Part Number: LP-AM13E230
Other Parts Discussed in Thread: AM13E23019, SYSCONFIG
Hi,
The AM13E23019 SDK doesn't have any examples of how to use UART with DMA; in fact, it doesn't have any examples of how to use any peripheral with DMA. Therefore, I need an example of how to transmit via UART using DMA, or at least some guidance on how to configure a project for this and which functions to use.
Ari
Ok, My actual application is pretty complicated as I need to implement a custom protocol based on UART. It involves upto 6-7 DMAs and Timers chained together for my requirement. I am facing some basic issues. I have created stripped down version of my application as specified below.
Goal
Transmit the data from txbuffer using DMA and Receive the data using DMA into the rxbuffer. I am not using the Tx and Rx FIFO thresholds.
Configurations for UART5 (specifying important and nondefault values)
TX DMA : APP_DMACH_UC5_TX
RX DMA : APP_DMACH_UC5_RX
#define MML_TX_BUFFER_SIZE (90)
#define MML_RX_BUFFER_SIZE (128)
uint8_t txbuffer[MML_TX_BUFFER_SIZE] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89};
uint8_t rxbuffer[MML_RX_BUFFER_SIZE];
int main()
{
Diag_InitCounters(); // Clear the counters used for debugging
Device_Init();
/* Resetting the DMA Channels */
DL_DMA_resetChannel(APP_DMACH_UC5_TX_DMA_INST, APP_DMACH_UC5_TX_CHANNEL_ID);
DL_DMA_resetChannel(APP_DMACH_UC5_RX_DMA_INST, APP_DMACH_UC5_RX_CHANNEL_ID);
DL_UART_reset(APP_UART_0_INST);
SYSCFG_DL_init();
/* Clear TX and RX Fifo */
UC5_UART->IFLS |= 0x88;
/* Clearing all pending interrupts for UART */
DL_UART_clearInterruptStatus(APP_UART_0_INST, 0xFFFFFFFF);
/* TX DMA Configuration */
DL_DMA_setSrcAddr(APP_DMACH_UC5_TX_DMA_INST, APP_DMACH_UC5_TX_CHANNEL_ID, (uint32_t)txbuffer);
DL_DMA_setDestAddr(APP_DMACH_UC5_TX_DMA_INST, APP_DMACH_UC5_TX_CHANNEL_ID, (uint32_t)&UC5_UART->TXDATA);
DL_DMA_setTransferSize(APP_DMACH_UC5_TX_DMA_INST, APP_DMACH_UC5_TX_CHANNEL_ID, MML_TX_BUFFER_SIZE);
DL_DMA_enableChannel(APP_DMACH_UC5_TX_DMA_INST, APP_DMACH_UC5_TX_CHANNEL_ID);
/* RX DMA Configuration */
DL_DMA_setSrcAddr(APP_DMACH_UC5_RX_DMA_INST, APP_DMACH_UC5_RX_CHANNEL_ID, (uint32_t)&UC5_UART->RXDATA);
DL_DMA_setDestAddr(APP_DMACH_UC5_RX_DMA_INST, APP_DMACH_UC5_RX_CHANNEL_ID, (uint32_t)rxbuffer);
DL_DMA_setTransferSize(APP_DMACH_UC5_RX_DMA_INST, APP_DMACH_UC5_RX_CHANNEL_ID, MML_RX_BUFFER_SIZE);
DL_DMA_enableChannel(APP_DMACH_UC5_RX_DMA_INST, APP_DMACH_UC5_RX_CHANNEL_ID);
/* For Logic Analyser Time Marking */
BSP_AM13E230_E2::Debug10Pin_Low();
DEVICE_DELAY_MS(100);
BSP_AM13E230_E2::Debug10Pin_High();
DEVICE_DELAY_MS(100);
BSP_AM13E230_E2::Debug10Pin_Low();
soft_timer1.Start(); /* 1ms loop */
soft_timer2.Start(); /* 10ms loop */
soft_timer3.Start(); /* 100ms loop */
soft_timer4.Start(); /* 1000ms loop */
// DL_UART_disable(APP_UART_0_INST);
// DL_UART_enableDMATransmitEvent(APP_UART_0_INST);
// DL_UART_enable(APP_UART_0_INST);
LOG("Entering While Loop \r\n");
while (1)
{
g_diagCounters.mainLoopCnt++;
/* Run all timers periodically */
us32 currentTime = Millis::GetMs();
soft_timer1.PeriodicRun(currentTime);
soft_timer2.PeriodicRun(currentTime);
soft_timer3.PeriodicRun(currentTime);
soft_timer4.PeriodicRun(currentTime);
}
return 0;
}
I am triggering the UART DMA by calling this function in one second loop
DL_UART_transmitData(APP_UART_0_INST, txbuffer[0]);
