STM32 & TLV5628 SPI 通信
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【中文标题】STM32 & TLV5628 SPI 通信【英文标题】:STM32 & TLV5628 SPI Communication 【发布时间】:2019-06-14 08:38:36 【问题描述】:大家好,感谢您的宝贵时间。
我一直致力于将STM32f446RE Nucleo 板与TLV5628 8 位八进制串行DAC 连接起来。我遇到了多个问题,但当前的问题是以下两件事之一:
1) 显示完全相同信息的数据线和时钟线
或
2) 数据线显示信息,但时钟线上没有。
无论如何,出来的信息是完全不正确的。
这是我的设置代码:
void SPI_INIT(void)
// Enable clocks for C
RCC->AHB1ENR |= RCC_AHB1ENR_GPIOCEN;
// SPI GPIO
GPIOC->MODER |= 2 << 3*2; // PC3 data pin
GPIOC->MODER |= 2 << 7*2; // PC7 clock pin
GPIOC->MODER |= 1 << 2*2; //pc2 load
GPIOC->MODER |= 1 << 4*2; //pc4 ldac - probably set low permanently
// Pins default to push-pull
// set all to high speed
GPIOC->OSPEEDR |= (3 << 2*2) | (3 << 3*2) | (3 << 4*2) | (3 << 7*2);
GPIOC->AFR[0] |= 5<< 6*2; // Alt func 5 pc3 - SPI2
GPIOC->AFR[0] |= 5 << 7*2; // Alt func 5 pc7 - SPI2
// SPI Setup
RCC->APB1ENR |= RCC_APB1ENR_SPI2EN; // Enable SPI Clock
RCC->APB1RSTR |= RCC_APB1RSTR_SPI2RST; // reset SPI2
RCC->APB1RSTR &= ~RCC_APB1RSTR_SPI2RST;// clear the reset
// Control Register 1
SPI2->CR1 &= ~SPI_CR1_SPE; // Disable SPI
SPI2->CR1 |= SPI_CR1_MSTR; // master mode
SPI2->CR1 &= ~SPI_CR1_RXONLY; // transmit, 0 == full duplex
SPI2->CR1 &= ~SPI_CR1_DFF; // 8 bit format
SPI2->CR1 &= ~SPI_CR1_LSBFIRST; // MSB first
SPI2->CR1 &= ~SPI_CR1_CPOL;// low polarity, so 0 when idle
SPI2->CR1 |= 4 << 3; // (180M/4)/32 = 1.41 MHz
SPI2->CR1 |= SPI_CR1_CPHA; // first edge, look in data sheet
//Questionable settings
// Biderectional data line
SPI2->CR1 |= SPI_CR1_BIDIMODE; // 1/17/2019 --> Check to see if this fixes something
SPI2->CR1 |= SPI_CR1_BIDIOE; // idk if i need this
// CRC Polynomial Register
SPI2->CRCPR = 10;
// Control Register 2
SPI2->CR2 |= 1<<2; // SS output enabled
SPI2->CR1 |= SPI_CR1_SPE; // enable, has to be last
这是我的 SPI 写代码:
void SPI_Write(int dacSelect, int adcData)
while((SPI2->SR & SPI_SR_TXE) != 0);
GPIOC->ODR |= 1 << 2; // load set high to read data
SPI2->DR = dacArray[dacSelect]; // send address
SPI2->DR = adcData; // send adc data
while((SPI2->SR & SPI_SR_BSY) == SPI_SR_BSY);
GPIOC->ODR &= ~(1 << 2); // Send load low to load data
Delay(10); // short delay
GPIOC->ODR |= 1 << 2;
【问题讨论】:
【参考方案1】:您可以使用 STMCubeMX 为 STM 微处理器和电路板生成代码。以下代码块是从 STM32ubeMX 为 STM32F4 生成的。您应该更改传感器的波特率。
SPI_HandleTypeDef hspi;
SPI_HandleTypeDef SpiHandle;
void Spi_Initialize(void)
/*##-1- Configure the SPI peripheral #######################################*/
/* Set the SPI parameters */
SpiHandle.Instance = SPI2;
SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
SpiHandle.Init.CLKPhase = SPI_PHASE_1EDGE;
SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW;
SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;
SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
SpiHandle.Init.CRCPolynomial = 7;
SpiHandle.Init.NSS = SPI_NSS_SOFT;
SpiHandle.Init.Mode = SPI_MODE_MASTER;
if(HAL_SPI_Init(&SpiHandle) != HAL_OK)
while(1);
void Spi_Read(void )
uint8_t SpiData[2];
uint8_t tempmessage = 8;
HAL_GPIO_WritePin(GPIOG,GPIO_PIN_8,RESET); // CS pin
HAL_SPI_TransmitReceive(&hspi,&tempmessage,SpiData,2,5000); // Read Data
HAL_GPIO_WritePin(GPIOG,GPIO_PIN_8,SET); // CS Pin
void Spi_Write(uint8_t *Data, uint8_t size)
HAL_GPIO_WritePin(GPIOG,GPIO_PIN_8,RESET); // CS pin
HAL_SPI_Transmit(&hspi, Data, size, 5000); // Write Data
HAL_GPIO_WritePin(GPIOG,GPIO_PIN_8,SET); // CS Pin
【讨论】:
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