You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
407 lines
11 KiB
407 lines
11 KiB
/*
|
|
* upstream_spi.c
|
|
*
|
|
* Created on: 21/06/2015
|
|
* Author: Robert Fisk
|
|
*/
|
|
|
|
#include <upstream_interface_def.h>
|
|
#include <upstream_spi.h>
|
|
#include "stm32f4xx_hal.h"
|
|
#include "usbd_def.h"
|
|
#include "board_config.h"
|
|
|
|
|
|
|
|
SPI_HandleTypeDef Hspi1;
|
|
UpstreamPacketTypeDef UpstreamPacket0;
|
|
UpstreamPacketTypeDef UpstreamPacket1;
|
|
UpstreamPacketTypeDef* CurrentWorkingPacket;
|
|
UpstreamPacketTypeDef* NextTxPacket; //Indicates we have a pending TX packet
|
|
|
|
InterfaceStateTypeDef UpstreamInterfaceState;
|
|
FreePacketCallbackTypeDef PendingFreePacketCallback; //Indicates someone is waiting for a packet buffer to become available
|
|
SpiPacketReceivedCallbackTypeDef ReceivePacketCallback; //Indicates someone is waiting for a received packet
|
|
|
|
uint8_t SentCommandClass;
|
|
uint8_t SentCommand;
|
|
|
|
|
|
static void SPI1_Init(void);
|
|
static HAL_StatusTypeDef Upstream_CheckBeginPacketReception(void);
|
|
static void Upstream_BeginPacketReception(UpstreamPacketTypeDef* freePacket);
|
|
|
|
|
|
|
|
void Upstream_InitSPI(void)
|
|
{
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_RESET;
|
|
|
|
SPI1_Init();
|
|
UpstreamPacket0.Busy = NOT_BUSY;
|
|
UpstreamPacket1.Busy = NOT_BUSY;
|
|
NextTxPacket = NULL;
|
|
PendingFreePacketCallback = NULL;
|
|
ReceivePacketCallback = NULL;
|
|
|
|
//Todo: check connection to downstream, await client USB insertion
|
|
|
|
while (!DOWNSTREAM_TX_OK_ACTIVE);
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_IDLE;
|
|
}
|
|
|
|
|
|
void SPI1_Init(void)
|
|
{
|
|
Hspi1.Instance = SPI1;
|
|
Hspi1.State = HAL_SPI_STATE_RESET;
|
|
Hspi1.Init.Mode = SPI_MODE_MASTER;
|
|
Hspi1.Init.Direction = SPI_DIRECTION_2LINES;
|
|
Hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
|
|
Hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
|
|
Hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
|
|
Hspi1.Init.NSS = SPI_NSS_SOFT;
|
|
Hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32; //42MHz APB2 / 32 = 1.3Mbaud
|
|
Hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
|
|
Hspi1.Init.TIMode = SPI_TIMODE_DISABLED;
|
|
Hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_ENABLED;
|
|
Hspi1.Init.CRCPolynomial = SPI_CRC_DEFAULTPOLYNOMIAL;
|
|
HAL_SPI_Init(&Hspi1);
|
|
}
|
|
|
|
|
|
|
|
//Used by USB interface classes, and by our internal RX code.
|
|
HAL_StatusTypeDef Upstream_GetFreePacket(FreePacketCallbackTypeDef callback)
|
|
{
|
|
//Sanity checks
|
|
if ((UpstreamInterfaceState < UPSTREAM_INTERFACE_IDLE) ||
|
|
(UpstreamInterfaceState > UPSTREAM_INTERFACE_RX_PACKET))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
|
|
//Do we already have a queued callback?
|
|
if (PendingFreePacketCallback != NULL)
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
|
|
//Check if there is a free buffer now
|
|
if (UpstreamPacket0.Busy == NOT_BUSY)
|
|
{
|
|
UpstreamPacket0.Busy = BUSY;
|
|
callback(&UpstreamPacket0);
|
|
return HAL_OK;
|
|
}
|
|
if (UpstreamPacket1.Busy == NOT_BUSY)
|
|
{
|
|
UpstreamPacket1.Busy = BUSY;
|
|
callback(&UpstreamPacket1);
|
|
return HAL_OK;
|
|
}
|
|
|
|
//Otherwise save requested address for when a buffer becomes free in the future
|
|
PendingFreePacketCallback = callback;
|
|
return HAL_OK;
|
|
}
|
|
|
|
|
|
UpstreamPacketTypeDef* Upstream_GetFreePacketImmediately(void)
|
|
{
|
|
//Sanity checks
|
|
if ((UpstreamInterfaceState < UPSTREAM_INTERFACE_IDLE) ||
|
|
(UpstreamInterfaceState > UPSTREAM_INTERFACE_RX_PACKET))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
|
|
//We are expecting a free buffer now
|
|
if (UpstreamPacket0.Busy == NOT_BUSY)
|
|
{
|
|
UpstreamPacket0.Busy = BUSY;
|
|
return &UpstreamPacket0;
|
|
}
|
|
if (UpstreamPacket1.Busy == NOT_BUSY)
|
|
{
|
|
UpstreamPacket1.Busy = BUSY;
|
|
return &UpstreamPacket1;
|
|
}
|
|
|
|
//Should not happen:
|
|
SPI_INTERFACE_FREAKOUT_NO_RETURN;
|
|
}
|
|
|
|
|
|
//Used by USB interface classes, and by our internal RX code.
|
|
void Upstream_ReleasePacket(UpstreamPacketTypeDef* packetToRelease)
|
|
{
|
|
FreePacketCallbackTypeDef tempCallback;
|
|
|
|
if ((packetToRelease != &UpstreamPacket0) &&
|
|
(packetToRelease != &UpstreamPacket1))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
|
|
if (PendingFreePacketCallback != NULL)
|
|
{
|
|
tempCallback = PendingFreePacketCallback; //In extreme situations, running this callback can trigger another request for a free packet,
|
|
PendingFreePacketCallback = NULL; //thereby causing GetFreePacket to freak out. So we need to clear the callback indicator first.
|
|
tempCallback(packetToRelease);
|
|
}
|
|
else
|
|
{
|
|
packetToRelease->Busy = NOT_BUSY;
|
|
}
|
|
}
|
|
|
|
|
|
//Used by USB interface classes only.
|
|
//OK to call when still transmitting another packet.
|
|
//Not OK to call when receiving or waiting for downstream reply,
|
|
//as we can't let the size/packet sequence get out of sync.
|
|
HAL_StatusTypeDef Upstream_TransmitPacket(UpstreamPacketTypeDef* packetToWrite)
|
|
{
|
|
//Sanity checks
|
|
if ((packetToWrite != &UpstreamPacket0) &&
|
|
(packetToWrite != &UpstreamPacket1))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
if ((packetToWrite->Busy != BUSY) ||
|
|
(packetToWrite->Length < UPSTREAM_PACKET_LEN_MIN) ||
|
|
(packetToWrite->Length > UPSTREAM_PACKET_LEN))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
if (NextTxPacket != NULL)
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
|
|
switch (UpstreamInterfaceState)
|
|
{
|
|
case UPSTREAM_INTERFACE_TX_SIZE_WAIT:
|
|
case UPSTREAM_INTERFACE_TX_SIZE:
|
|
case UPSTREAM_INTERFACE_TX_PACKET_WAIT:
|
|
case UPSTREAM_INTERFACE_TX_PACKET:
|
|
NextTxPacket = packetToWrite;
|
|
break;
|
|
|
|
case UPSTREAM_INTERFACE_IDLE:
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_TX_SIZE_WAIT;
|
|
CurrentWorkingPacket = packetToWrite;
|
|
SentCommandClass = CurrentWorkingPacket->CommandClass;
|
|
SentCommand = CurrentWorkingPacket->Command;
|
|
break;
|
|
|
|
default:
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
return HAL_OK;
|
|
}
|
|
|
|
|
|
|
|
//Called at the end of the SPI TX DMA transfer,
|
|
//at DMA2 interrupt priority. Assume *hspi points to our hspi1.
|
|
void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef *hspi)
|
|
{
|
|
SPI1_NSS_DEASSERT;
|
|
|
|
if ((UpstreamInterfaceState != UPSTREAM_INTERFACE_TX_SIZE) &&
|
|
(UpstreamInterfaceState != UPSTREAM_INTERFACE_TX_PACKET))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
|
|
if (UpstreamInterfaceState == UPSTREAM_INTERFACE_TX_SIZE)
|
|
{
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_TX_PACKET_WAIT;
|
|
return;
|
|
}
|
|
|
|
if (UpstreamInterfaceState == UPSTREAM_INTERFACE_TX_PACKET)
|
|
{
|
|
if ((PendingFreePacketCallback != NULL) && (NextTxPacket == NULL))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
|
|
Upstream_ReleasePacket(CurrentWorkingPacket);
|
|
if (NextTxPacket != NULL)
|
|
{
|
|
//NextTxPacket has already passed the checks in Upstream_TransmitPacket.
|
|
//So we just need to pass it to HAL_SPI_Transmit_DMA.
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_TX_SIZE_WAIT;
|
|
CurrentWorkingPacket = NextTxPacket;
|
|
NextTxPacket = NULL;
|
|
return;
|
|
}
|
|
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_IDLE;
|
|
if (ReceivePacketCallback != NULL)
|
|
{
|
|
Upstream_CheckBeginPacketReception();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//Used by USB interface classes.
|
|
//Ok to call when idle or transmitting.
|
|
//Not OK to call when receiving or waiting for downstream reply.
|
|
HAL_StatusTypeDef Upstream_ReceivePacket(SpiPacketReceivedCallbackTypeDef callback)
|
|
{
|
|
if (ReceivePacketCallback != NULL)
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
|
|
ReceivePacketCallback = callback;
|
|
return Upstream_CheckBeginPacketReception();
|
|
}
|
|
|
|
|
|
//Internal use only.
|
|
HAL_StatusTypeDef Upstream_CheckBeginPacketReception(void)
|
|
{
|
|
if ((UpstreamInterfaceState < UPSTREAM_INTERFACE_IDLE) ||
|
|
(UpstreamInterfaceState > UPSTREAM_INTERFACE_RX_SIZE_WAIT))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_HAL_ERROR;
|
|
}
|
|
|
|
if (UpstreamInterfaceState == UPSTREAM_INTERFACE_IDLE)
|
|
{
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_RX_SIZE_WAIT;
|
|
}
|
|
return HAL_OK;
|
|
}
|
|
|
|
|
|
//This is called by EXTI3 falling edge interrupt,
|
|
//indicating that downstream is ready for the next transaction.
|
|
void Upstream_TxOkInterrupt(void)
|
|
{
|
|
switch (UpstreamInterfaceState)
|
|
{
|
|
case UPSTREAM_INTERFACE_TX_SIZE_WAIT:
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_TX_SIZE;
|
|
SPI1_NSS_ASSERT;
|
|
if (HAL_SPI_Transmit_DMA(&Hspi1,
|
|
(uint8_t*)&CurrentWorkingPacket->Length,
|
|
2) != HAL_OK)
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
break;
|
|
|
|
case UPSTREAM_INTERFACE_TX_PACKET_WAIT:
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_TX_PACKET;
|
|
SPI1_NSS_ASSERT;
|
|
if ((HAL_SPI_Transmit_DMA(&Hspi1,
|
|
&CurrentWorkingPacket->CommandClass,
|
|
CurrentWorkingPacket->Length)) != HAL_OK)
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
break;
|
|
|
|
case UPSTREAM_INTERFACE_RX_SIZE_WAIT:
|
|
Upstream_GetFreePacket(Upstream_BeginPacketReception);
|
|
break;
|
|
|
|
case UPSTREAM_INTERFACE_RX_PACKET_WAIT:
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_RX_PACKET;
|
|
SPI1_NSS_ASSERT;
|
|
if ((HAL_SPI_Receive_DMA(&Hspi1,
|
|
&CurrentWorkingPacket->CommandClass,
|
|
(CurrentWorkingPacket->Length + 1))) != HAL_OK) //"When the CRC feature is enabled the pData Length must be Size + 1"
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
}
|
|
|
|
|
|
//Internal use only.
|
|
//Called when we want to receive downstream packet, and a packet buffer has become free.
|
|
void Upstream_BeginPacketReception(UpstreamPacketTypeDef* freePacket)
|
|
{
|
|
if (UpstreamInterfaceState != UPSTREAM_INTERFACE_RX_SIZE_WAIT)
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_RX_SIZE;
|
|
CurrentWorkingPacket = freePacket;
|
|
CurrentWorkingPacket->Length = 0; //Our RX buffer is used by HAL_SPI_Receive_DMA as dummy TX data, we set Length to 0 so downstream will know this is a dummy packet.
|
|
SPI1_NSS_ASSERT;
|
|
if (HAL_SPI_Receive_DMA(&Hspi1,
|
|
(uint8_t*)&CurrentWorkingPacket->Length,
|
|
(2 + 1)) != HAL_OK) //"When the CRC feature is enabled the pData Length must be Size + 1"
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
}
|
|
|
|
|
|
//Called at the end of the SPI RX DMA transfer,
|
|
//at DMA2 interrupt priority. Assume *hspi points to our hspi1.
|
|
void HAL_SPI_RxCpltCallback(SPI_HandleTypeDef *hspi)
|
|
{
|
|
SpiPacketReceivedCallbackTypeDef tempPacketCallback;
|
|
|
|
SPI1_NSS_DEASSERT;
|
|
|
|
if ((UpstreamInterfaceState != UPSTREAM_INTERFACE_RX_SIZE) &&
|
|
(UpstreamInterfaceState != UPSTREAM_INTERFACE_RX_PACKET))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
|
|
if (UpstreamInterfaceState == UPSTREAM_INTERFACE_RX_SIZE)
|
|
{
|
|
if ((CurrentWorkingPacket->Length < UPSTREAM_PACKET_LEN_MIN) ||
|
|
(CurrentWorkingPacket->Length > UPSTREAM_PACKET_LEN))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_RX_PACKET_WAIT;
|
|
return;
|
|
}
|
|
|
|
if (UpstreamInterfaceState == UPSTREAM_INTERFACE_RX_PACKET)
|
|
{
|
|
UpstreamInterfaceState = UPSTREAM_INTERFACE_IDLE;
|
|
if (((SentCommandClass != (CurrentWorkingPacket->CommandClass & COMMAND_CLASS_MASK)) &&
|
|
(SentCommandClass != COMMAND_CLASS_ERROR)) ||
|
|
(SentCommand != CurrentWorkingPacket->Command))
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
if (ReceivePacketCallback == NULL)
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|
|
//USB interface may want to receive another packet immediately,
|
|
//so clear ReceivePacketCallback before the call.
|
|
//It is the callback's responsibility to release the packet buffer we are passing to it!
|
|
tempPacketCallback = ReceivePacketCallback;
|
|
ReceivePacketCallback = NULL;
|
|
tempPacketCallback(CurrentWorkingPacket);
|
|
}
|
|
}
|
|
|
|
|
|
//Something bad happened! Possibly CRC error...
|
|
void HAL_SPI_ErrorCallback(SPI_HandleTypeDef *hspi)
|
|
{
|
|
SPI_INTERFACE_FREAKOUT_RETURN_VOID;
|
|
}
|