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This document outlines the architecture and implementation details of Universal Asynchronous Receiver/Transmitters (UARTs) in the ColdFire MCF5282 microcontroller, focusing on RS232 interfacing. It covers the UART register structures, configuration methods, and provides example assignments for setting up the interrupt controller and handling UART-related interrupts. This information is crucial for developers working on embedded systems where serial communication is needed, ensuring efficient and effective data transmission.
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ColdFire MCF5282Universal Asynchronous Receiver/Transmitters (UARTs)
/* ------------- will become array uart[3] 0200->02bc --------------- */ typedef struct { /* uart modules */ vubyte umr; /* 8bit uart mode register */ vubyte pack00[3]; /* 24bit reserved */ vubyte usr; /* 8bit read: status register */ /* write: clock-select register */ vubyte pack01[3]; /* 24bit reserved */ vubyte ucr; /* 8bit read: do not access */ /* write: command register */ vubyte pack02[3]; /* 24bit reserved */ vubyte udb; /* 8bit read: recieve buffer */ /* write: transmit buffer */ vubyte pack03[3]; /* 24bit reserved */ vubyte iacr; /* 8bit read: input port change register */ /* write: auxiliary control register */ vubyte pack04[3]; /* 24bit reserved */ vubyte ir; /* 8bit read: interupt status register */ /* write: interupt mask register */ vubyte pack05[3]; /* 24bit reserved */ vubyte dur; /* 8bit read: do not access */ /* write: divider upper register */ vubyte pack06[3]; /* 24bit reserved */ vubyte dlr; /* 8bit read: do not access */ /* write: divider lower register */ vubyte pack07[23];/* 24bit reserved */ vubyte uip; /* 8bit read: input port register */ /* write: do not access */ vubyte pack08[3]; /* 24bit reserved */ vubyte ops; /* 8bit read: do not access */ /* write: output port bit set command register */ vubyte pack09[3]; vubyte opr; /* 8bit read: do not access */ /* write: output port bit reset commmand register */ vubyte pack0a[3]; } uartstruct ; From Header File ..\mod5282\system\sim5282.h Example Assignment: sim.uart[1].ucr = 0x0200 /* reset receiver */
Universal Asynchronous Receiver/Transmitters (UARTs) Example Assignment: sim.uart[1].ucr = 0x0200 /* reset receiver */
Universal Asynchronous Receiver/Transmitters (UARTs) /* This function sets up the 5282 interrupt controller */ void SetIntc(int intc, /* Interrupt Controller Number */ long func, /* Address of Interrupt Service Routine */ int vector, /* Vector Table Number */ int level, /* Interupt Priority Level */ int prio /* Interrupt Priority Sub Level */ ); /* This macro implements the UART Interrupt Service Routine */ INTERRUPT(my_UART_func, /* Name of Interrupt Service Routine */ 0x2600 /* Mask - Enter Supervisor Mode, Set Interrupt Mask */ ) { /* You can add your ISR code here. - Do not call any RTOS function with pend or init in the function name - Do not call any functions that perform a system I/O read, write, prin }
Universal Asynchronous Receiver/Transmitters (UARTs) Interrupt Control Module
