咨询ESP32S3的SPI时钟达不到80M，示波器看不到时钟

[matrixwell]

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]

1. #define SPI_PORT    SPI2_HOST
2. #define SPI_MISO    GPIO_NUM_13
3. #define SPI_MOSI    GPIO_NUM_11
4. #define SPI_CLK     GPIO_NUM_12
5. #define SPI_CS      GPIO_NUM_10
6. #define SPI_WP      GPIO_NUM_14
7. #define SPI_HD      GPIO_NUM_9
8.  
9. #define QPI_BUFFER_LEN  1024
10.  
11. static esp_err_t ret;
12. static spi_device_handle_t spi;
13. static spi_transaction_t trans;
14.  
15. void QPI_Init(void)
16. {
17.     int32_t i=0;
18.     spi_dma_chan_t dma = SPI_DMA_CH_AUTO;
19.     spi_bus_config_t buscfg={
20.         .miso_io_num = SPI_MISO,
21.         .mosi_io_num = SPI_MOSI,
22.         .sclk_io_num = SPI_CLK,
23.         .quadwp_io_num = SPI_WP,
24.         .quadhd_io_num = SPI_HD,
25.         //.max_transfer_sz = 64,
26.         .flags = SPICOMMON_BUSFLAG_MASTER|SPICOMMON_BUSFLAG_QUAD
27.     };
28.     ret = spi_bus_initialize(SPI_PORT, &buscfg, dma);
29.  
30.     spi_device_interface_config_t dev_config={
31.         .command_bits = 0,
32.         .address_bits = 0,
33.         .clock_speed_hz = SPI_MASTER_FREQ_80M,
34.         .mode = 0,
35.         .flags=SPI_DEVICE_HALFDUPLEX,
36.         .spics_io_num = SPI_CS,
37.         .duty_cycle_pos = 0,
38.         .queue_size = 6,
39.         //.post_cb=post_setup_cb
40.     };
41.     ret = spi_bus_add_device(SPI_PORT,&dev_config,&spi);
42.     memset(&trans, 0, sizeof(trans));
43.     memset(&qpi_rec, 0, sizeof(qpi_rec));
44.     trans.flags=SPI_TRANS_MODE_QIO;
45.     trans.tx_buffer =NULL;
46.     trans.rx_buffer = qpi_rec;
47.     trans.length = 0;
48.     trans.rxlength = QPI_BUFFER_LEN * 8;
49. }

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？