參數(shù)資料
型號: EP9315-IBZ
廠商: Cirrus Logic Inc
文件頁數(shù): 84/106頁
文件大小: 0K
描述: IC ARM9 SOC ENH UNIV 352PBGA
標準包裝: 40
系列: EP9
核心處理器: ARM9
芯體尺寸: 16/32-位
速度: 200MHz
連通性: EBI/EMI,EIDE,以太網(wǎng),I²C,IrDA,鍵盤/觸摸屏,PCMCIA,SPI,UART/USART,USB
外圍設備: AC'97,DMA,I²S,LCD,LED,MaverickKey,POR,PWM,WDT
輸入/輸出數(shù): 16
程序存儲器類型: ROMless
RAM 容量: 32K x 8
電壓 - 電源 (Vcc/Vdd): 1.65 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x12b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 352-BGA
包裝: 托盤
配用: 598-1144-ND - KIT DEVELOPMENT EP9315 ARM9
其它名稱: 598-1263
DS785UM1
3-9
Copyright 2007 Cirrus Logic
MaverickCrunch Co-Processor
EP93xx User’s Guide
3
loop
cfmul32 c0, c0, c3
; c0 <= c0 * 5
cfsub32 c0, c0, c2
; c0 <= c0 - 1
cfcmp32 r15, c0, c1
; c0 < 10 ?
blt loop
;
yes
cfstr32 c0, [r0, #0x0]
;
no, store result
3.2.2 Example 2
The following function performs an FIR filter on the given input stream. The variable “data”
points to an array of floating point values to be filtered, “n” is the number of samples for which
the filter should be applied, “filter” is the FIR filter to be applied, and “m” is the number of taps
in the FIR filter. The “data” array must be “n + m - 1” samples in length, and “n” samples will
be produced.
3.2.2.1 C Code
void
ComputeFIR(float *data, int n, float *filter, int m)
{
int i, j;
float sum;
for(i = 0; i < n; i++)
{
sum = 0;
for(j = 0; j < m; j++)
{
sum += data[i + j] * filter[j];
}
data[i] = sum;
}
3.2.2.2 MaverickCrunch Assembly Language Instructions
ComputeFIR
mov
r1, r1, lsl #2
; n *= 4
mov
r3, r3, lsl #2
; m *= 4
outer_loop
mov
r12, r3
; j = m * 4
cfsub64 c0, c0, c0
; int_sum = 0;
cfcvt32s c0, c0
; sum = float(int_sum);
inner_loop
cfldrs
c2, [r0], #4
; c2 = *data++;
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