FAST static void rx_isr(void *param) {
/* TODO(alashkin): add errors checking */
unsigned int peri_reg = READ_PERI_REG(UART_INTR_STATUS(UART_MAIN));
static volatile int tail = 0;
if ((peri_reg & UART_RXBUF_FULL) != 0 || (peri_reg & UART_RX_NEW) != 0) {
int char_count, i;
CLEAR_PERI_REG_MASK(UART_CTRL_INTR(UART_MAIN),
UART_RXBUF_FULL | UART_RX_NEW);
WRITE_PERI_REG(UART_CLEAR_INTR(UART_MAIN), UART_RXBUF_FULL | UART_RX_NEW);
char_count = READ_PERI_REG(UART_DATA_STATUS(UART_MAIN)) & 0x000000FF;
/* TODO(mkm): handle overrun */
for (i = 0; i < char_count; i++, tail = (tail + 1) % RX_BUFFER_SIZE) {
rx_buf[tail] = READ_PERI_REG(UART_BUF(UART_MAIN)) & 0xFF;
if (rx_buf[tail] == UART_SIGINT_CHAR && uart_interrupt_cb) {
/* swallow the intr byte */
tail = (tail - 1) % RX_BUFFER_SIZE;
uart_interrupt_cb(UART_SIGINT_CHAR);
}
}
WRITE_PERI_REG(UART_CLEAR_INTR(UART_MAIN), UART_RXBUF_FULL | UART_RX_NEW);
SET_PERI_REG_MASK(UART_CTRL_INTR(UART_MAIN), UART_RXBUF_FULL | UART_RX_NEW);
#ifndef RTOS_SDK
system_os_post(TASK_PRIORITY, 0, tail);
#else
rtos_dispatch_char_handler(tail);
#endif
}
}
static void uart_tx_char(unsigned uartno, char ch) {
while (1) {
uint32 fifo_cnt =
(READ_PERI_REG(UART_DATA_STATUS(uartno)) & 0x00FF0000) >> 16;
if (fifo_cnt < 126) {
break;
}
}
WRITE_PERI_REG(UART_BUF(uartno), ch);
}
int gdb_read_uart_buf(char *buf) {
unsigned int peri_reg = READ_PERI_REG(UART_INTR_STATUS(UART_MAIN));
if ((peri_reg & UART_RXBUF_FULL) != 0 || (peri_reg & UART_RX_NEW) != 0) {
int char_count, i;
CLEAR_PERI_REG_MASK(UART_CTRL_INTR(UART_MAIN),
UART_RXBUF_FULL | UART_RX_NEW);
WRITE_PERI_REG(UART_CLEAR_INTR(UART_MAIN), UART_RXBUF_FULL | UART_RX_NEW);
char_count = READ_PERI_REG(UART_DATA_STATUS(UART_MAIN)) & 0x000000FF;
for (i = 0; i < char_count; i++) {
buf[i] = READ_PERI_REG(UART_BUF(UART_MAIN)) & 0xFF;
}
WRITE_PERI_REG(UART_CLEAR_INTR(UART_MAIN), UART_RXBUF_FULL | UART_RX_NEW);
SET_PERI_REG_MASK(UART_CTRL_INTR(UART_MAIN), UART_RXBUF_FULL | UART_RX_NEW);
return char_count;
}
return 0;
}
void uart_tx_char(unsigned uartno, char ch) {
while (tx_fifo_len(uartno) > 126) {
}
WRITE_PERI_REG(UART_BUF(uartno), ch);
}
