ESP32-C3, esp-idf 4.3.5。用gpio模拟方式模拟spi,GPIO14模拟SPI_CS,GPIO15模拟SPI_SCK,GPIO16模拟SPI_MOSI,GPIO17模拟SPI_MISO,GPIO4模拟NRST,GPIO12模拟IRQ。读写给个例程
时间: 2023-07-04 22:24:42 浏览: 139
好的,这里给出一个简单的例程,使用GPIO模拟SPI的方式,控制SPI设备进行读写操作。这里以一个SPI EEPROM芯片(例如25LC256)为例,演示如何进行读写操作。
```c
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "driver/spi_master.h"
#define SPI_CS GPIO_NUM_14
#define SPI_SCK GPIO_NUM_15
#define SPI_MOSI GPIO_NUM_16
#define SPI_MISO GPIO_NUM_17
#define NRST GPIO_NUM_4
#define IRQ GPIO_NUM_12
#define CMD_READ 0x03
#define CMD_WRITE 0x02
#define CMD_WRDI 0x04
#define CMD_WREN 0x06
#define CMD_RDSR 0x05
#define CMD_WRSR 0x01
#define PAGE_SIZE 256
static spi_device_handle_t spi;
static void spi_init()
{
spi_bus_config_t buscfg = {
.miso_io_num = SPI_MISO,
.mosi_io_num = SPI_MOSI,
.sclk_io_num = SPI_SCK,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
.max_transfer_sz = 0,
};
spi_device_interface_config_t devcfg = {
.clock_speed_hz = 1000000, // 时钟速度:1MHz
.mode = 0, // SPI模式:0
.spics_io_num = SPI_CS, // 片选IO口
.queue_size = 1, // 传输队列深度:1
};
spi_bus_initialize(VSPI_HOST, &buscfg, 1);
spi_bus_add_device(VSPI_HOST, &devcfg, &spi);
printf("SPI initialized!\n");
}
static void spi_write_enable()
{
uint8_t cmd = CMD_WREN;
spi_transaction_t t = {
.flags = SPI_TRANS_USE_TXDATA,
.length = 8,
.tx_data = {cmd},
};
spi_device_polling_transmit(spi, &t);
}
static void spi_write_disable()
{
uint8_t cmd = CMD_WRDI;
spi_transaction_t t = {
.flags = SPI_TRANS_USE_TXDATA,
.length = 8,
.tx_data = {cmd},
};
spi_device_polling_transmit(spi, &t);
}
static void spi_write_status(uint8_t status)
{
uint8_t cmd[2] = {CMD_WRSR, status};
spi_transaction_t t = {
.flags = SPI_TRANS_USE_TXDATA,
.length = 16,
.tx_data = {cmd[0], cmd[1]},
};
spi_device_polling_transmit(spi, &t);
}
static uint8_t spi_read_status()
{
uint8_t cmd = CMD_RDSR;
spi_transaction_t t = {
.flags = SPI_TRANS_USE_TXDATA | SPI_TRANS_USE_RXDATA,
.length = 16,
.tx_data = {cmd, 0},
};
spi_device_polling_transmit(spi, &t);
return t.rx_data[1];
}
static void spi_write(uint32_t addr, uint8_t *data, uint32_t len)
{
spi_write_enable();
uint8_t cmd[4] = {CMD_WRITE, (addr >> 16) & 0xFF, (addr >> 8) & 0xFF, addr & 0xFF};
spi_transaction_t t = {
.flags = SPI_TRANS_USE_TXDATA,
.length = (len + 4) * 8,
.tx_data = {cmd[0], cmd[1], cmd[2], cmd[3]},
};
memcpy(&t.tx_data[4], data, len);
spi_device_polling_transmit(spi, &t);
spi_write_disable();
}
static void spi_read(uint32_t addr, uint8_t *data, uint32_t len)
{
uint8_t cmd[4] = {CMD_READ, (addr >> 16) & 0xFF, (addr >> 8) & 0xFF, addr & 0xFF};
spi_transaction_t t = {
.flags = SPI_TRANS_USE_TXDATA | SPI_TRANS_USE_RXDATA,
.length = (len + 4) * 8,
.tx_data = {cmd[0], cmd[1], cmd[2], cmd[3]},
};
spi_device_polling_transmit(spi, &t);
memcpy(data, &t.rx_data[4], len);
}
void app_main()
{
spi_init();
uint8_t write_buf[PAGE_SIZE];
uint8_t read_buf[PAGE_SIZE];
// 写入数据
memset(write_buf, 0x55, PAGE_SIZE);
spi_write_status(0x00);
spi_write(0x000000, write_buf, PAGE_SIZE);
// 读取数据
spi_read(0x000000, read_buf, PAGE_SIZE);
printf("Read data: %02X %02X %02X %02X %02X %02X %02X %02X ...\n",
read_buf[0], read_buf[1], read_buf[2], read_buf[3], read_buf[4], read_buf[5], read_buf[6], read_buf[7]);
}
```
需要注意的是,上面的程序只是一个简单的示例,实际使用时需要根据具体的硬件接口和芯片驱动进行相应的修改。