while(1)
{
/* Toggle on user LED, indicating a SPI transfer is in progress */
//GPIO_toggle(CONFIG_GPIO_LED_1);
memset(slaveRxBuffer, 0, sizeof(slaveRxBuffer));
transferOK = SPI_transfer(slaveSpi, &transaction);
UART_PRINT("transferOK = %d \n\r", (int)transferOK);
if (transferOK)
{
Semaphore_pend(semSPIHandle, BIOS_WAIT_FOREVER);
UART_PRINT("SPI Continuing \n\r");
GPIO_write(CONFIG_SPI_SLAVE_READY, 0);
/* Wait until transfer has completed */
sem_wait(&slaveSem);
UART_PRINT("SPI tx wait done\r\n");
GPIO_write(CONFIG_SPI_SLAVE_READY, 1);
}
else {
}
delay_1ms(1);
}
上面这段代码，在SPI通讯成功若干次之后，会发生transferOK返回true，但是SPI回调函数（里面有一句sem_post(slaveSem)）没有调用，从而导致程序卡在了sem_wait(&slaveSem)这里，请问这是为什么？
证实是这个问题，因为串口中SPI continuing的log打印了，但是没有打印spi tx wait done的log
