您好，我在尝试使用ADS1298采集sEMG信号，但是我现在无法读取和写入寄存器。
上电后VCAP1-4各点电压为1.19V,5.2V,1.6V,0V;
上电时序完全根据Figure 93进行操作，芯片也尝试更换，仍无法读取写入；
SCK为STM32F407 SPI1生成：
void SPI1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
/* 使能时钟 */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
/* 配置GPIO引脚 */
GPIO_InitStructure.GPIO_Pin = SCK_PIN | MISO_PIN | MOSI_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(SCK_PORT, &GPIO_InitStructure);
/* 引脚复用映射 */
GPIO_PinAFConfig(SCK_PORT, GPIO_PinSource5, GPIO_AF_SPI1);
GPIO_PinAFConfig(SCK_PORT, GPIO_PinSource6, GPIO_AF_SPI1);
GPIO_PinAFConfig(SCK_PORT, GPIO_PinSource7, GPIO_AF_SPI1);
/* 配置SPI1参数 */
SPI_I2S_DeInit(SPI1); // 重置 SPI1
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_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* 使能SPI1 */
SPI_Cmd(SPI1, ENABLE);
}
以下为原理图
