esp32c3,esp-idf 4.4.4,与ch623刷卡芯片用spi通信不用dma,给个例程
时间: 2024-03-10 19:48:37 浏览: 201
好的,以下是一个简单的例程,演示如何在ESP32-C3上使用SPI接口与CH623刷卡芯片进行通信,不使用DMA:
```c
#include "driver/spi_master.h"
#define PIN_NUM_MISO 2
#define PIN_NUM_MOSI 3
#define PIN_NUM_CLK 4
#define PIN_NUM_CS 5
#define CH623_CMD_READ 0x03
#define CH623_CMD_WRITE 0x02
void ch623_read_reg(spi_device_handle_t spi, uint8_t reg_addr, uint8_t *data, uint32_t len)
{
spi_transaction_t t;
memset(&t, 0, sizeof(t));
t.flags = SPI_TRANS_USE_RXDATA;
t.length = 8 * (len + 1);
t.tx_data[0] = CH623_CMD_READ;
t.tx_data[1] = reg_addr;
spi_device_polling_transmit(spi, &t);
memcpy(data, t.rx_data + 1, len);
}
void ch623_write_reg(spi_device_handle_t spi, uint8_t reg_addr, const uint8_t *data, uint32_t len)
{
spi_transaction_t t;
memset(&t, 0, sizeof(t));
t.length = 8 * (len + 2);
t.tx_data[0] = CH623_CMD_WRITE;
t.tx_data[1] = reg_addr;
memcpy(t.tx_data + 2, data, len);
spi_device_polling_transmit(spi, &t);
}
void app_main()
{
spi_bus_config_t buscfg = {
.miso_io_num = PIN_NUM_MISO,
.mosi_io_num = PIN_NUM_MOSI,
.sclk_io_num = PIN_NUM_CLK,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
};
spi_device_interface_config_t devcfg = {
.clock_speed_hz = 1000000,
.mode = 0,
.spics_io_num = PIN_NUM_CS,
.queue_size = 1,
};
spi_device_handle_t spi;
spi_bus_initialize(0, &buscfg, 1);
spi_bus_add_device(0, &devcfg, &spi);
uint8_t data[4];
ch623_read_reg(spi, 0x01, data, sizeof(data)); // 读取地址为0x01的寄存器
ch623_write_reg(spi, 0x02, data, sizeof(data)); // 将读取到的数据写入地址为0x02的寄存器
spi_bus_remove_device(spi);
spi_bus_free(0);
}
```
这个例程使用ESP32-C3的SPI Master驱动来与CH623刷卡芯片进行通信。其中,`ch623_read_reg()`和`ch623_write_reg()`函数分别演示了如何读取和写入CH623芯片的寄存器。在这个例程中,SPI Master的时钟频率为1 MHz,模式为0,CS引脚为5号引脚,MISO、MOSI和SCLK分别为2、3、4号引脚。由于不使用DMA,所以在每次通信时都需要使用`spi_device_polling_transmit()`函数来进行传输。
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