This module is designed for generating pulse-width modulation (PWM) signals on an FPGA platform. It supports both SPI and I2C communication protocols and provides up to 8 channels of PWM output. Additionally, it has 2 sub-counters that can generate signals with different frequencies.
- Supports SPI and I2C communication protocols
- Up to 8 channels of PWM output
- 2 sub-counters that can generate signals with different frequencies
- Supports a maximum SPI communication speed of 15MHz
- Supports a maximum I2C communication speed of 400kHz
- Uses 923 LUTs and 535 FFs in Gowin FPGA GW1N-LV1
| Offset | Name | Description |
|---|---|---|
| 0x00 | subpwm0_period | Period of sub-counter 0 |
| 0x01 | CCR0 | Compare value of channel 0 |
| 0x02 | CCR1 | Compare value of channel 1 |
| 0x03 | CCR2 | Compare value of channel 2 |
| 0x04 | CCR3 | Compare value of channel 3 |
| 0x05 | CCR4 | Compare value of channel 4 |
| 0x06 | CCR5 | Compare value of channel 5 |
| 0x07 | CCR6 | Compare value of channel 6 |
| 0x08 | CCR7 | Compare value of channel 7 |
| 0x20 | pwm_channel_map0 | PWM channel mapping register for channel 0 to 8 |
| 0x40 | subpwm1_period | Period of sub-counter 1 |
| 0x50 | config | Configuration register. Bit 15: enable timeout; Bit 14: enable sub-counter 1; Low 5 bits: pre-divider |
| 0x7D | timeout_max_low | Timeout value (low 16 bits) |
| 0x7E | timeout_max_high | Timeout value (high 16 bits) |
| 0x7F | watchdog | Watchdog register. Toggle the LSB to clear the timeout flag |
This module is licensed under the GPL 3.0 license. Please see the LICENSE file for details.
- ncerzzk - Initial work
- Thanks to OpenAI for providing the ChatGPT model used to generate this documentation.
该FPGA PWM模块可以在FPGA上实现PWM输出。模块支持SPI/I2C协议，最多支持8个通道以及2个子计数器（可以生成2种不同频率）。模块已经在Gowin FPGA GW1N-LV1上进行过测试，消耗资源为923个LUT和535个FF。
| 偏移地址 | 名称 | 描述 |
|---|---|---|
| 0x0 | subpwm0_period | 子计数器0的周期 |
| 0x1 | CCR0 | 通道0的比较值 |
| 0x2 | CCR1 | 通道1的比较值 |
| 0x3 | CCR2 | 通道2的比较值 |
| 0x4 | CCR3 | 通道3的比较值 |
| 0x5 | CCR4 | 通道4的比较值 |
| 0x6 | CCR5 | 通道5的比较值 |
| 0x7 | CCR6 | 通道6的比较值 |
| 0x8 | CCR7 | 通道7的比较值 |
| 0x20 | pwm_channel_map0 | 通道0到7的PWM通道映射寄存器 |
| 0x40 | subpwm1_period | 子计数器1的周期 |
| 0x50 | config | 配置寄存器，Bit 15:使能超时；Bit 14:使能子计数器1；低5位：预分频器 |
| 0x7f | watchdog | 看门狗寄存器，切换LSB以清除超时标志 |
| 0x7e | timeout max high | 超时值高16位 |
| 0x7d | timeout max low | 超时值低16位 |
该FPGA PWM模块是基于GPL 3.0许可证发布的，您可以自由使用、修改和分发该模块。
