The attachment is an I2S demo based on ESP8266_NONOS_SDK.

If using ESP8266_NONOS_SDK_V1.5.0 or later version, please add "-lcrypto" in 'LINKFLAGS_eagle.app.v6" area of the Makefile.

Documentation about I2S

The attachment is a demo of SPI running as slave based on ESP8266_NONOS_SDK.

If using ESP8266_NONOS_SDK_V1.5.0 or later version, please add "-lcrypto" in 'LINKFLAGS_eagle.app.v6" area of the Makefile.

Documentation about SPI

This is for ESP8266_NONOS_SDK.

If using ESP8266_NONOS_SDK_V1.5.0 or later version, please add "-lcrypto" in 'LINKFLAGS_eagle.app.v6" area of Makefile.

The PWM sample in IOT_Demo of ESP8266_NONOS_SDK：

1. It has a 100us tuning of PWM duty besides the original period.

2. During the tuning, it can not reach the 100% high-level. The tuning may seem like a noise wave.

3. This method can get a high accuracy(long period leads to high accuracy), but if duty gets close to 100%, the accuracy turns to be lower.

There is another PWM demo as the attachment which can get 100% duty, and reliable period, but the accuracy is lower.

How to use this demo:

1. Copy pwm.c into app/user, copy pwm .h into app/include.

Remove "-lpwm" in app/Makefile.

2. Sample codes:

#define PWM_1_OUT_IO_FUNC  FUNC_GPIO15

#define PWM_2_OUT_IO_MUX PERIPHS_IO_MUX_MTCK_U
#define PWM_2_OUT_IO_NUM 13
#define PWM_2_OUT_IO_FUNC  FUNC_GPIO13

uint32 io_info[][3] = {   {PWM_0_OUT_IO_MUX,PWM_0_OUT_IO_FUNC,PWM_0_OUT_IO_NUM},
                          {PWM_1_OUT_IO_MUX,PWM_1_OUT_IO_FUNC,PWM_1_OUT_IO_NUM},
                          {PWM_2_OUT_IO_MUX,PWM_2_OUT_IO_FUNC,PWM_2_OUT_IO_NUM},
                          };

u32 duty[3] = {600,604,634};
pwm_init(1000, duty,3,io_info);

// Set duty, the max duty is 8191 which is set in pwm.h
pwm_set_duty(duty, channel);   // 0~2
pwm_set_period(uint32 period);  // set period;
pwm_start();