diff options
Diffstat (limited to 'software/mpu/src/uart.c')
| -rw-r--r-- | software/mpu/src/uart.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/software/mpu/src/uart.c b/software/mpu/src/uart.c new file mode 100644 index 0000000..6626dfc --- /dev/null +++ b/software/mpu/src/uart.c @@ -0,0 +1,198 @@ +/*****************************************************************************
+ * uart.c: UART API file for NXP LPC13xx Family Microprocessors
+ *
+ * Copyright(C) 2008, NXP Semiconductor
+ * All rights reserved.
+ *
+ * History
+ * 2008.08.21 ver 1.00 Preliminary version, first Release
+ *
+******************************************************************************/
+#include "LPC13xx.h"
+#include "uart.h"
+
+#include "Types.h"
+#include "FreeRTOS.h"
+#include "queue.h"
+
+
+// CodeRed - change for CMSIS 1.3
+#define SystemFrequency SystemCoreClock
+
+extern volatile QH_t qh;
+
+volatile uint32_t UARTStatus;
+volatile uint8_t UARTTxEmpty = 1;
+volatile uint8_t UARTBuffer[BUFSIZE];
+volatile uint32_t UARTCount = 0;
+
+/*****************************************************************************
+** Function name: UART_IRQHandler
+**
+** Descriptions: UART interrupt handler
+**
+** parameters: None
+** Returned value: None
+**
+*****************************************************************************/
+void UART_IRQHandler(void)
+{
+ uint8_t IIRValue, LSRValue;
+ uint8_t Dummy = Dummy;
+ Message_t SndMsg;
+
+ IIRValue = LPC_UART->IIR;
+
+ IIRValue >>= 1; /* skip pending bit in IIR */
+ IIRValue &= 0x07; /* check bit 1~3, interrupt identification */
+ if (IIRValue == IIR_RLS) /* Receive Line Status */
+ {
+ LSRValue = LPC_UART->LSR;
+ /* Receive Line Status */
+ if (LSRValue & (LSR_OE | LSR_PE | LSR_FE | LSR_RXFE | LSR_BI))
+ {
+ /* There are errors or break interrupt */
+ /* Read LSR will clear the interrupt */
+ UARTStatus = LSRValue;
+ Dummy = LPC_UART->RBR; /* Dummy read on RX to clear
+ interrupt, then bail out */
+ return;
+ }
+ if (LSRValue & LSR_RDR) /* Receive Data Ready */
+ {
+ /* If no error on RLS, normal ready, save into the data buffer. */
+ /* Note: read RBR will clear the interrupt */
+ UARTBuffer[UARTCount++] = LPC_UART->RBR;
+ if (UARTCount == BUFSIZE)
+ {
+ UARTCount = 0; /* buffer overflow */
+ }
+ }
+ }
+ else if (IIRValue == IIR_RDA) /* Receive Data Available */
+ {
+ /* Receive Data Available */
+ UARTBuffer[UARTCount++] = LPC_UART->RBR;
+ if (UARTCount == BUFSIZE)
+ {
+ UARTCount = 0; /* buffer overflow */
+ }
+ }
+ else if (IIRValue == IIR_CTI) /* Character timeout indicator */
+ {
+ /* Character Time-out indicator */
+ UARTStatus |= 0x100; /* Bit 9 as the CTI error */
+ }
+ else if (IIRValue == IIR_THRE) /* THRE, transmit holding register empty */
+ {
+ /* THRE interrupt */
+ LSRValue = LPC_UART->LSR; /* Check status in the LSR to see if
+ valid data in U0THR or not */
+ if (LSRValue & LSR_THRE)
+ {
+ UARTTxEmpty = 1;
+ }
+ else
+ {
+ UARTTxEmpty = 0;
+ }
+ }
+ SndMsg.Sender = Sender_UART;
+ xQueueSendFromISR(qh.hxq_Kernel, &SndMsg, 0);
+
+ return;
+}
+
+/*****************************************************************************
+** Function name: UARTInit
+**
+** Descriptions: Initialize UART0 port, setup pin select,
+** clock, parity, stop bits, FIFO, etc.
+**
+** parameters: UART baudrate
+** Returned value: None
+**
+*****************************************************************************/
+void UARTInit(uint32_t baudrate)
+{
+ uint32_t Fdiv;
+ uint32_t regVal;
+
+ UARTTxEmpty = 1;
+ UARTCount = 0;
+
+ NVIC_DisableIRQ(UART_IRQn);
+
+ LPC_IOCON->PIO1_6 &= ~0x07; /* UART I/O config */
+ LPC_IOCON->PIO1_6 |= 0x01; /* UART RXD */
+ LPC_IOCON->PIO1_7 &= ~0x07;
+ LPC_IOCON->PIO1_7 |= 0x01; /* UART TXD */
+ /* Enable UART clock */
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<12);
+ LPC_SYSCON->UARTCLKDIV = 0x1; /* divided by 1 */
+
+ LPC_UART->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
+ regVal = LPC_SYSCON->UARTCLKDIV;
+ Fdiv = (((SystemFrequency/LPC_SYSCON->SYSAHBCLKDIV)/regVal)/16)/baudrate ; /*baud rate */
+
+ LPC_UART->DLM = Fdiv / 256;
+ LPC_UART->DLL = Fdiv % 256;
+ LPC_UART->LCR = 0x03; /* DLAB = 0 */
+ LPC_UART->FCR = 0x07; /* Enable and reset TX and RX FIFO. */
+
+ /* Read to clear the line status. */
+ regVal = LPC_UART->LSR;
+
+ /* Ensure a clean start, no data in either TX or RX FIFO. */
+// CodeRed - added parentheses around comparison in operand of &
+ while (( LPC_UART->LSR & (LSR_THRE|LSR_TEMT)) != (LSR_THRE|LSR_TEMT) );
+ while ( LPC_UART->LSR & LSR_RDR )
+ {
+ regVal = LPC_UART->RBR; /* Dump data from RX FIFO */
+ }
+
+ /* Enable the UART Interrupt */
+ NVIC_EnableIRQ(UART_IRQn);
+
+#if TX_INTERRUPT
+ LPC_UART->IER = IER_RBR | IER_THRE | IER_RLS; /* Enable UART interrupt */
+#else
+ LPC_UART->IER = IER_RBR | IER_RLS; /* Enable UART interrupt */
+#endif
+ return;
+}
+
+/*****************************************************************************
+** Function name: UARTSend
+**
+** Descriptions: Send a block of data to the UART 0 port based
+** on the data length
+**
+** parameters: buffer pointer, and data length
+** Returned value: None
+**
+*****************************************************************************/
+void UARTSend(uint8_t *BufferPtr, uint32_t Length)
+{
+
+ while ( Length != 0 )
+ {
+ /* THRE status, contain valid data */
+#if !TX_INTERRUPT
+ while ( !(LPC_UART->LSR & LSR_THRE) );
+ LPC_UART->THR = *BufferPtr;
+#else
+ /* Below flag is set inside the interrupt handler when THRE occurs. */
+ while ( !(UARTTxEmpty & 0x01) );
+ LPC_UART->THR = *BufferPtr;
+ UARTTxEmpty = 0; /* not empty in the THR until it shifts out */
+#endif
+ BufferPtr++;
+ Length--;
+ }
+ return;
+}
+
+/******************************************************************************
+** End Of File
+******************************************************************************/
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