topic controlling UART ISR directly with (bypassing) MQX in Kinetis Microcontrollers

controlling UART ISR directly with (bypassing) MQX

MichaelDavid — Tue, 04 Oct 2011 22:16:52 GMT

I'm trying to configure a UART ISR.

I using MQX, but here I want to control the ISR directly.

The ISR doesn’t work when I start writing. (after sending one byte It doesn’t enter to the ISR )

Can You see if there is something missing in my configuration.

Michael David.

Here is my UART Configuration:

void Uart_InitUart(void)

{

uint_16 ubd,temp0,temp1,brfa;

uint_32 sysclk = BSP_SYSTEM_CLOCK, baud0 = 57600;

//UART configuration

SIM_SCGC4 |= (SIM_SCGC4_UART0_MASK);

PORTA_PCR14 = PORT_PCR_MUX(3); //TX 0

PORTA_PCR15 = PORT_PCR_MUX(3); //RX 0

UART_C2_REG(UART0_BASE_PTR) &= ~(UART_C2_TE_MASK | UART_C2_RE_MASK);

/* Configure the UART for 8-bit mode, no parity */

/* We need all default settings, so entire register is cleared */

UART_C1_REG(UART0_BASE_PTR) = 0;

/* Calculate baud settings */

ubd = (uint_16)((sysclk*1000)/(baud0 * 16));

/* Save off the current value of the UARTx_BDH except for the SBR */

temp0 = UART_BDH_REG(UART0_BASE_PTR) & ~(UART_BDH_SBR(0x1F));

UART_BDH_REG(UART0_BASE_PTR) = temp0 | UART_BDH_SBR(((ubd & 0x1F00) >> 8));

UART_BDL_REG(UART0_BASE_PTR) = (uint_8)(ubd & UART_BDL_SBR_MASK);

/* Determine if a fractional divider is needed to get closer to the baud rate */

brfa = (((sysclk*32000)/(baud0 * 16)) - (ubd * 32));

/* Save off the current value of the UARTx_C4 register except for the BRFA */

temp0 = UART_C4_REG(UART0_BASE_PTR) & ~(UART_C4_BRFA(0x1F));

UART_C4_REG(UART0_BASE_PTR) = temp0 | UART_C4_BRFA(brfa);

/* Enable receiver */

UART_C2_REG(UART0_BASE_PTR) |= ( UART_C2_RE_MASK | UART_C2_TE_MASK);

// configure ISR - UART 0 IRQ - 45

NVICICPR1 |= (1<<13); //45 MOD 32

NVICISER1 |= (1<<13);

NVICIP45 = 0x30; // priority 3. out of 15

Isr_InitIsr(INT_UART0_RX_TX, Uart_RxTx0_Isr);

}

Here is the Isr_InitIsr function:

void Isr_InitIsr(_mqx_uint isr, void (_CODE_PTR_ isr_func)(pointer))

{

MY_ISR_STRUCT_PTR isr_ptr;

isr_ptr = _mem_alloc_zero((_mem_size)sizeof(MY_ISR_STRUCT));

isr_ptr->TICK_COUNT = 0;

isr_ptr->OLD_ISR_DATA = _int_get_isr_data(isr);

isr_ptr->OLD_ISR = _int_get_isr(isr);

_int_install_isr(isr, isr_func, isr_ptr);

}

Re: controlling UART ISR directly with (bypassing) MQX

MichaelDavid — Thu, 29 Oct 2020 09:20:28 GMT

here is the solution:

void Uart_InitUart(void){ uint_32 ubd0,ubd1,ubd3,temp0,temp1,temp3,brfa; uint_32 sysclk = BSP_SYSTEM_CLOCK,busclk = BSP_BUS_CLOCK,  baud0 = 115200, baud13 = 57600; //UART configuration SIM_SCGC4 |= (SIM_SCGC4_UART0_MASK | SIM_SCGC4_UART1_MASK | SIM_SCGC4_UART3_MASK);  PORTA_PCR14 = PORT_PCR_MUX(3);      //TX 0  PORTA_PCR15 = PORT_PCR_MUX(3);      //RX 0  PORTC_PCR4  = PORT_PCR_MUX(3);      //TX 1  PORTC_PCR3  = PORT_PCR_MUX(3);      //RX 1  PORTB_PCR11 = PORT_PCR_MUX(3);      //TX 3  PORTB_PCR10 = PORT_PCR_MUX(3);      //RX 3  UART_C2_REG(UART0_BASE_PTR) &= ~(UART_C2_TE_MASK | UART_C2_RE_MASK); UART_C2_REG(UART1_BASE_PTR) &= ~(UART_C2_TE_MASK | UART_C2_RE_MASK); UART_C2_REG(UART3_BASE_PTR) &= ~(UART_C2_TE_MASK | UART_C2_RE_MASK); /* Configure the UART for 8-bit mode, no parity */ /* We need all default settings, so entire register is cleared */ UART_C1_REG(UART0_BASE_PTR) = 0; UART_C1_REG(UART1_BASE_PTR) = 0; UART_C1_REG(UART3_BASE_PTR) = 0; /* Calculate baud settings */ //ubd = (uint_32)((sysclk*1000)/(baud0 * 16)); ubd0 = (sysclk + 8 * baud0)/(16 * baud0); ubd1 = (sysclk + 8 * baud13)/(16 * baud13); ubd3 = (busclk + 8 * baud13)/(16 * baud13);   /* Save off the current value of the UARTx_BDH except for the SBR */ temp0 = UART_BDH_REG(UART0_BASE_PTR) & ~(UART_BDH_SBR(0x1F)); temp1 = UART_BDH_REG(UART1_BASE_PTR) & ~(UART_BDH_SBR(0x1F)); temp3 = UART_BDH_REG(UART3_BASE_PTR) & ~(UART_BDH_SBR(0x1F));  UART_BDH_REG(UART0_BASE_PTR) = temp0 |  UART_BDH_SBR(((ubd0 & 0x1F00) >> 8)); UART_BDH_REG(UART1_BASE_PTR) = temp1 |  UART_BDH_SBR(((ubd1 & 0x1F00) >> 8)); UART_BDH_REG(UART3_BASE_PTR) = temp3 |  UART_BDH_SBR(((ubd3 & 0x1F00) >> 8)); UART_BDL_REG(UART0_BASE_PTR) = (uint_8)(ubd0 & UART_BDL_SBR_MASK); UART_BDL_REG(UART1_BASE_PTR) = (uint_8)(ubd1 & UART_BDL_SBR_MASK); UART_BDL_REG(UART3_BASE_PTR) = (uint_8)(ubd3 & UART_BDL_SBR_MASK);  /* Determine if a fractional divider is needed to get closer to the baud rate */ //brfa = (((sysclk*32000)/(baud0 * 16)) - (ubd * 32));  /* Save off the current value of the UARTx_C4 register except for the BRFA */ //temp0 = UART_C4_REG(UART0_BASE_PTR) & ~(UART_C4_BRFA(0x1F)); //temp1 = UART_C4_REG(UART1_BASE_PTR) & ~(UART_C4_BRFA(0x1F));  //UART_C4_REG(UART0_BASE_PTR) = temp0 |  UART_C4_BRFA(brfa); //UART_C4_REG(UART0_BASE_PTR) = temp1 |  UART_C4_BRFA(brfa);  Isr_InitIsr(INT_UART0_RX_TX, Uart_RxTx0_Isr); Isr_InitIsr(INT_UART1_RX_TX, Uart_RxTx1_Isr); Isr_InitIsr(INT_UART3_RX_TX, Uart_RxTx3_Isr);  // configure ISR  - UART 0 IRQ - 45 NVICICPR1 |= (1<<13); //45 MOD 32 NVICISER1 |= (1<<13); NVICIP45 = 0x30;  // priority 3. out of 15  // configure ISR  - UART 1 IRQ - 47 NVICICPR1 |= (1<<15); //47 MOD 32 NVICISER1 |= (1<<15); NVICIP47 = 0x30;  // priority 3. out of 15  // configure ISR  - UART 3 IRQ - 51 NVICICPR1 |= (1<<19); //51 MOD 32 NVICISER1 |= (1<<19); NVICIP51 = 0x30;  // priority 3. out of 15   // clear ISR flags  temp0 = UART_S1_REG(UART0_BASE_PTR); temp1 = UART_S1_REG(UART1_BASE_PTR); temp3 = UART_S1_REG(UART3_BASE_PTR); /* Enable receiver */ UART_C2_REG(UART0_BASE_PTR) |= ( UART_C2_RE_MASK | UART_C2_TE_MASK |   UART_C2_RIE_MASK | UART_C2_TIE_MASK); UART_C2_REG(UART1_BASE_PTR) |= ( UART_C2_RE_MASK | UART_C2_TE_MASK |   UART_C2_RIE_MASK | UART_C2_TIE_MASK); UART_C2_REG(UART3_BASE_PTR) |= ( UART_C2_RE_MASK | UART_C2_TE_MASK |    UART_C2_RIE_MASK | UART_C2_TIE_MASK);  }

void Isr_InitIsr(_mqx_uint isr, void (_CODE_PTR_ isr_func)(pointer)){ MY_ISR_STRUCT_PTR  isr_ptr;  isr_ptr = _mem_alloc_zero((_mem_size)sizeof(MY_ISR_STRUCT));  isr_ptr->TICK_COUNT   = 0; isr_ptr->OLD_ISR_DATA = _int_get_isr_data(isr); isr_ptr->OLD_ISR      = _int_get_isr(isr);  _int_install_isr(isr, isr_func, isr_ptr);}

void Uart_RxTx0_Isr(pointer user_isr_ptr){ MY_ISR_STRUCT_PTR  isr_ptr; uint_16 temp; isr_ptr = (MY_ISR_STRUCT_PTR)user_isr_ptr; isr_ptr->TICK_COUNT++;  // receive routine temp = UART_S1_REG(UART0_BASE_PTR); if (temp & UART_S1_RDRF_MASK) {  if (m_rx0Len < UART_BUF)   rx0Buf[m_rx0Len++] = UART_D_REG(UART0_BASE_PTR); } // transmit routine else if (temp & UART_S1_TDRE_MASK) {  if ((m_tx0Sent < m_tx0Len) && (m_tx0Sent < UART_BUF))  {   UART_D_REG(UART0_BASE_PTR) = tx0Buf[m_tx0Sent++];  }  else  {   // stop transmission   UART_C2_REG(UART0_BASE_PTR) &= ~(UART_C2_TIE_MASK);  } }}

Re: controlling UART ISR directly with (bypassing) MQX

MichaelDavid — Fri, 25 Nov 2011 05:29:36 GMT

When Initializing I wrote :

NVICIP45 = 0x30; // priority 3. out of 15

this turn to be interfering with the MQX kernal , changing it to 10 , (0xA0) solved the issue.

Re: controlling UART ISR directly with (bypassing) MQX

crezyoz — Sun, 02 Sep 2012 23:07:33 GMT

I noticed in the isr you wrote above you are using a uint16 temp var to read the S1 register. Does this have any effect since the UART regs are all 8 bit?

thanks~