I am having trouble with the receive side of SPI 1 instance on the AM437x GP EVM. I have modified the MCSPI example to use instance 1 with the following settings. I can see data transmit out properly on oscope. I can see the slave respond properly. I receive an RXfull interrupt, but all zeros are always put into the RXFIFO even though I can clearly see different results on the D0 input pin. I attempted to swap D0 and D1 to check for a damaged input, but the results were the same....transmits fine but stores all 0's in RXFIFO. See code snippets below.
Thanks,
John
static const mcspiAppCfgObj_t MCSPIAPPFLASH_DEFAULT =
{
1U, /* instNum.*/
0x481A0000U, /* instAddr.*/
48000000U, /* inClk.*/
12000000U, /* outClk.*/
0U, /* channelNum.*/
2U, /* dataLength.*/
gFlashAppTxBuffer, /* pTx.*/
gFlashAppRxBuffer, /* rTx.*/
{
MCSPI_CH_SINGLE, /* channel.*/
MCSPI_TRANSFER_MODE_TX_RX, /* txRxMode.*/
MCSPI_DATA_LINE_COMM_MODE_1, /* pinMode. */
MCSPI_CLK_MODE_1, /* clkMode.*/
8U, /* wordLength.*/
MCSPI_CS_POL_LOW, /* csPolarity.*/
TRUE, /* txFifoCfg.*/
TRUE, /* rxFifoCfg.*/
MCSPI_INTR_TX_EMPTY(0U) | \
MCSPI_INTR_RX_FULL(0U) /* interrupt.*/
},
{
INTC_TRIG_HIGH_LEVEL, /* trigType.*/
157U, /* intrLine */
10U, /* intrPriority.*/
FALSE, /* isIntrSecure.*/
gFlashAppTxBuffer, /* pTxBuf.*/
gFlashAppRxBuffer, /* pRxBuf.*/
NULL /* pFnIntrHandler.*/
},
{
TRUE, /* csFlag.*/
MCSPI_MODE_MASTER, /* modeFlag.*/
MCSPI_INTERRUPT_MODE /* comFlag.*/
}
};
Here is the main loop
int main()
{
gFlashAppCfg = MCSPIAPPFLASH_DEFAULT;
/* Initialize the UART console */
CONSOLEUtilsInit();
/* Select the console type based on compile time check */
CONSOLEUtilsSetType(CONSOLE_UTILS_TYPE_UART);
BOARDInit(NULL);
/* Initialize the MCSPI controller. */
MCSPIAppInit(&gFlashAppCfg);
McspiAppIsWriteSuccess(&gFlashAppCfg);
}
static uint32_t McspiAppIsWriteSuccess(mcspiAppCfgObj_t *pCfgMcspi)
{
uint8_t temprx = 0xFFu;
gFlashAppTxBuffer[0U] = 54U;
gFlashAppTxBuffer[1U] = 0xFFU;
pCfgMcspi->dataLength = 2U;
MCSPIAppTransfer(pCfgMcspi);
temprx = gFlashAppRxBuffer[0U];
temprx = gFlashAppRxBuffer[1U];
return(1U);
}
static uint32_t McspiAppIsWriteSuccess(mcspiAppCfgObj_t *pCfgMcspi)
{
uint8_t temprx = 0xFFu;
gFlashAppTxBuffer[0U] = 54U; // read command to slave
gFlashAppTxBuffer[1U] = 0xFFU; // dummy write for read
pCfgMcspi->dataLength = 2U;
MCSPIAppTransfer(pCfgMcspi);
temprx = gFlashAppRxBuffer[0U];
temprx = gFlashAppRxBuffer[1U];
return(1U);
}
int32_t MCSPIAppInit(mcspiAppCfgObj_t *pCfgMcspi)
{
/* Clock Configuration. */
PRCMModuleEnable(CHIPDB_MOD_ID_MCSPI, pCfgMcspi->instNum, 0U);
/* Perform the MCSPI pinmux. */
PINMUXModuleConfig(CHIPDB_MOD_ID_MCSPI, pCfgMcspi->instNum, NULL);
if(MCSPI_INTERRUPT_MODE == pCfgMcspi->pAppFlag.comFlag)
{
/* Register the MCSPI interrupts. */
McspiAppIntrConfig(pCfgMcspi);
/* Reset the MCSPI instance.*/
MCSPIReset(pCfgMcspi->instAddr);
if (TRUE == pCfgMcspi->pAppFlag.csFlag)
{
/* Enable CS. */
MCSPICsEnable(pCfgMcspi->instAddr, TRUE);
/* Set the CS polarity. */
MCSPISetCsPol(pCfgMcspi->instAddr,
pCfgMcspi->channelNum,
pCfgMcspi->pAppCfg.csPolarity);
}
else if (FALSE == pCfgMcspi->pAppFlag.csFlag)
{
/**
* Disable CS. In this scenario the CS will be handled
* externally. E.g. would be using an external GPIO pin
* or the CS pin of slave device is pulled to the required
* polarity as default.
*/
MCSPICsEnable(pCfgMcspi->instAddr, FALSE);
}
if (MCSPI_MODE_MASTER == pCfgMcspi->pAppFlag.modeFlag)
{
/* Perform the necessary configuration for master mode.*/
MCSPIModeConfig(pCfgMcspi->instAddr,
pCfgMcspi->channelNum,
pCfgMcspi->pAppFlag.modeFlag,
pCfgMcspi->pAppCfg.channel,
pCfgMcspi->pAppCfg.txRxMode,
pCfgMcspi->pAppCfg.pinMode);
/* Configure the clock speed on the bus. */
MCSPIClkConfig(pCfgMcspi->instAddr,
pCfgMcspi->channelNum,
pCfgMcspi->inClk,
pCfgMcspi->outClk,
pCfgMcspi->pAppCfg.clkMode);
}
else if (MCSPI_MODE_SLAVE == pCfgMcspi->pAppFlag.modeFlag)
{
/* Perform the necessary configuration for slave mode.*/
MCSPIModeConfig(pCfgMcspi->instAddr,
pCfgMcspi->channelNum,
pCfgMcspi->pAppFlag.modeFlag,
pCfgMcspi->pAppCfg.channel,
pCfgMcspi->pAppCfg.txRxMode,
pCfgMcspi->pAppCfg.pinMode);
}
/* Configure the word length. */
MCSPISetWordLength(pCfgMcspi->instAddr,
pCfgMcspi->channelNum,
pCfgMcspi->pAppCfg.wordLength);
/* Enable/disable the Tx FIFO. */
MCSPITxFifoEnable(pCfgMcspi->instAddr,
pCfgMcspi->channelNum,
pCfgMcspi->pAppCfg.txFifoCfg);
/* Enable/disable the Rx FIFO. */
MCSPIRxFifoEnable(pCfgMcspi->instAddr,
pCfgMcspi->channelNum,
pCfgMcspi->pAppCfg.rxFifoCfg);
/* Set Transfer Interrupt Levels*/ // I added this to get RX full interrupt to generate
MCSPISetFifoTriggerLvl(pCfgMcspi->instAddr,
1U,
1U,
pCfgMcspi->pAppCfg.txRxMode);
}
else if(MCSPI_DMA_MODE == pCfgMcspi->pAppFlag.comFlag)
{
CONSOLEUtilsPrintf("\n DMA mode is not supported !\n");
}
return(1U);
}
Here are my pinmux settings
static pinmuxPerCfg_t gSpi1PinCfg[] =
{
{
/* MySPI1 -> spi1_sclk -> N24 */
PIN_MCASP0_ACLKX, 0, \
( \
PIN_MODE(3) | \
((PIN_PULL_UD_DIS | PIN_PULL_UP_EN | PIN_DS_VALUE_OVERRIDE_EN | PIN_DS_OP_DIS | PIN_DS_PULL_UP_EN) & \
(~PIN_RX_ACTIVE & ~PIN_DS_OP_VAL_1 & ~PIN_DS_PULL_UD_EN & ~PIN_WAKE_UP_EN))
) \
},
{
/* MySPI1 -> spi1_d0 -> N22 MISO*/
PIN_MCASP0_FSX, 0, \
( \
PIN_MODE(3) | \
((PIN_RX_ACTIVE | PIN_DS_VALUE_OVERRIDE_EN | PIN_DS_OP_DIS | PIN_DS_PULL_UP_EN) & \
(~PIN_PULL_UD_DIS & ~PIN_PULL_UP_EN & ~PIN_DS_OP_VAL_1 & ~PIN_DS_PULL_UD_EN & ~PIN_WAKE_UP_EN))
) \
},
{
/* MySPI1 -> spi1_d1 -> H23 MOSI*/
PIN_MCASP0_AXR0, 0, \
( \
PIN_MODE(3) | \
((PIN_PULL_UD_DIS | PIN_PULL_UP_EN | PIN_DS_VALUE_OVERRIDE_EN | PIN_DS_OP_DIS | PIN_DS_PULL_UP_EN) & \
(~PIN_RX_ACTIVE & ~PIN_DS_OP_VAL_1 & ~PIN_DS_PULL_UD_EN & ~PIN_WAKE_UP_EN))
) \
},
{
/* MySPI1 -> spi1_cs0 -> M24 */
PIN_MCASP0_AHCLKR, 0, \
( \
PIN_MODE(3) | \
((PIN_PULL_UD_DIS | PIN_PULL_UP_EN | PIN_DS_VALUE_OVERRIDE_EN | PIN_DS_OP_DIS | PIN_DS_PULL_UP_EN) & \
(~PIN_RX_ACTIVE & ~PIN_DS_OP_VAL_1 & ~PIN_DS_PULL_UD_EN & ~PIN_WAKE_UP_EN))
) \
},
{PINMUX_INVALID_PIN}
};
