ov7670摄像头通讯问题

[zyl2995230]

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Issue or Suggestion Description

esp32-idf版本: 5.4
esp32-camera版本: 2.0.15

ov7670摄像头sccb通讯一切正常，但是在PID获取时从机无应答(NACK)，我查看并修改了源码后PID获取成功，摄像头初始化成功。这是什么原因导致的？修改代码如下：

路径：managed_components\espressif__esp32-camera\driver\sccb.c

uint8_t SCCB_Read(uint8_t slv_addr, uint8_t reg)
{
i2c_master_dev_handle_t dev_handle = *(get_handle_from_address(slv_addr));

uint8_t tx_buffer[1];
uint8_t rx_buffer[1];

tx_buffer[0] = reg;
i2c_master_transmit(dev_handle, tx_buffer,1,TIMEOUT_MS);
esp_err_t ret = i2c_master_receive(dev_handle,rx_buffer, 1, TIMEOUT_MS);
// esp_err_t ret = i2c_master_transmit_receive(dev_handle, tx_buffer, 1, rx_buffer, 1, TIMEOUT_MS);

if (ret != ESP_OK)
{
    ESP_LOGE(TAG, "SCCB_Read Failed addr:0x%02x, reg:0x%02x, data:0x%02x, ret:%d", slv_addr, reg, rx_buffer[0], ret);
}

return rx_buffer[0];

}

[zyl2995230]

示波器检查了，发现PID请求发送后从机应答了，但是在发送PID读取时读写位是低电平，正常来说读数据时为高电平才对