esb通信，也就是纯2.4g的一个通信，据说是兼容24L01+芯片，没有试过，这里是用两个nrf52832芯片做的通信实验。
相关历程参考 如下：
历程里面注释确实不多。
里面函数api介绍可以参考官方SDK文档：https://infocenter.nordicsemi.com/index.jsp
esb通信和24L01+芯片初始化内容大致是类似的，基本上就是初始化通信速度，模式，重发时间，通道，地址，等，
小区别：
esb多了一个回调函数。
地址 =基地址（4byte）+前缀地址（1byte )两部分组成，地址长度是5个字节，在24L01+中是没有这样分开配置的。同样的，除了pipe0的基地址可以改，其它pipe只有使用同样的基地址，所有的pipe前缀地址都可以改变。
//发射初始化
uint32_t esb_init_tx( uint8_t ch, uint8_t *addr )
{clocks_start();uint32_t err_code;//uint8_t base_addr_0[4] = {0x57, 0xE7, 0x87, 0xE7};//uint8_t base_addr_1[4] = {0xC2, 0xC2, 0xC2, 0xC2};uint8_t addr_prefix[8] = {0xE7, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8 };nrf_esb_config_t nrf_esb_config = NRF_ESB_DEFAULT_CONFIG;nrf_esb_config.protocol = NRF_ESB_PROTOCOL_ESB_DPL;nrf_esb_config.retransmit_delay = 600;nrf_esb_config.bitrate = NRF_ESB_BITRATE_2MBPS;nrf_esb_config.event_handler = nrf_esb_event_handler_tx;nrf_esb_config.mode = NRF_ESB_MODE_PTX;nrf_esb_config.selective_auto_ack = false;err_code = nrf_esb_init(&nrf_esb_config);err_code =nrf_esb_set_rf_channel(ch); //通信通道err_code = nrf_esb_set_base_address_0(addr); //只用pipe 0,4个地址可变//err_code = nrf_esb_set_base_address_1(base_addr_1);err_code = nrf_esb_set_prefixes(addr_prefix, NRF_ESB_PIPE_COUNT);return err_code;
}本文章是对esb通信进行了封装，方便直接调用使用
所有源码：
#include "wp_esp.h"
#include "app_error.h"#include "bsp.h"
#include "nrf_delay.h"
#include "nrf_esb.h"
#include "nrf_log.h"static nrf_esb_payload_t tx_payload = NRF_ESB_CREATE_PAYLOAD(0, 0x0, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00);
nrf_esb_payload_t rx_payload;void nrf_esb_event_handler_rx(nrf_esb_evt_t const * p_event)
{switch (p_event->evt_id){case NRF_ESB_EVENT_TX_SUCCESS:printf("TX SUCCESS EVENT\r\n");break;case NRF_ESB_EVENT_TX_FAILED:printf("TX FAILED EVENT\r\n");break;case NRF_ESB_EVENT_RX_RECEIVED:printf("RX RECEIVED EVENT\r\n");if (nrf_esb_read_rx_payload(&rx_payload) == NRF_SUCCESS){printf("Receiving packet: %02x\r\n", rx_payload.data[1]);}break;}
}//接收初始化
uint32_t esb_init_rx( uint8_t ch, uint8_t *addr )
{uint32_t err_code;//uint8_t base_addr_0[4] = {0xe7, 0xE7, 0xE7, 0xE7};//uint8_t base_addr_1[4] = {0xC2, 0xC2, 0xC2, 0xC2};uint8_t addr_prefix[8] = {0xE7, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8 };nrf_esb_config_t nrf_esb_config = NRF_ESB_DEFAULT_CONFIG;nrf_esb_config.payload_length = 8;nrf_esb_config.protocol = NRF_ESB_PROTOCOL_ESB_DPL;nrf_esb_config.bitrate = NRF_ESB_BITRATE_2MBPS;nrf_esb_config.mode = NRF_ESB_MODE_PRX;nrf_esb_config.event_handler = nrf_esb_event_handler_rx;nrf_esb_config.selective_auto_ack = false;err_code = nrf_esb_init(&nrf_esb_config);err_code =nrf_esb_set_rf_channel(ch);err_code = nrf_esb_set_base_address_0(addr);//err_code = nrf_esb_set_base_address_1(base_addr_1);err_code = nrf_esb_set_prefixes(addr_prefix, 8);return err_code;
}void nrf_esb_event_handler_tx(nrf_esb_evt_t const * p_event)
{switch (p_event->evt_id){case NRF_ESB_EVENT_TX_SUCCESS:printf("TX SUCCESS EVENT\r\n");break;case NRF_ESB_EVENT_TX_FAILED:printf("TX FAILED EVENT\r\n");(void) nrf_esb_flush_tx();(void) nrf_esb_start_tx();break;case NRF_ESB_EVENT_RX_RECEIVED:printf("RX RECEIVED EVENT\r\n");while (nrf_esb_read_rx_payload(&rx_payload) == NRF_SUCCESS){if (rx_payload.length > 0){printf("RX RECEIVED PAYLOAD %x\r\n",rx_payload.data[1]);}}break;}
}//发射初始化
uint32_t esb_init_tx( uint8_t ch, uint8_t *addr )
{uint32_t err_code;//uint8_t base_addr_0[4] = {0x57, 0xE7, 0x87, 0xE7};//uint8_t base_addr_1[4] = {0xC2, 0xC2, 0xC2, 0xC2};uint8_t addr_prefix[8] = {0xE7, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8 };nrf_esb_config_t nrf_esb_config = NRF_ESB_DEFAULT_CONFIG;nrf_esb_config.protocol = NRF_ESB_PROTOCOL_ESB_DPL;nrf_esb_config.retransmit_delay = 600;nrf_esb_config.bitrate = NRF_ESB_BITRATE_2MBPS;nrf_esb_config.event_handler = nrf_esb_event_handler_tx;nrf_esb_config.mode = NRF_ESB_MODE_PTX;nrf_esb_config.selective_auto_ack = false;err_code = nrf_esb_init(&nrf_esb_config);err_code =nrf_esb_set_rf_channel(ch);err_code = nrf_esb_set_base_address_0(addr); //只用pipe 0,4个地址可变//err_code = nrf_esb_set_base_address_1(base_addr_1);err_code = nrf_esb_set_prefixes(addr_prefix, NRF_ESB_PIPE_COUNT);return err_code;
}uint32_t esp_start_rx(void )
{return nrf_esb_start_rx();
}void test_send(void )
{tx_payload.noack = false;if (nrf_esb_write_payload(&tx_payload) == NRF_SUCCESS){//printf("Sending packet ok \r\n");tx_payload.data[1]++;}else{printf("Sending packet failed \r\n");}}
发射端调用：
u8 ch =10;u8 addr[4] ={0x57, 0xE7, 0x87, 0xE7};esb_init_tx(ch,addr);printf("ESP TX \r\n");printf("Sending packet ...");while(1){test_send();nrf_delay_ms(1000);}接收端使用：
u8 ch =10;u8 addr[4] ={0x57, 0xE7, 0x87, 0xE7};esb_init_rx(ch,addr);esp_start_rx();printf("ESP RX \r\n");while (1){}可以看到，只有发射端在主任务里面做了发送处理，接收端所有的处理都在回调函数里面，比24L01芯片好用多了，这个例子也是实现了双向传输，官方的例子是单向传输。
运行效果：
