第一次編寫STM32程序,有很多問題請教,我想把MAX6675的SO的數據讀出來轉換成實際溫度,用串口工具讀出來。 是不是還有哪些沒配置好?小弟剛開始弄這個,着急用,在此感謝了!
- #include "sys.h"
- #include "delay.h"
- #include "usart.h"
- #define SPI1_CS_Pin GPIO_PIN_4
- void Delay(__IO uint32_t nCount);
- void Delay(__IO uint32_t nCount)
- {
- while(nCount--){}
- }
- int main(void)
- {
- uint16_t GetData=0;
- uint16_t Temperature = 0;
- uint16_t T = 0;
- GPIO_InitTypeDef GPIO_A; //定義一個GPIO_InitTypeDef的結構體GPIO_A
- SPI_HandleTypeDef hspi1; //SPI句柄
- HAL_Init(); //初始化HAL庫
- Stm32_Clock_Init(360,25,2,8); uart_init(115200); //初始化USART
- __HAL_RCC_SPI1_CLK_ENABLE(); //開啓SP1時鐘
- __HAL_RCC_USART1_CLK_ENABLE();
- __HAL_RCC_GPIOA_CLK_ENABLE(); //開啓GPIOA時鐘
- GPIO_A.Pin = GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;
- GPIO_A.Mode = GPIO_MODE_AF_PP; //複用推輓輸出
- GPIO_A.Pull=GPIO_PULLUP; //上拉
- GPIO_A.Speed = GPIO_SPEED_LOW; //2MHz
- GPIO_A.Alternate = GPIO_AF5_SPI1;
- HAL_GPIO_Init(GPIOA,&GPIO_A); //上面爲配置參數,此處啓動初始化
- GPIO_A.Pin=SPI1_CS_Pin; //配置PA4(CS片選信號)
- GPIO_A.Mode=GPIO_MODE_OUTPUT_PP; //推輓輸出
- GPIO_A.Speed = GPIO_SPEED_LOW; //2MHz
- HAL_GPIO_Init(GPIOA,&GPIO_A); //上面爲配置參數,此處啓動初始化
- HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4,GPIO_PIN_SET); // 先把片選拉高,真正用的時候再拉低
- hspi1.Instance = SPI1;
- hspi1.Init.Mode = SPI_MODE_MASTER; //主模式
- hspi1.Init.Direction = SPI_DIRECTION_2LINES_RXONLY;//SPI設置爲單線接受
- hspi1.Init.DataSize = SPI_DATASIZE_16BIT;//SPI發送接收數據爲16位幀格式
- hspi1.Init.CLKPolarity = SPI_POLARITY_HIGH;//同步時鐘空閒狀態爲 高電平
- hspi1.Init.CLKPhase = SPI_PHASE_2EDGE; //同步時鐘第二個跳變沿數據被採集
- hspi1.Init.NSS = SPI_NSS_SOFT; //NSS信號由軟件控制
- hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256; //波特率預分頻值爲256;
- hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB; //數據傳輸從MSB位開始
- hspi1.Init.TIMode = SPI_TIMODE_DISABLE; //關閉TI模式
- hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE; //關閉CRC
- hspi1.Init.CRCPolynomial = 7; //CRC值計算的多項式
- HAL_SPI_Init(&hspi1); //初始化
- __HAL_SPI_ENABLE(&hspi1); //使能SPI1
- #define SPI1_L HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET);//片選信號拉低爲SPI_L
- #define SPI1_H HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET); //片選信號拉高爲SPI_H
- SPI1_H; //拉高片選,爲後面開啓片選做準備
- while(1)
- {
- SPI1_L; //開啓片選
- HAL_SPI_Receive(&hspi1, (uint8_t*)&GetData, 1, 1000);
- Temperature = (GetData>>3)&0x0fff;
- SPI1_H;
- HAL_Delay(1000);
- T = Temperature*1024/4095;
- printf ("Temperature:%d\n",T);
- }
複製代碼 |