, "lock grabbed");
} else {
ESP_EARLY_LOGW(TAG, "unable to grab lock");
}
return self->has_lock;
}
@ -187,7 +169,6 @@ bool common_hal_busio_i2c_has_lock(busio_i2c_obj_t *self) {
}
void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self) {
ESP_EARLY_LOGW(TAG, "unlocking I2C");
xSemaphoreGive(self->semaphore_handle);
self->has_lock = false;
}
@ -213,8 +194,7 @@ uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr,
}
uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t addr,
uint8_t *data, size_t len) {
uint8_t *data, size_t len) {
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, addr << 1 | 1, true); // | 1 to indicate read

3
ports/esp32s2/mphalport.c
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@ -32,9 +32,10 @@
#include "py/gc.h"
#include "esp-idf/components/xtensa/include/esp_debug_helpers.h"
#include "esp-idf/components/esp_rom/include/esp32s2/rom/ets_sys.h"
void mp_hal_delay_us(mp_uint_t delay) {
mp_hal_delay_ms(delay / 1000);
ets_delay_us(delay);
}
// This is provided by the esp-idf/components/xtensa/esp32s2/libhal.a binary