UART DMA Configuration

harry_ti

Other Parts Discussed in Thread: Z-STACK, CC2530

Hai,

I am using UART DMA to write and read from uart i have configured

My code:

void Uart_DMAInit(void)
{

HalUARTInit();
halUARTCfg_t uartConfig;
uartConfig.configured = TRUE;
uartConfig.baudRate = HAL_UART_BR_9600; //HAL_UART_BR_1M;
uartConfig.flowControl = HAL_UART_FLOW_OFF;
uartConfig.flowControlThreshold = 48;
uartConfig.rx.maxBufSize = 128; //max if DMA gets enabled, don't think it is, but just in case
uartConfig.tx.maxBufSize = 128;
uartConfig.idleTimeout = 6;
uartConfig.intEnable = TRUE;
uartConfig.callBackFunc = My_cb; //UartProcessData Callback function to read uart buff

HalUARTOpen (HAL_UART_PORT_1, &uartConfig);

HalUARTWrite(HAL_UART_PORT_1,"UART INIT", 9);

}

void My_cb ( uint8 port, uint8 event )
{
uint8 ch;
uint8 bytesInRxBuffer;

uint8 u8Recv_Buff[MAX_BUFF_SIZE];

UINT8 pu8Buff[MAX_BUFF_SIZE];
uint32 u32count;
uint32 MaxPktLen;

u32count = 0;
MaxPktLen = 0;

memset( u8Recv_Buff, 0 ,sizeof(u8Recv_Buff));

while (Hal_UART_RxBufLen(port))
{
HalUARTRead (port, &u8Recv_Buff[u32count], 1);

if ( u8Recv_Buff[u32count] == TP_RSP_SOF)
{
++u32count;
HalUARTRead (port, &u8Recv_Buff[u32count], 1);

MaxPktLen = u8Recv_Buff[u32count++];
u32count = HalUARTRead (port, &u8Recv_Buff[u32count], MaxPktLen);

}
}
memcpy(pu8Buff, &u8Recv_Buff[0], MaxPktLen);

//*u32Length = u32count;
//return u32count;
}

Configured in hal_board _cfg.h

/* Set to TRUE enable UART usage, FALSE disable it */
#ifndef HAL_UART

#if (defined ZAPP_P1) || (defined ZAPP_P2) || (defined ZTOOL_P1) || (defined ZTOOL_P2)
#define HAL_UART TRUE
#else
#define HAL_UART TRUE
#endif
#endif

But

in _hal_dma_uart.c

static void HalUARTInitDMA(void)
{
halDMADesc_t *ch;

P2DIR &= ~P2DIR_PRIPO;

P2DIR |= HAL_UART_PRIPO; what does it refer to

#if (HAL_UART_DMA == 1)
PERCFG &= ~HAL_UART_PERCFG_BIT; // Set UART0 I/O to Alt. 1 location on P0.
#else
PERCFG |= HAL_UART_PERCFG_BIT; // Set UART1 I/O to Alt. 2 location on P1.
#endif
PxSEL |= HAL_UART_Px_RX_TX;

PxDIR |= 0x40;
// Enable Tx and Rx on P1.
ADCCFG &= ~HAL_UART_Px_RX_TX; // Make sure ADC doesnt use this.
UxCSR = CSR_MODE; // Mode is UART Mode.
UxUCR = UCR_FLUSH; // Flush it.

I want to configure to USART1 Port 1

i went through D112 Doc, configured accordingly, is there any other configurations to do more ..

over 9 years ago

0 YiKai Chen over 9 years ago

Guru 735685 points

If you want to use UART port 1 in Z-Stack, you can define HAL_UART=TURE and don't define ZTOOL_P1 and ZTOOL_P2. Then, you just need to use HAL_UART_PORT_1 in "HalUARTOpen (HAL_UART_PORT_1...", "HalUARTWrite(HAL_UART_PORT_1...", and "HalUARTRead (HAL_UART_PORT_1..."

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Hai YK

Thanks for your reply , So i need to disable the ZTOOL_P1 Compiler flag In the compiler Options Right or Some other place

0 harry_ti over 9 years ago in reply to harry_ti

Expert 1400 points

I Have one more doubt

void Uart_DMAInit(void)
{

HalUARTInit();
halUARTCfg_t uartConfig;
uartConfig.configured = TRUE;
uartConfig.baudRate = HAL_UART_BR_9600; //HAL_UART_BR_1M;
uartConfig.flowControl = HAL_UART_FLOW_OFF;
uartConfig.flowControlThreshold = 48;
uartConfig.rx.maxBufSize = 128; //max if DMA gets enabled, don't think it is, but just in case
uartConfig.tx.maxBufSize = 128;
uartConfig.idleTimeout = 6;
uartConfig.intEnable = TRUE;
uartConfig.callBackFunc = My_cb; //UartProcessData Callback function to read uart buff

HalUARTOpen (HAL_UART_PORT_1, &uartConfig);

HalUARTWrite(HAL_UART_PORT_1,"UART INIT", 9);

}

I am calling HalUARTInit(); in my void Uart_DMAInit(); function is it correct place to call the Init function and

in
static void HalUARTInitDMA(void)
{
halDMADesc_t *ch;

P2DIR &= ~P2DIR_PRIPO;

P2DIR |= HAL_UART_PRIPO;

what does line 2& 3 refers to why do we use port 2. when i compile i got an error HAL_UART_PRIPO; is undifined.

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

You can refer to information of P2DIR register in CC2530 user guide.

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

Yes, you need to disable the ZTOOL_P1 Compiler flag In the compiler Options.

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Hai YK,

As You told i have done same but , i have put a break point in HalUARTInit(); to check which pins are selected , but port 0 initialised please check below New Microsoft Office Word Document.docx

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

Add define HAL_UART_DMA=2 in compile option.

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Hai YK ,

Thanks for your reply, as you told i have define HAL_UART_DMA=2, In the compiler flag , Now Port 1 is selected and configured , but when i try to send a string , i could not see any message on the serial console ,

void Uart_Hal_Init(void)
{

HalUARTInit();
halUARTCfg_t uartConfig;
uartConfig.configured = TRUE;
uartConfig.baudRate = HAL_UART_BR_9600; //HAL_UART_BR_1M;
uartConfig.flowControl = HAL_UART_FLOW_OFF;
uartConfig.flowControlThreshold = 48;
uartConfig.rx.maxBufSize = 128; //max if DMA gets enabled, don't think it is, but just in case
uartConfig.tx.maxBufSize = 128;
uartConfig.idleTimeout = 6;
uartConfig.intEnable = TRUE;
uartConfig.callBackFunc = My_cb; //UartProcessData Callback function to read uart buff

HalUARTOpen (HAL_UART_PORT_1, &uartConfig);

HalUARTWrite(HAL_UART_PORT_1,"UART INIT", 9);

}

When try to send the String no message is Displayed i have put a break point and run in step in process ,

HAL_ENTER_CRITICAL_SECTION(his);
if (txSel != dmaCfg.txSel)
{
HAL_EXIT_CRITICAL_SECTION(his);
txSel = dmaCfg.txSel;
txIdx = dmaCfg.txIdx[txSel];

for (cnt = 0; cnt < len; cnt++)
{
dmaCfg.txBuf[txSel][txIdx++] = buf[cnt];
}
HAL_ENTER_CRITICAL_SECTION(his);
}
when i reach here in For Loop , i checked the UART eregister there is no change in this bit U1CSR.TX_BYTE bit .

dmaCfg.txIdx[txSel] = txIdx;

if (dmaCfg.txIdx[(txSel ^ 1)] == 0)
{
// TX DMA is expected to be fired
dmaCfg.txDMAPending = TRUE;------------------------> It has reached here, What does it mean .
}
HAL_EXIT_CRITICAL_SECTION(his);
return cnt;
}
tell me if any more configurations need to be done

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

What pin do you check output data when you use UART write with PORT1?

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Hai YK,

I checked on P1_6 TX, P1_7 RX

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

Do you disable HAL_SUPPORTED?

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Where Can i Find it

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

Try to check compile options of your project.

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

No I don't have that in my compiler Options.. Do i Need to add it

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

What Z-Stack example and HW do you use to test UART?

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Thanks YK,
I am Using Thermostat Application,

I could able to See my Buffer in the serial console, and I enabled call back function to receive, and in my call back function i am Glowing led. I did not even connect my Rx , but my led is On.

My Code :

void Uart_Hal_Init(void)
{

HalUARTInit();
halUARTCfg_t uartConfig;
uartConfig.configured = TRUE;
uartConfig.baudRate = HAL_UART_BR_9600; //HAL_UART_BR_1M;
uartConfig.flowControl = HAL_UART_FLOW_OFF;
uartConfig.flowControlThreshold = 48;
uartConfig.rx.maxBufSize = 128; //max if DMA gets enabled, don't think it is, but just in case
uartConfig.tx.maxBufSize = 128;
uartConfig.idleTimeout = 6;
uartConfig.intEnable = TRUE;
uartConfig.callBackFunc = My_CB; //UartProcessData Callback function to read uart buff

HalUARTOpen (HAL_UART_PORT_1, &uartConfig);

//HalUARTWrite(HAL_UART_PORT_1,"UART INIT", 9);

}

void My_CB( uint8 port, uint8 event )
{

P0SEL &= 0xC0;
P0DIR |= 0xC0;

P0_6 = 1;

}

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

Try to use the following UART RX callback.

uint8 buf[128];
int read_bytes;
void My_CB(uint8 port, uint8 event) {
read_bytes=0;
while (Hal_UART_RxBufLen(port))
{
HalUARTRead (port, &buf[read_bytes], 1);
read_bytes++;
}
//You can check read_bytes and buf here.
}

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Hai YK,

Thanks for Your Valuable Answer

I have A small doubt I tried the below code

void Reveice_Rx_CB ( uint8 port, uint8 event )
{
uint8 bytesInRxBuffer;

uint8 u8Recv_Buff[MAX_BUFF_SIZE];

UINT8 pu8Buff[MAX_BUFF_SIZE];
uint32 u32count;
uint32 MaxPktLen;

u32count = 0;
MaxPktLen = 0;

memset( u8Recv_Buff, 0 ,sizeof(u8Recv_Buff));

while (Hal_UART_RxBufLen(port))
{
HalUARTRead (port, &u8Recv_Buff[u32count], 1);

if ( u8Recv_Buff[u32count] == 0xFE)
{
P0SEL &= 0xC0;
P0DIR |= 0xC0;
P0_6 = 1;

++u32count;
HalUARTRead (port, &u8Recv_Buff[u32count], 1);

MaxPktLen = u8Recv_Buff[u32count++];
u32count = HalUARTRead (port, &u8Recv_Buff[u32count], MaxPktLen);

}
}
memcpy(pu8Buff, &u8Recv_Buff[0], MaxPktLen); // Break point
}

Now if I get My 0XFE then only i will glow my Led, at this condition My Led Is glowing. Now I put Break point at memcpy ,i have removed Wire Connected to RX PIN and it Hits memcpy(pu8Buff, &u8Recv_Buff[0], MaxPktLen); How does it happen.

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

Do you mean that you disconnect RX pin but UART RX callback is triggered?

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Yes Sir

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

If you attach RX pin to VDD, do you still see UART RX callback triggered without RX signal?

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

I did not connect to VDD, I just left it floating

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

It might catch noise if you let it floating. That's why I suggest you to connect it to VDD and test again.

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Thank You Very Much Sir, I would Test it

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

You are welcome.

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

I tested it by connecting to VDD , Still The same issue.

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

How about connect it to GND?

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

I tested Both the ways Sir, MY_Cb is triggering Without Rx Signal.

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

It only comes one time when your application starts or it is triggered continuously?

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Thanks you, Call back is triggered when Initializing , Only Once

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

I think this is caused by unknown status of UART pins when system starts. I suggest you to skip it since it only happens when initialization.

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Hai Sir,

As i checked Now, UART callback function is triggering Continuously, I checked it by putting a Break point in Call back function. I disconnected UART RX connection , Even if no signal is Received , Call back is continues for ALMOST every 1 sec

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

I would suggest you to use oscilloscope to check UART RX line and see if there is noise comes every 1 second.

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Thanks for your Reply and Support, I would try it Sir

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

You are welcome.

0 harry_ti over 9 years ago in reply to YiKai Chen

Expert 1400 points

Hai, Yk

Thanks for your Support, How would i enable both UART's what are the configurations need to be done,

to Enable UART1 I have made HAL_UART_DMA=2, not it is working fine, Now i would like use uart o also for P0 2&3 pins.

0 YiKai Chen over 9 years ago in reply to harry_ti

Guru 735685 points

You can define HAL_UART=TRUE, HAL_UART_DMA=1 and HAL_UART_ISR=2 to make both UARTs work.

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UART DMA Configuration