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Enable LPC8xx usart when configuring it

pull/1266/head
Alexander Beer 2015-07-27 11:45:47 +02:00
parent 9b9bab51e5
commit 37a478b88c
2 changed files with 23 additions and 3 deletions
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14
libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC81X/serial_api.c
View File

@ -196,8 +196,18 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
default:
break;
}
obj->uart->CFG = (data_bits << 2)
// First disable the the usart as described in documentation and then enable while updating CFG
// 24.6.1 USART Configuration register
// Remark: If software needs to change configuration values, the following sequence should
// be used: 1) Make sure the USART is not currently sending or receiving data. 2) Disable
// the USART by writing a 0 to the Enable bit (0 may be written to the entire register). 3)
// Write the new configuration value, with the ENABLE bit set to 1.
obj->uart->CFG &= ~(1 << 0);
obj->uart->CFG = (1 << 0) // this will enable the usart
| (data_bits << 2)
| (paritysel << 4)
| (stop_bits << 6);
}

12
libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC82X/serial_api.c
View File

@ -230,7 +230,17 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
break;
}
obj->uart->CFG = (data_bits << 2)
// First disable the the usart as described in documentation and then enable while updating CFG
// 24.6.1 USART Configuration register
// Remark: If software needs to change configuration values, the following sequence should
// be used: 1) Make sure the USART is not currently sending or receiving data. 2) Disable
// the USART by writing a 0 to the Enable bit (0 may be written to the entire register). 3)
// Write the new configuration value, with the ENABLE bit set to 1.
obj->uart->CFG &= ~(1 << 0);
obj->uart->CFG = (1 << 0) // this will enable the usart
| (data_bits << 2)
| (paritysel << 4)
| (stop_bits << 6);
}