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Rework rs9116 spi communication to use spidrv and clean up semaphore …
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…logic (project-chip#25834)
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@jmartinez-silabs @mwswartwout
jmartinez-silabs authored and mwswartwout committed Mar 28, 2023
1 parent e82767b commit 46234aa
Showing 1 changed file with 69 additions and 170 deletions.
239 changes: 69 additions & 170 deletions examples/platform/silabs/efr32/rs911x/hal/efx_spi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -57,22 +57,21 @@
#endif

StaticSemaphore_t xEfxSpiIntfSemaBuffer;
static SemaphoreHandle_t spi_sem;
static SemaphoreHandle_t spiTransferLock;
static TaskHandle_t spiInitiatorTaskHandle = NULL;

#if defined(EFR32MG12)
#include "sl_spidrv_exp_config.h"
extern SPIDRV_Handle_t sl_spidrv_exp_handle;
#endif

#if defined(EFR32MG24)
#define SPI_HANDLE sl_spidrv_exp_handle
#elif defined(EFR32MG24)
#include "sl_spidrv_eusart_exp_config.h"
extern SPIDRV_Handle_t sl_spidrv_eusart_exp_handle;
#define SPI_HANDLE sl_spidrv_eusart_exp_handle
#else
#error "Unknown platform"
#endif

static unsigned int tx_dma_channel;
static unsigned int rx_dma_channel;

static uint32_t dummy_data; /* Used for DMA - when results don't matter */
extern void rsi_gpio_irq_cb(uint8_t irqnum);
//#define RS911X_USE_LDMA

Expand Down Expand Up @@ -137,20 +136,8 @@ void sl_wfx_host_reset_chip(void)
****************************************************************/
void rsi_hal_board_init(void)
{
spi_sem = xSemaphoreCreateBinaryStatic(&xEfxSpiIntfSemaBuffer);
xSemaphoreGive(spi_sem);

/* Assign DMA channel from Handle*/
#if defined(EFR32MG12)
/* MG12 + rs9116 combination uses USART driver */
tx_dma_channel = sl_spidrv_exp_handle->txDMACh;
rx_dma_channel = sl_spidrv_exp_handle->rxDMACh;

#elif defined(EFR32MG24)
/* MG24 + rs9116 combination uses EUSART driver */
tx_dma_channel = sl_spidrv_eusart_exp_handle->txDMACh;
rx_dma_channel = sl_spidrv_eusart_exp_handle->rxDMACh;
#endif
spiTransferLock = xSemaphoreCreateBinaryStatic(&xEfxSpiIntfSemaBuffer);
xSemaphoreGive(spiTransferLock);

/* GPIO INIT of MG12 & MG24 : Reset, Wakeup, Interrupt */
WFX_RSI_LOG("RSI_HAL: init GPIO");
Expand All @@ -163,115 +150,24 @@ void rsi_hal_board_init(void)
}

/*****************************************************************************
*@fn static bool dma_complete_cb(unsigned int channel, unsigned int sequenceNo, void *userParam)
*
*@brief
* DMA transfer completion callback. Called by the DMA interrupt handler.
* This is being set in the tx/rx of the DMA
*
* @param[in] channel:
* @param[in] sequenceNO: sequence number
* @param[in] userParam :user parameter
* Spi dma transfer is complete Callback
* Notify the task that initiated the SPI transfer that it is completed.
* The callback needs is a SPIDRV_Callback_t function pointer type
* @param[in] pxHandle: spidrv instance handle
* @param[in] transferStatus: Error code linked to the completed spi transfer. As master, the return code is irrelevant
* @param[in] lCount: number of bytes transferred.
*
* @return
* None
******************************************************************************/
static bool dma_complete_cb(unsigned int channel, unsigned int sequenceNo, void * userParam)
static void spi_dmaTransfertComplete(SPIDRV_HandleData_t * pxHandle, Ecode_t transferStatus, int itemsTransferred)
{
configASSERT(spiInitiatorTaskHandle != NULL);
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
// uint8_t *buf = (void *)userParam;

(void) channel;
(void) sequenceNo;
(void) userParam;

// WFX_RSI_LOG ("SPI: DMA done [%x,%x,%x,%x]", buf [0], buf [1], buf [2], buf [3]);
xSemaphoreGiveFromISR(spi_sem, &xHigherPriorityTaskWoken);
vTaskNotifyGiveFromISR(spiInitiatorTaskHandle, &xHigherPriorityTaskWoken);
spiInitiatorTaskHandle = NULL;
portYIELD_FROM_ISR(xHigherPriorityTaskWoken);

#if defined(SL_CATALOG_POWER_MANAGER_PRESENT)
sl_power_manager_remove_em_requirement(SL_POWER_MANAGER_EM1);
#endif

return true;
}

/*************************************************************
* @fn static void receiveDMA(uint8_t *rx_buf, uint16_t xlen)
* @brief
* RX buf was specified
* TX buf was not specified by caller - so we
* transmit dummy data (typically 0)
* @param[in] rx_buf:
* @param[in] xlen:
* @return
* None
*******************************************************************/
static void receiveDMA(uint8_t * rx_buf, uint16_t xlen)
{
/*
* The caller wants to receive data -
* The xmit can be dummy data (no src increment for tx)
*/
dummy_data = 0;
#if defined(SL_CATALOG_POWER_MANAGER_PRESENT)
sl_power_manager_add_em_requirement(SL_POWER_MANAGER_EM1);
#endif

// Start receive DMA
DMADRV_PeripheralMemory(rx_dma_channel, MY_USART_RX_SIGNAL, (void *) rx_buf, (void *) &(MY_USART->RXDATA), true, xlen,
dmadrvDataSize1, dma_complete_cb, NULL);

// Start transmit DMA.
DMADRV_MemoryPeripheral(tx_dma_channel, MY_USART_TX_SIGNAL, (void *) &(MY_USART->TXDATA), (void *) &(dummy_data), false, xlen,
dmadrvDataSize1, NULL, NULL);
}

/*****************************************************************************
*@fn static void transmitDMA(void *rx_buf, void *tx_buf, uint8_t xlen)
*@brief
* we have a tx_buf. There are some instances where
* a rx_buf is not specifed. If one is specified then
* the caller wants results (auto increment src)
* @param[in] rx_buf:
* @param[in] tx_buf:
* @param[in] xlen:
* @return
* None
******************************************************************************/
static void transmitDMA(uint8_t * rx_buf, uint8_t * tx_buf, uint16_t xlen)
{
void * buf;
bool srcinc;
/*
* we have a tx_buf. There are some instances where
* a rx_buf is not specifed. If one is specified then
* the caller wants results (auto increment src)
* TODO - the caller specified 8/32 bit - we should use this
* instead of dmadrvDataSize1 always
*/
if (rx_buf == NULL)
{
buf = &dummy_data;
srcinc = false;
}
else
{
buf = rx_buf;
srcinc = true;
/* DEBUG */ rx_buf[0] = 0xAA;
rx_buf[1] = 0x55;
}
#if defined(SL_CATALOG_POWER_MANAGER_PRESENT)
sl_power_manager_add_em_requirement(SL_POWER_MANAGER_EM1);
#endif

// Start receive DMA
DMADRV_PeripheralMemory(rx_dma_channel, MY_USART_RX_SIGNAL, buf, (void *) &(MY_USART->RXDATA), srcinc, xlen, dmadrvDataSize1,
dma_complete_cb, buf);
// Start transmit DMA.
DMADRV_MemoryPeripheral(tx_dma_channel, MY_USART_TX_SIGNAL, (void *) &(MY_USART->TXDATA), (void *) tx_buf, true, xlen,
dmadrvDataSize1, NULL, NULL);
}

/*********************************************************************
Expand All @@ -287,57 +183,60 @@ static void transmitDMA(uint8_t * rx_buf, uint8_t * tx_buf, uint16_t xlen)
**************************************************************************/
int16_t rsi_spi_transfer(uint8_t * tx_buf, uint8_t * rx_buf, uint16_t xlen, uint8_t mode)
{
// WFX_RSI_LOG ("SPI: Xfer: tx=%x,rx=%x,len=%d",(uint32_t)tx_buf, (uint32_t)rx_buf, xlen);
if (xlen > MIN_XLEN)
if (xlen <= MIN_XLEN || (tx_buf == NULL && rx_buf == NULL)) // at least one buffer needs to be provided
{
MY_USART->CMD = USART_CMD_CLEARRX | USART_CMD_CLEARTX;
if (xSemaphoreTake(spi_sem, portMAX_DELAY) != pdTRUE)
{
return RSI_FALSE;
}
if (tx_buf == NULL)
{
receiveDMA(rx_buf, xlen);
}
else
{
transmitDMA(rx_buf, tx_buf, xlen);
}
return RSI_ERROR_INVALID_PARAM;
}

/*
* receiveDMA() and transmitDMA() are asynchronous
* Our application design assumes that this function is synchronous
* To make it synchronous, we wait to re-acquire the semaphore before exiting this function
* dma_complete_cb() gives back the semaphore when the SPI transfer is done
*/
if (xSemaphoreTake(spi_sem, pdMS_TO_TICKS(RSI_SEM_BLOCK_MIN_TIMER_VALUE_MS)) == pdTRUE)
{
// Transfer complete
// Give back the semaphore before exiting, so that it may be re-acquired
// in this function, just before the next transfer
xSemaphoreGive(spi_sem);
}
// Temporary patch
// Sometimes the xSemaphoreTake() above is getting stuck indefinitely
// As a workaround, if the transfer is not done within RSI_SEM_BLOCK_MIN_TIMER_VALUE_MS
// stop and start it again
// No need to re-acquire the semaphore since this is the function that acquired it
// TODO: Remove this after a permanent solution is found to the problem of the transfer getting stuck
else
(void) mode; // currently not used;
rsi_error_t rsiError = RSI_ERROR_NONE;

if (xSemaphoreTake(spiTransferLock, portMAX_DELAY) != pdTRUE)
{
return RSI_ERROR_SPI_BUSY;
}

configASSERT(spiInitiatorTaskHandle == NULL); // No other task should currently be waiting for the dma completion
spiInitiatorTaskHandle = xTaskGetCurrentTaskHandle();

Ecode_t spiError;
if (tx_buf == NULL) // Rx operation only
{
spiError = SPIDRV_MReceive(SPI_HANDLE, rx_buf, xlen, spi_dmaTransfertComplete);
}
else if (rx_buf == NULL) // Tx operation only
{
spiError = SPIDRV_MTransmit(SPI_HANDLE, tx_buf, xlen, spi_dmaTransfertComplete);
}
else // Tx and Rx operation
{
spiError = SPIDRV_MTransfer(SPI_HANDLE, tx_buf, rx_buf, xlen, spi_dmaTransfertComplete);
}

if (spiError == ECODE_EMDRV_SPIDRV_OK)
{
// rsi implementation expect a synchronous operation
// wait for the notification that the dma completed in a block state.
// it does not consume any CPU time.
if (ulTaskNotifyTake(pdTRUE, RSI_SEM_BLOCK_MIN_TIMER_VALUE_MS) != pdPASS)
{
uint32_t ldma_flags = 0;
uint32_t rem_len = 0;
rem_len = LDMA_TransferRemainingCount(RSI_LDMA_TRANSFER_CHANNEL_NUM);
LDMA_StopTransfer(RSI_LDMA_TRANSFER_CHANNEL_NUM);
ldma_flags = LDMA_IntGet();
LDMA_IntClear(ldma_flags);
receiveDMA(rx_buf, rem_len);
if (xSemaphoreTake(spi_sem, portMAX_DELAY) == pdTRUE)
{
xSemaphoreGive(spi_sem);
}
int itemsTransferred = 0;
int itemsRemaining = 0;
SPIDRV_GetTransferStatus(SPI_HANDLE, &itemsTransferred, &itemsRemaining);
WFX_RSI_LOG("SPI transfert timed out %d/%d (rx%x rx%x)", itemsTransferred, itemsRemaining, (uint32_t) tx_buf,
(uint32_t) rx_buf);

SPIDRV_AbortTransfer(SPI_HANDLE);
rsiError = RSI_ERROR_SPI_TIMEOUT;
}
}
else
{
WFX_RSI_LOG("SPI transfert failed with err:%x (tx%x rx%x)", spiError, (uint32_t) tx_buf, (uint32_t) rx_buf);
rsiError = RSI_ERROR_SPI_FAIL;
spiInitiatorTaskHandle = NULL; // SPI operation failed. No notification to received.
}

return RSI_ERROR_NONE;
xSemaphoreGive(spiTransferLock);
return rsiError;
}

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