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Hi,
Is there any example code which uses the motorware driver library for setting up SPI?
Specifically, I'm having the devil of a job trying to get an SPI input feed operational from an encoder source.
Setting the F29069M up as an SPI slave with only MISO and CLK connections, I can clearly see the incoming datastream on GPIO17 (data) and GPIO18 (clk) - see picture below. The RX interrupt is firing on a regular beat, but within the interrupt handler:
- SPIDAT is 0xFFFF
- SPIRXBUF is 0xFFFF
- FifoStatus reads empty
Based on lab code examples, GPIO has been setup as:
GPIO_setMode(obj->gpioHandle, GPIO_Number_17, GPIO_17_Mode_SPISOMIA);
GPIO_setDirection(obj->gpioHandle, GPIO_Number_17, GPIO_Direction_Input);
GPIO_setQualification(obj->gpioHandle, GPIO_Number_17, GPIO_Qual_ASync);
GPIO_setMode(obj->gpioHandle, GPIO_Number_18, GPIO_18_Mode_SPICLKA);
GPIO_setDirection(obj->gpioHandle, GPIO_Number_18, GPIO_Direction_Input);
GPIO_setQualification(obj->gpioHandle, GPIO_Number_18, GPIO_Qual_ASync);Clocks added to the clock section :
CLK_enableSpiaClock(obj->clkHandle);
CLK_disableSpibClock(obj->clkHandle);
New SPI Setup routine added:
void HAL_setupSPI(HAL_Handle handle)
{
HAL_Obj *obj = (HAL_Obj *) handle;
SPI_reset(obj->spiaHandle);
SPI_enableRxFifo(obj->spiaHandle);
SPI_setRxFifoIntLevel(obj->spiaHandle, SPI_FifoLevel_2_Words);
SPI_disableLoopBack(obj->spiaHandle);
SPI_setBaudRate(obj->spiaHandle, SPI_BaudRate_1_MBaud);
SPI_setCharLength(obj->spiaHandle, SPI_CharLength_16_Bits);
SPI_setClkPhase(obj->spiaHandle, SPI_ClkPhase_Normal);
SPI_setClkPolarity(obj->spiaHandle, SPI_ClkPolarity_OutputRisingEdge_InputFallingEdge);
SPI_setMode(obj->spiaHandle, SPI_Mode_Slave);
SPI_enableRxFifoInt(obj->spiaHandle);
SPI_enableInt(obj->spiaHandle);
SPI_enable(obj->spiaHandle);
SPI_resetRxFifo(obj->spiaHandle);
PIE_enableInt(obj->pieHandle, PIE_GroupNumber_6, PIE_InterruptSource_SPIARX);
CPU_enableInt(obj->cpuHandle, CPU_IntNumber_6); // enable SCI CPU interrupt
}and finally, the ISRs amended:
static inline void HAL_initIntVectorTable(HAL_Handle handle)
{
HAL_Obj *obj = (HAL_Obj *) handle;
PIE_Obj *pie = (PIE_Obj *) obj->pieHandle;
ENABLE_PROTECTED_REGISTER_WRITE_MODE;
pie->ADCINT1 = &mainISR;
pie->SPIRXINTA = &spiFIFORX_ISR;
DISABLE_PROTECTED_REGISTER_WRITE_MODE;
return;
} // end of HAL_initIntVectorTable() functionMy ISR routine then consists:
interrupt void spiFIFORX_ISR(void)
{
HAL_Obj *obj = (HAL_Obj *) m_HalHandle;
fifostatus = SPI_getRxFifoStatus(obj->spiaHandle); //for debug only
lastvalue = HAL_readSPIdword(m_HalHandle); //redirects to {return SPI_read(obj->spiaHandle);}
HAL_ackSpiRxInt(m_HalHandle);
}I'm at a bit of a loss to understand why I get absolutely nothing, but the ISR is firing, but nothing in the RXBuffer. Any clues anyone?
Mat
GPIO_Number_17
