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UART: Fix maybe-uninitialized diagnostic

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The following error occurs when building with gcc 5.4.1 (debian stretch):

common-hal/busio/UART.c:104:83: error: 'sercom_index' may be used uninitialized in this function [-Werror=maybe-uninitialized]
                   sercom_insts[rx->sercom[j].index]->USART.CTRLA.bit.ENABLE == 0) ||

It may be related to the addition of rx-only UARTs; gcc is unable
to infer the intended relationship between have_tx and sercom_index
being set (I am still not entirely confident of it myself)
This commit is contained in:
Jeff Epler 2018-03-19 20:40:04 -05:00
parent bf42611738
commit dddfad6594
1 changed files with 1 additions and 1 deletions
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2
ports/atmel-samd/common-hal/busio/UART.c
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@ -56,7 +56,7 @@ void common_hal_busio_uart_construct(busio_uart_obj_t *self,
uint8_t bits, uart_parity_t parity, uint8_t stop, uint32_t timeout,
uint8_t receiver_buffer_size) {
Sercom* sercom = NULL;
uint8_t sercom_index;
uint8_t sercom_index = 255; // Unset index
uint32_t rx_pinmux = 0;
uint8_t rx_pad = 255; // Unset pad
uint32_t tx_pinmux = 0;