Posted on March 18, 2015 at 12:54
Sorry Clive,
The spellchecker playing tricks on me. It's the price you pay for not knowing English well.
The DMA is well sized and interrupt each half. From serious table ideal, I do not know how. Could you give me an example. Anyway you step the code that I modified.
uint16_t SRC_Buffer [SPWM_ELEMENTS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
uint16_t Tabla_Buffer [5][DISPAROS] = {
{270 , 319 , 539 , 591 , 829 , 898 , 1159 , 1239 , 1504 , 1593 , 1855 , 1951 , 2210 , 2310 , 2565 , 2669 , 2922 , 3028 , 3280 }, // K = 0.3
{251 , 316 , 523 , 594 , 816 , 908 , 1145 , 1252 , 1488 , 1607 , 1838 , 1965 , 2192 , 2325 , 2547 , 2685 , 2904 , 3045 , 3262 }, // K = 0.4
{233 , 314 , 508 , 599 , 803 , 918 , 1130 , 1264 , 1472 , 1620 , 1821 , 1980 , 2174 , 2341 , 2529 , 2702 , 2886 , 3062 , 3244 }, // K = 0.5
{216 , 314 , 495 , 606 , 791 , 929 , 1116 , 1276 , 1456 , 1633 , 1803 , 1993 , 2155 , 2355 , 2510 , 2718 , 2867 , 3079 , 3226 }, // K = 0.6
{199 , 314 , 481 , 613 , 779 , 940 , 1102 , 1287 , 1439 , 1645 , 1784 , 2006 , 2135 , 2369 , 2489 , 2733 , 2847 , 3096 , 3208 } // K = 0.7
};
void TIM1_CC_IRQHandler(void)
{
static bool semiciclo;
/* check if the TIM1_CC4 interrupt has occurred */
if (TIM_GetITStatus(TIM1, TIM_IT_CC4) != RESET)
{
/* clear the TIM1_CC4 interrupt pending bits */
TIM_ClearITPendingBit(TIM1, TIM_IT_CC4);
}
TIM1->CNT = 0; /* Reset the counter back to zero */
/* Set up data for DMA-transfer */
semiciclo = !semiciclo;
if (semiciclo)
{
TIM1->CCR1 = SRC_Buffer[0] = Tabla_Buffer [Tabla][0];
SRC_Buffer[1] = Tabla_Buffer [Tabla][1];
SRC_Buffer[2] = Tabla_Buffer [Tabla][2];
SRC_Buffer[3] = Tabla_Buffer [Tabla][3];
SRC_Buffer[4] = Tabla_Buffer [Tabla][4];
SRC_Buffer[5] = Tabla_Buffer [Tabla][5];
SRC_Buffer[6] = Tabla_Buffer [Tabla][6];
SRC_Buffer[7] = Tabla_Buffer [Tabla][7];
SRC_Buffer[8] = Tabla_Buffer [Tabla][8];
SRC_Buffer[9] = Tabla_Buffer [Tabla][9];
SRC_Buffer[10] = Tabla_Buffer [Tabla][10];
SRC_Buffer[11] = Tabla_Buffer [Tabla][11];
SRC_Buffer[12] = Tabla_Buffer [Tabla][12];
SRC_Buffer[13] = Tabla_Buffer [Tabla][13];
SRC_Buffer[14] = Tabla_Buffer [Tabla][14];
SRC_Buffer[15] = Tabla_Buffer [Tabla][15];
SRC_Buffer[16] = Tabla_Buffer [Tabla][16];
SRC_Buffer[17] = Tabla_Buffer [Tabla][17];
SRC_Buffer[18] = Tabla_Buffer [Tabla][18]; //(5000 + (5000 - Tabla_Buffer [Tabla][18]));/*Pulso central entre 60º y 120º */;
GPIO_WriteBit(GPIOE,GPIO_Pin_9,Bit_SET);
}
else
{
TIM1->CCR1 = SRC_Buffer[0] = (5000 - Tabla_Buffer [Tabla][18]);
SRC_Buffer[1] = (5000 - Tabla_Buffer [Tabla][17]);
SRC_Buffer[2] = (5000 - Tabla_Buffer [Tabla][16]);
SRC_Buffer[3] = (5000 - Tabla_Buffer [Tabla][15]);
SRC_Buffer[4] = (5000 - Tabla_Buffer [Tabla][14]);
SRC_Buffer[5] = (5000 - Tabla_Buffer [Tabla][13]);
SRC_Buffer[6] = (5000 - Tabla_Buffer [Tabla][12]);
SRC_Buffer[7] = (5000 - Tabla_Buffer [Tabla][11]);
SRC_Buffer[8] = (5000 - Tabla_Buffer [Tabla][10]);
SRC_Buffer[9] = (5000 - Tabla_Buffer [Tabla][9]);
SRC_Buffer[10] = (5000 - Tabla_Buffer [Tabla][8]);
SRC_Buffer[11] = (5000 - Tabla_Buffer [Tabla][7]);
SRC_Buffer[12] = (5000 - Tabla_Buffer [Tabla][6]);
SRC_Buffer[13] = (5000 - Tabla_Buffer [Tabla][5]);
SRC_Buffer[14] = (5000 - Tabla_Buffer [Tabla][4]);
SRC_Buffer[15] = (5000 - Tabla_Buffer [Tabla][3]);
SRC_Buffer[16] = (5000 - Tabla_Buffer [Tabla][2]);
SRC_Buffer[17] = (5000 - Tabla_Buffer [Tabla][1]);
SRC_Buffer[18] = (5000 - Tabla_Buffer [Tabla][0]);
GPIO_WriteBit(GPIOE,GPIO_Pin_9,Bit_RESET);
}
/* Next interrupt to occur after 5 ms */
TIM1->CCR4 = 5000;
}
Need guidance on HT (Half Transfer) and TC (Terminal Count) may be the solution.
Very grateful for your prompt reply. I hope your coments.
DMA_InitStructure.DMA_Channel = DMA_Channel_6;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(TIM1_CCR1_ADDRESS);
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)SRC_Buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_BufferSize = SPWM_ELEMENTS; // Nº data items to transfer
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream1, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream1, ENABLE); // enable DMA2_Stream1
I is correct expected output. II is wrong in this case the wrong ramp profile and driver consider wrong first step .As driver considers first rising edge as first step
