采用的是例程（FullDuplex_HardNSS）中的初始化：
void?SPI_FullDuplex_Init(void)
{
????GPIO_InitTypeDef?GPIO_InitStructure={0};
????SPI_InitTypeDef?SPI_InitStructure={0};
????RCC_APB2PeriphClockCmd(?RCC_APB2Periph_GPIOA?|?RCC_APB2Periph_SPI1,?ENABLE?);
????GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_4;
????GPIO_InitStructure.GPIO_Mode?=?GPIO_Mode_AF_PP;
????GPIO_InitStructure.GPIO_Speed?=?GPIO_Speed_50MHz;
????GPIO_Init(?GPIOA,?&GPIO_InitStructure?);
????GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_5;
????GPIO_InitStructure.GPIO_Mode?=?GPIO_Mode_AF_PP;
????GPIO_InitStructure.GPIO_Speed?=?GPIO_Speed_50MHz;
????GPIO_Init(?GPIOA,?&GPIO_InitStructure?);
????GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_6;
????GPIO_InitStructure.GPIO_Mode?=?GPIO_Mode_IN_FLOATING;
????GPIO_Init(?GPIOA,?&GPIO_InitStructure?);
????GPIO_InitStructure.GPIO_Pin?=?GPIO_Pin_7;
????GPIO_InitStructure.GPIO_Mode?=?GPIO_Mode_AF_PP;
????GPIO_InitStructure.GPIO_Speed?=?GPIO_Speed_50MHz;
????GPIO_Init(?GPIOA,?&GPIO_InitStructure?);
????SPI_SSOutputCmd(?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_2Edge;
????SPI_InitStructure.SPI_NSS?=?SPI_NSS_Hard;
????SPI_InitStructure.SPI_BaudRatePrescaler?=?SPI_BaudRatePrescaler_32;
????SPI_InitStructure.SPI_FirstBit?=?SPI_FirstBit_MSB;
????SPI_InitStructure.SPI_CRCPolynomial?=?7;
????SPI_Init(?SPI1,?&SPI_InitStructure?);
????SPI_Cmd(?SPI1,?ENABLE?);
}
main函數(shù)中的代碼如下：
int?main(void)?{
????//優(yōu)先級(jí)分組，延時(shí)以及調(diào)試串口初始化（使用的是USART3->D8(TX)、D9(RX)?,需要用別的串口的同學(xué)可以修改USART_Printf_Init()中的參數(shù)
????LQ_V30xInit();
????PIN_InitConfig(PC4,?GPI,?0,?GPIO_Mode_IN_FLOATING);
????SPI_FullDuplex_Init();
????u8?i=0;
????u8?TxData[18]?=????{?0x41,?0x42,?0x43,?0x44,?0x45,?0x46,
?????????????????????????0x47,?0x48,?0x49,?0x50,?0x51,?0x52,
?????????????????????????0x53,?0x54,?0x55,?0x56,?0x57,?0x58?};
????//檢測(cè)是否達(dá)到發(fā)送數(shù)據(jù)的要求
????while(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_4)?==?Bit_RESET)
????{
????????LED_Ctrl(LED1,?OFF);
????}
????LED_Ctrl(LED1,?ON);
????while(1)
????{
????????for(i?=?0;?i?<?18;?i++)
????????{
????????????while(?SPI_I2S_GetFlagStatus(?SPI1,?SPI_I2S_FLAG_TXE?)?==?RESET?);
????????????SPI_I2S_SendData(?SPI1,?TxData[i]?);
????????}
????????LED_Ctrl(LED0,?RVS);
????????Delay_Ms(100);
????}
}
得到的波形如下圖：只有前幾個(gè)數(shù)據(jù)是正常的，當(dāng)NSS引腳出現(xiàn)高電平時(shí)數(shù)據(jù)解析出現(xiàn)問題，我的從設(shè)備收到的數(shù)據(jù)為亂碼。
并且看mian函數(shù)中我發(fā)送的是18個(gè)數(shù)據(jù)，這里明顯不到18個(gè)數(shù)據(jù)。發(fā)送完成后NSS引腳也沒有自動(dòng)拉高，順便說一下，NSS引腳接了10K的上拉電阻。
熱門產(chǎn)品 :
CH592: RISC-V內(nèi)核BLE5.4無線MCU
