76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
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// Copyright 2021 IOsetting <iosetting(at)outlook.com>
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* Demo: PWM 2-channel complementary output
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*
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* P1.0 -> 1k Ω resistor -> LED1+
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* P1.1 -> 1k Ω resistor -> LED2+
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* GND -> LED1-
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* GND -> LED2-
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*/
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#include "fw_hal.h"
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void main(void)
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{
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uint16_t dc = 0;
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SYS_SetClock();
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// UART1, baud 115200, baud source Timer2, 1T mode
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UART1_ConfigMode1Dyn8bitUart(UART1_BaudSource_Timer2, HAL_State_ON, 115200);
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// Set GPIO pins output mode
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GPIO_P1_SetMode(GPIO_Pin_0|GPIO_Pin_1, GPIO_Mode_Output_PP);
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// Turn off PWMA.1 before change its mode
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PWMA_PWM1_SetPortState(HAL_State_OFF);
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PWMA_PWM1N_SetPortState(HAL_State_OFF);
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// Set PWMA.1 port direction output
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PWMA_PWM1_SetPortDirection(PWMB_PortDirOut);
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// Set PWMA.1 output low voltage when counter is less than target value
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PWMA_PWM1_SetOutputMode(PWM_OutputMode_PWM_LowIfLess);
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// Enable comparison value preload to make duty cycle changing smooth
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PWMA_PWM1_SetComparePreload(HAL_State_ON);
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// Turn on PWMA.1
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PWMA_PWM1_SetPortState(HAL_State_ON);
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// Turn on PWMA.1 complementary output
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PWMA_PWM1N_SetPortState(HAL_State_ON);
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// Set highest PWM clock
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PWMA_SetPrescaler(0);
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// PWM width = AutoReloadPeriod + 1 (side alignment), or AutoReloadPeriod * 2 (center alignment)
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PWMA_SetAutoReloadPeriod(0xFF);
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// Counter direction, down:from [PWMA_ARRH,PWMA_ARRL] to 0
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PWMA_SetCounterDirection(PWM_CounterDirection_Down);
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// Enable preload on reload-period
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PWMA_SetAutoReloadPeriodPreload(HAL_State_ON);
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// Enable output on PWMA.1P, PWMA.1N
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PWMA_SetPinOutputState(PWM_Pin_1|PWM_Pin_1N, HAL_State_ON);
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// Set PWMA.1 alternative ports to P1.0 and P1.1
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PWMA_PWM1_SetPort(PWMA_PWM1_AlterPort_P10_P11);
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// Enable overall output
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PWMA_SetOverallState(HAL_State_ON);
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// Start counter
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PWMA_SetCounterState(HAL_State_ON);
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while(1)
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{
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PWMA_PWM1_SetCaptureCompareValue(dc);
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UART1_TxHex(dc >> 8);
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UART1_TxHex(dc & 0xFF);
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dc++;
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UART1_TxString("\r\n");
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if (dc == 0xFF) dc = 0;
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SYS_Delay(10);
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}
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}
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