/*********************************************************************//**
* @brief c_entry: Main DAC program body
* @param[in] None
* @return int
**********************************************************************/
int c_entry(void)
{
PINSEL_CFG_Type PinCfg;
DAC_CONVERTER_CFG_Type DAC_ConverterConfigStruct;
GPDMA_LLI_Type DMA_LLI_Struct;
uint32_t tmp;
uint32_t i;
uint32_t sin_0_to_90_16_samples[16]={\
0,1045,2079,3090,4067,\
5000,5877,6691,7431,8090,\
8660,9135,9510,9781,9945,10000\
};
uint32_t dac_sine_lut[NUM_SINE_SAMPLE];
/*
* Init DAC pin connect
* AOUT on P0.26
*/
PinCfg.Funcnum = 2;
PinCfg.OpenDrain = 0;
PinCfg.Pinmode = 0;
PinCfg.Pinnum = 26;
PinCfg.Portnum = 0;
PINSEL_ConfigPin(&PinCfg);
//Prepare DAC sine look up table
for(i=0;i<NUM_SINE_SAMPLE;i++)
{
if(i<=15)
{
dac_sine_lut[i] = 512 + 512*sin_0_to_90_16_samples[i]/10000;
if(i==15) dac_sine_lut[i]= 1023;
}
else if(i<=30)
{
dac_sine_lut[i] = 512 + 512*sin_0_to_90_16_samples[30-i]/10000;
}
else if(i<=45)
{
dac_sine_lut[i] = 512 - 512*sin_0_to_90_16_samples[i-30]/10000;
}
else
{
dac_sine_lut[i] = 512 - 512*sin_0_to_90_16_samples[60-i]/10000;
}
dac_sine_lut[i] = (dac_sine_lut[i]<<6);
}
//Prepare DMA link list item structure
DMA_LLI_Struct.SrcAddr= (uint32_t)dac_sine_lut;
DMA_LLI_Struct.DstAddr= (uint32_t)&(LPC_DAC->DACR);
DMA_LLI_Struct.NextLLI= (uint32_t)&DMA_LLI_Struct;
DMA_LLI_Struct.Control= DMA_SIZE
| (2<<18) //source width 32 bit
| (2<<21) //dest. width 32 bit
| (1<<26) //source increment
;
/* GPDMA block section -------------------------------------------- */
/* Initialize GPDMA controller */
GPDMA_Init();
// Setup GPDMA channel --------------------------------
// channel 0
GPDMACfg.ChannelNum = 0;
// Source memory
GPDMACfg.SrcMemAddr = (uint32_t)(dac_sine_lut);
// Destination memory - unused
GPDMACfg.DstMemAddr = 0;
// Transfer size
GPDMACfg.TransferSize = DMA_SIZE;
// Transfer width - unused
GPDMACfg.TransferWidth = 0;
// Transfer type
GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_M2P;
// Source connection - unused
GPDMACfg.SrcConn = 0;
// Destination connection
GPDMACfg.DstConn = GPDMA_CONN_DAC;
// Linker List Item - unused
GPDMACfg.DMALLI = (uint32_t)&DMA_LLI_Struct;
// Setup channel with given parameter
GPDMA_Setup(&GPDMACfg);
DAC_ConverterConfigStruct.CNT_ENA =SET;
DAC_ConverterConfigStruct.DMA_ENA = SET;
DAC_Init(LPC_DAC);
/* set time out for DAC*/
tmp = (PCLK_DAC_IN_MHZ*1000000)/(SINE_FREQ_IN_HZ*NUM_SINE_SAMPLE);
DAC_SetDMATimeOut(LPC_DAC,tmp);
DAC_ConfigDAConverterControl(LPC_DAC, &DAC_ConverterConfigStruct);
// Enable GPDMA channel 0
GPDMA_ChannelCmd(0, ENABLE);
while (1);
return 1;
}
/*********************************************************************//**
* @brief c_entry: Main DAC program body
* @param[in] None
* @return None
**********************************************************************/
void c_entry(void)
{
DAC_CONVERTER_CFG_Type DAC_ConverterConfigStruct;
uint32_t dac_value = 0;
volatile uint32_t i;
/* GPDMA block section -------------------------------------------- */
/* Disable GPDMA interrupt */
NVIC_DisableIRQ(DMA_IRQn);
/* preemption = 1, sub-priority = 1 */
NVIC_SetPriority(DMA_IRQn, ((0x01 << 3) | 0x01));
DAC_ConverterConfigStruct.CNT_ENA =SET;
DAC_ConverterConfigStruct.DMA_ENA = SET;
DAC_Init(0);
/* set time out for DAC*/
DAC_SetDMATimeOut(0, 0xFFFF);
DAC_ConfigDAConverterControl(0, &DAC_ConverterConfigStruct);
/* Initialize GPDMA controller */
GPDMA_Init();
// Setup GPDMA channel --------------------------------
// channel 0
GPDMACfg.ChannelNum = 0;
// Source memory
GPDMACfg.SrcMemAddr = (uint32_t)(&dac_value);
// Destination memory - unused
GPDMACfg.DstMemAddr = 0;
// Transfer size
GPDMACfg.TransferSize = DMA_SIZE;
// Transfer width - unused
GPDMACfg.TransferWidth = 0;
// Transfer type
GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_M2P;
// Source connection - unused
GPDMACfg.SrcConn = 0;
// Destination connection
GPDMACfg.DstConn = GPDMA_CONN_DAC;
// Linker List Item - unused
GPDMACfg.DMALLI = 0;
// Setup channel with given parameter
GPDMA_Setup(&GPDMACfg);
/* Reset terminal counter */
Channel0_TC = 0;
/* Reset Error counter */
Channel0_Err = 0;
/* Enable GPDMA interrupt */
NVIC_EnableIRQ(DMA_IRQn);
/* Wait for GPDMA processing complete */
while (1)
{
// Enable GPDMA channel 0
GPDMA_ChannelCmd(0, ENABLE);
while ((Channel0_TC == 0) );
// Disable GPDMA channel 0
GPDMA_ChannelCmd(0, DISABLE);
dac_value ++;
if (dac_value == 0x3FF)
dac_value = 0;
//delay
for(i=0;i<100000;i++);
/* Reset terminal counter */
Channel0_TC = 0;
// Re-setup channel
GPDMA_Setup(&GPDMACfg);
}
}
