[Rawpixel RVB2601 development board trial experience] GRB breathing light
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This post was last edited by Mengxi Kaiwu on 2022-3-23 13:54
Download the Jianchi CDK software in advance, and you can experience the Pingtouge RVB2601 development board. There is an RGB light on the RVB2601 development board, as shown in Figure 1-1. Search for ch2601_marquee_demo in the HOME on the far right of the CDK main interface and download it (the specific interface is shown in Figure 1-2). After opening the project, you will find that the project actually contains "two small projects": "#define CONFIG_PWM_MODE" and "#define CONFIG_GPIO_MODE". "#define CONFIG_PWM_MODE" uses PWM to implement the RGB three-color flashing mode, while #define CONFIG_GPIO_MODE uses GPIO to implement the RGB three-color flashing mode. To implement a mode, comment the other mode. For example, to implement the PWM mode, comment the GPIO mode: //#define CONFIG_GPIO_MODE. It was a bit difficult to read the program at first.
Because I didn't know how to view the program, I later learned from other posts that I should right-click the project and select Parse all project, so that I can view the specific function content, but I still can't view the content of some specific structures. I can only query from the online YOC document: https://yoc.docs.t-head.cn/yocbook/Chapter3-AliOS/CSI%E8%AE%BE%E5%A4%87%E9%A9%B1%E5%8A%A8%E6%8E%A5%E5%8F%A3/CSI2/PWM.html#csipwmt. This time I want to experience the feeling of breathing light.
Figure 1-1
Figure 1-2
Then, to implement the breathing light program, you have to modify this routine yourself. First, comment the GPIO mode: //#define CONFIG_GPIO_MODE. There are two main modified functions, namely void led_pinmux_init() and void led_refresh(). Among them, void led_pinmux_init() is the initialization program of the RGB driver, which mainly selects the GPIO port, sets the frequency, channel, effective pulse width and effective pulse level of the PWM wave; void led_refresh() is the non-linear dimming program of the RGB breathing light, csi_pwm_out_stop(&r, pwm_IO / 2) is to turn on PWM, and pwm_IO is the corresponding specific channel. Here I feel that the YOC document’s annotation on the csi_pwm_out_config function is wrong. Pulse_width_us should be: effective level time = period_us-pulse_width_us (unit us). The specific contents of the two modified functions are as follows:
void led_pinmux_init()
{
//7是红色，2是绿色，1是蓝色
//csi_error_t csi_pwm_out_config(csi_pwm_t *pwm,uint32_t channel,
//uint32_t period_us,uint32_t pulse_width_us,csi_pwm_polarity_t polarity)
//pwm: 设备句柄。
//channel：通道号（范围0~5）。
//period_us：信号周期时间（单位us）。
//pulse_width_us：有效电平时间=period_us-pulse_width_us（单位us）。
//polarity：有效电平极性。
csi_pwm_out_config(&r, 7 / 2, 300, 100, PWM_POLARITY_HIGH);
csi_error_t ret;
csi_pin_set_mux(PA7, PA7_PWM_CH7);
csi_pin_set_mux(PA25, PA25_PWM_CH2);
csi_pin_set_mux(PA4, PA4_PWM_CH4);
csi_pwm_init(&r, 0);
}
void led_refresh()
{
if (g_ctr == 0)
{
while(g_ctr<300)
{
csi_pwm_out_config(&r, 4/ 2, 600-g_ctr, g_ctr++, PWM_POLARITY_HIGH);
csi_pwm_out_stop(&r, 7 / 2);
csi_pwm_out_stop(&r, 2 / 2);
csi_pwm_out_start(&r, 4 / 2);
udelay(1000 * 5);
}
}
csi_pwm_out_stop(&r, 4 / 2);
udelay(1000 * 200);
if (g_ctr==300)
{
while(g_ctr>0)
{
csi_pwm_out_config(&r, 4 / 2, 600-g_ctr, g_ctr--, PWM_POLARITY_HIGH);
csi_pwm_out_stop(&r, 7 / 2);
csi_pwm_out_stop(&r, 2 / 2);
csi_pwm_out_start(&r, 4 / 2);
udelay(1000 * 5);
}
}
}
The demonstration results of the breathing light are as follows:
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