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cpu/fe310: add unified rtt configuration

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This commit is contained in:
Francisco Molina 2020-04-17 10:12:26 +02:00
parent 2fb7d84ae5
commit 442b11d0ee
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GPG Key ID: 3E94EAC3DBDEEDA8
4 changed files with 31 additions and 57 deletions
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11
boards/hifive1/include/periph_conf.h
View File

@ -168,17 +168,6 @@ static const spi_conf_t spi_config[] = {
#define SPI_NUMOF ARRAY_SIZE(spi_config)
/** @} */
/**
* @name RTT/RTC configuration
*
* @{
*/
#define RTT_FREQUENCY (1) /* in Hz */
#define RTT_MAX_VALUE (0xFFFFFFFF)
#define RTT_INTR_PRIORITY (2)
/** @} */
/**
* @name PWM configuration
*

11
boards/hifive1b/include/periph_conf.h
View File

@ -169,17 +169,6 @@ static const spi_conf_t spi_config[] = {
#define SPI_NUMOF ARRAY_SIZE(spi_config)
/** @} */
/**
* @name RTT/RTC configuration
*
* @{
*/
#define RTT_FREQUENCY (1) /* in Hz */
#define RTT_MAX_VALUE (0xFFFFFFFF)
#define RTT_INTR_PRIORITY (2)
/** @} */
/**
* @name PWM configuration
*

19
cpu/fe310/include/periph_cpu.h
View File

@ -160,6 +160,25 @@ typedef struct {
*/
#define WDT_HAS_STOP (1)
/**
* @name RTT/RTC configuration
*
* @{
*/
#define RTT_INTR_PRIORITY (2)
#define RTT_MAX_VALUE (0xffffffff)
#define RTT_CLOCK_FREQUENCY (32768U) /* in Hz */
#define RTT_MAX_FREQUENCY (RTT_CLOCK_FREQUENCY) /* in Hz */
#define RTT_MIN_FREQUENCY (1U) /* in Hz */
#ifndef RTT_FREQUENCY
#define RTT_FREQUENCY (RTT_MAX_FREQUENCY) /* in Hz */
#endif
/** @} */
#ifdef __cplusplus
}
#endif

47
cpu/fe310/periph/rtt.c
View File

@ -37,41 +37,12 @@
#include "debug.h"
/* Convert RTT freq to pre-scaler value */
#if (RTT_FREQUENCY == 32768)
#define RTT_SCALE (0)
#elif (RTT_FREQUENCY == 16384)
#define RTT_SCALE (1)
#elif (RTT_FREQUENCY == 8192)
#define RTT_SCALE (2)
#elif (RTT_FREQUENCY == 4096)
#define RTT_SCALE (3)
#elif (RTT_FREQUENCY == 2048)
#define RTT_SCALE (4)
#elif (RTT_FREQUENCY == 1024)
#define RTT_SCALE (5)
#elif (RTT_FREQUENCY == 512)
#define RTT_SCALE (6)
#elif (RTT_FREQUENCY == 256)
#define RTT_SCALE (7)
#elif (RTT_FREQUENCY == 128)
#define RTT_SCALE (8)
#elif (RTT_FREQUENCY == 64)
#define RTT_SCALE (9)
#elif (RTT_FREQUENCY == 32)
#define RTT_SCALE (10)
#elif (RTT_FREQUENCY == 16)
#define RTT_SCALE (11)
#elif (RTT_FREQUENCY == 8)
#define RTT_SCALE (12)
#elif (RTT_FREQUENCY == 4)
#define RTT_SCALE (13)
#elif (RTT_FREQUENCY == 2)
#define RTT_SCALE (14)
#elif (RTT_FREQUENCY == 1)
#define RTT_SCALE (15)
#else
#ifdef RTT_FREQUENCY
#if ((RTT_CLOCK_FREQUENCY % RTT_FREQUENCY) != 0)
#error "Invalid RTT_FREQUENCY: Must be power of 2"
#endif
#endif
#define RTT_SCALE __builtin_ctz(RTT_CLOCK_FREQUENCY / RTT_FREQUENCY)
typedef struct {
uint32_t alarm_val; /**< cached alarm val */
@ -161,8 +132,14 @@ void rtt_set_counter(uint32_t counter)
* Must program HI/LO regs
* Write scaled counter reg value
*/
AON_REG(AON_RTCLO) = counter << RTT_SCALE;
AON_REG(AON_RTCHI) = counter >> (32 - RTT_SCALE);
/* Use ifdef to avoid out of bound shift when RTT_SCALE == 0 */
#if RTT_CLOCK_FREQUENCY == RTT_FREQUENCY
AON_REG(AON_RTCLO) = counter;
AON_REG(AON_RTCHI) = 0;
#else
AON_REG(AON_RTCLO) = counter << RTT_SCALE;
AON_REG(AON_RTCHI) = counter >> (32 - RTT_SCALE);
#endif
}
void rtt_set_alarm(uint32_t alarm, rtt_cb_t cb, void *arg)