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serial: sam0: add samd20 support

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There are some minor differences between the UART om SAMD20 and SAMD21
that we need to take into account:

SYNCBUSY bit for the samd20 is located in the STATUS reg.

The samd20 does not have a SAMPR bit like the samd21.

Signed-off-by: Sean Nyekjaer <sean@nyekjaer.dk>
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
This commit is contained in:
Sean Nyekjaer 2018-01-22 18:58:11 +01:00 committed by Kumar Gala
parent 451fc36824
commit d9b105fff5
1 changed files with 13 additions and 1 deletions
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14
drivers/serial/uart_sam0.c
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@ -37,8 +37,17 @@ struct uart_sam0_dev_data {
static void wait_synchronization(SercomUsart *const usart)
{
#if defined(SERCOM_USART_SYNCBUSY_MASK)
/* SYNCBUSY is a register */
while ((usart->SYNCBUSY.reg & SERCOM_USART_SYNCBUSY_MASK) != 0) {
}
#elif defined(SERCOM_USART_STATUS_SYNCBUSY)
/* SYNCBUSY is a bit */
while ((usart->STATUS.reg & SERCOM_USART_STATUS_SYNCBUSY) != 0) {
}
#else
#error Unsupported device
#endif
}
static int uart_sam0_set_baudrate(SercomUsart *const usart, u32_t baudrate,
@ -84,8 +93,11 @@ static int uart_sam0_init(struct device *dev)
cfg->pads |
/* Internal clock */
SERCOM_USART_CTRLA_MODE_USART_INT_CLK
#if defined(SERCOM_USART_CTRLA_SAMPR)
/* 16x oversampling with arithmetic baud rate generation */
| SERCOM_USART_CTRLA_SAMPR(0) | SERCOM_USART_CTRLA_FORM(0) |
| SERCOM_USART_CTRLA_SAMPR(0)
#endif
| SERCOM_USART_CTRLA_FORM(0) |
SERCOM_USART_CTRLA_CPOL | SERCOM_USART_CTRLA_DORD;
wait_synchronization(usart);