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Merge pull request #13041 from kaspar030/fe310_drain_uart_in_init

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cpu/fe310: some uart fixes
This commit is contained in:
Kaspar Schleiser 2020-01-07 14:22:24 +01:00 committed by GitHub
commit ad7d0d302e
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 18 additions and 1 deletions
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19
cpu/fe310/periph/uart.c
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@ -41,7 +41,9 @@ static inline void _uart_isr(uart_t dev)
/* Intr cleared automatically when data is read */
while ((data & UART_RXFIFO_EMPTY) != (uint32_t)UART_RXFIFO_EMPTY) {
isr_ctx[dev].rx_cb(isr_ctx[dev].arg, (uint8_t)(data & 0xff));
if (isr_ctx[dev].rx_cb) {
isr_ctx[dev].rx_cb(isr_ctx[dev].arg, (uint8_t)(data & 0xff));
}
data = _REG32(uart_config[dev].addr, UART_REG_RXFIFO);
}
}
@ -60,6 +62,16 @@ void uart_isr(int num)
}
}
static void _drain(uart_t dev)
{
uint32_t data = _REG32(uart_config[dev].addr, UART_REG_RXFIFO);
/* Intr cleared automatically when data is read */
while ((data & UART_RXFIFO_EMPTY) != (uint32_t)UART_RXFIFO_EMPTY) {
data = _REG32(uart_config[dev].addr, UART_REG_RXFIFO);
}
}
int uart_init(uart_t dev, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
{
uint32_t uartDiv;
@ -107,6 +119,11 @@ int uart_init(uart_t dev, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
set_external_isr_cb(uart_config[dev].isr_num, uart_isr);
PLIC_enable_interrupt(uart_config[dev].isr_num);
PLIC_set_priority(uart_config[dev].isr_num, UART_ISR_PRIO);
/* avoid trap by emptying RX FIFO */
_drain(dev);
/* enable RX interrupt */
_REG32(uart_config[dev].addr, UART_REG_IE) = UART_IP_RXWM;
/* Enable RX */