Phần này mình sẽ thử hoạt động của module SPI.
Trên KIT mình có thì thẻ nhớ được gắn với SPI1 theo sơ đồ
![](http://vidieukhien.org/wp-content/uploads/2020/01/fig1-17.png)
Trong project sử dụng Timer để tạo delay
File delay.h
#ifndef DELAY_H_ #define DELAY_H_ #include "stm32f10x.h" void Delay_Init(void); void Delay_Us(uint32_t u32DelayInUs); void Delay_Ms(uint32_t u32DelayInMs); #endif
File delay.c
#include "delay.h" static void Timer_Init(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; uint16_t PrescalerValue = 0; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); PrescalerValue = (uint16_t) (SystemCoreClock / 1000000) - 1; /* Time base configuration */ TIM_TimeBaseStructure.TIM_Period = 0xFFFF; TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); /* TIM3 enable counter */ TIM_Cmd(TIM3, ENABLE); } void Delay_Init(void) { Timer_Init(); } void Delay_Us(uint32_t u32DelayInUs) { TIM_SetCounter(TIM3, 0); while(TIM_GetCounter(TIM3) < u32DelayInUs); } void Delay_Ms(uint32_t u32DelayInMs) { while (u32DelayInMs) { Delay_Us(1000); --u32DelayInMs; } }
Thư viện SPI
File spi.h
#ifndef SPI_H_ #define SPI_H_ #include "stm32f10x.h" void My_SPI_Init(void); uint8_t My_SPI_Exchange(uint8_t u8Data); #endif
File spi.c
#include "spi.h" void My_SPI_Init(void) { GPIO_InitTypeDef gpioInit; SPI_InitTypeDef SPI_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); gpioInit.GPIO_Mode=GPIO_Mode_AF_PP; gpioInit.GPIO_Speed=GPIO_Speed_50MHz; gpioInit.GPIO_Pin=GPIO_Pin_5 | GPIO_Pin_7; GPIO_Init(GPIOA, &gpioInit); gpioInit.GPIO_Mode=GPIO_Mode_Out_PP; gpioInit.GPIO_Speed=GPIO_Speed_50MHz; gpioInit.GPIO_Pin=GPIO_Pin_4; GPIO_Init(GPIOA, &gpioInit); GPIO_SetBits(GPIOA, GPIO_Pin_4); gpioInit.GPIO_Mode=GPIO_Mode_IN_FLOATING; gpioInit.GPIO_Speed=GPIO_Speed_50MHz; gpioInit.GPIO_Pin=GPIO_Pin_6; GPIO_Init(GPIOA, &gpioInit); 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_Low; SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStructure.SPI_CRCPolynomial = 7; SPI_Init(SPI1, &SPI_InitStructure); SPI_Cmd(SPI1, ENABLE); } uint8_t My_SPI_Exchange(uint8_t u8Data) { SPI_I2S_SendData(SPI1, u8Data); while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET) { } return SPI_I2S_ReceiveData(SPI1); }
File main.c
#include "stm32f10x.h" #include "delay.h" #include "spi.h" void My_GPIO_Init(void); int main() { Delay_Init(); My_SPI_Init(); My_GPIO_Init(); while(1) { GPIO_SetBits(GPIOC, GPIO_Pin_13); Delay_Ms(100); GPIO_ResetBits(GPIOA, GPIO_Pin_4); My_SPI_Exchange(0x19); GPIO_SetBits(GPIOA, GPIO_Pin_4); GPIO_ResetBits(GPIOC, GPIO_Pin_13); Delay_Ms(100); GPIO_ResetBits(GPIOA, GPIO_Pin_4); My_SPI_Exchange(0x86); GPIO_SetBits(GPIOA, GPIO_Pin_4); } } void My_GPIO_Init(void) { GPIO_InitTypeDef gpioInit; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); gpioInit.GPIO_Mode=GPIO_Mode_Out_PP; gpioInit.GPIO_Speed=GPIO_Speed_50MHz; gpioInit.GPIO_Pin=GPIO_Pin_13; GPIO_Init(GPIOC, &gpioInit); }
Kết quả khi chạy chương trình
![](http://vidieukhien.org/wp-content/uploads/2020/01/fig2-10.png)
Project
https://drive.google.com/open?id=14RfkcCk8VCFRjIfTEDACS_0PaxmuMdnM