调试好几天了，在网上试了好多方法还是不通，希望有大神给看下到底代码写的对不对，大家往下看：
硬件连接：
使用的单片机为stm8l151C6，物理SPI和一个RC522芯片进行连接，没有SCK时钟
PB4：NSS片选
PB5：SCK
PB6：MOSI
PB7：MISO
PC4：RST（复位）
PD6：pwr（电源，自己为低功耗设计）
问题：
物理SPI初始化使能之后一直写数据，用示波器检测SCK引脚时钟，发现没有时钟信号
程序一直卡在while (SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET)
模拟SPI通信没有问题
代码如下：
void main(void)
{
hardware_init();
//enableInterrupts();
while (1)
{
// ReadRawRC(0x05);
SPIWritebyte(0xAA);
// BSP_RFID_WriteRegister(CommandReg,0xAA);
// gpio_set_low(PORTB, PIN5);
// gpio_set_high(PORTB, PIN5);
}
}
void hardware_init(void)
{
u8 rv = 0;
u8 ctrl_reg = 0, ver_reg = 0;
// gpio_set_high(PORTD, PIN7);
// system clock init
sysclk_init_hsi(CLK_SYSCLKDiv_1);
//CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
/* Select HSE as system clock source */
// CLK_SYSCLKSourceSwitchCmd(ENABLE);
// CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_HSE);
/*High speed external clock prescaler: 1*/
// CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);
// com load configuration & init
com_load_config(com_cfg, 1);
com_init(COM1, 2400, USART_WordLength_9b, USART_StopBits_1, USART_Parity_Even, USART_Mode_All, ENABLE, 0);
com_recv_init(COM1);
/* Check if the system has resumed from IWDG reset */
if (RST_GetFlagStatus(RST_FLAG_IWDGF) != RESET)
{
/* Clear IWDGF Flag */
RST_ClearFlag(RST_FLAG_IWDGF);
printf("RST_FLAG_IWDGF\r\n");
}
// rtc init
rtc_init();
BSP1_RFID_LoadConfig(&rfid_config); //加载管脚配置
CLK_PeripheralClockConfig(CLK_Peripheral_SPI1, ENABLE);
GPIO_Init(GPIOB, GPIO_Pin_4, GPIO_Mode_Out_PP_High_Fast); //NSS片选
GPIO_Init(GPIOB, GPIO_Pin_5, GPIO_Mode_Out_PP_High_Fast); //SCK
GPIO_Init(GPIOB, GPIO_Pin_6, GPIO_Mode_Out_PP_High_Fast); //MOSI
//主机模式，配置为输入
GPIO_Init(GPIOB, GPIO_Pin_7, GPIO_Mode_In_PU_No_IT); //MISO
BSP1_RFID_PowerOn(); //给RC522芯片上电
//BSP1_RFID_PowerOff();
SPI_DeInit(SPI1);
SPI_Init(SPI1, SPI_FirstBit_MSB, SPI_BaudRatePrescaler_8, SPI_Mode_Master,SPI_CPOL_Low, SPI_CPHA_1Edge,SPI_Direction_2Lines_FullDuplex, SPI_NSS_Soft, 0x07);
//SPI_Init(SPI1, SPI_FirstBit_MSB, SPI_BaudRatePrescaler_128, SPI_Mode_Master,SPI_CPOL_High, SPI_CPHA_2Edge,SPI_Direction_2Lines_FullDuplex, SPI_NSS_Soft, 0x07);
SPI_Cmd(SPI1, ENABLE); /* 使能SPI */
rv = BSP1_RFID_Reset(&ctrl_reg, &ver_reg); //和PcdReset库函数一模一样
printf("ctrl_reg:%02X, ver_reg:%02X\r\n", ctrl_reg, ver_reg);
if (rv != 0)
{
printf("rfid init error\r\n");
}
BSP_RFID_AntennaOff();
delay_ms(1);
BSP_RFID_AntennaOn();
BSP_RFID_ConfigISOType('A'); //针对ISO14443A型卡进行初始化
return;
}
/*! \brief
* rc522 reset
* \return
* MI_OK - success
* MI_ERR - failure
*/
char BSP1_RFID_Reset(u8 *ctrl_reg, u8 *version)
{
unsigned char val = 0;
/* set rc522 rst to push pull output state , and set it to 0 */
BSP_GPIO_Init(rfid_config_handler->rst.port, rfid_config_handler->rst.pin, GPIO_Mode_Out_PP_Low_Fast);
// /* set rs522 nss to push pull output state, and set it to 1, disable sck,mosi,miso pin */
// BSP_GPIO_Init(rfid_config_handler->nss.port, rfid_config_handler->nss.pin, GPIO_Mode_Out_PP_High_Fast);
// /* set rc522 sck to push pull output state, and set it to 1 */
// BSP_GPIO_Init(rfid_config_handler->sck.port, rfid_config_handler->sck.pin, GPIO_Mode_Out_PP_High_Fast);
// /* set rc522 miso to push up input state*/
// BSP_GPIO_Init(rfid_config_handler->miso.port, rfid_config_handler->miso.pin, GPIO_Mode_In_PU_No_IT);
// //BSP_GPIO_Init(rfid_config_handler->miso.port, rfid_config_handler->miso.pin, GPIO_Mode_Out_PP_High_Fast);
// /* set rc522 mosi to push pull output state, and set it to 1 */
// BSP_GPIO_Init(rfid_config_handler->mosi.port, rfid_config_handler->mosi.pin, GPIO_Mode_Out_PP_High_Fast);
delay_us(10);
/* rs522 will be reset by setting rst to execute 1-0-1 sequence. */
BSP_GPIO_SetHigh(rfid_config_handler->rst.port, rfid_config_handler->rst.pin);
delay_us(10);
BSP_GPIO_SetLow(rfid_config_handler->rst.port, rfid_config_handler->rst.pin);
delay_us(10);
BSP_GPIO_SetHigh(rfid_config_handler->rst.port, rfid_config_handler->rst.pin);
delay_us(10);
// RC522_RST_H();
// delay_us(10);
// RC522_RST_L();
// delay_us(10);
// RC522_RST_H();
// delay_us(10);
WriteRawRC(CommandReg,PCD_RESETPHASE);
delay_us(10);
WriteRawRC(ModeReg,0x3D); //和Mifare卡通讯，CRC初始值0x6363
WriteRawRC(TReloadRegL,30);
WriteRawRC(TReloadRegH,0);
WriteRawRC(TModeReg,0x8D);
WriteRawRC(TPrescalerReg,0x3E);
WriteRawRC(TxAutoReg,0x40);//必须要
val = ReadRawRC(ControlReg);
if (val == 0xFF)
{
//printf("CtlReg:%02X\r\n", val);
return MI_ERR;
}
*ctrl_reg = val;
val = ReadRawRC(VersionReg);
if (val == 0xFF)
{
//printf("Ver:%02X\r\n", val);
return MI_ERR;
}
*version = val;
//
// BSP_RFID_AntennaOff();
// BSP_RFID_ConfigISOType('A');
// delay_ms(1);
// BSP_RFID_AntennaOn();
return MI_OK;
}
void SPIWritebyte(u8 Byte)
{
u16 retry=0;
// u8 rv = 0;
while (SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET)
{
retry++;
if(retry>200)
{
return;
}
}
SPI_SendData(SPI1, Byte);
retry=0;
//while (SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET)
while (SPI_GetFlagStatus(SPI1, SPI_FLAG_BSY) == SET)
{
retry++;
if(retry>400)return;
}
while (SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET)
{
retry++;
if(retry>400)return;
}
SPI_ReceiveData(SPI1);
} |
|
楼主
标题置顶
标题高亮
