芯片用的是PIC24FJ128GA306
SPI初始化代码如下：





void SPI1_Initialize(void) {

    // SPI Frequency = 8,000,000 Hz; SSEN disabled; PPRE 1:1; SMP Sample at Middle; MSTEN enabled; MODE16 disabled; DISSCK disabled; SPRE 2:1; CKE Idle to Active; DISSDO disabled; CKP Idle:High, Active:Low;

    SPI1CON1 = 0x007B;

    // SPIFSD disabled; SPIFPOL disabled; SPIBEN enabled; SPIFE disabled; FRMEN disabled;

    SPI1CON2 = 0x8001;

    // SISEL SPI_INT_SPIRBF; SPIEN enabled; SPISIDL disabled; SPIROV disabled;

    SPI1STAT = 0x800C;



}







波形如下(CH1为SDO，CH2为NSS)：



CH1为SDO，CH2为NSS



为什么NSS在数据还没发送完毕就被拉高了，折腾了N久，求大神指教
此帖出自小平头技术问答