DSP多通道缓冲串口介绍

ID:211543 · 发表于 2017-6-15 16:05

DSP多通道缓冲串口可以支持多种通信方式，E1，SPI ,I2C等，可以与声卡芯片，AD芯片等通信。

一、接收的配置流程
1. Global behavior:
设置管脚和工作模式
Set the receiver pins to operate as McBSP pins
Enable/disable the digital loopback mode 回环模式
Enable/disable the clock stop mode 时钟停止模式
Enable/disable the receive multichannel selection mode 多通道
2. Data behavior:
Choose one or two phases for the receive frame 接受帧单段还是双段
Set the receive word length(s) 接收字长
Set the receive frame length
Enable/disable the receive frame-sync ignore function
Set the receive companding mode
Set the receive data delay
Set the receive sign-extension and justification mode 数据符号扩展和校验
Set the receive interrupt mode
3. Frame-sync behavior:
Set the receive frame-sync mode
Set the receive frame-sync polarity
Set the SRG frame-sync period and pulse width
4. Clock behavior:
Set the receive clock mode
Set the receive clock polarity
Set the SRG clock divide-down value
Set the SRG clock synchronization mode
Set the SRG clock mode [choose an input clock]
Set the SRG input clock polarity
二、寄存器配置
接收时需要配置的寄存器： SPCR1, SPCR2, PCR, RCR1, RCR2SRGR1, SRGR2 ,其他的可以设为default
下面是一个我的调试配置参数，所有时钟和帧同步都由外部提供
/* create a MCBSP config structure for recevie only mode, ignore the send configrue */
/* 外部提供所有时钟
* 单帧
* 每帧8bit
* CLK 2.048Mhz
* FS 8K
* 数据 1Bit延迟
*/
// this configuration OK
static MCBSP_Config MCBSP_READONLY_Config_test= {
MCBSP_SPCR1_RMK(
MCBSP_SPCR1_DLB_OFF, //DLB = 0 Digital loopbakc mode diable
MCBSP_SPCR1_RJUST_RZF, // RJUST = 0 Right justify the data and zero fill MSBs
MCBSP_SPCR1_CLKSTP_DISABLE, //CLKSTP = 0 Clock stop mode disable
MCBSP_SPCR1_DXENA_OFF, //DXENA = 0 DX delay enabler off
MCBSP_SPCR1_ABIS_DISABLE, //reserbed always write 0
MCBSP_SPCR1_RINTM_RRDY, //RINTM = 00 when the RRDY bit change form 0 to 1,Int mode
MCBSP_SPCR1_RSYNCERR_NO, // RSYNCERR = 0 receibe frame-sync error bit, no error
MCBSP_SPCR1_RRST_DISABLE //RRST = 0 reset the receiver
//注意:: 开始一定要设置为 disable 否则不能设置它的寄存器，全部为默认值
//导致不能正常接收，在程序调用C库函数 mcbspstart 时会在设为1 McBSP 便退出reset状态开始工作
),
MCBSP_SPCR2_RMK(
MCBSP_SPCR2_FREE_NO, //FREE = 0
MCBSP_SPCR2_SOFT_NO, //SOFT = 0
MCBSP_SPCR2_FRST_RESET, //FRST = 0 SPG reset
MCBSP_SPCR2_GRST_RESET, // GRST = 0 SPG reset
MCBSP_SPCR2_XINTM_XRDY, //XINTM = 0 transmit interrupt mode, XRDY bit change form 0 to 1
MCBSP_SPCR2_XSYNCERR_NO, //XSYNCER = 0 transmit frame-sync error bit, no error
MCBSP_SPCR2_XRST_DISABLE // XRST = 0, reset the transmitter
//注意:: 开始一定要设置为 disable 否则不能设置它的寄存器，全部为默认值
//导致不能正常发送，在程序调用C库函数 mcbspstart 时会在设为1 McBSP 便退出reset状态开始工作
),
MCBSP_RCR2_RMK(
MCBSP_RCR2_RPHASE_SINGLE, //RPHASE = 0 single-phase frame
MCBSP_RCR2_RFRLEN2_OF(0), //RFRLEN2 = 0
MCBSP_RCR2_RWDLEN2_8BIT, //RWDLEN2 = 0
MCBSP_RCR2_RCOMPAND_MSB, //RCOMPAND = 0 receibe companding mode, 0:no companding, MSB received first
MCBSP_RCR2_RFIG_NO, //RFIG = 1 frame-sync ignore bit ,1: ignore
MCBSP_RCR2_RDATDLY_1BIT //RDATDLY = 01 receive 1-bit data delay
),
MCBSP_XCR1_DEFAULT, //
MCBSP_XCR2_DEFAULT, //
MCBSP_SRGR1_RMK(
MCBSP_SRGR1_FWID_OF(0), //FWID = 0
MCBSP_SRGR1_CLKGDV_OF(0) //CLKGDV = 0
),
MCBSP_SRGR2_RMK(
MCBSP_SRGR2_GSYNC_FREE, // GSYNC = 0 5502 always write 0
MCBSP_SRGR2_CLKSP_RISING, //CLKSP = 0 5502 don't have the CLKS pin set 0 always rsing edge igern the CLKRP and CLKXP
MCBSP_SRGR2_CLKSM_CLKS, //CLKSM = 0 work with the CLKME bit inPCR
/* SCLKME CLKSM Sample Rate Generator
0 0 Signal on CLKS pin 注意5501没有CLKS pin
1 0 Signal on CLKR pin
0 1 McBSP internal input clock
（low外设的时钟--SYSCLK3）
1 1 Signal on CLKX pin
/*
MCBSP_SRGR2_FPER_OF(0) // FPER = 0
),
MCBSP_MCR1_DEFAULT,
MCBSP_MCR2_DEFAULT,
MCBSP_PCR_RMK(
MCBSP_PCR_XIOEN_SP, //XIOEN = 0
MCBSP_PCR_RIOEN_SP, //RIOEN = 0
MCBSP_PCR_FSXM_EXTERNAL, //FSXM = 0
MCBSP_PCR_FSRM_EXTERNAL, //FSRM = 0
MCBSP_PCR_CLKXM_INPUT, //CLKXM = 0
MCBSP_PCR_CLKRM_INPUT, //CLKRM = 0
MCBSP_PCR_SCLKME_BCLK, //SCLKME = 1
MCBSP_PCR_DXSTAT_0, //DXSTAT = 0 , used noly the RIOEN bit = 1
MCBSP_PCR_FSXP_ACTIVEHIGH, //FSXP = 0
MCBSP_PCR_FSRP_ACTIVEHIGH, // FSRP = 0
MCBSP_PCR_CLKXP_RISING, //CLKXP = 0
MCBSP_PCR_CLKRP_FALLING //CLKRP = 0
),
MCBSP_RCERA_DEFAULT,
MCBSP_RCERB_DEFAULT,
MCBSP_RCERC_DEFAULT,
MCBSP_RCERD_DEFAULT,
MCBSP_RCERE_DEFAULT,
MCBSP_RCERF_DEFAULT,
MCBSP_RCERG_DEFAULT,
MCBSP_RCERH_DEFAULT,
MCBSP_XCERA_DEFAULT,
MCBSP_XCERB_DEFAULT,
MCBSP_XCERC_DEFAULT,
MCBSP_XCERD_DEFAULT,
MCBSP_XCERE_DEFAULT,
MCBSP_XCERF_DEFAULT,
MCBSP_XCERG_DEFAULT,
MCBSP_XCERH_DEFAULT
};
注意的几点：
1. 在configure是 RRST 和 XRST 一定要设置为Disable，才可以正确的配置他的各个寄存器
2. 5502 不支持 CLKG的同步 SRGR2中的 GSYNC bit 始终写为 0
使用时如下步骤：
IRQ_globalDisable();
hMcbsp = MCBSP_open(MCBSP_PORT1, MCBSP_OPEN_RESET);
rcvEventID = MCBSP_getRcvEventId(hMcbsp);
IRQ_setVecs((Uint32)(&VECSTART));
IRQ_clear(rcvEventID);
IRQ_plug(rcvEventID, &readISR);
MCBSP_config(hMcbsp, &MCBSP_READONLY_Config_ _test);
IRQ_enable(rcvEventID);
/* Start Sample Rate Generator and Frame Sync */
MCBSP_start(hMcbsp,MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC,0x300); //如果需要
/* Enable MCBSP transmit and receive */
MCBSP_start(hMcbsp, MCBSP_RCV_START , 0);
IRQ_globalEnable();
三、测试例程
下面是我的一个测试程序，可以正确接受数据:
/*
*/
/*
*---------mcbsp_test.c---------
* McBSP receive and send example
*/
#include <stdio.h>
#include <csl.h>
#include <csl_mcbsp.h>
#include <csl_irq.h>
//---------Global constants---------
#define SIZE 1024
//---------Global data definition---------
//Handle for McBSP
static volatile MCBSP_Handle hMcbsp;
//Buffers to store data
static volatile Uint16 writeBuff[SIZE], readBuff[SIZE];
Uint16 rcvEventID;
Uint16 cnt=0;
/* create a MCBSP config structure for recevie only mode, ignore the send configrue */
/* 外部提供所有时钟
* 单帧
* 每帧8bit
* CLK 2.048Mhz
* FS 8K
* 数据 1Bit延迟
*/
// this configuration OK
static MCBSP_Config MCBSP_READONLY_Config_test= {
MCBSP_SPCR1_RMK(
MCBSP_SPCR1_DLB_OFF, //DLB = 0 Digital loopbakc mode diable
MCBSP_SPCR1_RJUST_RZF, // RJUST = 0 Right justify the data and zero fill MSBs
MCBSP_SPCR1_CLKSTP_DISABLE, //CLKSTP = 0 Clock stop mode disable
MCBSP_SPCR1_DXENA_OFF, //DXENA = 0 DX delay enabler off
MCBSP_SPCR1_ABIS_DISABLE, //reserbed always write 0
MCBSP_SPCR1_RINTM_RRDY, //RINTM = 00 when the RRDY bit change form 0 to 1,Int mode
MCBSP_SPCR1_RSYNCERR_NO, // RSYNCERR = 0 receibe frame-sync error bit, no error
MCBSP_SPCR1_RRST_DISABLE //RRST = 0 reset the receiver
//注意开始一定要设置为 disable 否则不能设置它的寄存器，导致不能正常工作，在 mcbspstart时会在设为1 McBSP 便开始工作
),
MCBSP_SPCR2_RMK(
MCBSP_SPCR2_FREE_NO, //FREE = 0
MCBSP_SPCR2_SOFT_NO, //SOFT = 0
MCBSP_SPCR2_FRST_RESET, //FRST = 0 SPG reset
MCBSP_SPCR2_GRST_RESET, // GRST = 0 SPG reset
MCBSP_SPCR2_XINTM_XRDY, //XINTM = 0 transmit interrupt mode, XRDY bit change form 0 to 1
MCBSP_SPCR2_XSYNCERR_NO, //XSYNCER = 0 transmit frame-sync error bit, no error
MCBSP_SPCR2_XRST_DISABLE // XRST = 0, reset the transmitter
),
MCBSP_RCR1_RMK(
MCBSP_RCR1_RFRLEN1_OF(0), // RFRLEN1 = 0 receive fram length 1
MCBSP_RCR1_RWDLEN1_8BIT // RWDLEN1 = 0 8bit receive word length 1
),
MCBSP_RCR2_RMK(
MCBSP_RCR2_RPHASE_SINGLE, //RPHASE = 0 single-phase frame
MCBSP_RCR2_RFRLEN2_OF(0), //RFRLEN2 = 0
MCBSP_RCR2_RWDLEN2_8BIT, //RWDLEN2 = 0
MCBSP_RCR2_RCOMPAND_MSB, //RCOMPAND = 0 receibe companding mode, 0:no companding, MSB received first
MCBSP_RCR2_RFIG_NO, //RFIG = 1 frame-sync ignore bit ,1: ignore
MCBSP_RCR2_RDATDLY_1BIT //RDATDLY = 01 receive 1-bit data delay
),
MCBSP_XCR1_DEFAULT, //
MCBSP_XCR2_DEFAULT, //
MCBSP_SRGR1_RMK(
MCBSP_SRGR1_FWID_OF(0), //FWID = 0
MCBSP_SRGR1_CLKGDV_OF(0) //CLKGDV = 0
),
MCBSP_SRGR2_RMK(
MCBSP_SRGR2_GSYNC_FREE, // GSYNC = 0 5502 always write 0
MCBSP_SRGR2_CLKSP_RISING, //CLKSP = 0 5502 don't have the CLKS pin set 0 always rsing edge igern the CLKRP and CLKXP
MCBSP_SRGR2_CLKSM_CLKS, //CLKSM = 0 work with the CLKME bit inPCR
MCBSP_SRGR2_FSGM_DXR2XSR, //FSGM = 0
MCBSP_SRGR2_FPER_OF(0) // FPER = 0
),
MCBSP_MCR1_DEFAULT,
MCBSP_MCR2_DEFAULT,
MCBSP_PCR_RMK(
MCBSP_PCR_XIOEN_SP, //XIOEN = 0
MCBSP_PCR_RIOEN_SP, //RIOEN = 0
MCBSP_PCR_FSXM_EXTERNAL, //FSXM = 0
MCBSP_PCR_FSRM_EXTERNAL, //FSRM = 0
MCBSP_PCR_CLKXM_INPUT, //CLKXM = 0
MCBSP_PCR_CLKRM_INPUT, //CLKRM = 0
MCBSP_PCR_SCLKME_BCLK, //SCLKME = 1
MCBSP_PCR_DXSTAT_0, //DXSTAT = 0 , used noly the RIOEN bit = 1
MCBSP_PCR_FSXP_ACTIVEHIGH, //FSXP = 0
MCBSP_PCR_FSRP_ACTIVEHIGH, // FSRP = 0
MCBSP_PCR_CLKXP_RISING, //CLKXP = 0
MCBSP_PCR_CLKRP_FALLING //CLKRP = 0
),
MCBSP_RCERA_DEFAULT,
MCBSP_RCERB_DEFAULT,
MCBSP_RCERC_DEFAULT,
MCBSP_RCERD_DEFAULT,
MCBSP_RCERE_DEFAULT,
MCBSP_RCERF_DEFAULT,
MCBSP_RCERG_DEFAULT,
MCBSP_RCERH_DEFAULT,
MCBSP_XCERA_DEFAULT,
MCBSP_XCERB_DEFAULT,
MCBSP_XCERC_DEFAULT,
MCBSP_XCERD_DEFAULT,
MCBSP_XCERE_DEFAULT,
MCBSP_XCERF_DEFAULT,
MCBSP_XCERG_DEFAULT,
MCBSP_XCERH_DEFAULT
};
interrupt void readISR(void);
extern void VECSTART(void);//外部中断向量表
//使用的TI例程没有改动在/CCStudio_v3.3/examples/c5502/csl/mcbsp/mcbsp2目录下的vectors_mcbsp2.s55
//---------main routine---------
void main()
{
Uint16 i;
for (i = 0; i <= SIZE - 1; i++) {
readBuff[i] = 0x00;
}
CSL_init();
//Disable interrupt
IRQ_globalDisable();
//Open McBSP channel
hMcbsp = MCBSP_open(MCBSP_PORT1, MCBSP_OPEN_RESET);
/* Get EventId's associated with MCBSP Port 1 receive and transmit */
rcvEventID = MCBSP_getRcvEventId(hMcbsp);
IRQ_setVecs((Uint32)(&VECSTART));
/* Clear any pending receive or transmit interrupts */
IRQ_clear(rcvEventID);
IRQ_plug(rcvEventID, &readISR);
/* Write values from configuration structure to MCBSP control regs */
MCBSP_config(hMcbsp, &MCBSP_READONLY_Config_test);
/* Enable the MCBSP receive and transmit interrupts */
IRQ_enable(rcvEventID);
/* Enable MCBSP transmit and receive */
MCBSP_start(hMcbsp,
MCBSP_RCV_START ,
0);
IRQ_globalEnable();
while(1);
}
// ISR to receive data
interrupt void readISR(void)
{
readBuff[cnt] = MCBSP_read16(hMcbsp);
cnt++;
if (cnt == SIZE)
{
cnt = 0;
}
}

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DSP多通道缓冲串口介绍

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