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Implement changes to SPI interfaces

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This commit is contained in:
Henrik Stickann
2022-04-19 23:22:04 +02:00
parent a468133c97
commit 3041499ce0
2 changed files with 140 additions and 51 deletions
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127
src/hal/spi.cpp
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@@ -3,12 +3,26 @@
#ifdef STA_HAL_SPI_ENABLE
#include <sta/assert.hpp>
#include <sta/endian.hpp>
#include <sta/lang.hpp>
#ifdef STA_MCU_LITTLE_ENDIAN
# define STA_HAL_SPI_REVERSE_BIT_ORDER SpiBitOrder::MSB
#elif STA_MCU_BIG_ENDIAN
# define STA_HAL_SPI_REVERSE_BIT_ORDER SpiBitOrder::LSB
#else // !STA_MCU_LITTLE_ENDIAN && !STA_MCU_BIG_ENDIAN
# ifdef STA_HAL_SPI_REVERSE_BIT_ORDER
# warning "Internal STA_HAL_SPI_REVERSE_BIT_ORDER macro manually defined! Better now what you are doing!!!"
# else // !STA_HAL_SPI_REVERSE_BIT_ORDER
# error "Unknown endian-ness. Define STA_MCU_LITTLE_ENDIAN or STA_MCU_BIG_ENDIAN in <sta/config.hpp>"
# endif // !STA_HAL_SPI_REVERSE_BIT_ORDER
#endif // !STA_MCU_LITTLE_ENDIAN && !STA_MCU_BIG_ENDIAN
namespace sta
{
static SpiSettings getHalSpiSettings(SPI_HandleTypeDef * handle)
static SpiSettings getHalSpiSettings(SPI_HandleTypeDef * handle, uint32_t pclkFreq)
{
SpiSettings settings;
@@ -16,43 +30,35 @@ namespace sta
(handle->Init.CLKPolarity == SPI_POLARITY_LOW) ? SpiClkPolarity::LOW : SpiClkPolarity::HIGH,
(handle->Init.CLKPhase == SPI_PHASE_1EDGE) ? SpiClkPhase::EDGE_1 : SpiClkPhase::EDGE_2
);
settings.dataSize = (handle->Init.DataSize == SPI_DATASIZE_8BIT) ? SpiDataSize::BIT_8 : SpiDataSize::BIT_16;
settings.dataSize = (handle->Init.DataSize == SPI_DATASIZE_8BIT) ? SpiDataSize::SIZE_8 : SpiDataSize::SIZE_16;
settings.bitOrder = (handle->Init.FirstBit == SPI_FIRSTBIT_MSB) ? SpiBitOrder::MSB : SpiBitOrder::LSB;
uint32_t prescaler = 1;
switch (handle->Init.BaudRatePrescaler)
{
case SPI_BAUDRATEPRESCALER_2:
settings.baudRatePrescaler = SpiBaudRatePrescaler::BRP_2;
prescaler = 2;
break;
case SPI_BAUDRATEPRESCALER_4:
settings.baudRatePrescaler = SpiBaudRatePrescaler::BRP_4;
prescaler = 2;
prescaler = 4;
break;
case SPI_BAUDRATEPRESCALER_8:
settings.baudRatePrescaler = SpiBaudRatePrescaler::BRP_8;
prescaler = 2;
prescaler = 8;
break;
case SPI_BAUDRATEPRESCALER_16:
settings.baudRatePrescaler = SpiBaudRatePrescaler::BRP_16;
prescaler = 2;
prescaler = 16;
break;
case SPI_BAUDRATEPRESCALER_32:
settings.baudRatePrescaler = SpiBaudRatePrescaler::BRP_32;
prescaler = 2;
prescaler = 32;
break;
case SPI_BAUDRATEPRESCALER_64:
settings.baudRatePrescaler = SpiBaudRatePrescaler::BRP_64;
prescaler = 2;
prescaler = 64;
break;
case SPI_BAUDRATEPRESCALER_128:
settings.baudRatePrescaler = SpiBaudRatePrescaler::BRP_128;
prescaler = 2;
prescaler = 128;
break;
case SPI_BAUDRATEPRESCALER_256:
settings.baudRatePrescaler = SpiBaudRatePrescaler::BRP_256;
prescaler = 2;
prescaler = 256;
break;
default:
// Unreachable case
@@ -60,29 +66,62 @@ namespace sta
STA_UNREACHABLE();
}
settings.clkSpeed = HAL_RCC_GetSysClockFreq() / prescaler;
// SPI clock speed is based of PCLK
settings.clkSpeed = pclkFreq / prescaler;
return settings;
}
HalSpiInterface::HalSpiInterface(SPI_HandleTypeDef * handle, Mutex * mutex /* = nullptr */)
: SpiInterface(getHalSpiSettings(handle), mutex), handle_{handle}
HalSpiInterface::HalSpiInterface(const HalSpiInterfaceInfo & info, Mutex * mutex /* = nullptr */)
: SpiInterface(mutex), info_{info}
{
STA_ASSERT(handle != nullptr);
STA_ASSERT(info.handle != nullptr);
STA_ASSERT(info.getPCLKFreq != nullptr);
}
void HalSpiInterface::transfer(uint8_t data)
void HalSpiInterface::transfer(uint8_t value)
{
HAL_SPI_Transmit(handle_, &data, 1, HAL_MAX_DELAY);
if (settings().dataSize == SpiDataSize::SIZE_8)
{
HAL_SPI_Transmit(info_.handle, &value, 1, HAL_MAX_DELAY);
}
else
{
// Required since tx buffer is cast to uint16_t * internally
uint16_t dummy = value;
HAL_SPI_Transmit(info_.handle, reinterpret_cast<uint8_t *>(&dummy), 1, HAL_MAX_DELAY);
}
}
void HalSpiInterface::transfer16(uint16_t value)
{
static_assert(sizeof(value) == 2, "Unexpected uint16_t size");
uint16_t size = 1;
// Send as two bytes if data size is 8-bit
if (settings().dataSize == SpiDataSize::SIZE_8)
{
size = 2;
if (settings().bitOrder == STA_HAL_SPI_REVERSE_BIT_ORDER)
{
// Reverse byte order from internal representation
value = STA_UINT16_SWAP_BYTE_ORDER(value);
}
}
HAL_SPI_Transmit(info_.handle, reinterpret_cast<uint8_t *>(&value), size, HAL_MAX_DELAY);
}
void HalSpiInterface::transfer(const uint8_t * buffer, size_t size)
{
STA_ASSERT(buffer != nullptr);
STA_ASSERT(size != 0);
HAL_SPI_Transmit(handle_, const_cast<uint8_t *>(buffer), size, HAL_MAX_DELAY);
HAL_SPI_Transmit(info_.handle, const_cast<uint8_t *>(buffer), size, HAL_MAX_DELAY);
}
void HalSpiInterface::transfer(const uint8_t * txBuffer, uint8_t * rxBuffer, size_t size)
@@ -91,15 +130,14 @@ namespace sta
STA_ASSERT(rxBuffer != nullptr);
STA_ASSERT(size != 0);
HAL_SPI_TransmitReceive(handle_, const_cast<uint8_t *>(txBuffer), rxBuffer, size, HAL_MAX_DELAY);
HAL_SPI_TransmitReceive(info_.handle, const_cast<uint8_t *>(txBuffer), rxBuffer, size, HAL_MAX_DELAY);
}
void HalSpiInterface::transfer16(uint16_t value)
void HalSpiInterface::receive(uint8_t * buffer, size_t size)
{
static_assert(sizeof(uint16_t) == 2, "Unexpected uint16_t size");
STA_ASSERT(buffer != nullptr);
HAL_SPI_Transmit(handle_, reinterpret_cast<uint8_t *>(&value), 2, HAL_MAX_DELAY);
HAL_SPI_Receive(info_.handle, buffer, size, HAL_MAX_DELAY);
}
@@ -107,33 +145,36 @@ namespace sta
{
STA_ASSERT(count != 0);
for (size_t i = 0; i < count; ++i)
if (settings().dataSize == SpiDataSize::SIZE_8)
{
transfer(value);
for (size_t i = 0; i < count; ++i)
{
HAL_SPI_Transmit(info_.handle, &value, 1, HAL_MAX_DELAY);
}
}
}
void HalSpiInterface::fill32(uint32_t value, size_t count)
{
static_assert(sizeof(uint32_t) == 4, "Unexpected uint32_t size");
STA_ASSERT(count != 0);
for (size_t i = 0; i < count; ++i)
else
{
HAL_SPI_Transmit(handle_, reinterpret_cast<uint8_t *>(&value), 4, HAL_MAX_DELAY);
// Required since tx buffer is cast to uint16_t * internally
uint16_t dummy = value;
for (size_t i = 0; i < count; ++i)
{
HAL_SPI_Transmit(info_.handle, reinterpret_cast<uint8_t *>(&dummy), 1, HAL_MAX_DELAY);
}
}
}
void HalSpiInterface::receive(uint8_t * buffer, size_t size)
const SpiSettings & HalSpiInterface::settings() const
{
STA_ASSERT(buffer != nullptr);
// Cache settings
static SpiSettings settings = getHalSpiSettings(info_.handle, info_.getPCLKFreq());
HAL_SPI_Receive(handle_, buffer, size, HAL_MAX_DELAY);
return settings;
}
HalSpiDevice::HalSpiDevice(SpiInterface * intf, HalGpioPin csPin)
: SpiDevice(intf), csPin_{csPin}
{}