Other Parts Discussed in Thread: HALCOGEN
Tool/software:
I think I have trouble configuring SPI to communicate with TPS65381AQDAPRQ1. I believe I have configured everything as it should be but it is not working...
I have placed SPI configuration in _c_int00 function just before call of main() , configuration code looks like this.
uint32_t i = 3000000;
for(;i>0;) {
i--;
}
/* Return control and status register values to default */
mibspiREG2->GCR0 = 0u;
/* Bring MIBSPI channel out of reset */
mibspiREG2->GCR0 = 1u;
/* Data format 0 */
mibspiREG2->FMT0 = (uint32)((uint32)0U << 24U) /* wdelay */
| (uint32)((uint32)0U << 23U) /* parity Polarity */
| (uint32)((uint32)0U << 22U) /* parity enable */
| (uint32)((uint32)0U << 21U) /* wait on enable */
| (uint32)((uint32)0U << 20U) /* shift direction */
| (uint32)((uint32)0U << 17U) /* clock polarity */
| (uint32)((uint32)0U << 16U) /* clock phase */
| (uint32)((uint32)19 << 8U) /* baudrate prescale - derive SPICLK from VCLK
@note: the clock rate (MHz) for data format x can be calculated: VCLK (80MHz) / (PRESCALEx + 1) */
| (uint32)((uint32)16U << 0U); /* data word length */
/* Initialize port - set pins as functional */
mibspiREG2->PC0 = 0u;
mibspiREG2->PC0 = mibspiREG2->PC0
| (uint32)((uint32)1U << 25U) /* SOMI[1] */
| (uint32)((uint32)1U << 17U) /* SIMO[1] */
| (uint32)((uint32)1U << 11U) /* SOMI[0] */
| (uint32)((uint32)1U << 10U) /* SIMO[0] */
| (uint32)((uint32)1U << 9U) /* CLK */
| (uint32)((uint32)0U << 8U) /* ENA */
| (uint32)((uint32)1U << 5U) /* SCS[5] */
| (uint32)((uint32)1U << 4u) /* SCS[4] */
| (uint32)((uint32)1U << 3u) /* SCS[3] */
| (uint32)((uint32)1U << 2u) /* SCS[2] */
| (uint32)((uint32)1U << 1u) /* SCS[1] */
| (uint32)((uint32)1U << 0u); /* SCS[0] */
/* Chosen SPI start in master mode */
mibspiREG2->GCR1 = mibspiREG2->GCR1
| (uint32_t)((uint32_t)1U << 24U) /* SPIEN */
| (uint32_t)((uint32_t)0U << 16U) /* LOOPBACK */
| (uint32_t)((uint32_t)0U << 8U) /* POWERDOWN */
| (uint32_t)((uint32_t)1U << 1U) /* CLKMOD */
| (uint32_t)((uint32_t)1U << 0U); /* MASTER */
uint8_t chip_select = 0xFD;
while(((mibspiREG2->BUF) & 0x20000000) != 0u){
/* wait for the TXFULL bit to be reset before writing new data to SPIDAT1 register
* @note: 0 - transmit buffer is empty, ready to accept a new data
* 1 - transmit buffer is full, not ready to accept new data */
}
mibspiREG2->DAT1 = ((uint32_t)0U << 28u)
| ((uint32_t)63U << 26u)
| ((uint32_t)0U << 24u)
| ((uint32_t)chip_select << 16u)
| ((uint32_t)49152U);
while(((mibspiREG2->BUF) & 0x80000000u) != 0u){
/* wait for the RXEMPTY bit to be reset before reading the SPIBUF register
* @note: 0 - new data has been received and copied into RXDATA
* 1 - no data has been received since the last read of RXDATA */
}
PMIC_VAL = (uint32_t)mibspiREG2->BUF;
Looking at signals with oscilloscope seems like CS is not working as I thought it will. TPS65381 requires between messages from us to deactivate CS. My understanding was that CS deactivates to default state after every message unless CS_hold was set, which for me is not . Just to note for now SPI is intended to be used in compatibility mode but further down the road we will transition to MiBSPI.
Can you tell me what I might be doing wrong here that I can't communicate properly with TPS65381AQDAPRQ1 .
