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esp32-camera
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esp32-camera/driver/sccb.c

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/*
* This file is part of the OpenMV project.
* Copyright (c) 2013/2014 Ibrahim Abdelkader <i.abdalkader@gmail.com>
* This work is licensed under the MIT license, see the file LICENSE for details.
*
* SCCB (I2C like) driver.
*
*/
#include <stdbool.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include "sccb.h"
#include <stdio.h>
#include "sdkconfig.h"
#if defined(ARDUINO_ARCH_ESP32) && defined(CONFIG_ARDUHAL_ESP_LOG)
#include "esp32-hal-log.h"
#else
#include "esp_log.h"
static const char* TAG = "sccb";
#endif
#define LITTLETOBIG(x) ((x<<8)|(x>>8))
#ifdef CONFIG_SCCB_HARDWARE_I2C
#include "driver/i2c.h"
#define SCCB_FREQ 200000 /*!< I2C master frequency*/
#define WRITE_BIT I2C_MASTER_WRITE /*!< I2C master write */
#define READ_BIT I2C_MASTER_READ /*!< I2C master read */
#define ACK_CHECK_EN 0x1 /*!< I2C master will check ack from slave*/
#define ACK_CHECK_DIS 0x0 /*!< I2C master will not check ack from slave */
#define ACK_VAL 0x0 /*!< I2C ack value */
#define NACK_VAL 0x1 /*!< I2C nack value */
const int SCCB_I2C_PORT = 1;
static uint8_t ESP_SLAVE_ADDR = 0x3c;
#else
#include "twi.h"
#endif
int SCCB_Init(int pin_sda, int pin_scl)
{
ESP_LOGI(TAG, "pin_sda %d pin_scl %d\n", pin_sda, pin_scl);
#ifdef CONFIG_SCCB_HARDWARE_I2C
//log_i("SCCB_Init start");
i2c_config_t conf;
conf.mode = I2C_MODE_MASTER;
conf.sda_io_num = pin_sda;
conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
conf.scl_io_num = pin_scl;
conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
conf.master.clk_speed = SCCB_FREQ;
i2c_param_config(SCCB_I2C_PORT, &conf);
i2c_driver_install(SCCB_I2C_PORT, conf.mode, 0, 0, 0);
#else
twi_init(pin_sda, pin_scl);
#endif
return 0;
}
uint8_t SCCB_Probe()
{
#ifdef CONFIG_SCCB_HARDWARE_I2C
uint8_t slave_addr = 0x0;
while(slave_addr < 0x7f) {
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, ( slave_addr << 1 ) | WRITE_BIT, ACK_CHECK_EN);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(SCCB_I2C_PORT, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if( ret == ESP_OK) {
ESP_SLAVE_ADDR = slave_addr;
return ESP_SLAVE_ADDR;
}
slave_addr++;
}
return ESP_SLAVE_ADDR;
#else
uint8_t reg = 0x00;
uint8_t slv_addr = 0x00;
ESP_LOGI(TAG, "SCCB_Probe start");
for (uint8_t i = 0; i < 127; i++) {
if (twi_writeTo(i, &reg, 1, true) == 0) {
slv_addr = i;
break;
}
if (i!=126) {
vTaskDelay(10 / portTICK_PERIOD_MS); // Necessary for OV7725 camera (not for OV2640).
}
}
return slv_addr;
#endif
}
uint8_t SCCB_Read(uint8_t slv_addr, uint8_t reg)
{
#ifdef CONFIG_SCCB_HARDWARE_I2C
uint8_t data=0;
esp_err_t ret = ESP_FAIL;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, ( slv_addr << 1 ) | WRITE_BIT, ACK_CHECK_EN);
i2c_master_write_byte(cmd, reg, ACK_CHECK_EN);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(SCCB_I2C_PORT, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if(ret != ESP_OK) return -1;
cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, ( slv_addr << 1 ) | READ_BIT, ACK_CHECK_EN);
i2c_master_read_byte(cmd, &data, NACK_VAL);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(SCCB_I2C_PORT, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if(ret != ESP_OK) {
ESP_LOGE(TAG, "SCCB_Read Failed addr:0x%02x, reg:0x%02x, data:0x%02x, ret:%d", slv_addr, reg, data, ret);
}
return data;
#else
uint8_t data=0;
int rc = twi_writeTo(slv_addr, &reg, 1, true);
if (rc != 0) {
data = 0xff;
} else {
rc = twi_readFrom(slv_addr, &data, 1, true);
if (rc != 0) {
data=0xFF;
}
}
if (rc != 0) {
ESP_LOGE(TAG, "SCCB_Read [%02x] failed rc=%d\n", reg, rc);
}
return data;
#endif
}
uint8_t SCCB_Write(uint8_t slv_addr, uint8_t reg, uint8_t data)
{
#ifdef CONFIG_SCCB_HARDWARE_I2C
esp_err_t ret = ESP_FAIL;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, ( slv_addr << 1 ) | WRITE_BIT, ACK_CHECK_EN);
i2c_master_write_byte(cmd, reg, ACK_CHECK_EN);
i2c_master_write_byte(cmd, data, ACK_CHECK_EN);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(SCCB_I2C_PORT, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if(ret != ESP_OK) {
ESP_LOGE(TAG, "SCCB_Write Failed addr:0x%02x, reg:0x%02x, data:0x%02x, ret:%d", slv_addr, reg, data, ret);
}
return ret == ESP_OK ? 0 : -1;
#else
uint8_t ret=0;
uint8_t buf[] = {reg, data};
if(twi_writeTo(slv_addr, buf, 2, true) != 0) {
ret=0xFF;
}
if (ret != 0) {
ESP_LOGE(TAG, "SCCB_Write [%02x]=%02x failed\n", reg, data);
}
return ret;
#endif
}
uint8_t SCCB_Read16(uint8_t slv_addr, uint16_t reg)
{
#ifdef CONFIG_SCCB_HARDWARE_I2C
uint8_t data=0;
esp_err_t ret = ESP_FAIL;
uint16_t reg_htons = LITTLETOBIG(reg);
uint8_t *reg_u8 = (uint8_t *)&reg_htons;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, ( slv_addr << 1 ) | WRITE_BIT, ACK_CHECK_EN);
i2c_master_write_byte(cmd, reg_u8[0], ACK_CHECK_EN);
i2c_master_write_byte(cmd, reg_u8[1], ACK_CHECK_EN);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(SCCB_I2C_PORT, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if(ret != ESP_OK) return -1;
cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, ( slv_addr << 1 ) | READ_BIT, ACK_CHECK_EN);
i2c_master_read_byte(cmd, &data, NACK_VAL);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(SCCB_I2C_PORT, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if(ret != ESP_OK) {
ESP_LOGE(TAG, "W [%04x]=%02x fail\n", reg, data);
}
return data;
#else
uint8_t data=0;
uint16_t reg_htons = LITTLETOBIG(reg);
uint8_t *reg_u8 = (uint8_t *)&reg_htons;
uint8_t buf[] = {reg_u8[0], reg_u8[1]};
int rc = twi_writeTo(slv_addr, buf, 2, true);
if (rc != 0) {
data = 0xff;
} else {
rc = twi_readFrom(slv_addr, &data, 1, true);
if (rc != 0) {
data=0xFF;
}
}
if (rc != 0) {
ESP_LOGE(TAG, "R [%04x] fail rc=%d\n", reg, rc);
}
return data;
#endif
}
uint8_t SCCB_Write16(uint8_t slv_addr, uint16_t reg, uint8_t data)
{
static uint16_t i = 0;
#ifdef CONFIG_SCCB_HARDWARE_I2C
esp_err_t ret = ESP_FAIL;
uint16_t reg_htons = LITTLETOBIG(reg);
uint8_t *reg_u8 = (uint8_t *)&reg_htons;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, ( slv_addr << 1 ) | WRITE_BIT, ACK_CHECK_EN);
i2c_master_write_byte(cmd, reg_u8[0], ACK_CHECK_EN);
i2c_master_write_byte(cmd, reg_u8[1], ACK_CHECK_EN);
i2c_master_write_byte(cmd, data, ACK_CHECK_EN);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(SCCB_I2C_PORT, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if(ret != ESP_OK) {
ESP_LOGE(TAG, "W [%04x]=%02x %d fail\n", reg, data, i++);
}
return ret == ESP_OK ? 0 : -1;
#else
uint8_t ret=0;
uint16_t reg_htons = LITTLETOBIG(reg);
uint8_t *reg_u8 = (uint8_t *)&reg_htons;
uint8_t buf[] = {reg_u8[0], reg_u8[1], data};
if(twi_writeTo(slv_addr, buf, 3, true) != 0) {
ret = 0xFF;
}
if (ret != 0) {
ESP_LOGE(TAG, "W [%04x]=%02x %d fail\n", reg, data, i++);
}
return ret;
#endif
}