ESP32 Forum

Posted: **Thu Dec 29, 2022 2:19 am**

核心板是官方的 ESP32-S3-DevKitC-1
IDF版本5.0
SPI配置如下

Code: [Select all] [Expand/Collapse]

#define SPI_PORT    SPI2_HOST
#define SPI_MISO    GPIO_NUM_13
#define SPI_MOSI    GPIO_NUM_11
#define SPI_CLK     GPIO_NUM_12
#define SPI_CS      GPIO_NUM_10
#define SPI_WP      GPIO_NUM_14
#define SPI_HD      GPIO_NUM_9
 
#define QPI_BUFFER_LEN  1024
 
static esp_err_t ret;
static spi_device_handle_t spi;
static spi_transaction_t trans;
 
void QPI_Init(void)
{
    int32_t i=0;
    spi_dma_chan_t dma = SPI_DMA_CH_AUTO;
    spi_bus_config_t buscfg={
        .miso_io_num = SPI_MISO,
        .mosi_io_num = SPI_MOSI,
        .sclk_io_num = SPI_CLK,
        .quadwp_io_num = SPI_WP,
        .quadhd_io_num = SPI_HD,
        //.max_transfer_sz = 64,
        .flags = SPICOMMON_BUSFLAG_MASTER|SPICOMMON_BUSFLAG_QUAD
    };
    ret = spi_bus_initialize(SPI_PORT, &buscfg, dma);
 
    spi_device_interface_config_t dev_config={
        .command_bits = 0,
        .address_bits = 0,
        .clock_speed_hz = SPI_MASTER_FREQ_80M,
        .mode = 0,
        .flags=SPI_DEVICE_HALFDUPLEX,
        .spics_io_num = SPI_CS,
        .duty_cycle_pos = 0,
        .queue_size = 6,
        //.post_cb=post_setup_cb
    };
    ret = spi_bus_add_device(SPI_PORT,&dev_config,&spi);
    memset(&trans, 0, sizeof(trans));
    memset(&qpi_rec, 0, sizeof(qpi_rec));
    trans.flags=SPI_TRANS_MODE_QIO;
    trans.tx_buffer =NULL;
    trans.rx_buffer = qpi_rec;
    trans.length = 0;
    trans.rxlength = QPI_BUFFER_LEN * 8;
}

GeSHi © Codebox Plus Extension

示波器看SCLK，基本看不到时钟波形

修改时钟频率到40M时SCLK的波形

修改时钟频率到20M时SCLK的波形

请问这个地方应该如何调整，能使用80M时钟？

ESP32 Forum

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