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78 lines
1.8 KiB
78 lines
1.8 KiB
#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include "main.h"
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#include "usart.h"
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#define READ_CMD 0x80
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#define SPI_TIMEOUT_VALUE 1000
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#define SPI_CS_1() HAL_GPIO_WritePin(SPI_SEL_GPIO_Port, SPI_SEL_Pin, GPIO_PIN_SET) /* */
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#define SPI_CS_0() HAL_GPIO_WritePin(SPI_SEL_GPIO_Port, SPI_SEL_Pin, GPIO_PIN_RESET) /* */
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#define SPI_SCK_1() HAL_GPIO_WritePin(CLK_GPIO_Port, CLK_Pin, GPIO_PIN_SET) /* SCK = 1 */
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#define SPI_SCK_0() HAL_GPIO_WritePin(CLK_GPIO_Port, CLK_Pin, GPIO_PIN_RESET) /* SCK = 0 */
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#define SPI_MOSI_1() HAL_GPIO_WritePin(MOSI_GPIO_Port, MOSI_Pin, GPIO_PIN_SET) /* MOSI = 1 */
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#define SPI_MOSI_0() HAL_GPIO_WritePin(MOSI_GPIO_Port, MOSI_Pin, GPIO_PIN_RESET) /* MOSI = 0 */
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#define SPI_READ_MISO() GPIO_ReadInputDataBit(MISO_GPIO_Port, MISO_Pin) /* 读MISO口线状态 */
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#define Dummy_Byte 0xFF // 读取时MISO发送的数据，可以为任意数据
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// SPI可以同时读取和写入数据，因此一个函数即可满足要求
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uint8_t SPI_ReadWriteByte(uint8_t txData)
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{
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uint8_t i;
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uint8_t rxData = 0;
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for (i = 0; i < 8; i++)
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{
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SPI_SCK_0();
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delay_us(1);
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// 数据发送
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if (txData & 0x80)
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{
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SPI_MOSI_1();
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}
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else
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{
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SPI_MOSI_0();
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}
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txData <<= 1;
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delay_us(1);
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SPI_SCK_1();
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delay_us(1);
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// 数据接收
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rxData <<= 1;
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if (SPI_READ_MISO())
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{
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rxData |= 0x01;
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}
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delay_us(1);
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}
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SPI_SCK_0();
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return rxData;
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}
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// uint8_t SPI_ReadByte(void)
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// {
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// return SPI_ReadWriteByte(Dummy_Byte);
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// }
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// void SPI_WriteByte(uint8_t txData)
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// {
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// (void)SPI_ReadWriteByte(txData);
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// }
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void user_main()
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{
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uint8_t temp;
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SPI_CS_Disable();
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while (1)
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{
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// HAL_UART_Transmit(&huart1, &temp, 1, 100);
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HAL_Delay(100);
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}
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}
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