86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
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/*
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* This file is part of the OpenMV project.
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* Copyright (c) 2013/2014 Ibrahim Abdelkader <i.abdalkader@gmail.com>
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* This work is licensed under the MIT license, see the file LICENSE for details.
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*
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* SCCB (I2C like) driver.
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*
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*/
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#include <stdbool.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#include "sccb.h"
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#include "twi.h"
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#include <stdio.h>
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#include "sdkconfig.h"
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#if defined(ARDUINO_ARCH_ESP32) && defined(CONFIG_ARDUHAL_ESP_LOG)
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#include "esp32-hal-log.h"
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#else
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#include "esp_log.h"
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static const char* TAG = "sccb";
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#endif
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#define SCCB_FREQ (100000) // We don't need fast I2C. 100KHz is fine here.
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#define TIMEOUT (1000) /* Can't be sure when I2C routines return. Interrupts
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while polling hardware may result in unknown delays. */
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int SCCB_Init(int pin_sda, int pin_scl)
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{
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twi_init(pin_sda, pin_scl);
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return 0;
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}
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uint8_t SCCB_Probe()
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{
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uint8_t reg = 0x00;
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uint8_t slv_addr = 0x00;
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for (uint8_t i=0; i<127; i++) {
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if (twi_writeTo(i, ®, 1, true) == 0) {
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slv_addr = i;
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break;
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}
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if (i!=126) {
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vTaskDelay(1 / portTICK_PERIOD_MS); // Necessary for OV7725 camera (not for OV2640).
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}
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}
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return slv_addr;
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}
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uint8_t SCCB_Read(uint8_t slv_addr, uint8_t reg)
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{
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uint8_t data=0;
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int rc = twi_writeTo(slv_addr, ®, 1, true);
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if (rc != 0) {
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data = 0xff;
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}
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else {
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rc = twi_readFrom(slv_addr, &data, 1, true);
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if (rc != 0) {
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data=0xFF;
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}
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}
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if (rc != 0) {
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ESP_LOGE(TAG, "SCCB_Read [%02x] failed rc=%d\n", reg, rc);
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}
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return data;
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}
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uint8_t SCCB_Write(uint8_t slv_addr, uint8_t reg, uint8_t data)
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{
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uint8_t ret=0;
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uint8_t buf[] = {reg, data};
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if(twi_writeTo(slv_addr, buf, 2, true) != 0) {
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ret=0xFF;
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}
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if (ret != 0) {
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printf("SCCB_Write [%02x]=%02x failed\n", reg, data);
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}
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return ret;
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}
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