SPI
支持4个SPI 其中2个在HCPU(SPI1,SPI2), 2个在LCPU(SPI3,SPI4).
主要功能
提供单收、单发、同时收发3种模式，每种模式均支持轮询、中断、DMA3种方法
可配置项
master/slave
收发共用数据线，或者收发分2根数据线
数据宽度 支持8bit/16bit.
时钟极性、数据采样沿
帧格式 支持Motorola* Serial Peripheral Interface (SPI)， Texas Instruments* Synchronous Serial Protocol (SSP) National Semiconductor Microwire
示例1
SPI1 做master, 发送1000字节的数据
static void spi1_send_example(void)
{
SPI_HandleTypeDef spi_Handle = {0};
uint32_t baundRate = 1200000;
uint8_t * txBuff = 0x2000c000;
uint32_t txBuffLenInBytes = 1000;
uint32_t tx_timeout_tick = 5000;
rt_uint32_t SPI_APB_CLOCK = HAL_RCC_GetPCLKFreq(CORE_ID_HCPU, 1);
spi_Handle.Instance = SPI1;
spi_Handle.Init.Direction = SPI_DIRECTION_2LINES;
spi_Handle.Init.Mode = SPI_MODE_MASTER;
spi_Handle.Init.DataSize = SPI_DATASIZE_8BIT;
spi_Handle.Init.CLKPhase = SPI_PHASE_1EDGE;
spi_Handle.Init.CLKPolarity = SPI_POLARITY_HIGH;
spi_Handle.Init.BaudRatePrescaler = (SPI_APB_CLOCK + baundRate / 2) / baundRate;
spi_Handle.Init.FrameFormat = SPI_FRAME_FORMAT_SPI;
spi_Handle.State = HAL_SPI_STATE_RESET;
HAL_NVIC_SetPriority(SPI1_IRQn, 0, 0);
NVIC_EnableIRQ(SPI1_IRQn);
if (HAL_SPI_Init(&spi_Handle) == HAL_OK)
{
if(HAL_OK == HAL_SPI_Transmit(&spi_Handle, txBuff, txBuffLenInBytes, tx_timeout_tick))
{
//Transmit done.
}
}
NVIC_DisableIRQ(SPI1_IRQn);
}