void myThread::TimerUpdate()
{
emit deviceAmbient();
pwm_test(duty_value/10.0);
}
int main_cm3 ( void ) {
#if 1 // go for 120MHz, built into libopencm3
// requires: external 8MHz crystal on pin5/6 with associated caps to ground
rcc_clock_setup_hse_3v3 ( &hse_8mhz_3v3 [ CLOCK_3V3_120MHZ ] );
#endif
// wait a sec, so we have a reflash opportunity before things get funky
//
lame_delay_ms ( 2000 );
// initialize USART1 @ 9600 baud
//
init_usart1 ( 9600 );
usart_puts ( 1, "Init usart1 complete! Hello World!\r\n" );
//usart_puts ( 2, "Init usart2 complete! Hello World!\r\n" );
// PWM setup
#if 0
usart_puts ( 1, "usart1 pwm test start!\r\n" );
pwm_test();
usart_puts ( 1, "usart1 pwm test complete!\r\n" );
#endif
// MPU setup
#if 0
mpu_test();
usart_puts ( 1, "usart1 mpu test complete!\r\n" );
#endif
// balance!
#if 1
usart_puts ( 1, "usart1 - enter balance mode!\r\n" );
balance_or_die();
#endif
//__enable_irq();
//cm_enable_interrupts();
while ( 1 ) {
__asm__("nop");
} // while forever
return 0;
}
int main(int argc, char *argv[])
{
if(1 != bcm2835_init())
return FAIL;
if(argc != 2)
{
uSage();
return FAIL;
}
if (0 == strcasecmp(argv[1], "out"))
{
out_test();
}
else if (0 == strcasecmp(argv[1], "pud"))
{
pud_test();
}
else if (0 == strcasecmp(argv[1], "edge"))
{
edge_test();
}
else if(0 == strcasecmp(argv[1], "pwm"))
{
pwm_test();
}
else if(0 == strcasecmp(argv[1], "i2c"))
{
i2c_test();
}
else if(0 == strcasecmp(argv[1], "spi"))
{
spi_test();
}
else
{
uSage();
return FAIL;
}
bcm2835_close();
return 0;
}
/********************************** 函数实现区 *********************************/
void pwm_init(void)
{
uint32_T pre_scale_val = 0;
/*
*
* 将计数器时钟设置为:15MHz, 计算预分频值
* PWM_TIMCLK使用 APB1 的时钟 即 HCLK/2
*
* 预分频值:
* pre_scale_val = (APB1_CLK / PWM_TIM_CLK ) - 1
* => pre_scale_val = ((SystemCoreClock / 2 ) /15 MHz) - 1
*
*/
pre_scale_val = (uint32_t)((SystemCoreClock/2) / 15000000) - 1;
/*
* 设置周期为:1000 便于编程
* ARR = (PWM_TIM源时钟/PWM_TIM输出频率) - 1
* => PWM_TIM输出频率 = PWM_TIM源时钟 / (ARR + 1)
* ARR = 1000
* PWM_TIM源时钟:15MHz
* => PWM_TIM输出频率 = 15000000 / (1000 + 1)
* = 14.985 kHz
*
* 设置PWM_TIM输出频率为20 KHz, 周期(ARR)为:
* ARR = (PWM_TIM源时钟/PWM_TIM输出频率) - 1
* = 749
* */
s_period = 1000;
/* 配置PWM_TIM计数器:
* Initialize PWM_TIM peripheral as follows:
* Prescaler = (SystemCoreClock / 2 / 15000000) - 1
* Period = (750 - 1)
* ClockDivision = 0
* Counter direction = Up
* */
s_tim_handle.Instance = PWM_TIM;
s_tim_handle.Init.Prescaler = pre_scale_val;
s_tim_handle.Init.Period = s_period;
s_tim_handle.Init.ClockDivision = 0;
s_tim_handle.Init.CounterMode = TIM_COUNTERMODE_UP;
s_tim_handle.Init.RepetitionCounter = 0;
if (HAL_TIM_PWM_Init(&s_tim_handle) != HAL_OK)
{
ERR_STR("执行失败.");
}
/* 各通道的占空比计算如下:
* PWM_TIM_Channel1 占空比 = (PWM_TIM_CCR1/ PWM_TIM_ARR + 1)* 100
* PWM_TIM Channel2 占空比 = (PWM_TIM_CCR2/ PWM_TIM_ARR + 1)* 100
* PWM_TIM Channel3 占空比 = (PWM_TIM_CCR3/ PWM_TIM_ARR + 1)* 100
* PWM_TIM Channel4 占空比 = (PWM_TIM_CCR4/ PWM_TIM_ARR + 1)* 100
*
* 初始化的时候占空比全0
*/
/* 所有通道都需要 */
s_sConfig.OCMode = TIM_OCMODE_PWM1;
s_sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
s_sConfig.OCFastMode = TIM_OCFAST_DISABLE;
s_sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
s_sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
s_sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
/* 测试电机 */
pwm_test();
/* 关闭电机 */
pwm_off();
return;
}
