CH32V307_SPI_HardNSS

/********************************** (C) COPYRIGHT *******************************
* File Name          : main.c
* Author             : WCH
* Version            : V1.0.0
* Date               : 2021/06/06
* Description        : Main program body.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/

/*
 *@Note
 USART Print debugging routine:
 USART1_Tx(PA9).
 This example demonstrates using USART1(PA9) as a print debug port output.

*/

#include "debug.h"


/* Global typedef */

/* Global define */

/* Global Variable */

void SPI1_Init(){
    RCC->APB2PCENR  |= RCC_APB2Periph_GPIOA;
    //SPI1_NSS(PA4 GPIO_Mode_AF_PP)
    GPIOA->CFGLR  = (GPIOA->CFGLR & ~ GPIO_CFGLR_CNF4_0) | GPIO_CFGLR_CNF4_1;
    GPIOA->CFGLR |= GPIO_CFGLR_MODE4;
    GPIOA->BSHR = GPIO_BSHR_BS4;
    //SPI1_SCK(PA5 GPIO_Mode_AF_PP)
    GPIOA->CFGLR  = (GPIOA->CFGLR & ~ GPIO_CFGLR_CNF5_0)|(GPIO_CFGLR_CNF5_1);
    GPIOA->CFGLR |= GPIO_CFGLR_MODE5;
    //SPI1_MOSI(PA7 GPIO_Mode_AF_PP)
    GPIOA->CFGLR  = (GPIOA->CFGLR & ~(GPIO_CFGLR_CNF7_0))|(GPIO_CFGLR_CNF7_1);
    GPIOA->CFGLR |= GPIO_CFGLR_MODE7;
    //SPI1_MISO(PA6 GPIO_Mode_IN_FLOATING)
    GPIOA->CFGLR = (GPIOA->CFGLR & ~(GPIO_CFGLR_CNF6_0))|(GPIO_CFGLR_CNF6_1);
    GPIOA->CFGLR = GPIOA->CFGLR & ~GPIO_CFGLR_MODE6;
    // Настройка SPI1
    RCC->APB2PCENR  |= RCC_APB2Periph_SPI1;     // вкл. тактирование SPI1
    SPI1->CTLR1 |= SPI_CTLR1_MSTR;              // вкл. МАСТЕР
    SPI1->CTLR1 |= SPI_BaudRatePrescaler_64;    //
    SPI1->CTLR1 &= ~SPI_CTLR1_SSM;              // Hard_NSS
    SPI1->CTLR2 |= SPI_CTLR2_SSOE;              // включаем драйвер NSS
    //SPI1->CTLR1 |= SPI_CTLR1_SPE; // вкл SPI
}


void SPIx_Init(void)
{
    SPI_InitTypeDef  SPI_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO| RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 ,ENABLE);

    // SPI1_SCK & SPI1_MOSI
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //SPI1_NSS
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //SPI1_MOSI
    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //SPI1
    //GPIO_PinRemapConfig(GPIO_Remap_SPI1, ENABLE);

    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_Hard;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);
    SPI_SSOutputCmd(SPI1, ENABLE);

    SPI_Cmd(SPI1, ENABLE);
}




uint8_t Spi1_Write_Data(uint8_t data)
{
    //SPI1->CTLR1 |= SPI_CTLR1_SPE;
    while(!(SPI1->STATR & SPI_STATR_TXE));   //ждём пока опустошится Tx буфер
    //CS_LOW();
    SPI1->DATAR = (uint8_t)data;             //отправляем данные
    //while(!(SPI1->STATR & SPI_STATR_RXNE));  //ждём пока придёт ответ
    //data = (uint8_t)(SPI1->DATAR);           //считываем полученные данные
    //CS_HIGH();
    //SPI1->CTLR1 &= ~SPI_CTLR1_SPE;
    return data;
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    SystemCoreClockUpdate();
    Delay_Init();
    USART_Printf_Init(115200);
    printf("SystemClk:%d\r\n",SystemCoreClock);
    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
    printf("Test SPI Hard_NSS\r\n");

    SPI1_Init();
    //SPIx_Init();

        while(1)
        {
            Spi1_Write_Data(0x55);
            Delay_Us(20);
        }
}