#include "stm32_spi.h"

__IO uint32_t TIMEOUT=LONG_TIMEOUT;
/***********************************************
调用方式： SPI_Inital()
SDO   --->   PA5
CS    --->   PB6
SCLK  --->   PA5
SDI   --->   PA7
DRDY  --->   PB6
返回值：  
函数说明：MAX31865 硬件spi初始化
************************************************/
void  SPI_Inital(void)
{
 SPI_InitTypeDef  SPI_InitStructure;
 GPIO_InitTypeDef  GPIO_InitStructure; 
// GPIO
 RCC_APB2PeriphClockCmd(SPI_GPIO_CLK, ENABLE);
 RCC_APB2PeriphClockCmd(SPI_CS_GPIO_CLK, ENABLE);

 /*!< SPI Periph clock enable */
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
 
 /*!< GPIO configuration */  
 /*!< Configure SPI pins */
 GPIO_InitStructure.GPIO_Pin = SPI_SCK|SPI_MOSI|SPI_MISO;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
 GPIO_Init(MAX31865_SPI_PORT, &GPIO_InitStructure);
 
 /*!< Configure SPI pin: CS */
 GPIO_InitStructure.GPIO_Pin = SPI_CS;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
 GPIO_Init(MAX31865_IO_PORT, &GPIO_InitStructure);  
 //set CS high
	GPIO_SetBits(MAX31865_IO_PORT, SPI_CS); 
 /*!< SPI configuration */
 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
 SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
 SPI_InitStructure.SPI_DataSize =SPI_DataSize_8b;
 SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
 SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
 SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
 SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
 SPI_InitStructure.SPI_CRCPolynomial = 7;
 /* SPI Peripheral Enable */
 SPI_Cmd(SPI1, ENABLE);
 /* Apply SPI configuration after enabling it */
 SPI_Init(SPI1, &SPI_InitStructure);
}
/***********************************************
调用方式： SPI_Write()
返回值：  
函数说明：SPI写数据
************************************************/
uint8_t SPI_Write(uint8_t *buffer, uint8_t nBytes)
{
  uint8_t i;
  for(i=0;i<nBytes;i++){
       TIMEOUT = LONG_TIMEOUT;
       while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){  //not empty
                if((TIMEOUT--) == 0) return (1);
             }
       SPI_I2S_SendData(SPI1,buffer[i]);
       TIMEOUT = LONG_TIMEOUT;
       while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){     
               if((TIMEOUT--) == 0) return (1);
            }
       SPI_I2S_ReceiveData(SPI1);  
     }
  return(0);
}
/***********************************************
调用方式： SPI_Read()
返回值：  
函数说明：SPI读数据
************************************************/
uint8_t SPI_Read(uint8_t *buffer, uint8_t nBytes)
{
  uint8_t i;
  SPI_I2S_ReceiveData(SPI1);
  for(i=0;i<nBytes;i++)
     {
       TIMEOUT = LONG_TIMEOUT;
       while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){  //not empty
               if((TIMEOUT--) == 0) return (1);
             }
       SPI_I2S_SendData(SPI1,0x00);
       TIMEOUT = LONG_TIMEOUT;
       while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){
               if((TIMEOUT--) == 0) return (1);
            }
       buffer[i]= SPI_I2S_ReceiveData(SPI1);
     }
  return(0);
}
/***********************************************
调用方式： SPI_WriteByte()
返回值：  
函数说明：SPI字节写数据
************************************************/
uint8_t SPI_WriteByte(uint8_t data)
{
	 TIMEOUT = LONG_TIMEOUT;
	 while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){  //not empty
						if((TIMEOUT--) == 0) return (1);
				 }
	 SPI_I2S_SendData(SPI1,data);
	 TIMEOUT = LONG_TIMEOUT;
	 while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){
					 if((TIMEOUT--) == 0) return (1);
				}
	 SPI_I2S_ReceiveData(SPI1);
	 SPI_I2S_ReceiveData(SPI1);
	 return(0);
}
/***********************************************
调用方式： SPI_WriteByte()
返回值：  
函数说明：SPI字节读数据
************************************************/
uint8_t SPI_ReadByte(void)
{
	SPI_I2S_ReceiveData(SPI1);
	while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);  //not empty	
	SPI_I2S_SendData(SPI1,0xff);
	while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); 
	return (SPI_I2S_ReceiveData(SPI1));
}
/***********************************************
调用方式： Set_DRDY_Pin_INPUT()
返回值：  
函数说明：MAX31865 DRDY输入IO配置
************************************************/
void Set_DRDY_Pin_INPUT(void)
{
   GPIO_InitTypeDef  GPIO_InitStructure;
   
   RCC_APB2PeriphClockCmd(DRDY_GPIO_CLK, ENABLE); 
   GPIO_InitStructure.GPIO_Pin = DRDY_PIN;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
   GPIO_Init(MAX31865_IO_PORT, &GPIO_InitStructure);      
}
/***********************************************
调用方式： DRDY_Pin_Value()
返回值：  
函数说明： 读MAX31865  DRDY_Pin_Value高低电平
************************************************/
uint8_t DRDY_Pin_Value(void)
{
   return(GPIO_ReadOutputDataBit(MAX31865_IO_PORT, DRDY_PIN));      
}