Category: Software
Product Number: EVAL-ADUCM362QSPZ
Hi! I am developing a program for the ADuCM362 eval board that utilizes the SPI DMA peripheral in ping-pong mode (only TX). I have been success full in generating SPI writes, however each byte is sent twice. For example the first value in the buffer is decimal 0 and the second is decimal 1. On the oscilloscope I will see "0x00" then "0x00" then the next value "0x01" and then "0x01" again. It doesn't matter what value is being sent nor by which DMA data structure.
I have set DST_SIZE, SRC_SIZE, DST_IN, and SRC_INC all to "byte" or 011. Is there any other SPI or DMA settings that could cause this? I am using the given ADuCM362 drivers and the setup code is shown below.
void SPI1_INIT() {
SpiFifoFlush(pADI_SPI1, SPICON_TFLUSH_EN, SPICON_RFLUSH_EN); /* Flush Tx and Rx FIFOs */
SpiFifoFlush(pADI_SPI1, SPICON_TFLUSH_DIS, SPICON_RFLUSH_EN); /* Flush Tx and Rx FIFOs */
// Set mode for SPI1 pins
DioCfgPin(pADI_GP0, PIN0, 1); // SPI1 MISO
DioCfgPin(pADI_GP0, PIN1, 1); // SPI1 SCLK
DioCfgPin(pADI_GP0, PIN2, 1); // SPI1 MOSI
DioCfgPin(pADI_GP0, PIN3, 1); // SPI1 SS (NOTE: not broken out to anything on my board)
// Set the SPI1 clock rate in master mode to 1MHz. (SPIDIV)
SpiBaud(pADI_SPI1, 7, SPIDIV_BCRST_DIS);
SpiCfg(pADI_SPI1, SPICON_MOD_TX1RX1, SPICON_MASEN_EN, SPICON_CON_EN | SPICON_LOOPBACK_DIS |
SPICON_RXOF_DIS | SPICON_ZEN_DIS | SPICON_TIM_TXWR | SPICON_CPOL_LOW |
SPICON_CPHA_SAMPLELEADING | SPICON_ENABLE_EN); // Configure SPI1 channel (SPICON)
// These all act on the DmaStruct
DmaPeripheralStructSetup(SPI1TX_C, DMA_DSTINC_NO | DMA_SRCINC_BYTE | DMA_SIZE_BYTE); // Setup SPI1 Tx DMA primary structure
DmaStructPtrOutSetup(SPI1TX_C, SPI1_TX_BUFFER_SIZE, ucSPI1txPrim);
DmaCycleCntCtrl(SPI1TX_C, SPI1_TX_BUFFER_SIZE, DMA_PING);
DmaPeripheralStructSetup(SPI1TX_C+ALTERNATE, DMA_DSTINC_NO | DMA_SRCINC_BYTE | DMA_SIZE_BYTE); // Setup SPI1 Tx DMA alternate structure
DmaStructPtrOutSetup(SPI1TX_C+ALTERNATE, SPI1_TX_BUFFER_SIZE, ucSPI1txAlt);
DmaCycleCntCtrl(SPI1TX_C+ALTERNATE, SPI1_TX_BUFFER_SIZE, DMA_PING);
DmaSet(0, DMAENSET_SPI1TX, 0, 0); // Enable DMA (DMAENSET)
NVIC_EnableIRQ(DMA_SPI1_TX_IRQn);
}
void DMA_INIT() {
DmaBase();
}