rt-thread-official/bsp/jz47xx/uart.c

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#include <rthw.h>
#include <rtthread.h>
#include <jz4755.h>
/**
* @addtogroup Jz47xx
*/
/*@{*/
#if defined(RT_USING_UART) && defined(RT_USING_DEVICE)
#define UART_BAUDRATE 115200
#define DEV_CLK 12000000
/*
* Define macros for UARTIER
* UART Interrupt Enable Register
*/
#define UARTIER_RIE (1 << 0) /* 0: receive fifo "full" interrupt disable */
#define UARTIER_TIE (1 << 1) /* 0: transmit fifo "empty" interrupt disable */
#define UARTIER_RLIE (1 << 2) /* 0: receive line status interrupt disable */
#define UARTIER_MIE (1 << 3) /* 0: modem status interrupt disable */
#define UARTIER_RTIE (1 << 4) /* 0: receive timeout interrupt disable */
/*
* Define macros for UARTISR
* UART Interrupt Status Register
*/
#define UARTISR_IP (1 << 0) /* 0: interrupt is pending 1: no interrupt */
#define UARTISR_IID (7 << 1) /* Source of Interrupt */
#define UARTISR_IID_MSI (0 << 1) /* Modem status interrupt */
#define UARTISR_IID_THRI (1 << 1) /* Transmitter holding register empty */
#define UARTISR_IID_RDI (2 << 1) /* Receiver data interrupt */
#define UARTISR_IID_RLSI (3 << 1) /* Receiver line status interrupt */
#define UARTISR_FFMS (3 << 6) /* FIFO mode select, set when UARTFCR.FE is set to 1 */
#define UARTISR_FFMS_NO_FIFO (0 << 6)
#define UARTISR_FFMS_FIFO_MODE (3 << 6)
/*
* Define macros for UARTFCR
* UART FIFO Control Register
*/
#define UARTFCR_FE (1 << 0) /* 0: non-FIFO mode 1: FIFO mode */
#define UARTFCR_RFLS (1 << 1) /* write 1 to flush receive FIFO */
#define UARTFCR_TFLS (1 << 2) /* write 1 to flush transmit FIFO */
#define UARTFCR_DMS (1 << 3) /* 0: disable DMA mode */
#define UARTFCR_UUE (1 << 4) /* 0: disable UART */
#define UARTFCR_RTRG (3 << 6) /* Receive FIFO Data Trigger */
#define UARTFCR_RTRG_1 (0 << 6)
#define UARTFCR_RTRG_4 (1 << 6)
#define UARTFCR_RTRG_8 (2 << 6)
#define UARTFCR_RTRG_15 (3 << 6)
/*
* Define macros for UARTLCR
* UART Line Control Register
*/
#define UARTLCR_WLEN (3 << 0) /* word length */
#define UARTLCR_WLEN_5 (0 << 0)
#define UARTLCR_WLEN_6 (1 << 0)
#define UARTLCR_WLEN_7 (2 << 0)
#define UARTLCR_WLEN_8 (3 << 0)
#define UARTLCR_STOP (1 << 2) /* 0: 1 stop bit when word length is 5,6,7,8
1: 1.5 stop bits when 5; 2 stop bits when 6,7,8 */
#define UARTLCR_PE (1 << 3) /* 0: parity disable */
#define UARTLCR_PROE (1 << 4) /* 0: even parity 1: odd parity */
#define UARTLCR_SPAR (1 << 5) /* 0: sticky parity disable */
#define UARTLCR_SBRK (1 << 6) /* write 0 normal, write 1 send break */
#define UARTLCR_DLAB (1 << 7) /* 0: access UARTRDR/TDR/IER 1: access UARTDLLR/DLHR */
/*
* Define macros for UARTLSR
* UART Line Status Register
*/
#define UARTLSR_DR (1 << 0) /* 0: receive FIFO is empty 1: receive data is ready */
#define UARTLSR_ORER (1 << 1) /* 0: no overrun error */
#define UARTLSR_PER (1 << 2) /* 0: no parity error */
#define UARTLSR_FER (1 << 3) /* 0; no framing error */
#define UARTLSR_BRK (1 << 4) /* 0: no break detected 1: receive a break signal */
#define UARTLSR_TDRQ (1 << 5) /* 1: transmit FIFO half "empty" */
#define UARTLSR_TEMT (1 << 6) /* 1: transmit FIFO and shift registers empty */
#define UARTLSR_RFER (1 << 7) /* 0: no receive error 1: receive error in FIFO mode */
/*
* Define macros for UARTMCR
* UART Modem Control Register
*/
#define UARTMCR_DTR (1 << 0) /* 0: DTR_ ouput high */
#define UARTMCR_RTS (1 << 1) /* 0: RTS_ output high */
#define UARTMCR_OUT1 (1 << 2) /* 0: UARTMSR.RI is set to 0 and RI_ input high */
#define UARTMCR_OUT2 (1 << 3) /* 0: UARTMSR.DCD is set to 0 and DCD_ input high */
#define UARTMCR_LOOP (1 << 4) /* 0: normal 1: loopback mode */
#define UARTMCR_MCE (1 << 7) /* 0: modem function is disable */
/*
* Define macros for UARTMSR
* UART Modem Status Register
*/
#define UARTMSR_DCTS (1 << 0) /* 0: no change on CTS_ pin since last read of UARTMSR */
#define UARTMSR_DDSR (1 << 1) /* 0: no change on DSR_ pin since last read of UARTMSR */
#define UARTMSR_DRI (1 << 2) /* 0: no change on RI_ pin since last read of UARTMSR */
#define UARTMSR_DDCD (1 << 3) /* 0: no change on DCD_ pin since last read of UARTMSR */
#define UARTMSR_CTS (1 << 4) /* 0: CTS_ pin is high */
#define UARTMSR_DSR (1 << 5) /* 0: DSR_ pin is high */
#define UARTMSR_RI (1 << 6) /* 0: RI_ pin is high */
#define UARTMSR_DCD (1 << 7) /* 0: DCD_ pin is high */
/*
* Define macros for SIRCR
* Slow IrDA Control Register
*/
#define SIRCR_TSIRE (1 << 0) /* 0: transmitter is in UART mode 1: IrDA mode */
#define SIRCR_RSIRE (1 << 1) /* 0: receiver is in UART mode 1: IrDA mode */
#define SIRCR_TPWS (1 << 2) /* 0: transmit 0 pulse width is 3/16 of bit length
1: 0 pulse width is 1.6us for 115.2Kbps */
#define SIRCR_TXPL (1 << 3) /* 0: encoder generates a positive pulse for 0 */
#define SIRCR_RXPL (1 << 4) /* 0: decoder interprets positive pulse as 0 */
struct rt_uart_jz
{
struct rt_device parent;
rt_uint32_t hw_base;
rt_uint32_t irq;
/* buffer for reception */
rt_uint8_t read_index, save_index;
rt_uint8_t rx_buffer[RT_UART_RX_BUFFER_SIZE];
}uart_device;
static void rt_uart_irqhandler(int irqno)
{
rt_ubase_t level, isr;
struct rt_uart_jz* uart = &uart_device;
/* read interrupt status and clear it */
isr = UART_ISR(uart->hw_base);
if (isr & UARTISR_IID_RDI) /* Receive Data Available */
{
/* Receive Data Available */
while (UART_LSR(uart->hw_base) & UARTLSR_DR)
{
uart->rx_buffer[uart->save_index] = UART_RDR(uart->hw_base);
level = rt_hw_interrupt_disable();
uart->save_index ++;
if (uart->save_index >= RT_UART_RX_BUFFER_SIZE)
uart->save_index = 0;
rt_hw_interrupt_enable(level);
}
/* invoke callback */
if(uart->parent.rx_indicate != RT_NULL)
{
rt_size_t length;
if (uart->read_index > uart->save_index)
length = RT_UART_RX_BUFFER_SIZE - uart->read_index + uart->save_index;
else
length = uart->save_index - uart->read_index;
uart->parent.rx_indicate(&uart->parent, length);
}
}
return;
}
static rt_err_t rt_uart_init (rt_device_t dev)
{
rt_uint32_t baud_div;
struct rt_uart_jz *uart = (struct rt_uart_jz*)dev;
RT_ASSERT(uart != RT_NULL);
/* Init UART Hardware */
UART_IER(uart->hw_base) = 0; /* clear interrupt */
UART_FCR(uart->hw_base) = ~UARTFCR_UUE; /* disable UART unite */
/* Enable UART clock */
/* Set both receiver and transmitter in UART mode (not SIR) */
UART_SIRCR(uart->hw_base) = ~(SIRCR_RSIRE | SIRCR_TSIRE);
/* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */
UART_LCR(uart->hw_base) = UARTLCR_WLEN_8;
/* set baudrate */
baud_div = DEV_CLK / 16 / UART_BAUDRATE;
UART_LCR(uart->hw_base) |= UARTLCR_DLAB;
UART_DLHR(uart->hw_base) = (baud_div >> 8) & 0xff;
UART_DLLR(uart->hw_base) = baud_div & 0xff;
UART_LCR(uart->hw_base) &= ~UARTLCR_DLAB;
/* Enable UART unit, enable and clear FIFO */
UART_FCR(uart->hw_base) = UARTFCR_UUE | UARTFCR_FE | UARTFCR_TFLS | UARTFCR_RFLS;
return RT_EOK;
}
static rt_err_t rt_uart_open(rt_device_t dev, rt_uint16_t oflag)
{
struct rt_uart_jz *uart = (struct rt_uart_jz*)dev;
RT_ASSERT(uart != RT_NULL);
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* Enable the UART Interrupt */
UART_IER(uart->hw_base) |= (UARTIER_RIE | UARTIER_RTIE);
/* install interrupt */
rt_hw_interrupt_install(uart->irq, rt_uart_irqhandler, RT_NULL);
rt_hw_interrupt_umask(uart->irq);
}
return RT_EOK;
}
static rt_err_t rt_uart_close(rt_device_t dev)
{
struct rt_uart_jz *uart = (struct rt_uart_jz*)dev;
RT_ASSERT(uart != RT_NULL);
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* Disable the UART Interrupt */
UART_IER(uart->hw_base) &= ~(UARTIER_RIE | UARTIER_RTIE);
}
return RT_EOK;
}
static rt_size_t rt_uart_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
{
rt_uint8_t* ptr;
struct rt_uart_jz *uart = (struct rt_uart_jz*)dev;
RT_ASSERT(uart != RT_NULL);
/* point to buffer */
ptr = (rt_uint8_t*) buffer;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
while (size)
{
/* interrupt receive */
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
if (uart->read_index != uart->save_index)
{
*ptr = uart->rx_buffer[uart->read_index];
uart->read_index ++;
if (uart->read_index >= RT_UART_RX_BUFFER_SIZE)
uart->read_index = 0;
}
else
{
/* no data in rx buffer */
/* enable interrupt */
rt_hw_interrupt_enable(level);
break;
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
ptr ++;
size --;
}
return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
}
return 0;
}
static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
{
char *ptr;
struct rt_uart_jz *uart = (struct rt_uart_jz*)dev;
RT_ASSERT(uart != RT_NULL);
ptr = (char*)buffer;
if (dev->flag & RT_DEVICE_FLAG_STREAM)
{
/* stream mode */
while (size)
{
if (*ptr == '\n')
{
/* FIFO status, contain valid data */
while (!((UART_LSR(uart->hw_base) & (UARTLSR_TDRQ | UARTLSR_TEMT)) == 0x60));
/* write data */
UART_TDR(uart->hw_base) = '\r';
}
/* FIFO status, contain valid data */
while (!((UART_LSR(uart->hw_base) & (UARTLSR_TDRQ | UARTLSR_TEMT)) == 0x60));
/* write data */
UART_TDR(uart->hw_base) = *ptr;
ptr ++;
size --;
}
}
else
{
while ( size != 0 )
{
/* FIFO status, contain valid data */
while ( !(UART_LSR(uart->hw_base) & (UARTLSR_TDRQ | UARTLSR_TEMT) == 0x60) );
/* write data */
UART_TDR(uart->hw_base) = *ptr;
ptr++;
size--;
}
}
return (rt_size_t) ptr - (rt_size_t) buffer;
}
void rt_hw_uart_init(void)
{
struct rt_uart_jz* uart;
/* get uart device */
uart = &uart_device;
/* device initialization */
uart->parent.type = RT_Device_Class_Char;
rt_memset(uart->rx_buffer, 0, sizeof(uart->rx_buffer));
uart->read_index = uart->save_index = 0;
#if defined(RT_USING_UART0)
uart->hw_base = UART0_BASE;
uart->irq = IRQ_UART0;
#elif defined(RT_USING_UART1)
uart->hw_base = UART1_BASE;
uart->irq = IRQ_UART1;
#elif defined(RT_USING_UART2)
uart->hw_base = UART2_BASE;
uart->irq = IRQ_UART2;
#elif defined(RT_USING_UART3)
uart->hw_base = UART3_BASE;
uart->irq = IRQ_UART3;
#endif
/* device interface */
uart->parent.init = rt_uart_init;
uart->parent.open = rt_uart_open;
uart->parent.close = rt_uart_close;
uart->parent.read = rt_uart_read;
uart->parent.write = rt_uart_write;
uart->parent.control = RT_NULL;
uart->parent.private = RT_NULL;
rt_device_register(&uart->parent,
"uart", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_INT_RX);
}
#endif /* end of UART */
/*@}*/