Posted on June 01, 2016 at 17:01
Why after transmitting and receiving 6 bytes as specified, my previous data being transmitted(HAL_SPI_Transmit(&hspi1, WREG1, 3, 3) WREG = {0x43, 0x00, 0x00})?
Hi
I'm trying to communicate with ADC through SPI interface with HAL layer and ended up with issues.At start I configure adc:HAL_SPI_Transmit(&hspi1, &SDATAC, 1, 3); //0x16HAL_GPIO_WritePin(GPIOC, START_Pin, GPIO_PIN_SET); HAL_SPI_Transmit(&hspi1, WREG1, 3, 3); {0x43, 0x00, 0x00}HAL_SPI_Transmit(&hspi1, WREG2, 3, 3); {0x42, 0x00, 0x30}HAL_SPI_Transmit(&hspi1, WREG3, 4, 3); {0x4a, 0x01, 0x06, 0x0f}HAL_SPI_Transmit(&hspi1, &RDATAC, 1, 3); //0x12and waiting for falling edge interrupt(data ready signal from adc):void EXTI9_5_IRQHandler(void){ HAL_SPI_TransmitReceive_DMA(&hspi1, NOP, cdata, 6); //NOP = {0xff, 0xff, 0xff,}//cdata[3] HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_9);}And here's what I get:Why after transmitting and receiving 6 bytes as specified, my previous data being transmitted(HAL_SPI_Transmit(&hspi1, WREG1, 3, 3) WREG = {0x43, 0x00, 0x00})?
