// Lua: clock = getclock()
static int lpwmled_getclock( lua_State* L )
{
unsigned id;
u32 clk;
clk = platform_pwm_get_clock( led.pwmidr );
lua_pushinteger( L, clk );
return 1;
}
// Lua: clock = getclock( id )
static int ICACHE_FLASH_ATTR lpwm_getclock( lua_State* L )
{
unsigned id;
u32 clk;
id = luaL_checkinteger( L, 1 );
MOD_CHECK_ID( pwm, id );
clk = platform_pwm_get_clock( id );
lua_pushinteger( L, clk );
return 1;
}
u32 platform_pwm_setup( unsigned id, u32 frequency, unsigned duty )
{
PWM_MATCHCFG_Type PWMMatchCfgDat;
u32 divisor = platform_pwm_get_clock( id ) / frequency - 1;
PWM_MatchUpdate( LPC_PWM1, 0, divisor, PWM_MATCH_UPDATE_NOW ); // PWM1 cycle rate
PWM_MatchUpdate( LPC_PWM1, id, ( divisor * duty ) / 100, PWM_MATCH_UPDATE_NOW ); // PWM1 channel edge position
if ( id > 1 ) // Channel one is permanently single-edge
PWM_ChannelConfig( LPC_PWM1, id, PWM_CHANNEL_SINGLE_EDGE );
PWMMatchCfgDat.IntOnMatch = DISABLE;
PWMMatchCfgDat.MatchChannel = id;
PWMMatchCfgDat.ResetOnMatch = DISABLE;
PWMMatchCfgDat.StopOnMatch = DISABLE;
PWM_ConfigMatch(LPC_PWM1, &PWMMatchCfgDat);
PWM_ResetCounter(LPC_PWM1);
PWM_CounterCmd(LPC_PWM1, ENABLE);
PWM_ChannelCmd(LPC_PWM1, id, ENABLE);
return platform_pwm_get_clock( id ) / divisor;
}
uint32_t platform_pwm_setup( unsigned pin, uint32_t frequency, unsigned duty )
{
uint32_t clock;
if ( pin < NUM_PWM)
{
platform_gpio_mode(pin, PLATFORM_GPIO_OUTPUT, PLATFORM_GPIO_FLOAT); // disable gpio interrupt first
if(!pwm_add(pin))
return 0;
// pwm_set_duty(DUTY(duty), pin);
pwm_set_duty(0, pin);
pwms_duty[pin] = duty;
pwm_set_freq((uint16_t)frequency, pin);
} else {
return 0;
}
clock = platform_pwm_get_clock( pin );
pwm_start();
return clock;
}
