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在使用stm32f401硬件spi和nrf24l01通信，发现读取不上来无线模块的寄存器值，发现调整SPI_BAUDRATEPRESCALER_16和gpio的速度，每次读取得到的值都不一样，而且都是错误的值，spi1的速度最大是42mhz，2.4g最大8mhz，spi的速度配成2,4，8,16都不行。读取不上来。
比如：如果spi速度是8分频，gpio是高速，那读取上来的值都是0x1f（读取无线模块的任何一个寄存器都是这个值），如果调整成16，那读上来的全部都是0x7f。
Clr_NRF24L01_CSN;
spi1_read_write_byte(0x07);
u8nrf2401l = spi1_read_write_byte(0xFF);
Set_NRF24L01_CSN;
/* USER CODE END SPI1_Init 1 */
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 7;
}
void HAL_SPI_MspInit(SPI_HandleTypeDef* spiHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(spiHandle->Instance==SPI1)
{
/* USER CODE BEGIN SPI1_MspInit 0 */
/* USER CODE END SPI1_MspInit 0 */
/* SPI1 clock enable */
__HAL_RCC_SPI1_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/**SPI1 GPIO Configuration
PA4 ------> SPI1_NSS
PA5 ------> SPI1_SCK
PA6 ------> SPI1_MISO GPIO_AF5_SPI1
PA7 ------> SPI1_MOSI
*/
GPIO_InitStruct.Pin = SPI1_SCK_Pin|SPI1_MOSI_Pin|SPI1_MISO_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* USER CODE BEGIN SPI1_MspInit 1 */
GPIO_InitStruct.Pin = SPI1_NSS_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* USER CODE END SPI1_MspInit 1 */
}
}
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发表于 2025-4-3 22:54:44
楼主
发表于 2025-4-4 12:08:33
