314 lines
8.5 KiB
C
314 lines
8.5 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : main.c
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* Author : WCH
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* Version : V1.0.0
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* Date : 2021/06/06
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* Description : Main program body.
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*********************************************************************************
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* Attention: This software (modified or not) and binary are used for
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* microcontroller manufactured by Nanjing Qinheng Microelectronics.
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*******************************************************************************/
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/*
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*@Note
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7-bit addressing mode, master/slave mode, transceiver routine:
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I2C1_SCL(PB8)\I2C1_SDA(PB9).
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This routine demonstrates that Master sends and Slave receives using interrupt.
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Note: The two boards download the Master and Slave programs respectively,
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and power on at the same time.
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Hardware connection:PB8 -- PB8
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PB9 -- PB9
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*/
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#include "debug.h"
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/* I2C Mode Definition */
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#define HOST_MODE 0
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#define SLAVE_MODE 1
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/* I2C Communication Mode Selection */
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#define I2C_MODE HOST_MODE
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//#define I2C_MODE SLAVE_MODE
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/* Global define */
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#define Size 6
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#define RXAdderss 0x02
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#define TxAdderss 0x02
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/* Global Variable */
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u8 TxData[Size] = { 0xA1, 0xB2, 0xC3, 0xD4, 0xE5, 0xF6 };
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u8 RxData[Size] = {0};
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/*
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* 0 - start
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* 1 - After sending the start signal
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* 2 - After sending the write address
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* 3 - End of send data
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* 4 - After sending the repeat start signal
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* 5 - After sending the read address
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* 0xff - end
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* */
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volatile uint8_t master_sate = 0;
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volatile uint16_t master_recv_len = 0;
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volatile uint16_t master_send_len = 0;
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/*
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* 0 - start
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* 0xff - end
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* */
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volatile uint8_t slave_state = 0;
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volatile uint16_t slave_recv_len = 0;
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volatile uint16_t slave_send_len = 0;
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void I2C1_EV_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
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void I2C1_ER_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
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/*********************************************************************
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* @fn IIC_Init
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*
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* @brief Initializes the IIC peripheral.
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*
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* @return none
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*/
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void IIC_Init(u32 bound, u16 address)
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{
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GPIO_InitTypeDef GPIO_InitStructure={0};
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I2C_InitTypeDef I2C_InitTSturcture={0};
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NVIC_InitTypeDef NVIC_InitStructure = {0};
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE );
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GPIO_PinRemapConfig(GPIO_Remap_I2C1, ENABLE);
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RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C1, ENABLE );
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init( GPIOB, &GPIO_InitStructure );
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init( GPIOB, &GPIO_InitStructure );
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I2C_InitTSturcture.I2C_ClockSpeed = bound;
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I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;
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I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_16_9;
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I2C_InitTSturcture.I2C_OwnAddress1 = address;
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I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;
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I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
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I2C_Init( I2C1, &I2C_InitTSturcture );
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I2C_Cmd( I2C1, ENABLE );
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#if (I2C_MODE == HOST_MODE)
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I2C_AcknowledgeConfig( I2C1, ENABLE );
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#endif
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NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init( &NVIC_InitStructure );
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NVIC_InitStructure.NVIC_IRQChannel = I2C1_ER_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init( &NVIC_InitStructure );
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I2C_ITConfig( I2C1, I2C_IT_BUF, ENABLE );
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I2C_ITConfig( I2C1, I2C_IT_EVT, ENABLE );
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I2C_ITConfig( I2C1, I2C_IT_ERR, ENABLE );
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}
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/*********************************************************************
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* @fn main
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*
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* @brief Main program.
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*
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* @return none
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*/
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int main(void)
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{
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u8 i = 0,j = 0;
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Delay_Init();
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USART_Printf_Init( 460800 );
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printf( "SystemClk:%d\r\n", SystemCoreClock );
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printf(__TIME__ "\n");
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#if (I2C_MODE == HOST_MODE)
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printf("IIC Host mode\r\n");
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IIC_Init( 80000, TxAdderss);
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Delay_Ms(1000);
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for (j = 0; j < 3; ++j) {
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while( I2C_GetFlagStatus( I2C1, I2C_FLAG_BUSY ) != RESET );
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I2C_GenerateSTART(I2C1, ENABLE);
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while(master_sate != 0xff);
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printf( "RxData:\r\n" );
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for( i = 0; i < 6; i++ )
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{
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printf( "%02x ", RxData[i] );
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}
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printf("\n");
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// Reset the host state machine
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master_sate = 0;
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master_recv_len = 0;
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master_send_len = 0;
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Delay_Ms(500);
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}
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#elif (I2C_MODE == SLAVE_MODE)
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printf("IIC Slave mode\r\n");
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IIC_Init( 80000, RXAdderss);
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i = 0;
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while(1){
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while(slave_state != 0xff);
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printf( "RxData:\r\n" );
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for( i = 0; i < 6; i++ )
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{
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printf( "%02x ", RxData[i] );
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}
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printf("\n");
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// Reset the slave state machine
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slave_state = 0;
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slave_recv_len = 0;
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slave_send_len = 0;
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}
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#endif
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while(1);
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}
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void I2C1_EV_IRQHandler(void )
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{
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#if (I2C_MODE == HOST_MODE)
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if( I2C_GetITStatus( I2C1, I2C_IT_SB ) != RESET )
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{
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if(master_sate == 0 ){
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master_sate = 1;
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I2C_Send7bitAddress( I2C1, 0x02, I2C_Direction_Transmitter );
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}else{
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master_sate = 4;
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I2C_Send7bitAddress( I2C1, 0x02, I2C_Direction_Receiver );
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}
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}
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else if( I2C_GetITStatus( I2C1, I2C_IT_ADDR ) != RESET )
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{
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if(master_sate == 1){
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master_sate = 2;
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}
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if(master_sate == 4){
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master_sate = 5;
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}
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((void)I2C_ReadRegister(I2C1, I2C_Register_STAR2));
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}
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else if( I2C_GetITStatus( I2C1, I2C_IT_TXE ) != RESET )
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{
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if(master_sate == 2){
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if(master_send_len<6){
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I2C_SendData( I2C1, TxData[master_send_len] );
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master_send_len++;
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}else{
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master_sate = 3;
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I2C_GenerateSTART(I2C1, ENABLE);
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I2C_SendData( I2C1, 0xff ); // dummy byte, to prevent next TxE
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}
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}
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}
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else if( I2C_GetITStatus( I2C1, I2C_IT_RXNE ) != RESET )
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{
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if(master_sate == 5)
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{
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if(master_recv_len<6){
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RxData[master_recv_len] = I2C_ReceiveData(I2C1);
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master_recv_len++;
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if(master_recv_len==5){
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I2C_NACKPositionConfig(I2C1,I2C_NACKPosition_Next); // clear ack
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I2C_GenerateSTOP( I2C1, ENABLE );
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}
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if(master_recv_len==6){
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master_sate = 0xff;
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}
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}else{
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}
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}
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}
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#elif (I2C_MODE == SLAVE_MODE)
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if( I2C_GetITStatus( I2C1, I2C_IT_ADDR ) != RESET )
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{
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if(I2C_GetFlagStatus( I2C1, I2C_FLAG_TRA )&&I2C_GetFlagStatus( I2C1, I2C_FLAG_TXE ))
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{
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//write mode
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}else
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{
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//read mode
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((void)I2C_ReadRegister(I2C1, I2C_Register_STAR2));
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}
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}
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else if( I2C_GetITStatus( I2C1, I2C_IT_RXNE ) != RESET )
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{
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RxData[slave_recv_len] = I2C_ReceiveData(I2C1);
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slave_recv_len++;
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}else if( I2C_GetITStatus( I2C1, I2C_IT_STOPF ) != RESET )
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{
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I2C1->CTLR1 &= I2C1->CTLR1;
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((void)(I2C1->STAR1));
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}
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else if( I2C_GetITStatus( I2C1, I2C_IT_BTF ) != RESET )
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{
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((void)I2C_ReadRegister( I2C1, I2C_Register_STAR1));
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((void)I2C_ReceiveData(I2C1));
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}
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else if( I2C_GetITStatus( I2C1, I2C_IT_SB ) != RESET )
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{
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((void)I2C_ReadRegister( I2C1, I2C_Register_STAR1));
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((void)I2C_ReceiveData(I2C1));
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}
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else if( I2C_GetITStatus( I2C1, I2C_IT_TXE ) != RESET )
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{
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I2C_SendData(I2C1, RxData[slave_send_len]);
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slave_send_len++;
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}
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#endif
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else{
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printf( "unknown i2c event \n" );
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printf("sr1 %x \nsr2 %x \n",I2C1->STAR1,I2C1->STAR2);
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}
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}
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void I2C1_ER_IRQHandler(void)
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{
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//err
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#if (I2C_MODE == HOST_MODE)
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#elif (I2C_MODE == SLAVE_MODE)
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if( I2C_GetITStatus( I2C1, I2C_IT_AF ) )
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{
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I2C_ClearITPendingBit(I2C1, I2C_IT_AF);
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slave_state = 0xff;
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}else{
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//err
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}
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#endif
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}
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