121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/*!
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\file gd32f4xx_fwdgt.c
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\brief FWDGT driver
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*/
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/*
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Copyright (C) 2016 GigaDevice
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2016-08-15, V1.0.0, firmware for GD32F4xx
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*/
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#include "gd32f4xx_fwdgt.h"
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/* write value to FWDGT_CTL_CMD bit field */
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#define CTL_CMD(regval) (BITS(0,15) & ((uint32_t)(regval) << 0))
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/* write value to FWDGT_RLD_RLD bit field */
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#define RLD_RLD(regval) (BITS(0,11) & ((uint32_t)(regval) << 0))
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/*!
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\brief disable write access to FWDGT_PSC and FWDGT_RLD
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\param[in] none
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\param[out] none
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\retval none
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*/
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void fwdgt_write_disable(void)
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{
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FWDGT_CTL = FWDGT_WRITEACCESS_DISABLE;
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}
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/*!
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\brief reload the counter of FWDGT
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\param[in] none
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\param[out] none
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\retval none
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*/
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void fwdgt_counter_reload(void)
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{
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FWDGT_CTL = FWDGT_KEY_RELOAD;
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}
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/*!
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\brief start the free watchdog timer counter
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\param[in] none
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\param[out] none
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\retval none
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*/
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void fwdgt_enable(void)
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{
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FWDGT_CTL = FWDGT_KEY_ENABLE;
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}
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/*!
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\brief configure counter reload value, and prescaler divider value
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\param[in] reload_value: specify reload value(0x0000 - 0x0FFF)
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\param[in] prescaler_div: FWDGT prescaler value
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\arg FWDGT_PSC_DIV4: FWDGT prescaler set to 4
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\arg FWDGT_PSC_DIV8: FWDGT prescaler set to 8
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\arg FWDGT_PSC_DIV16: FWDGT prescaler set to 16
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\arg FWDGT_PSC_DIV32: FWDGT prescaler set to 32
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\arg FWDGT_PSC_DIV64: FWDGT prescaler set to 64
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\arg FWDGT_PSC_DIV128: FWDGT prescaler set to 128
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\arg FWDGT_PSC_DIV256: FWDGT prescaler set to 256
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\param[out] none
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\retval ErrStatus: ERROR or SUCCESS
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*/
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ErrStatus fwdgt_config(uint16_t reload_value, uint8_t prescaler_div)
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{
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uint32_t timeout = FWDGT_PSC_TIMEOUT;
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uint32_t flag_status = RESET;
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/* enable write access to FWDGT_PSC,and FWDGT_RLD */
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FWDGT_CTL = FWDGT_WRITEACCESS_ENABLE;
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/* wait until the PUD flag to be reset */
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do{
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flag_status = FWDGT_STAT & FWDGT_STAT_PUD;
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}while((--timeout > 0U) && ((uint32_t)RESET != flag_status));
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if ((uint32_t)RESET != flag_status){
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return ERROR;
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}
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/* configure FWDGT */
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FWDGT_PSC = (uint32_t)prescaler_div;
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timeout = FWDGT_RLD_TIMEOUT;
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/* wait until the RUD flag to be reset */
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do{
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flag_status = FWDGT_STAT & FWDGT_STAT_RUD;
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}while((--timeout > 0U) && ((uint32_t)RESET != flag_status));
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if ((uint32_t)RESET != flag_status){
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return ERROR;
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}
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FWDGT_RLD = RLD_RLD(reload_value);
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/* reload the counter */
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FWDGT_CTL = FWDGT_KEY_RELOAD;
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return SUCCESS;
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}
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/*!
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\brief get flag state of FWDGT
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\param[in] flag: flag to get
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\arg FWDGT_STAT_PUD: a write operation to FWDGT_PSC register is on going
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\arg FWDGT_STAT_RUD: a write operation to FWDGT_RLD register is on going
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\param[out] none
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\retval FlagStatus: SET or RESET
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*/
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FlagStatus fwdgt_flag_get(uint16_t flag)
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{
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if(FWDGT_STAT & flag){
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return SET;
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}
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return RESET;
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}
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