size_t __read(int handle, unsigned char * buffer, size_t size)
{
size_t nChars = 0;
uint16_t ch = 0;
if (buffer == 0)
{
/* This means that we should flush internal buffers. Since we*/
/* don't we just return. (Remember, "handle" == -1 means that all*/
/* handles should be flushed.)*/
return 0;
}
/* This function only writes to "standard out" and "standard err",*/
/* for all other file handles it returns failure.*/
if ((handle != _LLIO_STDIN) && (handle != _LLIO_STDERR))
{
return _LLIO_ERROR;
}
/* read data.*/
while (size--)
{
while(UART_ReadByte(UART_DebugInstance, &ch));
*buffer++ = (char)ch & 0xFF;
++nChars;
}
return nChars;
}
static void
uart_irq_handler(int port)
{
struct hal_uart *u;
uint32_t status;
uint8_t data;
u = &uarts[port];
if (u->u_configured && u->u_open) {
status = UART_GetStatusFlags(u->u_base);
/* Check for RX data */
if (status & (kUART_RxDataRegFullFlag | kUART_RxOverrunFlag)) {
data = UART_ReadByte(u->u_base);
if (u->u_rx_stall || u->u_rx_func(u->u_func_arg, data) < 0) {
/*
* RX queue full.
*/
u->u_rx_stall = 1;
ur_queue(&u->ur_rx, data);
}
}
/* Check for TX complete */
if (kUART_TxDataRegEmptyFlag & UART_GetStatusFlags(u->u_base)) {
if (u->u_tx_started) {
u->u_tx_started = 0;
if (u->u_tx_done)
u->u_tx_done(u->u_func_arg);
}
}
}
}
/*
实验名称：WDOG窗口看门狗
实验平台：渡鸦开发板
板载芯片：MK60DN512ZVQ10
实验效果：开启看门狗的窗口模式，必须在规定的时间范围内喂狗，否则芯片复位
*/
int main(void)
{
DelayInit();
GPIO_QuickInit(HW_GPIOE, 6, kGPIO_Mode_OPP); /* LED */
UART_QuickInit(UART0_RX_PD06_TX_PD07, 115200);
/* 初始化看门狗 */
WDOG_InitTypeDef WDOG_InitStruct1 = {0};
WDOG_InitStruct1.mode = kWDOG_Mode_Window; //设置看门狗为窗口模式
WDOG_InitStruct1.windowInMs = 1000; /* 开窗时间 设置为窗体模式后 喂狗必须在 看门狗开始计时后 1000 - 2000 MS内完成 多了少了都复位 比普通看门狗严格*/
WDOG_InitStruct1.timeOutInMs = 2000; /* 时限 2000MS : 2000MS 内没有喂狗则复位 */
WDOG_Init(&WDOG_InitStruct1);
printf("\r\nSYSTEM RESET!!!!!!!%d\r\n", WDOG_GetResetCounter());
printf("press any character to feed dog feed, must be in windows time\r\n");
static uint32_t i;
uint16_t ch;
while(1)
{
if(UART_ReadByte(HW_UART0, &ch) == 0)
{
printf("wdog feed succ!\r\n");
WDOG_Refresh(); //喂狗
i = 0;
}
printf("cnt:i:%d\r", i++);
DelayMs(100);
GPIO_ToggleBit(HW_GPIOE, 6);
}
}
int serial_getc(serial_t *obj)
{
while (!serial_readable(obj));
uint8_t data;
data = UART_ReadByte(uart_addrs[obj->index]);
return data;
}
static int uart_mcux_poll_in(struct device *dev, unsigned char *c)
{
const struct uart_mcux_config *config = dev->config->config_info;
u32_t flags = UART_GetStatusFlags(config->base);
int ret = -1;
if (flags & kUART_RxDataRegFullFlag) {
*c = UART_ReadByte(config->base);
ret = 0;
}
return ret;
}
static int uart_mcux_fifo_read(struct device *dev, u8_t *rx_data,
const int len)
{
const struct uart_mcux_config *config = dev->config->config_info;
u8_t num_rx = 0;
while ((len - num_rx > 0) &&
(UART_GetStatusFlags(config->base) & kUART_RxDataRegFullFlag)) {
rx_data[num_rx++] = UART_ReadByte(config->base);
}
return num_rx;
}
void DEMO_UART_IRQHandler(void)
{
uint8_t data;
/* If new data arrived. */
if ((kUART_RxDataRegFullFlag | kUART_RxOverrunFlag) & UART_GetStatusFlags(DEMO_UART))
{
data = UART_ReadByte(DEMO_UART);
/* If ring buffer is not full, add data to ring buffer. */
if (((rxIndex + 1) % DEMO_RING_BUFFER_SIZE) != txIndex)
{
demoRingBuffer[rxIndex] = data;
rxIndex++;
rxIndex %= DEMO_RING_BUFFER_SIZE;
}
}
}
int fgetc(FILE *f)
{
uint16_t ch;
while(UART_ReadByte(UART_DebugInstance, &ch));
return (ch & 0xFF);
}