S32K144 EVB之UART
开发环境
IAR7.8 + S32K144-EVB
本次使用到的是UART1，可以使用OpenSDA的mini USB口直接接到电脑上即可看到串口信息：
使用到的端口引脚为：
UART_TX -> PTC6
UART_RX -> PTC7
step1:配置GPIO
//config clock source
PCC->PCCn[PCC_PORTC_INDEX] = 0x40000000;
PORTC->PCR[6] |= PORT_PCR_MUX(2); /* Port C6: MUX = ALT2,UART1 TX */
PORTC->PCR[7] |= PORT_PCR_MUX(2); /* Port C7: MUX = ALT2,UART1 RX */step2:初始化uart
void LPUART1_init(void)
{
//config clock source
PCC->PCCn[PCC_LPUART1_INDEX] &= ~PCC_PCCn_CGC_MASK;
PCC->PCCn[PCC_LPUART1_INDEX] |= PCC_PCCn_PCS(1) | PCC_PCCn_CGC_MASK;
//set baud rate:9600 8N1
LPUART1->BAUD = 0x0F000034;
LPUART1->CTRL = 0x000C0000;
//enable TIE and RIE irq
LPUART1->CTRL|= 0x00A00000;
}step3:配置中断及编写中断函数
FSL_NVIC->ICPR[1] = 1 << (LPUART1_RxTx_IRQn % 32); /* clr any pending IRQ*/
FSL_NVIC->ISER[1] = 1 << (LPUART1_RxTx_IRQn % 32); /* enable IRQ */
FSL_NVIC->IP[LPUART1_RxTx_IRQn] = 0xA; /* priority 10 of 0-15*/
void LPUART1_RxTx_IRQHandler(void)
{
unsigned char rev = 0;
//TDRE
if (LPUART1->STAT & 0x00800000) {
LPUART1->CTRL &=~0x00800000;
}
//TC
if (LPUART1->STAT & 0x00400000) {
LPUART1->CTRL &=~0x00400000;
}
//RDRF
if (LPUART1->STAT & 0x00200000) {
rev = LPUART1->DATA;
LED_light(rev % 8);
}
}本次只是做了一个验证UART基本功能的Demo，上电之后会uart会输出一个’>’，然后等待输入，输入%8即为LED灯的颜色，具体见”S32K144 EVB之GPIO”
完整版Code如下：
#include "S32K144.h"
#include "S32K144_features.h"
#define RED 15
#define GREEN 16
#define BLUE 0
#define BTN0 12
#define BTN1 13
#define BIT(n) (1 << (n))
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned long u32;
static void Clock_Config(void);
static void Gpio_Config(void);
static void LED_light(u8 color);
static void IRQ_Config(void);
static void RTC_init(void);
void LPUART1_init(void);
void LPUART1_transmit_char(char send);
static u8 color = 0;
int main(void)
{
u32 cnt;
cnt = 0;
Clock_Config();
Gpio_Config();
IRQ_Config();
RTC_init();
LPUART1_init(); /* Initialize LPUART @ 9600*/
LPUART1_transmit_char('>'); /* Transmit prompt character*/
while (1) {
cnt ++;
}
}
void PORTC_IRQHandler(void)
{
if (PORTC->ISFR & BIT(BTN0)) {
LED_light(color ++ % 8);
PORTC->ISFR |= BIT(BTN0);
} else if (PORTC->ISFR & BIT(BTN1)) {
LED_light(color -- % 8);
PORTC->ISFR |= BIT(BTN1);
} else {
/* do_nothing(); */
}
}
void RTC_Seconds_IRQHandler(void)
{
//LED_light(color ++ % 8);
}
void LPUART1_RxTx_IRQHandler(void)
{
unsigned char rev = 0;
//TDRE
if (LPUART1->STAT & 0x00800000) {
LPUART1->CTRL &=~0x00800000;
}
//TC
if (LPUART1->STAT & 0x00400000) {
LPUART1->CTRL &=~0x00400000;
}
//RDRF
if (LPUART1->STAT & 0x00200000) {
rev = LPUART1->DATA;
LED_light(rev % 8);
}
}
void SOSC_init_8MHz(void)
{
SCG->SOSCDIV=0x00000101; /* SOSCDIV1 & SOSCDIV2 =1: divide by 1 */
SCG->SOSCCFG=0x00000024;
/* Range=2: Medium freq (SOSC between 1MHz-8MHz)*/
/* HGO=0: Config xtal osc for low power */
/* EREFS=1: Input is external XTAL */
while(SCG->SOSCCSR & SCG_SOSCCSR_LK_MASK); /* Ensure SOSCCSR unlocked */
SCG->SOSCCSR=0x00000001;
/* LK=0: SOSCCSR can be written */
/* SOSCCMRE=0: OSC CLK monitor IRQ if enabled */
/* SOSCCM=0: OSC CLK monitor disabled */
/* SOSCERCLKEN=0: Sys OSC 3V ERCLK output clk disabled */
/* SOSCLPEN=0: Sys OSC disabled in VLP modes */
/* SOSCSTEN=0: Sys OSC disabled in Stop modes */
/* SOSCEN=1: Enable oscillator */
while(!(SCG->SOSCCSR & SCG_SOSCCSR_SOSCVLD_MASK)); /* Wait for sys OSC clk valid */
}
void SPLL_init_160MHz(void)
{
while(SCG->SPLLCSR & SCG_SPLLCSR_LK_MASK); /* Ensure SPLLCSR unlocked */
SCG->SPLLCSR = 0x00000000; /* SPLLEN=0: SPLL is disabled (default) */
SCG->SPLLDIV = 0x00000302; /* SPLLDIV1 divide by 2; SPLLDIV2 divide by 4 */
SCG->SPLLCFG = 0x00180000; /* PREDIV=0: Divide SOSC_CLK by 0+1=1 */
/* MULT=24: Multiply sys pll by 4+24=40 */
/* SPLL_CLK = 8MHz / 1 * 40 / 2 = 160 MHz */
while(SCG->SPLLCSR & SCG_SPLLCSR_LK_MASK); /* Ensure SPLLCSR unlocked */
SCG->SPLLCSR = 0x00000001;
/* LK=0: SPLLCSR can be written */
/* SPLLCMRE=0: SPLL CLK monitor IRQ if enabled */
/* SPLLCM=0: SPLL CLK monitor disabled */
/* SPLLSTEN=0: SPLL disabled in Stop modes */
/* SPLLEN=1: Enable SPLL */
while(!(SCG->SPLLCSR & SCG_SPLLCSR_SPLLVLD_MASK)); /* Wait for SPLL valid */
}
void NormalRUNmode_80MHz (void)
{
/* Change to normal RUN mode with 8MHz SOSC, 80 MHz PLL*/
SCG->RCCR=SCG_RCCR_SCS(6) | SCG_RCCR_DIVCORE(1) | SCG_RCCR_DIVBUS(1) | SCG_RCCR_DIVSLOW(2);
while (((SCG->CSR & SCG_CSR_SCS_MASK) >> SCG_CSR_SCS_SHIFT ) != 6) {}
/* Wait for sys clk src = SPLL */
}
static void Clock_Config(void)
{
SOSC_init_8MHz(); /* Initialize system oscillator for 8 MHz xtal */
SPLL_init_160MHz(); /* Initialize sysclk to 160 MHz with 8 MHz SOSC */
NormalRUNmode_80MHz(); /* Init clocks: 80 MHz sysclk & core, 40 MHz bus, 20 MHz flash */
}
/**
* PTD15-> RGB_RED
* PTD16-> RGB_GREEN
* PTD0 -> RGB_BLUE
* BTN0 -> PTC12
* BTN1 -> PTC13
*/
static void Gpio_Config(void)
{
//config clock source
PCC->PCCn[PCC_PORTD_INDEX] = 0x40000000;
PCC->PCCn[PCC_PORTC_INDEX] = 0x40000000;
/*
* ISF Interrupt Status Flag
* IRQC Interrupt Configuration
* LK Lock Register
* MUX Pin Mux Control
* DSE Drive Strength Enable
* PFE Passive Filter Enable
* PE Pull Enable
* PS Pull Select
*/
/*
* ISF 0
* IRQC 0000
* LK 0
* MUX 001
* DSE 0
* PFE 0
* PE 0
* PS 0
*/
PORTD->PCR[RED] = 0x00000100;
PORTD->PCR[GREEN] = 0x00000100;
PORTD->PCR[BLUE] = 0x00000100;
PTD->PDDR |= BIT(RED) | BIT(GREEN) | BIT(BLUE);
PTD->PDOR |= BIT(RED) | BIT(GREEN) | BIT(BLUE);
/*
* ISF 0
* IRQC 1001
* LK 0
* MUX 001
* DSE 0
* PFE 0
* PE 0
* PS 0
*/
PORTC->PCR[BTN0] = 0x00090100;
PORTC->PCR[BTN1] = 0x00090100;
PTC->PDDR &=~(BIT(BTN0) | BIT(BTN1));
/**
* UART_TX -> PTC6
* UART_RX -> PTC7
*/
PORTC->PCR[6] |= PORT_PCR_MUX(2); /* Port C6: MUX = ALT2,UART1 TX */
PORTC->PCR[7] |= PORT_PCR_MUX(2); /* Port C7: MUX = ALT2,UART1 RX */
}
/**
* TSR -> RTC Time Seconds Register
* TPR -> RTC Time Prescaler Register
* TAR -> RTC Time Alarm Register
* TCR -> RTC Time Compensation Register
* CR -> RTC Control Register
* SR -> RTC Status Register
* LR -> RTC Lock Register
* IER -> RTC Interrupt Enable Register
*/
static void RTC_init(void)
{
//config clock source
PCC->PCCn[PCC_RTC_INDEX] = 0x40000000;
//Init RTC
RTC->SR = 0x00000000;
RTC->IER = 0x00000000;
//RTC->TCR = 0x00000001;
/**
* TSR
*/
RTC->TSR = 0x00000001;
/**
* TPR
*/
//RTC->TPR = ;
/**
* TAR
*/
//RTC->TAR = ;
/**
* CIC Compensation Interval Counter
* TCV Time Compensation Value
* CIR Compensation Interval Register
* TCR Time Compensation Register
*/
//RTC->TCR = 0x00000000;
/**
* CPE Clock Pin Enable
* LPOS LPO Select
* CPS Clock Pin Select
* UM Update Mode
* SUP Supervisor Access
* SWR Software Reset
*/
RTC->CR = 0x00000004;
/**
* LRL Lock Register Lock
* SRL Status Register Lock
* CRL Control Register Lock
* TCL Time Compensation Lock
*/
//RTC->LR = 0x00000078;
/**
* TSIC Timer Seconds Interrupt Configuration
* TSIE Time Seconds Interrupt Enable
* TAIE Time Alarm Interrupt Enable
* TOIE Time Overflow Interrupt Enable
* TIIE Time Invalid Interrupt Enable
*/
RTC->IER = 0x00000010;
/**
* TCE Time Counter Enable
* TAF Time Alarm Flag
* TOF Time Overflow Flag
* TIF Time Invalid Flag
*/
RTC->SR = 0x00000010;
}
static void LED_light(u8 color)
{
PTD->PDOR |= BIT(RED) | BIT(GREEN) | BIT(BLUE);
if (color & 0x01)
PTD->PDOR &=~BIT(RED);
if (color & 0x02)
PTD->PDOR &=~BIT(GREEN);
if (color & 0x04)
PTD->PDOR &=~BIT(BLUE);
}
static void IRQ_Config(void)
{
FSL_NVIC->ICPR[1] = 1 << (PORTC_IRQn % 32); /* clr any pending IRQ*/
FSL_NVIC->ISER[1] = 1 << (PORTC_IRQn % 32); /* enable IRQ */
FSL_NVIC->IP[PORTC_IRQn] = 0xA; /* priority 10 of 0-15*/
FSL_NVIC->ICPR[1] = 1 << (RTC_Seconds_IRQn % 32); /* clr any pending IRQ*/
FSL_NVIC->ISER[1] = 1 << (RTC_Seconds_IRQn % 32); /* enable IRQ */
FSL_NVIC->IP[RTC_Seconds_IRQn] = 0xA; /* priority 10 of 0-15*/
FSL_NVIC->ICPR[1] = 1 << (LPUART1_RxTx_IRQn % 32); /* clr any pending IRQ*/
FSL_NVIC->ISER[1] = 1 << (LPUART1_RxTx_IRQn % 32); /* enable IRQ */
FSL_NVIC->IP[LPUART1_RxTx_IRQn] = 0xA; /* priority 10 of 0-15*/
}
void LPUART1_init(void)
{
//config clock source
PCC->PCCn[PCC_LPUART1_INDEX] &= ~PCC_PCCn_CGC_MASK;
PCC->PCCn[PCC_LPUART1_INDEX] |= PCC_PCCn_PCS(1) | PCC_PCCn_CGC_MASK;
//set baud rate:9600 8N1
LPUART1->BAUD = 0x0F000034;
LPUART1->CTRL = 0x000C0000;
//enable TIE and RIE irq
LPUART1->CTRL|= 0x00A00000;
}
void LPUART1_transmit_char(char send)
{
LPUART1->DATA=send;
//enable TIE irq
LPUART1->CTRL |= 0x00800000;
}