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MC33PT2000控制主要功能函数代码详解三

news 2025/10/14 11:49:11

11、void download_register(int r_target)

11.1、源代码

用途：通过spi写入寄存器（如main、io、channel、diag寄存器）

/////////////////////////////////////////////////////////////////////////////////////////////////
// Function name   : download_register
// Description     : Downloads register configurations via SPI.
// Return type     : void
// Argument        : int r_target
/////////////////////////////////////////////////////////////////////////////////////////////////
void download_register(int r_target)
{int n = 0;                           // used for loop for writing data to the chipunsigned short r_start_address = 0;  // start addressunsigned short r_size = 0;           // size of configuration dataunsigned short r_command = 0;        // command dataunsigned short r_data = 0;           // configuration dataunsigned short remainder_size = 0;   // remainder sizeunsigned short *reg_ptr = NULL;      // pointer to array of data to be sent to the chipswitch (r_target)                    // selects target{case CH1_REG:                                // channel 1 configurationsr_start_address = ch1_flash_enable;reg_ptr = PT2000_ch1_config;r_size = sizeof(PT2000_ch1_config) / 2;  // number of words to be sentbreak;case CH2_REG:                                // channel 2 configurationsr_start_address = ch2_flash_enable;reg_ptr = PT2000_ch2_config;r_size = sizeof(PT2000_ch2_config) / 2;  // number of words to be sentbreak;case CH3_REG:                                // channel 3 configurationsr_start_address = ch3_flash_enable;reg_ptr = PT2000_ch3_config;r_size = sizeof(PT2000_ch3_config) / 2;  // number of words to be sentbreak;case DIAG_REG:                               // diagnostic configurationsr_start_address = diag_ls1_diag_config1;reg_ptr = PT2000_diag_config;r_size = sizeof(PT2000_diag_config) / 2; // number of words to be sentbreak;case IO_REG:                                 // IO configurationsr_start_address = io_fbk_sens_uc0_ch1_part1;reg_ptr = PT2000_io_config;r_size = sizeof(PT2000_io_config) / 2;   // number of words to be sentbreak;case MAIN_REG:                               // main configurationsr_start_address = main_Clock_Prescaler;reg_ptr = PT2000_main_config;r_size = sizeof(PT2000_main_config) / 2; // number of words to be sentbreak;default:break;}// Select common page memory areasend_single_PT2000_SPI_Cmd(WRITE, selection_register, 0x0100);// Set the maximum watchdog timeoutsend_single_PT2000_SPI_Cmd(WRITE, main_SPI_config, 0x1F);do{// If the size of the transfer is greater than the maximum SPI burst// transfer size, set the size to the maximum SPI burst size and store// the remainder size for use in the next SPI transferif (r_size > MAX_SPI_MODE_A_TRANSFER_SIZE){remainder_size = r_size - MAX_SPI_MODE_A_TRANSFER_SIZE;r_size = MAX_SPI_MODE_A_TRANSFER_SIZE;}else{// The size is <= MAX_SPI_MODE_A_TRANSFER_SIZE// so there is no remaining data to be sentremainder_size = 0;}// Build the control word to be sentr_command = r_start_address << 5;r_command += r_size;// Write a control word indicating the address and the number of words to be sentsend_16bit_SPI(r_command);for (n = 0; n < r_size; n++){// If this is the first register for ch1, ch2, or ch3 send 0 so the flash and dual// microcores are not enabledif( (n == 0) && ((r_target == CH1_REG) || (r_target == CH2_REG) || (r_target == CH3_REG)) ){r_data = 0;}else{r_data = *reg_ptr;          // set data to be sent}send_16bit_SPI(r_data);         // send datareg_ptr++;                      // update data pointer}r_start_address += r_size;         // update the start addressr_size = remainder_size;           // set size to the remaining amount of data} while (remainder_size > 0);// For channels 1, 2, & 3 program the flash enable register using the the// first entry in the channel's configuration tableswitch (r_target){case CH1_REG:// Program the ch1 flash enable registersend_single_PT2000_SPI_Cmd(WRITE, ch1_flash_enable, PT2000_ch1_config[0]);break;case CH2_REG:// Program the ch2 flash enable registersend_single_PT2000_SPI_Cmd(WRITE, ch2_flash_enable, PT2000_ch2_config[0]);break;case CH3_REG:// Program the ch3 flash enable registersend_single_PT2000_SPI_Cmd(WRITE, ch3_flash_enable, PT2000_ch3_config[0]);break;default:break;}} // end download_register

11.2、代码解析

1）int n = 0; 

定义for循环的n变量，初始化值为0

2）unsigned short r_start_address = 0;

定义寄存器的起始地址，初始化值为0

3）unsigned short r_size = 0;

定义寄存器的长度（即数量），初始化值为0

4）unsigned short r_command = 0;

定义数据命令还是指令命令，初始化值为0（表示数据命令）

5）unsigned short r_data = 0;

定义缓存要发的数据变量

6）unsigned short remainder_size = 0;

定义还剩未发的数据的数量

7）unsigned short *reg_ptr = NULL;

定义数据块指针，指向要发的数据块

8）switch (r_target)

选择开关，可选择CH1_REG、CH2_REG、CH3_REG、DIAG_REG、IO_REG及MAIN_REG

9）case CH1_REG:  r_start_address = ch1_flash_enable;reg_ptr = PT2000_ch1_config;

r_size = sizeof(PT2000_ch1_config) / 2;break;

设置channel1寄存器的起始地址、要写的寄存器配置表、寄存器的长度。

各参数如下：

#define ch1_flash_enable 0x100

数据表可到PT2000_LoadData.c文件里寻找

10）case CH2_REG:  r_start_address = ch2_flash_enable;reg_ptr = PT2000_ch2_config;

r_size = sizeof(PT2000_ch2_config) / 2;break;

类似于9）

11）case CH3_REG:  r_start_address = ch3_flash_enable;reg_ptr = PT2000_ch3_config;

r_size = sizeof(PT2000_ch3_config) / 2;break;

类似于9）

12）case DIAG_REG:  r_start_address = diag_ls1_diag_config1;reg_ptr = PT2000_diag_config;r_size = sizeof(PT2000_diag_config) / 2;break;

设置diag寄存器的起始地址、要写的寄存器配置表、寄存器的长度。

各参数如下：

#define diag_ls1_diag_config1 0x1C0

数据表可到PT2000_LoadData.c文件里寻找

13）case IO_REG:  r_start_address = io_fbk_sens_uc0_ch1_part1;reg_ptr = PT2000_io_config;r_size = sizeof(PT2000_io_config) / 2;break;

设置io寄存器的起始地址、要写的寄存器配置表、寄存器的长度。

各参数如下：

#define io_fbk_sens_uc0_ch1_part1 0x154

数据表可到PT2000_LoadData.c文件里寻找

14）case MAIN_REG:  r_start_address = main_Clock_Prescaler;reg_ptr = PT2000_main_config;r_size = sizeof(PT2000_main_config) / 2;break;

设置main寄存器的起始地址、要写的寄存器配置表、寄存器的长度。

各参数如下：

#define main_Clock_Prescaler 0x1A0

数据表可到PT2000_LoadData.c文件里寻找

15）default: break;

如不在开关选择范围直接退出开关选择。

16）send_single_PT2000_SPI_Cmd(WRITE, selection_register, 0x0100);

        向0x3FF寄存器写入0x100（即向下图的bit8写入1），即为选择公共页（即寄存器页，包含main、io、channel、diag等寄存器）

#define selection_register 0x3FF

16）send_single_PT2000_SPI_Cmd(WRITE, main_SPI_config, 0x1F);

向0x1A9寄存器写入0x1F，即设置watchdog参数

#define main_SPI_config 0x1A9

watchdog计算过程如下

tWATCHDOG = tCKSYS * ((watchdog + 1) x 32768)  = 1/24MHz x((0x1F+1)x32768)  = 43.69ms

17）do{.....}

执行写入除CH1_REG/CH2_REG/CH3_REG寄存器外，即写入MAIN/IO/DIAG寄存器

18）switch (r_target) { ....}

通过SPI写入CH1_REG/CH2_REG/CH3_REG寄存器

12、void download_RAM(int target)

12.1、源代码

用途：通过spi写入数据到代码RAM和数据RAM里

/////////////////////////////////////////////////////////////////////////////////////////////////
// Function name   : download_RAM
// Description     : Downloads code RAM or data RAM via SPI.
// Return type     : void
// Argument        : int target
/////////////////////////////////////////////////////////////////////////////////////////////////
void download_RAM(int target)
{unsigned short memory_area = 0;        // memory areaunsigned short start_address = 0;      // start addressunsigned short codeWidthRegAddr = 0;   // code width register addressunsigned short size = 0;               // size of RAM dataunsigned short command = 0;            // command dataunsigned short data = 0;               // RAM dataunsigned int k = 0;                    // used in loop for writing RAM data to the chipunsigned short * RAM_ptr = NULL;       // pointer to array of data to be sent to the chip// Select common page memory areasend_single_PT2000_SPI_Cmd(WRITE, selection_register, 0x0100);// Set the maximum watchdog timeoutsend_single_PT2000_SPI_Cmd(WRITE, main_SPI_config, 0x1F);// Select targetswitch (target){case CODE_RAM1:memory_area = 0x1;start_address = 0;codeWidthRegAddr = ch1_code_width;RAM_ptr = PT2000_code_RAM1;size = sizeof(PT2000_code_RAM1) / 2;   // gets number of words to be sentbreak;case CODE_RAM2:memory_area = 0x2;start_address = 0;codeWidthRegAddr = ch2_code_width;RAM_ptr = PT2000_code_RAM2;size = sizeof(PT2000_code_RAM2) / 2;   // gets number of words to be sentbreak;case CODE_RAM3:memory_area = 0x4;start_address = 0;codeWidthRegAddr = ch3_code_width;RAM_ptr = PT2000_code_RAM3;size = sizeof(PT2000_code_RAM3) / 2;   // gets number of words to be sentbreak;case DATA_RAM:memory_area = 0x0100;start_address = 0;RAM_ptr = PT2000_data_RAM;size = sizeof(PT2000_data_RAM) / 2;    // gets number of words to be sentbreak;default:break;}// Set the code width register only if code RAM is being downloadedif (target != DATA_RAM){// Set the code width register with the size of the downloadsend_single_PT2000_SPI_Cmd(WRITE, codeWidthRegAddr, size);}// Send command for memory area selectionsend_single_PT2000_SPI_Cmd(WRITE, selection_register, memory_area);command = start_address << 5;send_16bit_SPI(command);              // sends start address commandfor (k = 0; k < size; k++)            // downloads RAM{data = *RAM_ptr;                  // retrieves data to be sentsend_16bit_SPI(data);             // sends dataRAM_ptr++;}
} //end download_RAM

12.2、代码解析

1）unsigned short memory_area = 0;

定义内存的长度变量

2）unsigned short start_address = 0;

定义内存的起始地址变量

3）unsigned short codeWidthRegAddr = 0;

定义代码的长度变量

4）unsigned short size = 0;

定义RAM的长度变量

5）unsigned short command = 0;

定义数据指令还是命令指令

6）unsigned short data = 0;

定义数据的缓存变量

7）定义for循环的变量

unsigned int k = 0;

8）unsigned short * RAM_ptr = NULL;

定义要发送数据的指针，指向要发送的数据块

9）send_single_PT2000_SPI_Cmd(WRITE, selection_register, 0x0100);

 向0x3FF寄存器写入0x100（即向下图的bit8写入1），即为选择公共页（即寄存器页，包含main、io、channel、diag等寄存器）

#define selection_register 0x3FF

10）send_single_PT2000_SPI_Cmd(WRITE, main_SPI_config, 0x1F);

向0x1A9寄存器写入0x1F，即设置watchdog参数

#define main_SPI_config 0x1A9

11）switch (target)

开关选择code RAM1/2/3或data RAM

12）case CODE_RAM1: memory_area = 0x1;start_address = 0;codeWidthRegAddr = ch1_code_width;RAM_ptr = PT2000_code_RAM1;size = sizeof(PT2000_code_RAM1) / 2;break;

设置code ram1的内存区域、起始地址、代码长度、代码数据块的指针、数据长度等

参数可在以下获取

#define ch1_code_width 0x107

13）case CODE_RAM2: memory_area = 0x2;start_address = 0;codeWidthRegAddr = ch2_code_width;RAM_ptr = PT2000_code_RAM2;size = sizeof(PT2000_code_RAM2) / 2;break;

类似于12）

14）case CODE_RAM3: memory_area = 0x3;start_address = 0;codeWidthRegAddr = ch3_code_width;RAM_ptr = PT2000_code_RAM3;size = sizeof(PT2000_code_RAM3) / 2;break;

类似于12）

15）case DATA_RAM:start_address = 0;memory_area = 0x0100;RAM_ptr = PT2000_data_RAM;size = sizeof(PT2000_data_RAM) / 2;break;

16）default:break;

如果不在开关选择范围内，直接退出

17）if (target != DATA_RAM) {send_single_PT2000_SPI_Cmd(WRITE, codeWidthRegAddr, size);}

如果发送的数据code RAM数据，那么将代码长度size写入0x107（如是channel1）寄存器

#define ch1_code_width 0x107

18）send_single_PT2000_SPI_Cmd(WRITE, selection_register, memory_area);

选择内存区域。

如memory_area = 0x1表示选中CRAM 1

如memory_area = 0x2表示选中CRAM 2

如memory_area = 0x4表示选中CRAM 3

如memory_area = 0x100表示选中DRAM

#define selection_register 0x3FF

19）command = start_address << 5;for (k = 0; k < size; k++) {data = *RAM_ptr; 

send_16bit_SPI(data); RAM_ptr++;}

写入数据到CRAM或DRAM

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