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本示例基于stm32f103外设固件库开发的AD7091驱动程序,内涵初始化和AD获取操作代码
#include "ad7091.h"
#include "delay.h"
/**
* @brief Select AD7091: Chip Select pin low
*/
#define AD7091_CS_LOW() GPIO_ResetBits(AD7091_CS_GPIO_PORT, AD7091_CS_PIN)
/**
* @brief Deselect AD7091: Chip Select pin high
*/
#define AD7091_CS_HIGH() GPIO_SetBits(AD7091_CS_GPIO_PORT, AD7091_CS_PIN)
/**
* @brief Select AD7091: Chip CONVST pin low
*/
#define AD7091_CONVST_LOW() GPIO_ResetBits(AD7091_CONVST_GPIO_PORT, AD7091_CONVST_PIN)
/**
* @brief Deselect AD7091: Chip CONVST pin high
*/
#define AD7091_CONVST_HIGH() GPIO_SetBits(AD7091_CONVST_GPIO_PORT, AD7091_CONVST_PIN)
#define AD7091_DUMMY_BYTE 0xffff
uint16_t AD7091_SendByte(uint16_t byte)
{
/*!< Loop while DR register in not emplty */
while (SPI_I2S_GetFlagStatus(AD7091_SPI, SPI_I2S_FLAG_TXE) == RESET);
/*!< Send byte through the SPI1 peripheral */
SPI_I2S_SendData(AD7091_SPI, byte);
/*!< Wait to receive a byte */
while (SPI_I2S_GetFlagStatus(AD7091_SPI, SPI_I2S_FLAG_RXNE) == RESET);
/*!< Return the byte read from the SPI bus */
return SPI_I2S_ReceiveData(AD7091_SPI);
}
uint16_t AD7091_ReadByte(void)
{
return (AD7091_SendByte(AD7091_DUMMY_BYTE));
}
void AD7091_LowLevel_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/*!< AD7091_SPI_CS_GPIO, AD7091_SPI_MOSI_GPIO, AD7091_SPI_MISO_GPIO
and AD7091_SPI_SCK_GPIO Periph clock enable */
RCC_APB2PeriphClockCmd(AD7091_CS_GPIO_CLK | AD7091_SPI_MOSI_GPIO_CLK | AD7091_SPI_MISO_GPIO_CLK |
AD7091_SPI_SCK_GPIO_CLK | AD7091_CONVST_GPIO_CLK, ENABLE);
/*!< AD7091_SPI Periph clock enable */
RCC_APB2PeriphClockCmd(AD7091_SPI_CLK, ENABLE);
/*!< Configure AD7091_SPI pins: SCK */
GPIO_InitStructure.GPIO_Pin = AD7091_SPI_SCK_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(AD7091_SPI_SCK_GPIO_PORT, &GPIO_InitStructure);
/*!< Configure AD7091_SPI pins: MOSI */
GPIO_InitStructure.GPIO_Pin = AD7091_SPI_MOSI_PIN;
GPIO_Init(AD7091_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);
/*!< Configure AD7091_SPI pins: MISO */
GPIO_InitStructure.GPIO_Pin = AD7091_SPI_MISO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(AD7091_SPI_MISO_GPIO_PORT, &GPIO_InitStructure);
/*!< Configure AD7091_CS_PIN pin: AD7091 Card CS pin */
GPIO_InitStructure.GPIO_Pin = AD7091_CS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(AD7091_CS_GPIO_PORT, &GPIO_InitStructure);
/*!< Configure AD7091_CONVST_PIN pin: AD7091 Card CONVST pin */
GPIO_InitStructure.GPIO_Pin = AD7091_CONVST_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(AD7091_CONVST_GPIO_PORT, &GPIO_InitStructure);
}
uint16_t AD7091_GetSmpNormal(void)
{
#if 1
uint16_t adc_smp;
AD7091_CONVST_HIGH();
AD7091_CONVST_LOW();
AD7091_CONVST_HIGH();
//delay<=650ns
delay_us(1);
AD7091_CS_LOW();
adc_smp = AD7091_ReadByte();
AD7091_CS_HIGH();
return (adc_smp>>4);
#else
uint16_t adc_smp;
AD7091_CONVST_LOW();
//delay>=10ns FIXME
AD7091_CONVST_HIGH();
//delay<=650ns
delay_us(1);
AD7091_CS_LOW();
adc_smp = AD7091_ReadByte();
AD7091_CS_HIGH();
return (adc_smp>>4);
#endif
}
uint16_t AD7091_GetSmpPowerDown(void)
{
uint16_t adc_smp;
AD7091_CONVST_HIGH();
delay_us(100);
AD7091_CONVST_LOW();
delay_us(1);
AD7091_CS_LOW();
adc_smp = AD7091_ReadByte();
AD7091_CS_HIGH();
return (adc_smp>>4);
}
void AD7091_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
AD7091_LowLevel_Init();
/*!< Deselect the FLASH: Chip Select high */
AD7091_CS_HIGH();
AD7091_CONVST_HIGH();
/*!< SPI configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(AD7091_SPI, &SPI_InitStructure);
/*!< Enable the AD7091_SPI */
SPI_Cmd(AD7091_SPI, ENABLE);
}