165 lines
4.4 KiB
C
165 lines
4.4 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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single wire half duplex mode, master/slave mode, data transceiver.
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Master:SPI1_SCK(PA5)\SPI1_MOSI(PA7).
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Slave:SPI1_SCK(PA5)\SPI1_MISO(PA6).
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This routine demonstrates that Master sends and Slave receives.
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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:PA5 -- PA5
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PA7 -- PA6
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*/
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#include "debug.h"
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/* Global define */
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/* Global Variable */
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volatile u8 Txval=0, Rxval=0;
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u16 TxData[Size] = { 0x0101, 0x0202, 0x0303, 0x0404, 0x0505, 0x0606,
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0x1111, 0x1212, 0x1313, 0x1414, 0x1515, 0x1616,
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0x2121, 0x2222, 0x2323, 0x2424, 0x2525, 0x2626 };
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u16 RxData[Size];
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/*********************************************************************
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* @fn SPI_1Lines_HalfDuplex_Init
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*
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* @brief Configuring the SPI for half-duplex communication.
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*
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* @return none
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*/
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void SPI_1Lines_HalfDuplex_Init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure={0};
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SPI_InitTypeDef SPI_InitStructure={0};
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NVIC_InitTypeDef NVIC_InitStructure={0};
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE );
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#if (SPI_MODE == HOST_MODE)
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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#elif (SPI_MODE == SLAVE_MODE)
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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#endif
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#if (SPI_MODE == HOST_MODE)
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SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
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SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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#elif (SPI_MODE == SLAVE_MODE)
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SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;
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SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
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#endif
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SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
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SPI_InitStructure.SPI_CRCPolynomial = 7;
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SPI_Init( SPI1, &SPI_InitStructure );
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NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
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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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#if (SPI_MODE == SLAVE_MODE)
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SPI_I2S_ITConfig( SPI1, SPI_I2S_IT_RXNE , ENABLE );
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#endif
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SPI_Cmd( SPI1, 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;
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
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Delay_Init();
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USART_Printf_Init(115200);
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printf("SystemClk:%d\r\n",SystemCoreClock);
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#if (SPI_MODE == SLAVE_MODE)
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printf("SLAVE Mode\r\n");
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Delay_Ms(1000);
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#endif
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SPI_1Lines_HalfDuplex_Init();
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#if (SPI_MODE == HOST_MODE)
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printf("HOST Mode\r\n");
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Delay_Ms(2000);
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SPI_I2S_ITConfig( SPI1, SPI_I2S_IT_TXE , ENABLE );
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#endif
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while(1)
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{
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#if (SPI_MODE == HOST_MODE)
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while( Txval<18 );
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while( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) != RESET )
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{
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if(SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_BSY ) == RESET)
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{
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SPI_Cmd( SPI1, DISABLE );
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while(1);
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}
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}
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#elif (SPI_MODE == SLAVE_MODE)
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while( Rxval<18 );
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for( i=0; i<18; i++ ){
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printf( "Rxdata:%04x\r\n", RxData[i] );
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}
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while(1);
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#endif
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}
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}
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