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drivers: serial: rpi_pico: replaced high level API functions

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replaced high level API functions with register access

Signed-off-by: Andrei-Edward Popa <andrei_edward.popa@upb.ro>
This commit is contained in:
Andrei-Edward Popa 2022-02-03 20:07:59 +02:00 • committed by Anas Nashif
commit e11077d7a5
1 changed files with 13 additions and 3 deletions
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16
drivers/serial/uart_rpi_pico.c
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@ -33,20 +33,26 @@ struct uart_rpi_data {
static int uart_rpi_poll_in(const struct device *dev, unsigned char *c)
{
const struct uart_rpi_config *config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
if (!uart_is_readable(config->uart_dev)) {
if (uart_hw->fr & UART_UARTFR_RXFE_BITS) {
return -1;
}
*c = (unsigned char)uart_get_hw(config->uart_dev)->dr;
*c = (unsigned char)uart_hw->dr;
return 0;
}
static void uart_rpi_poll_out(const struct device *dev, unsigned char c)
{
const struct uart_rpi_config *config = dev->config;
uart_hw_t * const uart_hw = config->uart_regs;
uart_putc_raw(config->uart_dev, c);
while (uart_hw->fr & UART_UARTFR_TXFF_BITS) {
/* Wait */
}
uart_hw->dr = c;
}
static int uart_rpi_init(const struct device *dev)
@ -62,6 +68,10 @@ static int uart_rpi_init(const struct device *dev)
return ret;
}
/*
* uart_init() may be replaced by register based API once rpi-pico platform
* has a clock controller driver and a reset controller driver
*/
baudrate = uart_init(uart_inst, data->baudrate);
/* Check if baudrate adjustment returned by 'uart_init' function is a positive value */
if (baudrate <= 0) {