commit 632d8efa0552a1dfb2615d29afc727e339b72574
author Damien George <damien.p.george@gmail.com> Wed Mar 02 13:37:27 2016 +0000
committer Paul Sokolovsky <pfalcon@users.sourceforge.net> Sat Mar 26 00:32:37 2016 +0200
tree 457e8533de5a1107ea8f8ef13af644717a630a93
parent 82b95f625ebedacfaf7a8809bb5d71e9bd19fb7d

esp8266: Add PWM support.

PWM implementation uses a timer and interrupts (FRC1), taken from
Espressif's/NodeMCU's implementation and adapted for our use.

8 channels are supported, on pins 0, 2, 4, 5, 12, 13, 14, 15.

Usage:

    import machine
    pwm0 = machine.PWM(machine.Pin(0))
    pwm0.freq(1000)
    pwm0.duty(500)

Frequency is shared (ie the same) for all channels.  Frequency is
between 1 and 1000.  Duty is between 0 and 1023.

esp8266/modmachine.c

diff --git a/esp8266/modmachine.c b/esp8266/modmachine.c
index 41f2469..817b5a2 100644
--- a/esp8266/modmachine.c
+++ b/esp8266/modmachine.c
@@ -142,6 +142,7 @@
 
     { MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&esp_timer_type) },
     { MP_ROM_QSTR(MP_QSTR_Pin), MP_ROM_PTR(&pyb_pin_type) },
+    { MP_ROM_QSTR(MP_QSTR_PWM), MP_ROM_PTR(&pyb_pwm_type) },
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&pyb_i2c_type) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&pyb_spi_type) },
 };