// 标志的PWM配置流程
static void pwm_simple_test(void)
{
// 3个配置PWM的结构体
// Structure of PWM configuration
stc_bt_pwm_config_t stcPwmConfig;
// structure to select the PWM interrupt
stc_pwm_int_sel_t stcPwmIntSel;
// structure to set the PWM interrupt callback function
stc_pwm_int_cb_t stcPwmIntCallback;
// PWM的周期与占空比
// 这里PWM配置PwmPres1Div4, 从PCLK = 80MHZ四分频为20MHZ;
// PWM clock = 20MHZ(0.05us), cycle = (1+pwm_cycle)*(Pwm clock cycle)
// PWM clock = 20MHZ(0.05us), duty = (1+pwm_duty)*(PWM clock cycle)
uint32_t pwm_cycle = 999; // (1+999) * 0.05us = 50us = 20kHZ
uint32_t pwm_duty = 99; // (1+99) * 0.05us = 5us
// Set Basetimer IO port, 将P40引脚设为TIOA0_0功能;
PwmInitOutput();
// Set requested I/O mode
// 将定时器配置为I/O mode 0(I/O mode 0: Standard 16-bit timer mode);
Bt_ConfigIOMode(&USER_BT, BtIoMode0);
// 将定时器配置为16-bit PWM功能;
Bt_SelTimerMode(&USER_BT, BtPwmMode);
// Initialize PWM timer
stcPwmConfig.enPres = PwmPres1Div4; // PWM clock = 20MHz @ PCLK = 80MHz
stcPwmConfig.enMode = PwmContinuous; // pwm continuous, 连续不间断模式;
stcPwmConfig.enExtTrig = PwmExtTrigDisable; //关闭外部trigger;
stcPwmConfig.enOutputMask = PwmOutputNormal; //输出掩码配置
stcPwmConfig.enOutputPolarity = PwmPolarityLow; //优先级配置
stcPwmConfig.enRestartEn = PwmRestartEnable; //PWM复位使能(可以被复位，重新输出PWM)
Bt_Pwm_Init(&USER_BT, &stcPwmConfig);
// Set cycle and duty value
// 这里PWM配置PwmPres1Div4, 从PCLK = 80MHZ四分频为20MHZ;
// PWM clock = 20MHZ(0.05us), cycle = (1+pwm_cycle)*0.05us
// PWM clock = 20MHZ(0.05us), duty = (1+pwm_duty)*0.05us
Bt_Pwm_WriteCycleVal(&USER_BT, pwm_cycle); // Cycle = (1+m)*PWM clock cycle = 50us
Bt_Pwm_WriteDutyVal(&USER_BT, pwm_duty); // Duty = (1+m)*PWM clock cycle = 5us
// Enable Interrupt
// 指定三个中断函数;
stcPwmIntSel.bPwmTrigInt = 1;
stcPwmIntSel.bPwmDutyMatchInt = 1;
stcPwmIntSel.bPwmUnderflowInt = 1;
stcPwmIntCallback.pfnPwmTrigIntCallback = PwmTrigIntHandler;
stcPwmIntCallback.pfnPwmDutyMatchIntCallback = PwmDutyMatchIntHandler;
stcPwmIntCallback.pfnPwmUnderflowIntCallback = PwmUnderflowIntHandler;
Bt_Pwm_EnableInt(&USER_BT, &stcPwmIntSel, &stcPwmIntCallback);
// Enable count operatoin
// 计数使能
Bt_Pwm_EnableCount(&USER_BT);
// Start triggered by software
// 软件给出trigger信号，此时计时器才会开始计数;
Bt_Pwm_EnableSwTrig(&USER_BT);
}
/**
******************************************************************************
** \brief Main function of PDL
**
** \return uint32_t return value, if needed
******************************************************************************/
int32_t main(void)
{
uint8_t u8Counter;
stc_dstc_config_t stcDstcConfig;
stc_bt_pwm_config_t stcPwmConfig;
stc_pwm_irq_en_t stcPwmIrqEn;
boolean_t bCompareError = FALSE;
PDL_ZERO_STRUCT(stcDstcConfig);
PDL_ZERO_STRUCT(stcPwmConfig);
PDL_ZERO_STRUCT(stcPwmIrqEn);
// Fill Source Data
for (u8Counter = 0; u8Counter < DSTC_MAXDATA; u8Counter++)
{
// "Random" data
au32SourceData[u8Counter] = ((u8Counter << 8u) ^ 0x12345678u) + u8Counter;
}
// Initialize BT interrupts
stcPwmIrqEn.bPwmUnderflowIrq = TRUE;
// Set requested BT I/O mode
Bt_ConfigIOMode(&BT0, BtIoMode0);
// Initialize BT as PWM timer
stcPwmConfig.enPres = PwmPres1Div4;
stcPwmConfig.enMode = PwmOneshot;
stcPwmConfig.enExtTrig = PwmExtTrigDisable;
stcPwmConfig.enOutputMask = PwmOutputNormal;
stcPwmConfig.enOutputPolarity = PwmPolarityLow;
stcPwmConfig.enRestartEn = PwmRestartDisable;
stcPwmConfig.pstcPwmIrqEn = &stcPwmIrqEn;
stcPwmConfig.bTouchNvic = TRUE;
Bt_Pwm_Init(&BT0, &stcPwmConfig);
Bt_Pwm_WriteCycleVal(&BT0, 55655u); // just some values ...
Bt_Pwm_WriteDutyVal(&BT0, 33u);
// Enable BT count operatoin
Bt_Pwm_EnableCount(&BT0);
// Init Descriptor set for DES0, DES1, DES2, DES3, DES4, DES6
// DES0
stcDstcExample.DES0.DV = 1u;
stcDstcExample.DES0.ST = 0u;
stcDstcExample.DES0.MODE = 0u; // Mode 0
stcDstcExample.DES0.ORL = 0u; // No reload from DES4, DES5, DES6. The descriptor only includes DES0, DES1, DES2, DES3.
stcDstcExample.DES0.TW = 2u; // 32 Bit
stcDstcExample.DES0.SAC = 1u; // The address is increased by TW¡Á1 at every transfer with InnerReload.
stcDstcExample.DES0.DAC = 0u; // The address is increased by TW¡Á1 at every transfer without InnerReload.
stcDstcExample.DES0.CHRS = 0x10u; // An interrupt flag has been set when IRM =1 and ORM = 1
stcDstcExample.DES0.DMSET = 0u; // Set BT0 mask bit
stcDstcExample.DES0.ACK = 1u; // Send acknowledge to BT0
stcDstcExample.DES0.CHLK = 0u;
stcDstcExample.DES0.PCHK = DSTC_PCHK_CALC(stcDstcExample.u32DES0);
// DES1
stcDstcExample.DES1_mode0.ORM = 1u;
stcDstcExample.DES1_mode0.IIN = DSTC_MAXDATA;
// DES2
stcDstcExample.DES2 = (uint32_t)&au32SourceData[0];
// DES3
stcDstcExample.DES3 = (uint32_t)&au32DestinationData[0];
// Configure DSTC
stcDstcConfig.u32Destp = (uint32_t)&stcDstcExample;
stcDstcConfig.bSwInterruptEnable = FALSE;
stcDstcConfig.bErInterruptEnable = TRUE;
stcDstcConfig.bReadSkipBufferDisable = FALSE;
stcDstcConfig.bErrorStopEnable = TRUE;
stcDstcConfig.enSwTransferPriority = Priority1_31;
stcDstcConfig.pfnErrorCallback = &Main_DstcErrorCallback;
stcDstcConfig.pfnDstcBt0Irq0Callback = &Main_DstcBt0Callback;
stcDstcConfig.bTouchNvic = TRUE;
Dstc_Init(&stcDstcConfig);
Dstc_SetCommand(CmdErclr);
Dstc_SetCommand(CmdRbclr);
Dstc_SetHwdesp(DSTC_IRQ_NUMBER_BT0_IRQ0, 0u); // BT0, DES Offset 0
Dstc_SetDreqenbBit(DSTC_IRQ_NUMBER_BT0_IRQ0); // Switch BT0 to DSTC
// Start BT triggered by software
Bt_Pwm_EnableSwTrig(&BT0);
while(FALSE == bDtscEndNotify)
{}
if (TRUE == bDstcErrorFlasg)
{
// Error handling
}
else
{
for (u8Counter = 0; u8Counter < DSTC_MAXDATA; u8Counter++)
{
// Check destination data
if (au32SourceData[u8Counter] != au32DestinationData[u8Counter])
{
bCompareError = TRUE;
break;
}
}
}
if (TRUE == bCompareError)
{
// Error handling here ...
__NOP();
}
while(1)
{}
}
