TMS320F28379D: SDFM

能否给出您现在使用的软硬件详细情况？

jinyan fan 说：

SDIFLG 的 Modulator failure for Filter 1~Modulator failure for Filter 4全部为1，时钟与码流都进入SD,SC脚了

请给出相关的说明或截图，谢谢

PWM1给出6.25M的时钟，1305输出的码流正常。 Modulator failure for Filter 1正常了。但是还是读不到转换值。

以下是SDFM配置

void main(void)
{
uint16_t pinMuxoption;
uint16_t HLT, LLT;
InitSysCtrl();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
EALLOW;
PieVectTable.SD1_INT = &Sdfm1_ISR;
PieVectTable.SD2_INT = &Sdfm2_ISR;
EDIS;

EALLOW;

IER |= M_INT5;

PieCtrlRegs.PIEIER5.bit.INTx9 = 1; // SDFM1 interrupt enabled
PieCtrlRegs.PIEIER5.bit.INTx10 = 1; // SDFM2 interrupt enabled
EINT;

#ifdef CPU1
pinMuxoption = SDFM_PIN_MUX_OPTION3;
Sdfm_configurePins(pinMuxoption);
#endif

gPeripheralNumber = SDFM1;

Sdfm_configureInputCtrl(gPeripheralNumber, FILTER1, MODE_0);
Sdfm_configureInputCtrl(gPeripheralNumber, FILTER2, MODE_0);
Sdfm_configureInputCtrl(gPeripheralNumber, FILTER3, MODE_0);
Sdfm_configureInputCtrl(gPeripheralNumber, FILTER4, MODE_0);

HLT = 0x7FFF; //Over value threshold settings
LLT = 0x0000; //Under value threshold settings

Sdfm_configureComparator(gPeripheralNumber, FILTER1, SINC3, OSR_32,
HLT, LLT);
Sdfm_configureComparator(gPeripheralNumber, FILTER2, SINC3, OSR_32,
HLT, LLT);
Sdfm_configureComparator(gPeripheralNumber, FILTER3, SINC3, OSR_32,
HLT, LLT);
Sdfm_configureComparator(gPeripheralNumber, FILTER4, SINC3, OSR_32,
HLT, LLT);

Sdfm_enableMFE(gPeripheralNumber);

Sdfm_configureData_filter(gPeripheralNumber, FILTER1, FILTER_ENABLE, SINC3,
OSR_256, DATA_16_BIT, SHIFT_0_BITS);
// Sdfm_configureData_filter(gPeripheralNumber, FILTER2, FILTER_ENABLE, SINC3,
// OSR_256, DATA_16_BIT, SHIFT_9_BITS);
// Sdfm_configureData_filter(gPeripheralNumber, FILTER3, FILTER_ENABLE, SINC3,
// OSR_256, DATA_16_BIT, SHIFT_9_BITS);
// Sdfm_configureData_filter(gPeripheralNumber, FILTER4, FILTER_ENABLE, SINC3,
// OSR_256, DATA_16_BIT, SHIFT_9_BITS);

Sdfm_configureExternalreset(gPeripheralNumber,FILTER_1_EXT_RESET_ENABLE,
FILTER_2_EXT_RESET_ENABLE,
FILTER_3_EXT_RESET_ENABLE,
FILTER_4_EXT_RESET_ENABLE);

InitEPwm();

Sdfm_configureInterrupt(gPeripheralNumber, FILTER1, IEH_DISABLE,
IEL_DISABLE, MFIE_ENABLE, AE_ENABLE);
Sdfm_configureInterrupt(gPeripheralNumber, FILTER2, IEH_DISABLE,
IEL_DISABLE, MFIE_ENABLE, AE_ENABLE);
Sdfm_configureInterrupt(gPeripheralNumber, FILTER3, IEH_DISABLE,
IEL_DISABLE, MFIE_ENABLE, AE_ENABLE);
Sdfm_configureInterrupt(gPeripheralNumber, FILTER4, IEH_DISABLE,
IEL_DISABLE, MFIE_ENABLE, AE_ENABLE);

while((*EPWM[gPWM_number]).TBCTR < 3);

Sdfm_enableMIE(gPeripheralNumber);

下面是对SDFM数据寄存器读取转换值，中断能过来，感觉是FM2，3，4产生的中断，不是转换结束的中断。

__interrupt void Sdfm1_ISR(void)
{

static uint16_t loopCounter1 = 0;
test4++;
//
// Read SDFM flag register (SDIFLG)
//
sdfmReadFlagRegister = Sdfm_readFlagRegister(gPeripheralNumber);

if(loopCounter1 < MAX_SAMPLES)
{
//
// Read each SDFM filter output and store it in respective filter
// result array
//
 Filter1_Result[loopCounter1] = SDFM1_READ_FILTER1_DATA_16BIT;
 Filter2_Result[loopCounter1] = SDFM1_READ_FILTER2_DATA_16BIT;
 Filter3_Result[loopCounter1] = SDFM1_READ_FILTER3_DATA_16BIT;
 Filter4_Result[loopCounter1++] = SDFM1_READ_FILTER4_DATA_16BIT;

// Clear SDFM flag register
//
//Sdfm_clearFlagRegister(gPeripheralNumber,sdfmReadFlagRegister);
//sdfmReadFlagRegister = Sdfm_readFlagRegister(gPeripheralNumber);

if(sdfmReadFlagRegister != 0x0)
{
// ESTOP0;
}
}
else
{
// ESTOP0;
// done();
}
Sdfm_clearFlagRegister(gPeripheralNumber,sdfmReadFlagRegister);
sdfmReadFlagRegister = Sdfm_readFlagRegister(gPeripheralNumber);
//
// Acknowledge this __interrupt to receive more __interrupts from group 5
//
PieCtrlRegs.PIEACK.all = PIEACK_GROUP5;
}

还有其他要注意的点吧，要不然会读到数值啊？

谢谢反馈。您的硬件部分呢？使用的是TI开发板还是自制板？是否有使用TI例程尝试？

是开发板啊，这个就是例程，只不过将CLK改快了。

是开发板啊，这个就是例程，只不过将CLK改快了。

用的PWM1A作为CLK

请注意

//! \b External \b Connections \n
//! - SDFM_PIN_MUX_OPTION1 Connect Sigma-Delta streams to
//! (SD-D1, SD-C1 to SD-D8,SD-C8) on GPIO16-GPIO31
//! - SDFM_PIN_MUX_OPTION2 Connect Sigma-Delta streams to
//! (SD-D1, SD-C1 to SD-D8,SD-C8) on GPIO48-GPIO63
//! - SDFM_PIN_MUX_OPTION3 Connect Sigma-Delta streams to
//! (SD-D1, SD-C1 to SD-D8,SD-C8) on GPIO122-GPIO137

您直接完全使用例程时是可以正常读出的吗？

jinyan fan 说：

用的PWM1A作为CLK

一旦您将PWM用于为 SDFM 模块提供时钟，请您检查 EPWM 输出。请您调试下程序，看会卡在哪里，是否会进入SDFM的中断

不能读出来，我们用的IO口是GPIO122，GPIO123

抱歉，手边没有AM1305，不太好测试。请您参考下面的文档

隔离信号调制器 AMC1305M25 与 F28377S 最小系统与测试

https://www.ti.com.cn/cn/lit/an/zhca818/zhca818.pdf 

该问题已经解决了，但是不知道为什么，换了例程就好了。

我还想请教个问题，SDFM采样的节奏怎么控制的，ADC采样有触发机制比如PWM触发，SDFM采样用什么来触发，如果没有触发机制，那SDFM采样岂不是要连续采样，时间上怎么与PWM中断对齐呢？