OSStatus spi_init( spi_driver_t* spi_driver, SPI_MemMapPtr spi_peripheral, uint32_t baud_rate_bps, uint8_t chip_select, bool polarity, bool phase, bool use_dma )
{
uint8_t br = get_baud_rate_scaler_register_value( baud_rate_bps );
spi_driver->spi_peripheral = spi_peripheral;
spi_driver->baud_rate_bps = baud_rate_bps;
spi_driver->chip_select = chip_select;
spi_driver->polarity = polarity;
spi_driver->phase = phase;
spi_driver->use_dma = use_dma;
/* Enable SPI peripheral clock */
set_spi_peripheral_clock( spi_peripheral, true );
/* Enable SPI peripheral and clean up (stop) any previous transfer
* MDIS = 0 to enable
* HALT = 1 to stop transfer
* MSTR = 1 for master mode
* DCONF = 0 for SPI
* PCSIS[x] = 1 for CS active low
*/
SPI_MCR_REG( spi_peripheral ) &= ~(uint32_t) ( SPI_MCR_MDIS_MASK | SPI_MCR_DCONF(0) );
SPI_MCR_REG( spi_peripheral ) |= (uint32_t) ( (0x1<<24)|SPI_MCR_HALT_MASK | SPI_MCR_MSTR_MASK | SPI_MCR_PCSIS( 1 << chip_select ) );
/* Select Clock and Transfer Attributes Register (CTAR). Always use CTAR0 */
SPI_PUSHR_REG( spi_peripheral ) &= ~(uint32_t) SPI_PUSHR_CTAS(CTAR_REG_USED);
/* Reset Clock and Transfer Attributes (CTAR) register */
SPI_CTAR_REG( spi_peripheral, CTAR_REG_USED ) = 0;
/* Set SPI configuration
* FMSZ = 7. Set frame size to 8-bit. frame size = FMSZ + 1
* CPOL = phase
* CPHA = polarity
* DBR = 00
* PBR = 2
* BR = calculate based on baud_rate_Mbps
* PCSSCK = 0
* PASC = 0
* PDT = 0
* CSSCK = BR - 1
* ASC = BR - 1
* DT = 0
*/
SPI_CTAR_REG( spi_peripheral, CTAR_REG_USED ) |= (uint32_t) ( SPI_CTAR_CPOL_MASK & (uint32_t)( polarity << SPI_CTAR_CPOL_SHIFT ) ) |
(uint32_t) ( SPI_CTAR_CPHA_MASK & (uint32_t)( phase << SPI_CTAR_CPHA_SHIFT ) ) |
(uint32_t) ( SPI_CTAR_FMSZ( 8 - 1 ) ) |
(uint32_t) ( SPI_CTAR_DBR_MASK & ( DOUBLE_BAUD_RATE << SPI_CTAR_DBR_SHIFT ) ) |
(uint32_t) ( SPI_CTAR_PBR( CTAR_PBR ) ) |
(uint32_t) ( SPI_CTAR_BR( br ) ) |
(uint32_t) ( SPI_CTAR_CSSCK( br - 1 ) ) |
(uint32_t) ( SPI_CTAR_ASC( br - 1 ) );
clear_spi_fifos( spi_peripheral );
/* Enable the start transfer bit */
SPI_MCR_REG( spi_peripheral ) &= ~(uint32_t) ( SPI_MCR_HALT_MASK );
if(use_dma)
{
SPI_RSER_REG( spi_peripheral ) |= (0x3<<24)|(0x3<<16);
DMA_init();
}
spi_status_print(spi_peripheral);
return kNoErr;
}
//=========================================================================
//函数名称：spi_init
//函数参数：spin：SPI通道号。
// Master:是否是主机。
//函数返回：无
//功能概要：SPI初始化。
//=========================================================================
void spi_init(SPIn spin,SPI_CFG master)
{
//使能SPI模块时钟，配置SPI引脚功能
if(spin == 0)
{
SIM_SCGC6 |= SIM_SCGC6_DSPI0_MASK;
//PORTA_PCR14 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK;//PCS0 //DSE=1:输出时高驱动能力
PORTA_PCR15 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK;//SCK
PORTA_PCR16 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK;//SOUT
PORTA_PCR17 = 0 | PORT_PCR_MUX(0x2);//SIN
}
else if(spin == 1)
{
SIM_SCGC6 |= SIM_SCGC6_SPI1_MASK;
PORTE_PCR1 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; //SOUT
PORTE_PCR2 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; //SCK
PORTE_PCR3 = 0 | PORT_PCR_MUX(0x2); //SIN
PORTE_PCR4 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; //PCS0
}
else
{
SIM_SCGC3 |= SIM_SCGC3_SPI2_MASK;
PORTD_PCR13 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; //SOUT
PORTD_PCR12 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; //SCK
PORTD_PCR14 = 0 | PORT_PCR_MUX(0x2)/* | PORT_PCR_DSE_MASK*/; //SIN
//PORTD_PCR15 = 0 | PORT_PCR_MUX(0x2)/* | PORT_PCR_DSE_MASK*/; //PCS1
}
SPI_MCR_REG(SPIN[spin]) = 0
| SPI_MCR_CLR_TXF_MASK //Clear the Tx FIFO counter.
| SPI_MCR_CLR_RXF_MASK //Clear the Rx FIFO counter.
//| SPI_MCR_PCSIS_MASK
| SPI_MCR_HALT_MASK;
//根据主从机模式设置工作模式。MCU提供最大主机频率是1/2主频，最大从机频率是1/4主频
if(master == MASTER)
{
SPI_MCR_REG(SPIN[spin]) = (0
| SPI_MCR_MSTR_MASK //Master,主机模式
// | SPI_MCR_PCSIS(2) //PCS1
);
SPI_CTAR_REG(SPIN[spin],0) = (0
//| SPI_CTAR_DBR_MASK //双波特率 ，这里设 DBR=1，CPHA=1，PBR=00，得SCK Duty Cycle 为 50/50
//| SPI_CTAR_CPHA_MASK //数据在SCK上升沿改变（输出），在下降沿被捕捉（输入读取）。如果是0，则反之。 w25x16在上升沿读取数据；NRF24L01在上升沿读取数据
| SPI_CTAR_PBR(1) //波特率分频器 ，0~3 对应的分频值Prescaler为 2、3、5、7
| SPI_CTAR_PDT(0x00) //延时因子为 PDT*2+1 ，这里PDT为3，即延时因子为7。PDT为2bit
| SPI_CTAR_BR(0) //波特率计数器值 ,当BR<=3,分频Scaler 为 2*（BR+1） ，当BR>=3，分频Scaler 为 2^BR 。BR为4bit
//SCK 波特率 = (fSYS/Prescaler) x [(1+DBR)/Scaler ] fSYS 为 Bus clock
// 100M 2 1 2 = 50M 这里以最大的来算
// 100M 5 1 2 =20M
//| SPI_CTAR_CPOL_MASK //时钟极性，1表示 SCK 不活跃状态为高电平, NRF24L01 不活跃为低电平
| SPI_CTAR_FMSZ(0x07) //每帧传输 7bit+1 ，即8bit （FMSZ默认就是8）
// | SPI_CTAR_LSBFE_MASK //1为低位在前。
//| SPI_CTAR_CSSCK(1) //
//|SPI_CTAR_PCSSCK(2) //设置片选信号有效到时钟第一个边沿出现的延时的预分频值。tcsc延时预分频 2*x+1；
);
//LSBFE 为 0 ，数据在前
}
else
{
//默认从机模式
SPI_CTAR_SLAVE_REG(SPIN[spin],0) = 0
| SPI_CTAR_SLAVE_FMSZ(0x07)
| SPI_CTAR_SLAVE_CPOL_MASK
| SPI_CTAR_SLAVE_CPHA_MASK;
}
//DELAY_MS(100);
/************* 清标志位 ***************/
SPI_SR_REG(SPIN[spin]) = (SPI_SR_EOQF_MASK //End of Queue Flag，发送队列空了，发送完毕
| SPI_SR_TFUF_MASK //Transmit FIFO Underflow Flag，传输FIFO下溢标志位，SPI为从机模式，Tx FIFO为空，而外部SPI主机模式启动传输，标志位就会置1，写1清0
| SPI_SR_TFFF_MASK //Transmit FIFO Fill Flag，传输FIFO满标志位。 写1或者DMA控制器发现传输FIFO满了就会清0。 0表示Tx FIFO满了
| SPI_SR_RFOF_MASK //Receive FIFO Overflow Flag，接收FIFO溢出标志位。
| SPI_SR_RFDF_MASK); //Receive FIFO Drain Flag，接收FIFO损耗标志位，写1或者DMA控制器发现传输FIFO空了就会清0。0表示Rx FIFO空
SPI_MCR_REG(SPIN[spin]) &= ~SPI_MCR_HALT_MASK; //启动SPI传输。1为暂停，0为启动
DELAY_MS(1);
}
/******************************************************
* Function Definitions
******************************************************/
static void spi_status_print(SPI_MemMapPtr p)
{
printf("MCR %x, TCR %x, CTAR %x, SR %x, RSER %x PUSHR %x\r\n",
SPI_MCR_REG(p), SPI_TCR_REG(p), SPI_CTAR_REG( p, CTAR_REG_USED ), SPI_SR_REG(p), SPI_RSER_REG(p),SPI_PUSHR_REG(p));
}
/*
*******************************************************************************
* void SpiSetDelayAfterPDT( SPI_MemMapPtr base , uint8_t delay)
*******************************************************************************
* Input : base : Pointer to SPI0/ SPI1 /SPI2 Register Base
* delay : Selects the Delay after Transfer Prescaler value
* Output : void
* Description : Set delay after transfer prescaler value for SPI
*******************************************************************************
*/
void SpiSetDelayAfterPDT( SPI_MemMapPtr base , uint8_t delay)
{
SPI_CTAR_REG(base,0) |= SPI_CTAR_PDT(delay);
}//End of SpiSetDelayAfterPDT
/**
* @brief SPI初始化
*
* @param spino SPI通道号
* @param master 是否是主机
*
* @return E_ID 输入序号错误
* @return E_OK 初始化正常
*/
ER spi_init(uint8_t spino, uint8_t master)
{
if((spino < 0) || (spino > SPI_NO_GET(SPI2)))
{
return (E_ID);
}
SPI_MemMapPtr base_addr = spi_get_base_address(spino);
/* 使能SPI模块时钟，配置SPI引脚功能 */
if(SPI_MOD_SET(spino) == SPI0)
{
SIM_SCGC6 |= SIM_SCGC6_DSPI0_MASK;
/* PORT_PCR_MUX(0x2) ： SPI功能
* PORT_PCR_DSE_MASK ： Drive Strength Enable */
gpio_init(PORT_NO_GET(SD_CS), PIN_NO_GET(SD_CS), OUT_PUT, HIGH_POWER); /* PCS0 */
PORTA_PCR15 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; /* SCK */
PORTA_PCR16 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; /* SOUT */
PORTA_PCR17 = 0 | PORT_PCR_MUX(0x2); /* SIN */
}
else if(SPI_MOD_SET(spino) == SPI1)
{
SIM_SCGC6 |= SIM_SCGC6_SPI1_MASK;
PORTE_PCR4 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; /* PCS0 */
PORTE_PCR2 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; /* SCK */
PORTE_PCR1 = 0 | PORT_PCR_MUX(0x2) | PORT_PCR_DSE_MASK; /* SOUT */
PORTE_PCR3 = 0 | PORT_PCR_MUX(0x2); /* SIN */
}
else
{
SIM_SCGC3 |= SIM_SCGC3_SPI2_MASK;
}
SPI_MCR_REG(base_addr) = 0
| SPI_MCR_CLR_TXF_MASK /* Clear the Tx FIFO counter. */
| SPI_MCR_CLR_RXF_MASK /* Clear the Rx FIFO counter. */
| SPI_MCR_HALT_MASK; /* Starts and stops DSPI transfers */
/* 根据主从机模式设置工作模式 */
if(master == MASTER)
{
SPI_MCR_REG(base_addr) |= SPI_MCR_MSTR_MASK; /* Master/Slave Mode Select */
SPI_CTAR_REG(base_addr,0) = 0
| SPI_CTAR_DBR_MASK /* Double Baud Rate */
| SPI_CTAR_FMSZ(0x07) /* Frame Size： 8bit */
| SPI_CTAR_PDT_MASK /* 延时因子为7 */
| SPI_CTAR_BR(0x8); /* Selects the scaler value for the baud rate. */
//| SPI_CTAR_CPOL_MASK; /* Clock Polarity */
//| SPI_CTAR_CPHA_MASK; /* Clock Phase */
}
else
{
SPI_CTAR_SLAVE_REG(base_addr,0) = 0
| SPI_CTAR_SLAVE_FMSZ(0x07)
| SPI_CTAR_SLAVE_CPOL_MASK
| SPI_CTAR_SLAVE_CPHA_MASK;
}
SPI_SR_REG(base_addr) = SPI_SR_EOQF_MASK /* End of Queue Flag */
| SPI_SR_TFUF_MASK /* Transmit FIFO Underflow Flag */
| SPI_SR_TFFF_MASK /* Transmit FIFO Fill Flag */
| SPI_SR_RFOF_MASK /* Receive FIFO Overflow Flag */
| SPI_SR_RFDF_MASK; /* Receive FIFO Drain Flag */
SPI_MCR_REG(base_addr) &= ~SPI_MCR_HALT_MASK; /* start */
return (E_OK);
}
/*
*******************************************************************************
* void SpiSetDelayAfterCS( SPI_MemMapPtr base , uint8_t delay)
*******************************************************************************
* Input : base : Pointer to SPI0/ SPI1 /SPI2 Register Base
* delay : Selects the scaler value for the Delay after CS.
* Output : void
* Description : Set After CS Delay for SPI
*******************************************************************************
*/
void SpiSetDelayAfterCS( SPI_MemMapPtr base , uint8_t delay)
{
SPI_CTAR_REG(base,0) |= SPI_CTAR_CSSCK(delay);
}//End of SpiSetDelayAfterPCS
/*
*******************************************************************************
* void SpiSetFrameSize( SPI_MemMapPtr base , uint8_t frame_size)
*******************************************************************************
* Input : base : Pointer to SPI0/ SPI1 /SPI2 Register Base
* frame_size : Number of bits transmitted -1
* Output : void
* Description : Set Frame Size for SPI
*******************************************************************************
*/
void SpiSetFrameSize( SPI_MemMapPtr base , uint8_t frame_size)
{
SPI_CTAR_REG(base,0)= SPI_CTAR_FMSZ(frame_size);
}//End of SpiSetFrameSize
/*
*******************************************************************************
* void SpiSetShiftPriority( SPI_MemMapPtr base , uint8_t shift_priority)
*******************************************************************************
* Input : base : Pointer to SPI0/ SPI1 /SPI2 Register Base
* shift_priority: 0=> Data is transferred MSB first.
1=>Data is transferred LSB first.
* Output : void
* Description : Set Shift priority for SPI
*******************************************************************************
*/
void SpiSetShiftPriority( SPI_MemMapPtr base , uint8_t shift_priority)
{
SPI_CTAR_REG(base,0) |= (shift_priority<<SPI_CTAR_LSBFE_SHIFT );
}//End of SpiSetShiftPriority
/*
*******************************************************************************
* void SpiSetClockPolarity( SPI_MemMapPtr base , uint8_t clock_polarity )
*******************************************************************************
* Input : base : Pointer to SPI0/ SPI1 /SPI2 Register Base
* clock_polarity: 0=> The inactive state value of SCK is low.
1=> The inactive state value of SCK is high.
* Output : void
* Description : Set Clock Polarity for SPI
*******************************************************************************
*/
void SpiSetClockPolarity( SPI_MemMapPtr base , uint8_t clock_polarity)
{
SPI_CTAR_REG(base,0) |= (clock_polarity <<SPI_CTAR_CPOL_SHIFT );
}//End of SpiSetClockPolarity
/*
*******************************************************************************
* void SpiSetClockPhase( SPI_MemMapPtr base , uint8_t clock_phase )
*******************************************************************************
* Input : base : Pointer to SPI0/ SPI1 /SPI2 Register Base
* clock_phase : 0=>Data is captured on the leading edge of SCK
* and changed on the following edge.
1=>Data is changed on the leading edge of SCK
and captured on the following edge.
* Output : void
* Description : Set Clock Phase for SPI
*******************************************************************************
*/
void SpiSetClockPhase( SPI_MemMapPtr base , uint8_t clock_phase)
{
SPI_CTAR_REG(base,0) |= (clock_phase <<SPI_CTAR_CPHA_SHIFT );
}//End of SpiSetClockPhase
