ATMEL SAMC21 usart引脚切换

发表于 2015-9-17 16:49

本帖最后由 serenade753 于 2015-9-17 16:54 编辑

遇到一个问题

void configure_usart(void)                                                                                                                               //配置USART
{
      struct usart_config config_usart;
      usart_get_config_defaults(&config_usart);                                                                                     //配置USART默认值

      //! [setup_change_config]
      config_usart.baudrate = 9600;
      config_usart.mux_setting =USART_RX_1_TX_0_XCK_1;                                                                      //TX,RX引脚选择
      config_usart.pinmux_pad0 =0;                                                                                                             //端口使能/禁能
      config_usart.pinmux_pad1 =0;                                                                                                          //端口使能/禁能
      config_usart.pinmux_pad2 =PINMUX_UNUSED;                                                                                     //端口使能/禁能
      config_usart.pinmux_pad3 =PINMUX_UNUSED;                                                                                     //端口使能/禁能
      //! [setup_change_config]

      while (usart_init(&usart_instance,SERCOM3, &config_usart) != STATUS_OK){}                      //通信接口选择SERCOM3

      usart_enable(&usart_instance);                                                                                                             //USART使能
}

void configure_usarta(void)                                                                                                                               //配置USART
{
      struct usart_config config_usart;
      usart_get_config_defaults(&config_usart);                                                                                     //配置USART默认值

      //! [setup_change_config]
      config_usart.baudrate = 9600;
      config_usart.mux_setting =USART_RX_1_TX_2_XCK_3;                                                                      //TX,RX引脚选择
      config_usart.pinmux_pad0 =PINMUX_UNUSED;                                                                                     //端口使能/禁能
      config_usart.pinmux_pad1 =0;                                                                                                          //端口使能/禁能
      config_usart.pinmux_pad2 =0;                                                                                                             //端口使能/禁能
      config_usart.pinmux_pad3 =PINMUX_UNUSED;                                                                                     //端口使能/禁能
      //! [setup_change_config]

      while (usart_init(&usart_instance,SERCOM3, &config_usart) != STATUS_OK){}                      //通信接口选择SERCOM3

      usart_enable(&usart_instance);                                                                                                             //USART使能
}

初始化只配置了configure_usart()；
但是在后面的额代码中，需要配置configure_usarta()；也就是说两次配置USART的引脚不一样；
但是始终不能通过软件去切换，请大家帮忙看看，谢谢~~~:(

发表于 2015-9-17 21:53

楼主第一个ＵＳＡＲＴ好用么？？？
我用的是ＳＡＭＬ２１，

关于SERCOM3的宏定义在saml21e15a.h

中，

/* ========== PORT definition for SERCOM3 peripheral ========== */
#define PIN_PA16D_SERCOM3_PAD0          16L  /**< \brief SERCOM3 signal: PAD0 on PA16 mux D */
#define MUX_PA16D_SERCOM3_PAD0          3L
#define PINMUX_PA16D_SERCOM3_PAD0  ((PIN_PA16D_SERCOM3_PAD0 << 16) | MUX_PA16D_SERCOM3_PAD0)
#define PORT_PA16D_SERCOM3_PAD0 (1ul << 16)
#define PIN_PA22C_SERCOM3_PAD0          22L  /**< \brief SERCOM3 signal: PAD0 on PA22 mux C */
#define MUX_PA22C_SERCOM3_PAD0          2L
#define PINMUX_PA22C_SERCOM3_PAD0  ((PIN_PA22C_SERCOM3_PAD0 << 16) | MUX_PA22C_SERCOM3_PAD0)
#define PORT_PA22C_SERCOM3_PAD0 (1ul << 22)
#define PIN_PA27F_SERCOM3_PAD0          27L  /**< \brief SERCOM3 signal: PAD0 on PA27 mux F */
#define MUX_PA27F_SERCOM3_PAD0          5L
#define PINMUX_PA27F_SERCOM3_PAD0  ((PIN_PA27F_SERCOM3_PAD0 << 16) | MUX_PA27F_SERCOM3_PAD0)
#define PORT_PA27F_SERCOM3_PAD0 (1ul << 27)
#define PIN_PA17D_SERCOM3_PAD1          17L  /**< \brief SERCOM3 signal: PAD1 on PA17 mux D */
#define MUX_PA17D_SERCOM3_PAD1          3L
#define PINMUX_PA17D_SERCOM3_PAD1  ((PIN_PA17D_SERCOM3_PAD1 << 16) | MUX_PA17D_SERCOM3_PAD1)
#define PORT_PA17D_SERCOM3_PAD1 (1ul << 17)
#define PIN_PA23C_SERCOM3_PAD1          23L  /**< \brief SERCOM3 signal: PAD1 on PA23 mux C */
#define MUX_PA23C_SERCOM3_PAD1          2L
#define PINMUX_PA23C_SERCOM3_PAD1  ((PIN_PA23C_SERCOM3_PAD1 << 16) | MUX_PA23C_SERCOM3_PAD1)
#define PORT_PA23C_SERCOM3_PAD1 (1ul << 23)
#define PIN_PA18D_SERCOM3_PAD2          18L  /**< \brief SERCOM3 signal: PAD2 on PA18 mux D */
#define MUX_PA18D_SERCOM3_PAD2          3L
#define PINMUX_PA18D_SERCOM3_PAD2  ((PIN_PA18D_SERCOM3_PAD2 << 16) | MUX_PA18D_SERCOM3_PAD2)
#define PORT_PA18D_SERCOM3_PAD2 (1ul << 18)
#define PIN_PA24C_SERCOM3_PAD2          24L  /**< \brief SERCOM3 signal: PAD2 on PA24 mux C */
#define MUX_PA24C_SERCOM3_PAD2          2L
#define PINMUX_PA24C_SERCOM3_PAD2  ((PIN_PA24C_SERCOM3_PAD2 << 16) | MUX_PA24C_SERCOM3_PAD2)
#define PORT_PA24C_SERCOM3_PAD2 (1ul << 24)
#define PIN_PA19D_SERCOM3_PAD3          19L  /**< \brief SERCOM3 signal: PAD3 on PA19 mux D */
#define MUX_PA19D_SERCOM3_PAD3          3L
#define PINMUX_PA19D_SERCOM3_PAD3  ((PIN_PA19D_SERCOM3_PAD3 << 16) | MUX_PA19D_SERCOM3_PAD3)
#define PORT_PA19D_SERCOM3_PAD3 (1ul << 19)
#define PIN_PA25C_SERCOM3_PAD3          25L  /**< \brief SERCOM3 signal: PAD3 on PA25 mux C */
#define MUX_PA25C_SERCOM3_PAD3          2L
#define PINMUX_PA25C_SERCOM3_PAD3  ((PIN_PA25C_SERCOM3_PAD3 << 16) | MUX_PA25C_SERCOM3_PAD3)
#define PORT_PA25C_SERCOM3_PAD3 (1ul << 25)

我的意思是说，你要换管脚也得按这个宏定义来进行

发表于 2015-9-17 22:42

没有试过C21。

发表于 2015-9-18 09:03

ddllxxrr 发表于 2015-9-17 21:53
楼主第一个ＵＳＡＲＴ好用么？？？
我用的是ＳＡＭＬ２１，

后来代码改了

void configure_usart(void) //配置USART
{
struct usart_config config_usart;
usart_get_config_defaults(&config_usart); //配置USART默认值

//! [setup_change_config]
config_usart.baudrate = 115200;
config_usart.mux_setting =USART_RX_1_TX_0_XCK_1; //TX,RX引脚选择
config_usart.pinmux_pad0 =PINMUX_PA22C_SERCOM3_PAD0; //端口使能/禁能
config_usart.pinmux_pad1 =PINMUX_PA23C_SERCOM3_PAD1; //端口使能/禁能
config_usart.pinmux_pad2 =PINMUX_UNUSED; //端口使能/禁能
config_usart.pinmux_pad3 =PINMUX_UNUSED; //端口使能/禁能
//! [setup_change_config]

while (usart_init(&usart_instance,SERCOM3, &config_usart) != STATUS_OK){} //通信接口选择SERCOM3

usart_enable(&usart_instance); //USART使能
}

void configure_usarta(void) //配置USART
{
struct usart_config config_usart;
usart_get_config_defaults(&config_usart); //配置USART默认值

//! [setup_change_config]
config_usart.baudrate = 9600;
//config_usart.mux_setting =USART_RX_1_TX_2_XCK_3; //TX,RX引脚选择
config_usart.mux_setting =USART_RX_1_TX_0_XCK_1;
config_usart.pinmux_pad0 =PINMUX_PA22C_SERCOM3_PAD0; //端口使能/禁能
config_usart.pinmux_pad1 =PINMUX_PA23C_SERCOM3_PAD1; //端口使能/禁能
config_usart.pinmux_pad2 =PINMUX_UNUSED; //端口使能/禁能
config_usart.pinmux_pad3 =PINMUX_UNUSED; //端口使能/禁能
//! [setup_change_config]

while (usart_init(&usart_instance,SERCOM3, &config_usart) != STATUS_OK){} //通信接口选择SERCOM3

usart_enable(&usart_instance); //USART使能
}

初始化2次usart，两次无非是波特率不一样，但是只有第一次配置成功，第二次修改没有效果

发表于 2015-9-18 15:32

本帖最后由 ddllxxrr 于 2015-9-18 15:33 编辑

serenade753 发表于 2015-9-18 09:03
后来代码改了

void configure_usart(void) //配置USART

你在初始化第二个时，把串口先停了先
usart_disable(&usart_instance);然后再初始化，反正最后一行是使能串口，也就是说你在两个初始化之间加个，上边那句就好用了

发表于 2015-9-21 15:11

ddllxxrr 发表于 2015-9-18 15:32
你在初始化第二个时，把串口先停了先
usart_disable(&usart_instance);然后再初始化，反正最后一行是使能 ...

谢谢~~你说的非常正确~这个问题我已经搞定，现在和大家分享一下~
官方有两个例程，先说第一个
usart_basic_usel例程
int main(void)
{
system_init();
configure_usart();          //波特率9600

uint8_t string[] = "Hello World!\r\n";
usart_write_buffer_wait(&usart_instance, string, sizeof(string));

uint16_t temp;

usart_disable(&usart_instance);  //先disable
configure_usart1();                //再配置新参数，波特率115200

while (true) {

if (usart_read_wait(&usart_instance, &temp) == STATUS_OK) {
while (usart_write_wait(&usart_instance, temp) != STATUS_OK) {
}
}
}
}

第二个例程，callback函数
int main(void)
{
system_init();
delay_init();

configure_usart();
configure_usart_callbacks();

system_interrupt_enable_global();

uint8_t string[] = "Hello World!\r\n";
usart_write_buffer_wait(&usart_instance, string, sizeof(string));

usart_unregister_callback(&usart_instance, USART_CALLBACK_BUFFER_TRANSMITTED);
usart_unregister_callback(&usart_instance, USART_CALLBACK_BUFFER_RECEIVED);
usart_disable_callback(&usart_instance, USART_CALLBACK_BUFFER_TRANSMITTED);
usart_disable_callback(&usart_instance, USART_CALLBACK_BUFFER_RECEIVED);

usart_disable(&usart_instance);
configure_usarta();
configure_usart_callbacks();

delay_s(5);
usart_write_buffer_wait(&usart_instance, string, sizeof(string));
usart_write_buffer_wait(&usart_instance, string, sizeof(string));
usart_write_buffer_wait(&usart_instance, string, sizeof(string));

while (true) {

usart_read_buffer_job(&usart_instance,
(uint8_t *)rx_buffer, MAX_RX_BUFFER_LENGTH);
}
}

我一直纠结于callback函数的例程，没有想到将callback函数也disable掉，再config usart->enable usart->enable callback，大家可以作为参考，哈哈~

发表于 2015-9-21 15:17

serenade753 发表于 2015-9-21 15:11
谢谢~~你说的非常正确~这个问题我已经搞定，现在和大家分享一下~
官方有两个例程，先说第一个
usart_basi ...

楼主竟然专研到如此，真是佩服

发表于 2015-9-21 15:21

ddllxxrr 发表于 2015-9-21 15:17
楼主竟然专研到如此，真是佩服

第一次用ATMEL的ARM芯片，还要多向大家多请教啊，加油！

发表于 2015-10-11 13:46

楼主再专研下：
config_usart.mux_setting =USART_RX_1_TX_0_XCK_1;
这句是什么意思？
/** MUX setting RX_0_TX_0_XCK_1 */
USART_RX_0_TX_0_XCK_1 = (SERCOM_USART_CTRLA_RXPO(0)),
/** MUX setting RX_0_TX_2_XCK_3 */
USART_RX_0_TX_2_XCK_3 = (SERCOM_USART_CTRLA_RXPO(0) | SERCOM_USART_CTRLA_TXPO),
/** MUX setting RX_1_TX_0_XCK_1 */
USART_RX_1_TX_0_XCK_1 = (SERCOM_USART_CTRLA_RXPO(1)),
/** MUX setting RX_1_TX_2_XCK_3 */
USART_RX_1_TX_2_XCK_3 = (SERCOM_USART_CTRLA_RXPO(1) | SERCOM_USART_CTRLA_TXPO),
/** MUX setting RX_2_TX_0_XCK_1 */
USART_RX_2_TX_0_XCK_1 = (SERCOM_USART_CTRLA_RXPO(2)),
/** MUX setting RX_2_TX_2_XCK_3 */
USART_RX_2_TX_2_XCK_3 = (SERCOM_USART_CTRLA_RXPO(2) | SERCOM_USART_CTRLA_TXPO),
/** MUX setting RX_3_TX_0_XCK_1 */
USART_RX_3_TX_0_XCK_1 = (SERCOM_USART_CTRLA_RXPO(3)),
/** MUX setting RX_3_TX_2_XCK_3 */
USART_RX_3_TX_2_XCK_3 = (SERCOM_USART_CTRLA_RXPO(3) | SERCOM_USART_CTRLA_TXPO),
为何选USART_RX_1_TX_0_XCK_1，不选其它定义，其它定义是什么含义呢。

发表于 2015-11-16 17:38

mycent 发表于 2015-10-11 13:46
楼主再专研下：
config_usart.mux_setting =USART_RX_1_TX_0_XCK_1;
这句是什么意思？

你好，很久没来，才看到你的问题。

发表于 2015-11-16 17:49

mycent 发表于 2015-10-11 13:46
楼主再专研下：
config_usart.mux_setting =USART_RX_1_TX_0_XCK_1;
这句是什么意思？

SERCOM3/PAD[0]
SERCOM3/PAD[1]
SERCOM3/PAD[2]
SERCOM3/PAD[3]

config_usart.mux_setting =USART_RX_1_TX_0_XCK_1;//复用功能，RX_1为PAD[1],TX_0为PAD[0]

发表于 2020-11-19 14:33

请教楼主，SAMC21的Serial Number如何读取，datasheet里面说有一个128bit的序列号，但是没有例程怎么读出来。请教

[Atmel] ATMEL SAMC21 usart引脚切换

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