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STM32: fix serial 7bit data format #5894

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Merged
merged 1 commit into from
Jan 23, 2018
Merged

STM32: fix serial 7bit data format #5894

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25 changes: 16 additions & 9 deletions targets/TARGET_STM/serial_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -474,27 +474,34 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
}

switch (data_bits) {
case 9:
MBED_ASSERT(parity == UART_PARITY_NONE);
obj_s->databits = UART_WORDLENGTH_9B;
case 7:
if (parity != UART_PARITY_NONE) {
obj_s->databits = UART_WORDLENGTH_8B;
} else {
#if defined UART_WORDLENGTH_7B
obj_s->databits = UART_WORDLENGTH_7B;
#else
error("7-bit data format without parity is not supported");
#endif
}
break;
default:
case 8:
if (parity != UART_PARITY_NONE) {
obj_s->databits = UART_WORDLENGTH_9B;
} else {
obj_s->databits = UART_WORDLENGTH_8B;
}
break;
#if defined UART_WORDLENGTH_7B
case 7:
case 9:
if (parity != UART_PARITY_NONE) {
obj_s->databits = UART_WORDLENGTH_8B;
error("Parity is not supported with 9-bit data format");
} else {
obj_s->databits = UART_WORDLENGTH_7B;
obj_s->databits = UART_WORDLENGTH_9B;
}
break;
#endif
default:
error("Only 7, 8 or 9-bit data formats are supported");
break;
}

if (stop_bits == 2) {
Expand Down