Baremetal using CMSIS

[smishra125]

I am a beginner in nxp and need to make a baremetal CMSIS project. I am using LPC55S28JBD100 controller. I don't know how to get started. PLease share some projects and links which help me to learn more on this.

[smishra125]

@danielholala @RaRo I got that and made the project. Also one thing, I want to toggle the LED without GPIO_PORTToggle(). I prepared the code but don't know how to clear the port. I tried to use gpio->CLR[1] = (1<<LED_RED); but it failed.

Following is the code snippet. 

void delay_ms(uint32_t count)
{
for(uint32_t i = 0 ; i < count*1000 ; i++);
}

int main(void) {
GPIO_Type *gpio = GPIO;
// TODO: insert code here
//
SYSCON_Type *syscon = SYSCON;

syscon->AHBCLKCTRL.AHBCLKCTRL0 |= (1<<15);//ENABLE GPIO1 CLOCK
syscon->AHBCLKCTRL.AHBCLKCTRL0 |= (1<<13);//ENABLE IOCON CLOCK

gpio->SET[1] = 0xff;//enable gpio 1 for reading/writing
gpio->DIR[1] = 0xff;// make gpio as output

// Force the counter to be placed into memory
volatile static int i = 0 ;
// Enter an infinite loop, just incrementing a counter
while(1) {
i++ ;
gpio->B[1][LED_RED] = (1<<LED_RED);
delay_ms(1000);
gpio->B[1][LED_GREEN] = (1<<LED_GREEN);
delay_ms(1000);
gpio->B[1][LED_BLUE] = (1<<LED_BLUE);
delay_ms(1000);
}
return 0 ;
}

[RaRo · Accepted solution]

Hello @smishra125,

I've already answered you in your other post: Trying to build LED blinking project in baremetal - NXP Community.

Regards, Raul.

[RaRo]

Hello @smishra125,

First, download an IDE compatible for creating your project, as MCUXpresso IDE

Second, in MCUXpresso IDE (as @danielholala points out) there is a bunch of examples you could try related with CMSIS, but first you need to download the SDK for your microcontroller; there are two ways:

1. Trough the MCUXpresso IDE

2. Trough the MCUXpresso SDK Builder

You can access the examples in MCUXpresso IDE as follows:

1. Click on Import SDK example(s)…

2. Select the micro or board related with the SDK you download it

3. Then search for CMSIS examples

Third, if you are searching for more information, I recommend you take a look to the following links: Overview CMSIS, and CMSIS: Cortex Microcontroller Software Interface Standard.

Regards, Raul

[danielholala]

Have you installed the SDK for your controller? If so, then import an SDK example and have a look at the source code. There are CMSIS driver examples for I2C, SPI and USART interfaces.