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atsamd: Add a get_pclock_frequency() helper function 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-01-18 18:52:44 -05:00
parent 8f763d80b7
commit c5fc264a07
5 changed files with 13 additions and 7 deletions
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7
src/atsamd/clock.c
View File

@ -43,6 +43,13 @@ enable_pclock(uint32_t pclk_id, uint32_t pm_id)
(&PM->APBAMASK.reg)[pm_port] |= pm_bit;
}
// Return the frequency of the given peripheral clock
uint32_t
get_pclock_frequency(uint32_t pclk_id)
{
return FREQ_MAIN;
}
void
SystemInit(void)
{

5
src/atsamd/i2c.c
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@ -4,7 +4,6 @@
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_CLOCK_FREQ
#include "internal.h" // enable_pclock
#include "command.h" // shutdown
#include "gpio.h" // i2c_setup
@ -38,8 +37,8 @@ i2c_init(void)
| SERCOM_I2CM_STATUS_MEXTTOUT
| SERCOM_I2CM_CTRLA_MODE_I2C_MASTER);
si->CTRLA.reg = areg;
uint32_t baud = (CONFIG_CLOCK_FREQ / I2C_FREQ
- 10 - CONFIG_CLOCK_FREQ*TIME_RISE/1000000000) / 2;
uint32_t freq = get_pclock_frequency(SERCOM3_GCLK_ID_CORE);
uint32_t baud = (freq/I2C_FREQ - 10 - freq*TIME_RISE/1000000000) / 2;
si->BAUD.reg = baud;
si->CTRLA.reg = areg | SERCOM_I2CM_CTRLA_ENABLE;
while (si->SYNCBUSY.reg & SERCOM_I2CM_SYNCBUSY_ENABLE)

1
src/atsamd/internal.h
View File

@ -9,6 +9,7 @@
#define GPIO2BIT(PIN) (1<<((PIN) % 32))
void enable_pclock(uint32_t pclk_id, uint32_t pm_id);
uint32_t get_pclock_frequency(uint32_t pclk_id);
void gpio_peripheral(uint32_t gpio, char ptype, int32_t pull_up);
#endif // internal.h

4
src/atsamd/serial.c
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@ -4,7 +4,6 @@
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_SERIAL_BAUD
#include "board/serial_irq.h" // serial_rx_data
#include "internal.h" // enable_pclock
#include "samd21.h" // SERCOM0
@ -28,7 +27,8 @@ serial_init(void)
| SERCOM_USART_CTRLA_RXPO(3));
su->CTRLA.reg = areg;
su->CTRLB.reg = SERCOM_USART_CTRLB_TXEN | SERCOM_USART_CTRLB_RXEN;
uint32_t baud8 = CONFIG_CLOCK_FREQ / (2 * CONFIG_SERIAL_BAUD);
uint32_t freq = get_pclock_frequency(SERCOM0_GCLK_ID_CORE);
uint32_t baud8 = freq / (2 * CONFIG_SERIAL_BAUD);
su->BAUD.reg = (SERCOM_USART_BAUD_FRAC_BAUD(baud8 / 8)
| SERCOM_USART_BAUD_FRAC_FP(baud8 % 8));
NVIC_SetPriority(SERCOM0_IRQn, 0);

3
src/atsamd/spi.c
View File

@ -4,7 +4,6 @@
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_CLOCK_FREQ
#include "internal.h" // enable_pclock
#include "command.h" // shutdown
#include "gpio.h" // spi_setup
@ -47,7 +46,7 @@ spi_setup(uint32_t bus, uint8_t mode, uint32_t rate)
| SERCOM_SPI_CTRLA_DIPO(0)
| SERCOM_SPI_CTRLA_DOPO(1)
| SERCOM_SPI_CTRLA_ENABLE);
uint32_t baud = CONFIG_CLOCK_FREQ / (2 * rate) - 1;
uint32_t baud = get_pclock_frequency(SERCOM4_GCLK_ID_CORE) / (2 * rate) - 1;
spi_init(ctrla, baud);
return (struct spi_config){ .ctrla = ctrla, .baud = baud };
}