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Tue, 2019-11-19 15:42

＃1

ethsiplab

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最后一次露面：1个月2周前

Joined:2019-09-13 12:58

无法输出XTAL32K

Hi there,

I am trying to output XTAL32K on P0_14 to be able to connect it to external sensors. However, until now I was not successful in trying to do so. I have always set P0_14 to output mode and tried the following:

1. I have set P0_14 function to HW_GPIO_FUNC_CLOCK function and set GPIO_CLK_SEL_REG[FUNC_CLOCK_EN]
2. Alternatively, I have set GPIO_CLK_SEL_REG[FUNC_CLOCK_EN] while setting P0_14 function to HW_GPIO_FUNC_GPIO. At the same time I have set USBPAD_REG[USBPAD_EN] as instructed on p.294 of the datasheet (40.2.5 Special I/O Considerations)

I have also tried various combinations of the above approaches but could not get it to work.

Can you tell me what I am doing wrong?

上面的两种方法之间有什么区别？

On p.294 of the datasheet (40.2.5 Special I/O Considerations) it says, that P0_14 should not be used in sleep mode. Does this mean, that I cannot output XTAL32K in sleep mode?

谢谢你的帮助！

Device:

da1469x.

Wed, 2019-11-20 17:25

＃2

PM_DIALOG.

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最后一次露面：15 hours 53 min ago

Joined:2018-02-08 11:03

Hi Christian,

Let me check it and I will get back to you as soon as possible.

谢谢，PM_DIALOG.

Tue, 2019-12-03 15:57

（回复＃2）＃3

ethsiplab

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最后一次露面：1个月2周前

Joined:2019-09-13 12:58

Any news on this? By now I

Any news on this? By now I have found "5.4.3 Generating a Clock Output from DA1469x" in the DA1469x Application Hardware Design Guidelines which answers questions 2 and 3 from above. However, it is still not working. Here is how I configure things:

在system_init()中,我设置了sleep_mode pm_mode_idle to keep the processor in active state:

pm_sleep_mode_set（pm_mode_idle）;

Afterwards I configure the pins following the two methods (both of which do not work for me).

Method 1:

hw_gpio_set_pin_function(HW_GPIO_PORT_1, HW_GPIO_PIN_2, HW_GPIO_MODE_OUTPUT, HW_GPIO_FUNC_CLOCK); GPIO->GPIO_CLK_SEL_REG = GPIO->GPIO_CLK_SEL_REG | 0x08; //FUNC_CLOCK_EN

Method 2:

hw_gpio_set_pin_function(HW_GPIO_PORT_0, HW_GPIO_PIN_14, HW_GPIO_MODE_OUTPUT, HW_GPIO_FUNC_CLOCK) GPIO->GPIO_CLK_SEL_REG = GPIO->GPIO_CLK_SEL_REG | 0x10;//XTAL32K_OUTPUT_EN

Wed, 2019-12-04 15:22

＃4

PM_DIALOG.

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最后一次露面：15 hours 53 min ago

Joined:2018-02-08 11:03

Hi Christian,

My apologies for the delay. According to datasheet, P0_14 is used for the USB and specifically for Analog USB Full Speed D+ signal (USBp). Please check Table 2: DA14691/5 Pin Description from the datasheet. There are two options for exporting the XTAL32K to a GPIO.

将XTAL32K导出到P0_14。

Hardware modifications are needed in the DA1469x daughter board card. Suppose that you are using the DA14695 daughter board VFBGA86. Schematics can be found in the link below:

https://www.dialog-seminile.com/sites/default/files/da14695-db-vfbga86_vd-sch.pdf.

默认情况下，R7（0 OHM）和R8（0欧姆）电阻未填充。如果将XTAL32K导出到P0_14，则应填充两个电阻，但您不再具有USB功能。在HW修改后，请执行以下SW修改。出于演示目的，您应该在SDK的FreertOS_Retarget项目中修改prvsetuphardware（），如下：

#define AUTOMATIC_CLOCK_OUTPUT ( 1 ) static void prvSetupHardware( void ) { /* Init hardware */ pm_system_init(periph_init); uint32_t val = GPIO->GPIO_CLK_SEL_REG; #if !AUTOMATIC_CLOCK_OUTPUT REG_SET_FIELD(GPIO, GPIO_CLK_SEL_REG, FUNC_CLOCK_SEL, val, 0 ); REG_SET_FIELD(GPIO, GPIO_CLK_SEL_REG, FUNC_CLOCK_EN, val, 1 ); #else REG_SET_FIELD(GPIO, GPIO_CLK_SEL_REG, XTAL32K_OUTPUT_EN, val, 1 ); #endif GPIO->GPIO_CLK_SEL_REG = val; val = 0; val = GPREG->USBPAD_REG; REG_SET_FIELD(GPREG, USBPAD_REG, USBPAD_EN, val, 1); GPREG->USBPAD_REG = val; hw_gpio_set_pin_function(HW_GPIO_PORT_0, HW_GPIO_PIN_14, HW_GPIO_MODE_OUTPUT, HW_GPIO_FUNC_CLOCK); hw_gpio_pad_latch_enable(HW_GPIO_PORT_0, HW_GPIO_PIN_14); }

The are two different ways to set the registers. The code snippet is working with AUTOMATIC_CLOCK_OUTPUT set to 0 as well.

The default sleep mode is extended sleep mode, so you will see the XTAL32K exported to P0_14 for around 8sec. After 8sec the device will go to extended sleep and the configurations will be lost. If you would like to have the XTAL32K exported to P0_14 continuedly, disable the extended sleep mode(pm_mode_extended_sleep) to active mode(pm_mode_active).

将XTAL32K导出到另一个GPIO，例如P0_28

In this case, you should not need to do any hardware modifications. Just use the following code snippets in freertos_retarget project.

static void prvSetupHardware( void ) { /* Init hardware */ pm_system_init(periph_init); uint32_t val = GPIO->GPIO_CLK_SEL_REG; REG_SET_FIELD(GPIO, GPIO_CLK_SEL_REG, FUNC_CLOCK_SEL, val, 0 ); REG_SET_FIELD(GPIO, GPIO_CLK_SEL_REG, FUNC_CLOCK_EN, val, 1 ); GPIO->GPIO_CLK_SEL_REG = val; hw_gpio_set_pin_function(HW_GPIO_PORT_0, HW_GPIO_PIN_28, HW_GPIO_MODE_OUTPUT, HW_GPIO_FUNC_CLOCK); hw_gpio_pad_latch_enable(HW_GPIO_PORT_0, HW_GPIO_PIN_28); }

谢谢，PM_DIALOG.